KR0133050Y1 - Apparatus for anti-noise of a washing machine - Google Patents

Abstract

The present invention relates to a noise attenuation device of a washing machine that attenuates noise generated during a drainage stroke of a washing machine, the washing machine comprising: a current for sensing a driving current of a drain pump 41 that changes during the drainage stroke of the washing machine; Comparing means for receiving the sensing means 10, the drive voltage signal from the current sensing means 10 and the reference voltage signal from the reference voltage generating means 50 to compare the drive current of the drain pump 41 to determine the drive current 20, the control means 30 for receiving the comparison voltage signal from the comparison means 20 and controlling the driving of the drain pump 41, and the drive current sensed by the current sensing means 10. Accordingly, it characterized in that it consists of a drain pump driving means 40 for driving the drain pump 41 receives the control signal from the control means (30).

Description

Noise reduction device of washing machine

1 is a schematic cross-sectional view of a conventional washing machine.

2 is a control block diagram of a noise reduction device of a washing machine according to an embodiment of the present invention.

3 is a detailed circuit diagram of a noise canceling device of a washing machine according to a temporary embodiment of the present invention.

Figure 4 is a flow chart illustrating a noise attenuation operation procedure of the washing machine according to the present invention.

* Explanation of symbols for main parts of the drawings

1: AC power input terminal 10: current sensing means

20: comparison means 30: control means

40: drain pump driving means 41: drain pump

50: reference voltage generating means

The present invention relates to a noise attenuation device of a washing machine for attenuating the noise generated during the drainage administration of the washing machine.

In general, a washing machine according to the related art, as shown in FIG. 1, has an amount of washing water suitable for the introduced laundry in a state in which laundry is put into a washing / dehydration tank (hereinafter, referred to as a dehydration tank). When the water level in the dehydration tank (1) through the water supply valve (2) and the washing water level in the dehydration tank (1) is monitored by the water level sensor (3), the detergent dispenser (not shown) in the water supply washing The detergent in the amount appropriate for the water level is introduced into the dehydration tank (1).

At this time, washing is performed while the pulsator 4 is rotated in the left and right directions by the driving of the washing motor 5, and when washing and rinsing are completed, a drain pump 6 fixed to the lower left end of the washing tank 7 is provided. Is driven so that the water in the dehydration tank 1 is drained to the outside through the drain port 8.

However, during the drainage administration of the washing machine due to the driving of the drainage pump 6, even when the water in the dehydration tank 1 is completely drained to the outside, the drainage pump 6 continues to idle for a predetermined time. There is a problem that noise is radiated to the outside to provide a discomfort to the user and at the same time reduce the quality of the washing machine.

Therefore, the present invention has been made to solve the above-mentioned problem islands, and an object of the present invention is to detect the drive current of the load (drainage pump) that changes during idle and after drainage, and to detect the drive current. Accordingly, by controlling the driving of the drain pump, it is possible to more effectively attenuate the noise generated during the drainage stroke of the washing machine, thereby providing a noise reduction device of the washing machine that can satisfy the user's satisfaction and improve the quality of the washing machine. have.

Noise reduction device for a washing machine according to the present invention to achieve the above object is a washing machine, current sensing means for detecting the drive current of the drain pump changes during the drainage stroke of the washing machine, and the drive voltage from the current sensing means A comparison means for receiving a signal and a reference voltage signal from the reference voltage generating means and comparing the same to determine a driving current of the drain pump; control means for receiving a comparison voltage signal from the comparing means and controlling driving of the drain pump; And a drain pump driving means for receiving a control signal from the control means according to the driving current sensed by the current monitoring means and driving the drain pump.

Hereinafter, with reference to the accompanying drawings an embodiment of the present invention will be described in detail.

As shown in FIG. 1 to FIG. 2, the current sensing means 10 receives the commercial AC voltage from the AC power supply pressure stage 1 to drive the drain pump 41 which changes during the drainage stroke of the washing machine. By sensing the current, the current sensing means 10 receives the commercial alternating voltage from the AC power input terminal 1 and changes the drain pump 41 when the drain pump 41 is drained and when idle after draining. Current transformer 11 for detecting the drive current of the current and the resistance (R1) connected in parallel to the current transformer 11 to convert the drive current of the drain pump 41 sensed by the current transformer 11 into a voltage It is.

The reference voltage generating means 50 divides the constant voltage signal output from the constant voltage means (not shown) through the voltage dividing resistors R3 and R4 to convert the driving current converted by the resistor R1 of the current sensing means 10. Generates a reference voltage signal for comparison with the driving voltage signal according to.

In addition, the comparison means 20 receives the driving voltage signal from the current sensing means 10 at the inverting terminal (-) and simultaneously receives the reference voltage signal from the reference voltage generating means 50 at the non-inverting terminal (+). And a comparator for comparing the same to determine the driving current of the drain pump 41, and the control means 30 receives the comparison voltage signal output from the comparison means 20, and the drain pump 41 drains the water. It is a microcomputer for controlling the operation of the washing machine as well as controlling the driving of the drainage pump 41 by determining whether it is in progress or idling after drainage.

In addition, in the drawing, the drain pump driving means 40 receives the control signal from the control means 30 in accordance with the driving current sensed by the current transformer 11 of the current sensing means 10 and drain pump 41. By controlling the driving of the pump, the drain pump driving means 40 controls the inverter buffer INV for inverting the control signal output from the control means 30 and the control inverted by the buffer INV. A tri-turn that is turned on to receive the control signal from the means 30 at the gate terminal G through the resistor R2 and at the same time receive a commercial alternating voltage from the AC power input terminal 1 to drive the drain pump 41. It is composed of TRAIC.

Hereinafter, the effect of the noise damping device of the washing machine configured as described above will be described with reference to FIG.

3 is a flowchart illustrating a noise attenuation operation procedure of the washing machine according to the present invention. In FIG. 3, S denotes a step.

First, when power is supplied to the washing machine, in step S1 the control means 30 initializes the washing machine in accordance with the washing control function.

Subsequently, in step S2, it is determined whether the washing machine is a drainage stroke according to the washing stroke progress of the washing machine under the control of the control means 30, and the washing stroke determined by the control means 30 is the drainage stroke (Yes). In one case), the drain pump 41 is to be driven, so in step S3, the control means 30 outputs a high level control signal to the drain pump driving means 40 through the output terminal 01.

Accordingly, the drain pump driving means 40 receives a high level control signal output from the output terminal 01 of the control means 30 from the buffer INV and inverts it to a low signal, and then through the resistor R2. It is applied to the gate terminal G of the triac TRAIC.

At this time, when the voltage difference is generated between the gate terminal G and the terminal terminal T1 of the triac TRIC and the triac TRIC is turned on, the commercial AC voltage from the AC power input terminal 1 is a drain pump. It is applied to (41) to drive the drain pump (41).

Subsequently, in step S4, when the current 11 of the current sensing means 10 detects the driving current of the drain pump 41 that changes during the drainage stroke of the washing machine according to the driving of the drain pump 41, the current transformer ( The driving current of the drain pump 41 sensed by 11) is converted into a voltage through the resistor R1 and input to the inverting terminal (-) of the comparison means 20.

That is, the drain pump 41 has a difference in driving current (e.g., about 800 mA when draining, 700 mA when idle after draining) during drainage and idle after draining. Output to the comparison means 20.

At this time, the reference voltage generating means 50 generates a reference voltage signal for comparison with the driving voltage signal output from the current sensing means 10 and outputs it to the non-inverting terminal (+) of the comparison means 20.

The reference voltage signal of the reference voltage generating means 50 is a value obtained by dividing the constant voltage signal output from the constant voltage means (not shown) by the voltage dividing resistors R3 and R4, and the reference voltage is a multiple of the drain pump 41. The resistors R3 and R4 are selected so as to have a value between the two driving voltages, each of which converts the driving current which changes at the time of idling and at idle after drainage.

Therefore, in the comparison means 20, the driving voltage signal of the current sensing means 10 input to the inverting terminal (-) is the reference voltage signal of the reference voltage generating means 50 input to the non-inverting terminal (+). If larger, the drain pump 41 outputs a low signal to the control means 30 because the drain pump is in progress.

On the other hand, if the driving voltage signal of the current sensing means 10 input to the inverting terminal (-) of the comparison means 20 is smaller than the reference voltage signal, the drain pump 41 completes the drainage and is therefore idling. A high signal is output to the control means 30.

Accordingly, in step S5, a high or low comparison voltage signal output from the comparing means 20 is inputted from the control means 30 to determine whether the drain pump 41 is idling.

As a result of the discrimination in step S5, when the drain pump 41 determined by the control means 30 is idling (Yes), the drain stroke is completed, so that the drain pump 41 is stopped to stop the drain pump 41. By turning off the triac TRAIC under the control of the control means 30 in the pump driving means 40, the commercial AC voltage from the AC power input terminal 1 applied to the drain pump 41 is cut off.

In step S7, when the drain pump 41 stops, a timer built in the control means 30 counts time to determine whether a predetermined time has elapsed, and the predetermined time determined by the control means 30. If this has not elapsed (No), the drain pump 41 is turned off until a predetermined time has elapsed. If the predetermined time has elapsed (Yes), the flow proceeds to step S8 to perform the next stroke of the washing machine. End the next operation.

On the other hand, when the drainage pump 41 determined by the control means 30 does not idle (if No), the drainage pump 41 is in the process of drainage. If the operation of step S3 or less is repeated, and the result of the determination in step S2 indicates that the washing stroke determined by the control means 30 is not a drainage stroke (No), the flow advances to the step S8 and the next stroke of the washing machine. Then the operation ends.

According to the noise attenuation device of the washing machine according to the present invention, as described above, the driving current of the load (drainage pump) that changes at the time of drainage and idling after drainage is detected and the drainage pump is driven according to the detected driving current. By controlling the noise can be attenuated during the drainage stroke of the washing machine can satisfy the user's satisfaction, and there is an excellent effect that can further improve the quality of the washing machine.

Claims (1)

A washing machine comprising: a current sensing means (10) for sensing a driving current of a drain pump (41) which changes during a drainage stroke of the washing machine, a driving voltage signal from the current sensing means (10) and a reference voltage generating means ( A comparison means 20 for receiving a reference voltage signal from 50 and for comparing the driving current of the drain pump 41 and a comparison voltage signal from the comparison means 20 to receive the reference voltage signal of the drain pump 41. A control means 30 for controlling driving and a drain pump driving means for driving the drain pump 41 by receiving a control signal from the control means 30 in accordance with the driving current sensed by the current sensing means 10. Noise attenuation device of the washing machine, characterized in that consisting of (40).