JPH0357488A - Drum type washing machine - Google Patents

Abstract

PURPOSE:To smoothly rotate a rotary drum in a state that eccentricity is almost eliminated and to reduce vibration and noise at the time of dehydration processing by rotating the rotary drum at high speed in a state that a balance controller is operated and a weight body is held in a rotation stop position so as to cancel the eccentricity in the load of the rotary drum at a maximum. CONSTITUTION:In a rotary drum 12, right and left weight bodies 15 are provided so as to be horizontally supported by a slave inside clutch shaft 14, for which an axial core is same as this rotary drum, to be supported to be relatively rotationally moved and stopped independently of the rotary drum and to position the respective centroid in spots separated from the axial core of the slave inside clutch shaft 14 toward centrifugal direction only for a prescribed distance. Then, the balance further, which a vibration sensor is built in to detect the vibration to be generated from the rotary drum 12 at the time of dehydration processing, and the balance to apply instructions for the relatively rotational move and rotation stop of the weight bodies 15 to a motor 14 so as to lower vibration amount based on a detected vibration signal from the vibration sensor when the vibration amount is more than a prescribed value is built in.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention relates to a drum-type washing machine, and more specifically,
The laundry in the rotating drum is picked up by a hook provided on the inner surface of the peripheral wall of the rotating drum, and is dropped onto the surface of the washing liquid (water or hot water containing or not containing detergent) in the rotating drum. This invention relates to a drum-type washing machine that uses impact to wash clothes.

(B) Conventional technology Traditionally, drum-type washing machines have a fixed drum that is fixed inside the main body of the washing rack and stores washing liquid, and a drum that is rotatably supported horizontally within the fixed drum and can store laundry in a basket. A washing machine equipped with a rotary tram and a rotating tram configured to allow the washing liquid to enter and exit is widely known. Such drum-type washing machines have advantages such as requiring less amount of washing liquid and causing less damage to the laundry.

(c) Problems to be Solved by the Invention In such a drum-type washing machine, when the washing and rinsing stages in which the rotating drum rotates at low speed are completed, most of the laundry containing moisture is deposited at the bottom of the rotating drum. The rotary drum is placed under eccentric load at the bottom when it is at rest. Therefore, during the dewatering stage in which the rotating drum rotates at high speed, the unbalanced load causes the rotating drum to generate extremely large vibrations and noise caused by the vibrations.

In order to prevent this vibration and noise, efforts have been made to improve the position and strength of the springs that suspend the fixed drum, and to install dampers to prevent vibrations, but this is not sufficient, and the fixed drum is made up of iron or concrete blocks. Currently, a balance weight is installed to prevent vibrations. However, this balance weight is extremely heavy, which makes the product, the washing iron, heavy (sometimes over 100 kg), making it difficult to pack, transport, and set up.

This invention was made in consideration of the above circumstances, and therefore,
To provide a drum-type washing machine capable of reducing vibration and noise during spin-drying without using extremely heavy balance weights.

(2) Means for Solving the Problems and Their Effects This invention consists of a fixed drum fixed inside the main body of the washing machine and storing washing liquid, and a fixed drum rotatably supported horizontally within the fixed drum. A rotating drum that can store laundry and allow the washing liquid to enter and exit, a rotating drum motor that rotates the rotating drum, and a rotary drum that rotates relative to the rotating drum and stops within the rotating drum. supported as possible,
A predetermined number of heavy bodies whose centers of gravity are located a predetermined distance away from the axis in the centrifugal direction, a heavy body motor that drives these heavy bodies in relative rotation, and vibrations generated from a rotating drum are detected. It is equipped with a vibration sensor and a balance control circuit that balances the rotating drum based on the output of the vibration sensor.The balance control circuit drives the rotating drum during dehydration processing and changes the rotation speed from low speed to high speed in multiple stages. a motor drive circuit for the rotating drum, a comparison circuit that compares the vibration sensor output with multiple vibration levels that are set in stages to become lower as the rotating drum rotation speed increases, and This drum-type washer includes a heavy body motor drive circuit that rotates the heavy body so that the vibration sensor output becomes smaller than a set vibration level when the heavy body is rotating.

In other words, the present invention includes a weight body which is supported within a rotating drum so as to be able to move and stop in relative rotation with the same precision as the rotating drum, and whose center of gravity is located at a specific location where the center of gravity is the center of rotation (the above-mentioned axis). During the dewatering process, this heavy body is rotated to the opposite point of the lower part of the rotating drum where the laundry is unevenly distributed, that is, to the upper part of the rotating drum, and stopped in an appropriate vertical position, thereby eliminating the weight imbalance inside the rotating drum. In this situation, the rotating drum is rotated at high speed to perform dehydration treatment.

Here, the balance control device is used as a means for stopping the weight body at an optimal position while avoiding rotation. This balance control device is connected to a motor for a heavy object, and receives the output of a vibration sensor that detects vibrations during dehydration rotation in a rotating drum and converts the detection results into electrical signals, and then controls the motor to rotate the heavy object. This is a control device that gives movement and stop instructions.

Three to four different comparison levels for vibration are stored in the balance control circuit. Then, the vibration is checked (compared) using the highest vibration level when the rotating drum rotates at low speed. If vibration is detected, the position of the weight body is moved to confirm whether vibration has been reduced. After that, as the rotation of the rotating drum is increased to a predetermined number of rotations, the dehydration of the laundry progresses, so once the laundry is balanced, the balance will be lost due to dehydration, so it is necessary to check the vibration level again. Correct the position of the weight body accordingly.

By repeating the above process and gradually increasing the rotation of the rotating drum, vibrations can be reduced from the time when the rotating drum starts rotating to when it rotates at high speed.

(f2) Here, the rotary drum motor may be a motor for a heavy body or a motor that also serves as a motor for a heavy body, or may be a separate motor from the motor for a heavy body.

By activating the balance control device at the initial stage of the dewatering process and holding the weight body at an optimum position, the center of gravity of the rotary drum containing the laundry containing water is aligned with the axis of the rotary shaft as much as possible. By rotating the rotary drum at high speed with the load unbalance improved, it is possible to reduce vibrations during the dehydration process.

(e) Examples Hereinafter, the present invention will be described in detail based on embodiments shown in the figures.

Note that this invention is not limited to this.

In FIG. 1, a stationary drum 2 for storing washing liquid is fixed within an outer box l that constitutes a part of the main body of a drum-type fully automatic washing machine W. Motor unit fixing units 3 and 3 are respectively attached to the outer surfaces of the left and right side walls of the fixed drum 2, and motors 4 and 4 are fixed to these fixing plates 3 and 3I, respectively. The rotational force is sequentially transmitted to the flange-shaped cylindrical driven clutch shafts 9, 9 via the motor boosters 5, 5, the belts 6, 6, the clutch pulleys 7, 7, and the driving ffll + clutch shafts 8, 8. It has become. The opposing ends of these driving side clutch shafts 8, 8 and driven outer clutch shafts 9, 9 are housed in clutch cases 10, 10.

Inside the fixed drum 2, there are drum flanges II. A drum-shaped rotating drum l2 is disposed, which is supported via a drum and which can store laundry. The rotating drum 12 has a pair of left and right drum halves 12al2a, each of which has a large number of small holes 12b-+2b on the side wall through which the irrigating liquid can enter and exit.
, a defective ring-shaped drum packing 13 having water permeability.
It is connected by.

The rotating drum 12 is further provided with one opening 21 1 2 c in its peripheral wall for loading and unloading the laundry, and a pair of left and right sliding doors 12 d - which open and close this opening 2 c. 12d is provided. Further, small protrusions 13a=1 on the inner surface of the peripheral wall of the drum packing 13.
3a are provided in large numbers. These small projections 13a...
The rake 13a improves washing performance by rubbing against the laundry when the rotary drum 12 rotates, and also lifts the laundry upward.

Inside the rotating drum 12, there are a pair of left and right disc-shaped weight bodies l5.
15 is placed near each side wall of the rotating drum 12, and is fitted into the driven outer clutch $1119/9 so that the shaft centers are the same! 4.! 4 at each end. Driven inner clutch side I4/14
The pond end faces the driving side clutch shaft 8, 8 in the clutch case IO, 10.

Each clutch case 10 has a built-in clutch mechanism. With this clutch mechanism, the forward and reverse rotations of the motor 4 are transmitted to the weight body l5 via the driven inner clutch sleeve 14, and the forward rotation of the motor 4 is transmitted to the rotating drum l2 via the driven outer clutch shaft 9. only the information is conveyed. Incidentally, the motors 4 serve both as a rotary drum driving motor and a heavy body driving motor.

As shown in FIG. 2, each weight body 15 includes a disc-shaped main body 15a, and four protrusions 115b and +5 formed integrally with the main body +5a at a predetermined distance from each other on the periphery of the main body 15a.
It consists of b, 15b, and +5b. That is, these protrusions 15b, 15b, 15b, 15b are the same shape and the same size, and one of them is parallel to the line NL in FIG. One on one side and three on the other side are formed so that a weight imbalance occurs with the NL line as a boundary.

The fixed drum 2 has a watertight structure with seal packings 17 and 17, except for the opening 2a for the inner i16, and the rotating drum 12 is almost submerged in water! 2 can be avoided. At the upper part of the right wall of the fixed drum 2, there is a water supply port 2 to which the water supply pipe I9 of the water supply unit 18 shown in FIG.
0 is set. Further, on the lower right side of the fixed drum 2, a water α detection port 2c is provided for detecting the water level by a water level detection device (not shown).

The water that entered from the tap water supply port 20 on the upper right side of the outer box L,
Follow one of the following four routes. That is, (2) Water is supplied from the water supply port 2b of the upper part of the fixed drum 2 through the water supply solenoid valve 21 and the water supply pipe I9. ■Water supply solenoid valve 2
1. Water is supplied from the drain port 2d at the bottom of the fixed drum 2 via the vertical pipe 22, the horizontal pipe 23, the water supply 7a solenoid valve 24, and the water supply hot water supply hose 25. ■Hot water supply solenoid valve 26, storage tank 27 with heater , horizontal pipe 23, water supply and hot water supply solenoid valve 24
Hot water is supplied from the water supply port 2d via the hot water supply hose 25; (2) Hot water is supplied from the water supply port 2b via the hot water supply electromagnetic valve 26, the hot water storage tank 27, the vertical pipe 22 and the water supply pipe 19;

The used washing liquid is drained through the drain port 2d, the drain electromagnetic valve 28, and the drain hose 29.

A balance control device 30 as shown in FIG. 4 is incorporated in the washing iron main body. That is, this balance control device 30 includes a CPU 3 =1 that controls the ROM 3 1, RAM 32, timer 33, etc., a vibration sensor 35 that detects vibrations during dehydration processing, and a drive that drives the motors 4. It is comprised of circuits 36, 37, a drive circuit 38 for driving the clutch IO, an E/O port 39, and the like.

This balance control device 30 operates as follows. That is, after finishing the washing/rinsing process, the rotating drum 12
stops rotating once. The rotating drum 12 then begins to rotate at a "low speed" and moves to the dehydration treatment means.

At this time, if there is no eccentricity of the laundry load inside the rotating drum 12, the amount of vibration is small, and the value is R
The three setting levels written in the OM, i.e. the fifth
The rotating drum l2 rotates at three speeds, namely "low speed", "medium speed" and "high speed", and undergoes dehydration treatment. I can do it.

On the other hand, if there is an eccentricity of the load inside the rotating drum l2 during low-speed rotation, the output signal of the vibration sensor 35 becomes as shown in the curve (a) in FIG. 5, and the amount of vibration exceeds the third level C. become. When the CPU determines that the amount of vibration has exceeded the third level C, the two weight bodies 15, 15, which are driven separately by the drive circuit 36 and the drive circuit 37, move during the period shown in FIG. 5(C). A rotational position at which the amount of vibration decreases below level C is searched by trial and error. Then, the weight body 15/I5 is stopped at the rotational position where the amount of vibration is minimized. Next, the heavy body! 5.15
The rotary drum I2 is rotated at the second stage "medium speed" while holding the drum at the same position to perform dehydration processing. The amount of vibration is the second
It is checked whether level b is exceeded, and if it is, the position of the weight body is corrected in the period shown in FIG. 5(B). And even more, a rotating drum! The rotation speed of the weight body 15 was increased to the third level "high speed" and the amount of vibration was compared with the first level a.
15 position corrections are made.

Thus, the amount of vibration during dehydration increases over time.
Reach level A or below. In addition, by specifying the maximum rotation speed of the rotating drum l2, the dewatering rate can be determined. I can do 5i. Further, (V) in FIG. 5 is a graph showing the vibration state of the rotating drum 12.

In this drum-type fully automatic washing machine W, as mentioned above, a slave measuring clutch shaft is installed in the rotary drum I2 and has the same sleeve core as the rotary drum 12! 4, l4, and is supported so as to be able to move relative rotationally and stop independently of the rotating drum 12, and each center of gravity is located at a predetermined distance in the centrifugal direction from the axis of the slave movement (all clutch MI4, l4). Two left and right weight bodies 15 are provided, and a vibration sensor is built in to detect the vibration generated from the rotating drum 12 during dehydration processing, and the amount of vibration is determined to be above a predetermined value based on the detected vibration signal from the vibration sensor. A balance control device 30 is incorporated which instructs the motors 4, 4 to move and stop the relative rotation of the weight bodies 15, 15 so as to reduce the amount of vibration.

Therefore, according to this washing machine W, the balance control device 30 is avoided and the weight body 1 is placed at the rotation stop position where the eccentricity of the load on the rotary drum I2 can be eliminated to the maximum during the dehydration process.
5・■Avoid high-speed rotation of the rotary drum L2 while holding 5? As a result, the rotating drum 12 rotates smoothly with almost no eccentricity, and vibration and noise during the dehydration process can be reduced.

(f) Effects of the invention In the drum-type washing machine of this invention, as mentioned above,
A weight body of a predetermined number of sides is supported within a rotating drum so that it can be relatively rotated and stopped about the same axis as the rotating drum, and each center of gravity is located at a location a predetermined distance away from the axis in a centrifugal direction, and A heavy body motor that drives the heavy body in relative rotation is provided, and a vibration sensor that detects vibrations generated from the rotating drum during dehydration processing is provided, and the amount of vibration is determined based on the detected vibration signal from the vibration sensor. A balance control device is provided that instructs the heavy body motor to operate and stop at a level corresponding to the rotation speed of the rotating drum in order to reduce the amount of vibration when the vibration amount exceeds the value.

Therefore, according to the present invention, the weight body is stopped at a position where the amount of vibration during dehydration processing is kept lower than a predetermined value by a balance control device, and the eccentricity of the load on the rotating drum is maintained while the weight body is held at the stopped position. It becomes possible to rotate at high speed with almost no vibration, and it becomes possible to effectively reduce the vibration and noise generated during dehydration processing without using an extremely heavy balance weight as in the past.

[Brief explanation of drawings]

Figures 1 to 5 show one embodiment of the present invention, with Figure 1 being a vertical sectional view of the center of a drum-type fully automatic washing machine, and Figure 2 being a perspective view of the heavy bodies that make up the washing machine. Figure 3 is a schematic diagram of the water supply and hot water supply unit that makes up the laundry shore, Figure 4 is a schematic diagram of the balance control device that makes up the laundry shore, and Figure 5 is the rotation of the weight body corresponding to the heating level. It is a time chart showing the operation. 2...Fixed drum, 4...Motor, 9...Horizontal shaft (driven external clutch shaft), 12...
... Rotating drum, 14 ... Driven inner clutch shaft, l5 ...
・Weight body, 30...Balance control device〇Little brother 1 Figure 2 Figure 3 Figure 18 Figure 4

Claims (1)

[Claims] 1. A fixed drum that is fixed inside the washing machine body and stores washing liquid, and a horizontally supported rotatable drum within this fixed drum.
A rotary drum configured to be able to store laundry and allow the washing liquid to enter and exit, a rotary drum motor for rotationally driving the rotary drum, and a rotary drum that rotates relative to the same axis as the rotary drum and stops within the rotary drum. A predetermined number of heavy bodies are supported, each having a center of gravity located a predetermined distance away from the axis in the centrifugal direction, a heavy body motor that drives these heavy bodies in relative rotation, and a rotating drum. It is equipped with a vibration sensor that detects vibrations that occur, and a balance control circuit that balances the rotating drum based on the output of the vibration sensor. A rotating drum motor drive circuit that changes the rotational drum in stages, a comparison circuit that compares the vibration sensor output with multiple vibration levels that are set in stages to become lower as the rotational drum rotation speed increases, and When rotating at rotational speed,
A drum-type washing machine comprising a heavy body motor drive circuit that rotates the heavy body so that the output of a vibration sensor becomes smaller than a set vibration level.