KR20000045040A - Method for preventing the vibration occurrence of a washing machine - Google Patents

Abstract

PURPOSE: A method is provided to prevent the occurrence of excessive vibration and noise by removing or shortening a matching time with a natural frequency to avoid the superimposition of the vibration and the noise. CONSTITUTION: If the drain is completed after executing the washing and rinsing operations, a motor is operated to execute the dehydration operation and a present rotation speed value of a motor is detected(S205). It is judged whether the detected present rotation speed value is the same as a reference rotation speed value(S206). If the present rotation speed value is the same as the reference rotation speed as the judgement result, the number of rotations of the motor is changed in order for the present rotation speed value to be reached to a predetermined rotation speed, so the dehydration operation is carried out.

Description

How to prevent vibration of washing machine

The present invention relates to a method of preventing vibration of a washing machine, and more particularly, to a method of preventing vibration of a washing machine capable of quiet operation by preventing generation of vibration of an initial washing tank during dehydration operation of a washing machine.

In general, the washing machine is a product for washing the foreign substances in the laundry, such as clothes, bedding, etc. cleanly by using the washing action friction and the impact of the laundry by the emulsification of the detergent and the rotational movement. Such washing machines are currently manufactured with various kinds of washing machines, such as semi-automatic washing machines, automatic washing machines and drum washing machines, and air bubble washing machines, bag washing machines, loop washing machines, and the like. It is marketed.

The washing machines sequentially perform washing strokes, rinsing strokes, and dehydration strokes according to a predetermined amount of time according to a predetermined algorithm. In addition, the user may select only one stroke during washing, rinsing, and dehydrating stroke, and the user may selectively set a driving cycle of the selected one stroke to separately perform only one stroke.

Thus, the washing machine automatically drains the washing water present in the washing tank when the washing stroke and the rinsing stroke are completed, and automatically performs the dehydrating stroke when the washing water is drained. At this time, the laundry in the washing tank is biased to one side. It often happens that laundry is left unbalanced. When the laundry is placed in an unbalanced state in the washing tank, the washing tank performs an ellipse movement around the part where the laundry is biased due to the skew of the laundry during the dehydration initial administration. There was a problem in that damage and severe noise caused by the impact.

Therefore, conventionally, in order to prevent vibration and noise caused by the imbalance of the laundry, a laundry imbalance detecting device is installed in the washing machine as shown in FIG. 1A, and the above problems have been solved. Looking at the washing operation of the provided washing machine with reference to Figure 2a, first, when the washing stroke is completed and the rinsing water for the rinsing operation is supplied to the reservoir 12 and the washing tank 13 of the washing machine 11 to the control of the microcomputer. According to the rinsing operation for a predetermined time (S101).

Subsequently, when the rinsing operation is completed (S102), the washing water in the washing tank 13 is completely drained through the drain hose 14 (S103), and when the draining is completed (S104), the motor 15 for a predetermined time under the control of the microcomputer. ) To operate the gear device 16 associated with it to perform a preliminary dehydration operation (S105). Here, the preliminary dehydration operation is an operation for detecting the imbalance of the laundry as described above.

Subsequently, during the preliminary dehydration operation, the microcomputer detects an on / off state of the first switching contact 17 that detects an unbalanced state of the washing machine (S106). Subsequently, it is determined whether the on / off operation of the first switching contact 17 is repeatedly performed according to the on / off state detection result of the first switching contact 17 (S107).

As a result of the determination, when the repetitive on / off operation of the first switching contact 17 is not detected, the microcomputer continuously drives the motor 15 to perform the main dehydration operation of the washing machine (S108).

On the other hand, if the repeated on / off operation of the first switching contact 17 is detected as a result of the determination, the microcomputer determines that the laundry is in an unbalanced state in which the laundry is biased to one side in the washing tub 13 to stop the driving of the motor 15, The rinse water is resupplied in step 13 (S109) to perform a laundry imbalance correction operation in the washing tank 13 through the rinsing stroke.

Subsequently, when the imbalance correction operation of the laundry is completed through the rinsing cycle, that is, when the rinsing cycle is completed, the unbalance detection operation of the washing machine is repeatedly performed.

If the unbalance detection is repeated even more than a predetermined number of times through such an unbalance detection operation of the laundry, all the operations of the washing machine are stopped and the user is warned through an alarm device so that the user can directly correct the unbalance of the laundry.

If the on / off state of the first switching contact 17 is continuously detected even during the step S107, that is, during the main dehydration operation, the motor 15 is stopped to stop the current dehydration stroke in progress and the step S109. From the operation again to perform the laundry correction operation sequentially.

However, in the washing machine according to the related art as described above, it is possible to prevent the occurrence of unbalance of the washing tank generated during its washing operation and also to prevent the occurrence of unbalance, but it does not suppress the occurrence of vibration.

That is, in the conventional washing machine, dehydration was performed by gradually increasing the motor in a predetermined pattern at the initial stage of the dehydration stroke. At this time, when the gradual speed is increased, the vibration overlaps with the natural frequency of the motor, thus excessively amplifying. There was a problem.

When the vibration is excessively generated as described above, the noise is also increased proportionally, which adversely affects the quiet operation of the washing machine.

Accordingly, the present invention has been made in order to solve the above problems according to the prior art, the object of the present invention is to suppress the vibration generated during the dehydration operation during the washing operation of the washing machine to generate a vibration of the washing machine that can be quiet operation To provide a prevention method.

Another object of the present invention is to provide a method of preventing vibration of a washing machine which can avoid overlapping of vibration and noise by shortening a matching time with natural frequency when the speed of the motor of the washing machine is gradually increased.

Figure 1a is a cross-sectional view schematically showing the configuration of a washing machine according to the prior art.

Figure 1b is a flow chart showing the washing operation of the washing machine according to the prior art.

Figure 2 is a flow chart showing a method of preventing vibration during washing operation of the washing machine according to the present invention.

Figure 3 is a flow chart showing a vibration generation method according to another embodiment of the present invention.

♣ Explanation of symbols for main part of drawing ♣

11: washing machine 12: reservoir

13: washing tank 14: drain hose

15 motor 16 gear device

17: first switching contact 18: second switching contact

These objectives are to prevent the vibration of the washing machine with a microcomputer in which the reference rotational speed value of the motor is generated when the natural frequency is the highest during dehydration operation and the set rotational speed value of the motor is generated when the natural frequency is the minimum. In the method, if the drainage is completed after executing the washing stroke and the rinsing stroke, operating the motor to execute the dehydration stroke and detecting the current rotational speed value of the motor at that time; Determining whether the rotation speed value is equal to the reference rotation speed value, and if the current rotation speed value and the reference rotation speed value are the same as the result of the determination, change the rotation speed of the motor so that the current rotation speed value reaches the set rotation speed value. It is achieved by the method of preventing vibration of the washing machine comprising the step of executing the dehydration stroke.

In addition, the above object is to generate the vibration of the washing machine having a reference time from the initial driving time of the motor during the dehydration operation to the time when the maximum vibration is generated, and the reference speed of the motor at the time when the vibration is minimal input In the prevention method, when the drainage is completed after the washing stroke and the rinsing stroke, the step of counting the elapsed time every predetermined time while operating the motor to execute the dehydration stroke, the counted elapsed time and the reference Comparing the time and determining whether they are equal to each other; and if the elapsed time and the reference time are the same as the result of the determination, changing the rotational speed of the current motor corresponding to the reference rotational speed to perform the dehydration stroke. It can be achieved by a method for preventing the vibration of the washing machine characterized in that.

Hereinafter, a method of preventing vibration of a washing machine according to the present invention will be described with reference to the accompanying drawings.

2 is a flowchart showing a method for preventing vibration during washing operation of the washing machine according to the present invention, and FIG. 3 is a flowchart showing a method for preventing vibration according to another embodiment of the present invention. .

As an essential and basic step for executing the vibration prevention method of the washing machine according to the present invention, first, the user is the reference rotational speed value (V1) of the motor at the point of time when the frequency is the highest when dehydration operation occurs and the point of time when the frequency is generated to the minimum After determining the set rotation speed value (V2) of the motor and storing it in the microcomputer (S201), after executing the washing stroke (S202) and after performing the rinsing stroke (203), it is determined whether the drainage is completed (S204). .

As a result of the determination, if the drainage is completed, the motor is operated to execute the dehydration stroke and the current rotational speed value V3 of the motor at that time is detected (S205). When the subsequent rotation speed value V3 is detected as described above, it is determined whether the detected current rotation speed value V3 is equal to the reference rotation speed value V1 (S206), and the current rotation speed value V3 and the reference point. If it is determined that the rotation speed value V1 is the same, the rotation speed of the motor is changed so that the current rotation speed value V3 reaches the set rotation speed value V2 set in the microcomputer (S207). Then, it is determined whether the dehydration aroma is completed (S208) and the predetermined washing operation ends.

Accordingly, by avoiding the overlap between the natural frequency of the motor and the actual frequency during the washing operation, it is possible to prevent the vibration of the washing tank in the initial stage of the dehydration operation.

On the other hand, the vibration generating method of the washing machine according to the present invention may prevent the generation of vibration on the basis of the time when the maximum vibration is generated, not the rotation speed value of the motor as described above, that is, shown in FIG. As shown, the reference time (T1) from the initial start of the motor drive to the time when the maximum vibration occurs during the dehydration operation during the washing operation, and the reference speed (F) of the motor at the time when the vibration is minimal After inputting to the microcomputer (S301), the washing cycle is executed (S302), and after the rinsing stroke (303), it is determined whether the drainage is completed (S304).

As a result of the determination, if the drainage is completed, the motor is operated to execute the dehydration stroke and the elapsed time T2 is counted every predetermined time (S305). Thereafter, the counted elapsed time T2 and the reference time T1 are compared and determined to be the same (S306). If the elapsed time T2 and the reference time T1 are determined to be the same, the current motor By changing the rotational speed corresponding to the reference rotational speed F of the motor at the time when the vibration is minimal as described above (S307), the predetermined main dehydration stroke is executed, and it is determined whether the dehydration stroke is completed ( S308) The predetermined washing operation ends.

As a result, according to the method of preventing vibration of the washing machine according to the present invention, when the speed of the motor of the initial stage of the washing machine increases gradually, the coincidence time with the natural frequency is eliminated or shortened, thereby avoiding the overlap of vibration and noise. Since excessive generation of noise can be prevented, the quiet operation of the washing machine is improved.

Claims (2)

Method for preventing vibration of a washing machine with a microcomputer in which the reference rotation speed value (V1) of the motor at the time of generating the highest frequency and the set rotation speed value (V2) of the motor at the time of generating the minimum frequency of vibration are generated. To If the drainage is completed after the washing stroke and the rinsing stroke, the step of starting the motor to execute the dehydration stroke and detecting the current rotational speed value V3 of the motor at that time; Determining whether the detected current rotation speed value V3 is equal to the reference rotation speed value V1; As a result of the determination, if the current rotation speed value V3 and the reference rotation speed value V1 are the same, the dehydration operation is performed by changing the rotation speed of the motor so that the current rotation speed value V3 reaches the set rotation speed value V2. Vibration prevention method of the washing machine comprising the step of executing. Vibration of the washing machine with a microcomputer in which the reference time T1 from the beginning of the motor driving to the time when the maximum vibration is generated and the reference speed F of the motor at the time when the vibration is generated during the dehydration operation are input. In the occurrence prevention method, When the drainage is completed after the washing stroke and the rinsing stroke, the step of counting the elapsed time (T2) every predetermined time while operating the motor to execute the dehydration stroke, Comparing the counted elapsed time T2 with the reference time T1 and determining whether they are the same; As a result of the determination, if the elapsed time T2 and the reference time T1 are the same, changing the current rotational speed of the current motor according to the reference rotational speed F includes executing the dehydration stroke. How to prevent vibration of the washing machine.