JPH0584387A - Drum type washing machine - Google Patents

Abstract

PURPOSE:To keep the vibration of a washing machine main body small and effectively reduce the vibration transmitted to the floor face. CONSTITUTION:A drum 23 having water flow holes 25 on the outer periphery and horizontally installed with a rotary shaft 26, a water tub 24 incorporating the drum 23 and storing washing water, springs 30 suspending the water tub 24 from the washing machine main body 22, a damper 31 suppressing the vibration of the water tub 24, and installation legs 34 arranged on the bottom face of the main body 22 are provided, the installation legs 34 are made vertically movable via dampers 35, and the vertical movement of the installation legs 34 is restricted by restricting devices 36. The installation legs 34 may be set to the vertically movable state or the restricted state by the switching of the restricting device 36 depending on the hardness of the floor face, or the drum rotating speed resonant with the floor face is detected by a floor vibration detector 37, the restricting device 36 is switched by the output of the floor vibration detector 37, and the installation legs 34 may be set to the vertically movable state or the restricted state.

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 storing laundry in a rotary driven drum for washing and centrifugal dewatering.

[0002]

2. Description of the Related Art FIG. 7 is a vertical sectional view showing the structure of a conventional drum type washing machine. In FIG. 7, a drum 1 which stores and rotates laundry is provided with a large number of water passage holes 2 on its outer peripheral portion. A water tub 3 is provided to enclose the drum 1 and the washing water is stored in the water tub 3. A horizontal rotation shaft 4 is provided which penetrates the center of the water tank 3 and has one end fixed to the rotation center of the drum 1, and a drum pulley 5 is fixedly provided at the other end. A drum driving motor 6 is provided below the water tank 3, and a rotation shaft of the motor 6 and the drum pulley 5 are connected by a belt 7. The water tub 3, the rotary shaft 4, the drum pulley 5, the motor 6 and the like are housed in the washing machine body 8, and the water tub 3 is hung from the washing machine body 8 by the spring 9.
The damper 10 provided between the lower portion of the water tub 3 and the bottom surface of the washing machine body 8 holds the water tub 3 to damp vibrations. Furthermore, a weight 11 is provided on the front wall of the water tank 3 to reduce vibration during dehydration. Furthermore, a plurality of installation feet 12 are provided on the bottom surface of the washing machine body 8, and the installation feet 12 support the washing machine body 8.

With the above construction, during the washing process, the drum 1 is driven to rotate at a low speed by the motor 6 via the belt 7, the drum pulley 5 and the rotary shaft 4, and the laundry contained in the drum 1 is lifted and dropped. Washing is performed by this mechanical force. Then, in the subsequent rinsing step, the same process as in the washing step is performed, and in the dehydration step, the drum 1 is used.
Spin the clothes at high speed to centrifugally dehydrate the clothes. At this time, if an imbalance occurs due to the deviation of the clothes in the drum 1, the drum 1 and the water tank 3 vibrate, but the weight 11 increases the weight of the vibrating body. Vibration amplitude is reduced.

[0004]

In the above conventional drum type washing machine, since the drum 1 rotates about the horizontal axis, the water tub 3 vibrates greatly during the washing process and the dehydrating process. In particular,
When the clothes in the drum 1 are biased during the dehydration process, the water tub 3 vibrates greatly, and the vibration of the water tub 3 is transmitted to the washing machine body 8 holding the water tub 3 via the spring 9 and the damper 10, This vibration is also transmitted to the floor surface where the washing machine is installed via the installation feet 12. At this time, the floor where the washing machine is installed varies from hard to very soft, and especially on a weak floor such as a wooden house, the floor vibrates greatly, and at worst The whole starts to vibrate, and the user feels uncomfortable, which is a big problem in terms of noise. Further, generally, the vibration transmitted to the floor surface can be reduced by using a soft material for the installation foot 12, but in this case, when the water tank 3 vibrates greatly, the washing machine body 8 also vibrates greatly, and when it is installed in a system kitchen or the like. When the dimensional allowance is extremely small as described above, there is a problem that vibration causes the washing machine body 8 to hit a peripheral side wall and generate noise, which causes a problem.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a drum type washing machine capable of keeping the vibration of the main body of the washing machine small and reducing the vibration transmitted to the floor surface. To do.

[0006]

In order to solve the above-mentioned problems, a drum type washing machine of the present invention includes a drum for accommodating and rotating laundry, a water tank for accommodating the drum and storing washing water, and An installation foot that is provided on the bottom surface of the washing machine body that accommodates the water tub, supports the washing machine body, and is vertically movable via a cushioning body, and a restraint unit that restrains the movement of the installation foot in the up and down direction. It is equipped with.

In the drum type washing machine of the present invention, in addition to the above-mentioned first structure, the installation foot is restrained by the restraining means up to the drum rotation speed at which the floor surface resonates at the start of the dehydration step, The control means is provided for releasing the restraint state by the restraint means at a rotational speed of the drum at which the surface resonates or more, and controlling the installation foot to be freely movable in the vertical direction.

Further, the drum type washing machine of the present invention is, in addition to the above-mentioned first construction, restrained up to a vibration detecting means for detecting the magnitude of vibration of the washing machine body and a predetermined vibration detected by the vibration detecting means. The restraint state by the means is released to allow the installation foot to move freely in the up-and-down direction, and when the vibration detection means detects a predetermined vibration or more, the restraint means places the installed foot in the restrained state. And control means for controlling.

[0009]

With the above construction, when the restraining means is operated, the installation foot is fixed in the vertical direction, and the washing machine body can be rigidly placed on the floor surface. Further, when the restraining means is released, the washing machine body is placed on the floor. It will be installed via the cushion of the installation foot to the surface. Vibrations transmitted to the floor will be reduced if the installation feet are softened.However, if the floor is a hard floor such as concrete, the vibration of the main body of the washing machine will be large. To keep the installation foot in a restrained state, the vibration of the washing machine body is kept small, and when the floor surface is soft, the restraint means is opened to allow the installation foot to move vertically. By doing so, the vibration transmitted to the floor surface is reduced.

Further, since the control means keeps the installation foot restrained up to the drum rotation speed at which the floor resonates at the start of the dehydration process, and then moves freely up and down.
During low-frequency resonance up to the drum speed at which the floor resonates, which is determined by the weight of the aquarium, the feet are restrained to prevent excessive vibration of the main body of the washing machine. It can be installed without any problem. Further, during resonance of a high frequency with the floor surface and during dehydration steady rotation, the vibrations transmitted to the floor surface are greatly reduced by setting the installation foot in a soft state in which it can freely move in the vertical direction via the cushioning body.

Further, when the vibration detecting means detects a predetermined vibration or more, the control means holds the installed foot in a restrained state, so that when the clothes are largely biased in the drum during washing, rinsing, dehydration, etc. Excessive vibration of the machine body is prevented, and problems such as large noise generated by interference with the side wall of the kitchen are eliminated when the built-in system is installed in the system kitchen. Also, when the vibration of the washing machine body is small, such as when the unevenness of the clothes in the drum is small, the vibration transmitted to the floor is greatly reduced by making the installation foot vertically movable by the control means. ..

[0012]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a vertical sectional view showing the structure of a drum type washing machine according to an embodiment of the present invention. In FIG.
The clothes loading lid 21 is provided at the center of the front surface of the washing machine main body 22 so as to be openable and closable. The clothes loading lid 21 accommodates laundry in the drum 23 and rotates the drum 23 for washing. Aquarium
The drum 24 contains the drum 23 to store the washing water. A water passage hole 25 is provided on the outer peripheral portion of the drum 23, and a rotary shaft 26 is horizontally provided. The rotary shaft 26 penetrates the water tank 24 and has one end fixed to the center of rotation of the drum 23, and the other end of the rotary shaft 26 is provided with a drum pulley 27. The drum pulley 27 and a rotation shaft of a motor 28 provided below the water tank 24 are connected by a belt 29, and the belt 29 is driven by the motor 28.
The configuration is such that the drum 23 is driven to rotate via the drum pulley 27 and the rotation shaft 26.

Further, the spring 30 is provided for the water tank 24 and the washing machine main body.
Suspended from the top of 22. Also, the damper 31 is a tank
It is provided so as to be connected between the lower part of 24 and the bottom surface of the washing machine body 22 to damp the vibration of the water tank 24. More springs 30
The damper 31 holds the water tank 24 in the main body 22 of the washing machine so as to suppress the vibration. Also, the aquarium
A weight 32 is provided on the front of the water tank 23 to suppress the vibration of the water tank 24, and a heater 33 for heating the wash water is provided on the bottom of the water tank 24.
Is provided to bring the temperature of the washing water to a predetermined temperature. further,
On the bottom surface of the washing machine main body 22, installation feet 34 that support the washing machine main body 22
Are provided in plurality, and these installation feet 34 are configured to be movable in the vertical direction via a buffer 35. Also, install feet
The solenoid 36 is provided on the 34, and the solenoid 36 is driven to restrain the vertical movement of the installation foot 34. The floor vibration detector 37 is provided on the bottom surface of the washing machine body 22 and detects the vibration of the floor surface. The control device 38 controls the solenoid 36 in accordance with the output of the floor vibration detector 37 to set the installation foot 34 in a vertically movable state or in a restrained state.

FIG. 2 is a vertical sectional view showing the details of the installation foot 34 in FIG. In FIG. 2, the ground portion 39 is in contact with the floor surface, and the rod 40 projects upward from the center of the ground portion 39.
Is provided, and a notch 40a is provided on the outer peripheral portion of the rod 40. Sliding part where rod 40 slides vertically
41 is fixed on the bottom surface of the main body 22 of the washing machine. Buffer 35
Is provided between the bottom surface of the washing machine main body 22 and the ground portion 39 and is made of a material such as butyl rubber and has a damping characteristic. The solenoid 36 has a pin 42 that can be fitted into the notch 40a. By removing the pin 42 that fits into the notch 40a, the installation foot 34 can be released from the restrained state and moved vertically. It is a configuration that does.

In this case, when the solenoid 36 is off, the grounding portion 39 is vertically restrained, and when the solenoid 36 is on, it is free to move vertically. The pin 42 and the solenoid 36 constitute a restraint device 43 for the installation foot 34, and the grounding portion 39, the rod 40, the sliding portion 41, the shock absorber 35, and the restraint device 43 constitute the installation foot 34.

The operation of the above arrangement will be described below. First, when washing is started, a predetermined amount of water is supplied to the water tank 24 and the heater 33 is energized until it reaches a predetermined temperature. At this time, the drum 23 is driven to rotate at a low speed by the motor 28, the clothes in the drum 23 are lifted and dropped, and mechanical force is applied to wash the clothes. Then, after the washing is completed, the washing water is drained and the rinsing step is finished by rinsing a predetermined number of times. Further, in the dehydration process, the drum 23 is driven to rotate at a high speed by the motor 28 to centrifugally dehydrate the clothes.

Here, in these washing processes, generally, if the installation feet 34 are softened, the vibration transmitted to the floor surface can be reduced. However, if the floor surface is a hard floor surface such as concrete, by softening the installation feet 34,
On the contrary, the vibration of the washing machine itself increases. Therefore, according to the installation foot 34 of the present embodiment, when the washing machine is installed on a hard floor, the pin 42 of the solenoid 36 is cut out of the rod 40.
It is used in a state of being fitted to 40a, that is, in a state where the installation foot 34 is vertically restrained. In addition, when installed on a soft floor such as a wooden house, the pin 42 of the solenoid 36 is not fitted in the notch 40a of the rod 40, that is, the installation foot 34 is vertically movable. By using it, the vibration of the washing machine main body 22 can be kept small regardless of the state of the floor surface, and the vibration transmitted to the floor surface can be reduced.

Further, as described above, in addition to the case where the solenoid 36 is switched according to the hardness of the floor surface to set the installation foot 34 in a vertically movable state or in a restrained state, the floor surface resonates. The operation of switching the solenoid 36 according to the number of rotations of the drum to set the installation foot 34 in a vertically movable state or in a restrained state will be described below with reference to the flowchart of FIG. 3 and the block diagram of FIG. .. First, when washing is started, the washing step of step S1 and the rinsing step of step S2 are finished, the dehydration step is started, and the solenoid 36 is turned off in step S3, that is, the installation foot 34 is held in a restrained state. To operate. In the initial stage of this dehydration process, when the rotation speed of the drum 23 gradually increases, the weight of the water tank 24, the rotation speed at which the water tank 24 at 300 rpm determined by the spring 30 and the damper 31 resonates, and the weight of the washing machine. Then, the rotation speed at which the floor resonates at about 800 rpm, which is determined by the hardness of the installation foot 34 and the hardness of the floor, passes. Here, when the water tub 24 passes through a resonating number of revolutions, the vibration of the water tub 24 becomes large, and therefore the vibration of the washing machine main body 22 in the left-right direction becomes large.
By binding 34 vertically, the washing machine body
It is possible to suppress excessive vibration in the left-right direction of 22, and this makes it possible to install the system kitchen without problems even if it is built-in.

Thereafter, when the number of rotations of the drum 23 is increasing, the floor vibration detector 37 detects the vertical vibration of the bottom surface of the washing machine main body 22 to detect the vertical vibration of the floor vibration, that is, the floor vibration. The resonance state of the surface can be detected. As a result, in step S4, it is determined whether or not the floor rotation speed is lower than the floor rotation speed by a predetermined speed.
In step S5, the solenoid 36 is turned on so that the installation foot 34 can move freely in the vertical direction. Therefore, with respect to the output of the floor vibration detector 37, the control device 38 resonates the floor by allowing the installation foot 34 to move freely in the vertical direction before reaching the peak of the number of rotations at which the floor resonates. With the number of rotations, the vibration force transmitted to the floor can be reduced, and the vibration of the floor surface can be greatly reduced.
22 excessive vibration can also be prevented.

Further, it is judged in step S6 that the dehydration is completed. If the dehydration is completed, the motor 28 is operated in step S7.
After that, it is determined in step S8 whether or not the floor rotation speed is lower than the predetermined floor rotation speed by a predetermined value. If it is not lower, the determination in step S8 is repeated until it becomes lower. In step S9, the solenoid 36
Is turned off and the installation foot 34 is restrained in the vertical direction, and the dehydration process is completed.

In this embodiment, the floor vibration detector 37 is used to detect the resonance speed of the floor surface, but the invention is not limited to this, and the control is performed according to the time from the start of the spin rotation. You can go, and the point is to install it by the resonance speed of the floor.
Can be controlled.

FIG. 5 is a vertical sectional view showing the structure of a drum type washing machine according to another embodiment of the present invention, and FIG. 6 is a block diagram of a control unit in the drum type washing machine of FIG. It should be noted that parts having the same effects as those of the embodiment of FIG. 1 are designated by the same reference numerals and the description thereof will be omitted. In FIG. 5 and FIG. 6, the installation foot 34 is provided on the bottom surface of the washing machine main body 22 and can be set in a vertically movable state or in a restrained state. The control device 52 is configured to detect the magnitude and control the motor 28, the heater 33, the solenoid 36, and the like by using the output of the vibration detection device 51 as an input.

With the above configuration, the operation will be described below. During the washing, rinsing, and dehydration processes, the vibration detection device 51 detects vibration below a predetermined level.
34 is made to be soft, that is, free to move in the vertical direction. This makes it possible to greatly reduce the vibration transmitted to the floor while keeping the vibration of the main body 22 of the washing machine small. Further, when the vibration detecting device 51 detects a vibration of a predetermined value or more, the installation foot 34 is made hard, that is, the installation foot 34 is restrained in the vertical direction. As a result, excessive vibration of the washing machine main body 22 can be prevented, and a problem that a large noise is generated by interfering with the side wall of the kitchen or the like can be solved when the built-in installation is performed in the system kitchen or the like.

[0024]

As described above, according to the present invention, the installation foot can be moved in the vertical direction via the cushion, and the restraining means for restraining the movement of the installation foot in the vertical direction is provided. Depending on the hardness, it is possible to set the installation foot in a vertically movable state or in a restrained state, which can keep the vibration of the washing machine main body small and reduce the vibration transmitted to the floor surface. It can be achieved.

Further, by the control device, the installation foot is restrained up to the drum rotation number at which the floor surface resonates at the start of the dehydration process, and then the movable leg is allowed to move up and down, which is determined by the weight of the water tank. Excessive vibration of the washing machine body can be prevented at the time of resonance of the frequency, and vibration transmitted to the floor can be greatly reduced from the time of resonance of the high frequency with the floor surface to the normal rotation of dehydration. It is a thing.

Further, when the vibration detecting means detects a vibration of a predetermined magnitude or more, the control means controls the restraining means to bring the installed foot into a restrained state, thereby washing, rinsing,
Furthermore, it is possible to prevent excessive vibration of the washing machine body when the unevenness of the clothes in the drum is large during the dehydration process, and when the vibration of the washing machine itself is small such as when the unevenness of the clothes in the drum is small. Is capable of significantly reducing the vibration transmitted to the floor surface.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a configuration of a drum type washing machine according to an exemplary embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view showing details of the installation foot 34 in FIG.

FIG. 3 is a flowchart showing an operation of the drum type washing machine of FIG.

FIG. 4 is a block diagram of a control unit in the drum type washing machine of FIG. 1.

FIG. 5 is a vertical cross-sectional view showing the structure of a drum type washing machine according to another embodiment of the present invention.

FIG. 6 is a block diagram of a control unit in the drum type washing machine of FIG.

FIG. 7 is a vertical cross-sectional view showing a configuration of a conventional drum type washing machine.

[Explanation of symbols]

 22 Washing machine main body 23 Drum 24 Water tank 28 Motor 34 Installation foot 35 Buffer 36 Solenoid 37 Floor vibration detector 38, 52 Control device 39 Grounding part 40 Rod 40a Notch 41 Sliding part 42 Pin 51 Vibration detection device

Claims (3)

[Claims] 1. A drum for accommodating and rotating laundry, a water tub for accommodating the drum to store washing water, and a bottom of a washing machine main body for accommodating the water tub to support the washing machine main body, Further, a drum type washing machine including an installation foot that is vertically movable via a cushioning body, and a restraint unit that restrains the movement of the installation foot in the vertical direction. 2. At the start of the dehydration process, the installation foot is restrained by the restraint means up to the drum rotation speed at which the floor surface resonates, and the restraint state by the restraint means is released at the drum rotation speed at which the floor surface resonates or more. The drum type washing machine according to claim 1, further comprising control means for controlling the installation foot so that the installation foot can move freely in the vertical direction. 3. A vibration detecting means for detecting the magnitude of vibration of the main body of the washing machine, and a state in which the restraining means releases the restraint state until the predetermined vibration detected by the vibration detecting means is free to move the installation foot in the vertical direction. The drum type washing machine according to claim 1, further comprising: a control unit that controls the restraining unit to restrain the installed foot when the vibration detecting unit detects a predetermined vibration or more.