JPH04156895A - Drum type washing machine - Google Patents

Abstract

PURPOSE:To sharply reduce the vibration quantity transferred to a washing machine main body and the floor face by providing a damper suppressing the vibration of a water tub, setting the damping force of the damper small at the preset stroke or below, and setting it large at the preset stroke or above. CONSTITUTION:In a drum type washing machine washing and centrifugally dehydrating the laundry with a drum 15 rotated around a horizontal shaft 16, a damper 21 connecting a water tub 14 and a main body 12 is provided to damp the vibration during dehydration, the damping force is set small at the preset stroke or below, and it is set large at the preset stroke or above. Since the damper 21 with the stroke-dependent damping force is used, the damping force of the damper 21 is increased when the rotating speed during dehydration passes the resonant rotating speed of a water tub system with a spring and the damper 21 because the resonant vibration of the water tub is large, and the damper 21 functions to reduce the resonant vibration to the preset value or below. The vibration transferred to the drum type washing machine main body and the floor face via the damper 21 during dehydration rotation can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention 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. It is intended to reduce

2. Description of the Related Art A conventional drum type washing machine has a structure as shown in FIG. In the figure, 1 is a drum, and a large number of water passage holes 1a are provided on the outer periphery. 2 is a water tank that houses the drum 1 and stores washing water. 3 is a motor 6 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 belt connecting the motor 3 and the drum pulley 5. be. 7 operates the water tank 2 with the above-mentioned configuration as follows. During the washing process, the drum 1 is driven to rotate at a low speed by the motor 3, and the laundry in the drum 1 is repeatedly lifted and dropped. This mechanical force advances the washing process. During the rinsing process, operations similar to those in the washing process are performed, and the rinsing process progresses. During the dewatering process, the drum 1 is rotated at high speed to dehydrate the clothes. At this time, if the clothes are skewed or unbalanced in the tram 1, vibrations occur in the tram 1 and the water tank 2. Since the weight 10 increases the weight of the vibrating body, this vibration has a smaller amplitude than when no weight is provided.

Problems to be Solved by the Invention Even in the conventional drum-type washing machine described above, the water tank vibrates greatly during spin-drying, depending on how the clothes are unevenly distributed in the drum. The vibrations of this water tank are transmitted to the main unit via springs and dampers, and even to the floor on which the washing machine is placed. This causes the floor surface to vibrate greatly, causing the entire house to vibrate in wooden houses (.

Therefore, the first object of the present invention is to reduce the vibrations transmitted to the main body of the drum-type washing machine and the floor via the damper by using a damper whose damping force depends on the stroke.

The second purpose is to use a damper whose damping force depends on the stroke speed to reduce vibrations transmitted to the main body of the drum-type washing machine and the floor through the damper during spin-drying rotation.

Means for Solving the Problems The first means of the present invention for achieving the first object is to provide a main body, a drum having water passage holes on its outer periphery, a water tank containing the drum and storing washing water, A horizontal shaft having one end fixed to the center of rotation of the drum, penetrating the water tank and driven by a motor via a hematode, a spring for holding the main body of the water tank, and a damper for suppressing vibration of the water tank. Set the buffering force to the specified stroke 1! The bottom is small;
The predetermined stroke is enlarged.

Further, a second means of the present invention for achieving the second object includes a main body, a drum having water passage holes on the outer periphery, a water tank containing the drum and storing washing water, and one end of which is connected to the rotation of the drum. A horizontal shaft fixed at the center and driven by a motor via a belt that passes through the water tank, a spring that holds the main body of the water tank, and a damper that suppresses vibration of the water tank, and the damper has a predetermined setting for the damping force. The stroke speed below is large, and the stroke speed above a predetermined stroke speed is small.

The first means of the present invention uses a damper whose buffering force depends on the stroke, so that when the rotational speed during dewatering passes the resonance rotational speed of the aquarium system having the spring and the damper, the resonance of the aquarium is suppressed. Since the vibration is large, the damper has a large buffering force, which acts to reduce the resonance vibration below a predetermined value.

In addition, since the vibration of the water tank is small during steady rotation of spin-drying, the damper's buffering force is small, and the vibration during spin-dry rotation acts to reduce the vibration transmitted to the drum-type washing machine main body and floor surface via the damper.

The second means of the present invention is to use a damper whose buffering force depends on the stroke, so that when the rotation speed during dewatering passes the resonance rotation speed of the water tank system having the spring and the damper, the stroke speed of the damper is reduced. Since it is small, the damper has a large buffering force, which acts to reduce the resonance vibration below a predetermined value. In addition, since the stroke speed of the damper is high during steady rotation of spin-drying, the damper's buffering force is small, which acts to reduce the vibrations transmitted to the drum-type washing machine body and floor through the damper during spin-dry rotation. .

Embodiment Hereinafter, one embodiment of the present invention will be described based on the accompanying drawings. In Fig. 1, 12 is the main body, 13 is a clothes loading lid that can be opened and closed on the front of the main body, 14 is a water tank that houses a drum and stores washing water, 15 is a water tank installed inside the water tank 14, and water is passed around the outer periphery. A drum having a hole 15a, 16 a horizontal shaft passing through the water tank 14 and having one end fixed at the center of rotation of the tram 15, 17
1 is a drum pulley provided at the other end of the horizontal shaft 16, 18 is a motor that drives the drum pulley 17, and 19 is a belt that connects the motor 18 and the drum pulley 17. 20 is a spring for suspending the water tank 14 from the main body 12; 21 is a damper provided by connecting the water tank 14 and the main body 12 to damp vibration; the damping force of the damper 21 is small below a predetermined stroke; The above is considered a large setting and is set to 2. FIG. 2 is a diagram illustrating details of this damper writhing. 22-a and 22-b are Dunbar Oka's aquarium mounting part and main body mounting part, respectively. 23 is a cylinder, and oil 24 is sealed inside. 25 is a rod;
26 is a piston having an orifice 27. The piston 26 slides on the inner surface of the cylinder 23, and also slides on the rod 25 by a predetermined stroke S from the center position 29 due to the action of an extremely weak correction spring 28.

With this configuration, the damper force is extremely small during the 6-stroke period, as it is only the force of the correction spring 28 due to the frictional force between the piston 26 and the rod 25, and when the stroke exceeds S, the piston 26 moves together with the rod 25, and the damper force is extremely small. 2
4 exerts a large damping force due to the resistance force when it passes through the orifice 27 of the piston 26. 30 is aquarium 1
4 is a weight for suppressing vibration, 31 is a heater for heating washing water, and 32 is a control device, which controls the motor 18, heater 31, and their parts.

Next, the operation in this embodiment will be explained. When washing starts, a predetermined amount of water is supplied to the water tank 14, and the heater 31 is energized until the water reaches a predetermined temperature.

At this time, the drum 15 is driven to rotate at a low speed by the motor 18, and the clothes in the drum 15 are lifted up and dropped, applying mechanical force to wash the clothes. After washing is completed, the washing water is drained, and rinsing is performed a predetermined number of times to complete the washing process. When the washing process is completed, the dehydration process begins. When dewatering starts, the tram 15 is driven to rotate at high speed by the motor 18, and the clothes are centrifugally dehydrated. When the dewatering rotation starts and the rotation speed of the tram 15 gradually increases and reaches the natural frequency of the water tank system determined by the spring 20 and the damper 21, a resonance state occurs and the water tank 14 vibrates with a large amplitude. That is, the stroke of the damper 21 becomes larger than S. At this time, the damper force becomes large, and it is possible to limit the vibration amplitude at the time of resonance, and it is possible to prevent the water tank 14 from interfering with the main body 12 or the main body from becoming thick (vibrating).Rotation of the drum 15 When the number of vibrations passes through the natural frequency of the water tank system and reaches the rotation speed during steady dehydration, the vibration amplitude of the water tank 14 becomes a constant value.In other words, the stroke of the damper 21 becomes smaller than S.At this time, the damper force is This makes it possible to significantly reduce vibrations transmitted from the water tank 14 to the floor surface via the damper 21.

Next, an embodiment of the second means of the present invention will be described based on FIGS. 3 and 4. A damper 33 is provided by connecting the water tank 14 and the main body 12 in order to damp vibrations. The damping force of the damper 33 is set to be large when the stroke speed is below a predetermined stroke speed, and small when the stroke speed is above a predetermined stroke speed. The detailed structure of this damper 33 is shown in FIG. In Figure 4, 34
-a and 35-b are a water tank attachment part and a main body attachment part of the damper 33, respectively. 35 is a cylinder, and oil 36 is sealed inside. 37 is a rod, 38
is a piston with an orifice 39. piston 3
The orifice 39 of No. 8 is provided with an orifice piston 41 biased in one direction by an orifice spring 40. With this configuration, when the stroke speed of the piston 38 is below a predetermined value, the pressure difference between the oil 36 on both sides of the piston 38 is small, and the orifice piston 41
is almost closed.

Therefore, the damper force at this time is extremely large. When the stroke speed is above a predetermined value, the piston 3
The pressure difference between the oil 36 on both sides of the valve 8 becomes large, the orifice piston 41 moves against the orifice spring 40, and the orifice 39 is almost in an open state. Therefore, the damper force becomes extremely small. Since the orifice pistons 41 are provided symmetrically on both sides of the piston 38, they are effective against the movement of the piston 38 in both directions.

The operation of this embodiment will be explained below. When the dewatering rotation is started and the rotation speed of the drum 15 gradually increases until it reaches the natural frequency of the aquarium system, it enters a resonance state and the aquarium 14 vibrates with a large amplitude. However, at this time, the number of rotations, that is, the rotational frequency is very low, so the piston 38 in the damper 33
The stroke speed will be small. Therefore, the damper force becomes large, and the vibration amplitude at the time of resonance can be limited, and it becomes possible to prevent the water tank 14 from interfering with the main body 12 and the main body from vibrating greatly. drum 15
When the rotational speed of the water tank 4 passes through the natural frequency of the aquarium system and reaches the steady state dehydration rotational speed, the vibration amplitude of the aquarium 4 becomes a constant value. In this state, the rotational speed is very high, the stroke speed of the piston 38 in the damper 33 becomes large, and the damper force becomes small. Therefore, in this state, it is possible to significantly reduce the amount of vibration of the water tank 4 transmitted to the floor surface via the damper 21.

Effects of the Invention As described above, according to the first means of the present invention, there is provided a main body, a drum provided with water passage holes on the outer periphery, a water tank accommodating the drum and storing washing water, and one end of which is connected to the rotation center of the drum. A horizontal shaft is fixed to the water tank and is driven by a motor via a belt that passes through the water tank, a spring holds the main body of the water tank, and a damper suppresses vibration of the water tank, and the damper has a damping force equal to or less than a predetermined stroke. By using a drum-type washing machine with a small stroke and a large stroke beyond a predetermined stroke, the amount of vibration transmitted to the tram-type washing machine body and floor through the damper can be significantly reduced. It is something that will come.

Furthermore, according to the second means of the present invention, there is provided a main body, a drano having a water passage hole on its outer periphery, a water tank containing a drum and storing washing water, and one end of which is fixed to the center of rotation of the drum. A horizontal axis driven by a motor through a belt passing through the water tank, a spring for holding the main body of the water tank, and a damper for suppressing vibration of the water tank, and the damper has a damping force that is lower than a predetermined stroke speed. By using a drum-type washing machine that has a large stroke speed and a low stroke speed above a predetermined stroke speed, the same effect as the first means can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a side cross-sectional view of a drum-type washing machine according to an embodiment of the first means of the present invention, FIG. 2 is a detailed view of the same main part, and FIG. FIG. 4 is a detailed view of the main parts of the drum-type washing machine, and FIG. 5 is a side sectional view of a conventional drum-type washing machine. 12... Main body, 14... Water tank, 15... Drum,
16...Horizontal axis, 20...Spring, 21/33
...damper. Name of agent: Patent attorney Haruaki Ogata and 2 others
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Claims (2)

[Claims] (1) A main body, a drum with water holes on the outer periphery, a water tank that houses the drum and stores washing water, one end of which is fixed to the center of rotation of the drum, passes through the water tank, and is driven by a motor via a belt. The drum-type washing machine is equipped with a horizontal axis that holds the main body of the water tank, a spring that holds the main body of the water tank, and a damper that suppresses the vibration of the water tank, and the damper's damping force is set to be small below a predetermined stroke and large above a predetermined stroke. Machine. (2) A main body, a drum with water holes on its outer periphery, a water tank that encloses the drum and stores washing water, and one end of which is fixed to the center of rotation of the drum, passes through the water tank, and is driven by a motor via a belt. The drum is equipped with a horizontal shaft that holds the main body of the water tank, a spring that holds the main body of the water tank, and a damper that suppresses vibration of the water tank, and the damper's damping force is set to be large at a predetermined stroke speed or less and small at a predetermined stroke speed or above. washing machine.