KR19990040913A - Drainage completion device and method of drum washing machine - Google Patents

Abstract

The present invention relates to an apparatus and method for detecting drainage completion of a drum washing machine, which can detect wastewater completion and prevent power wastage and noise generation. The apparatus for drainage completion of a drum washing machine having a microcomputer includes a current flowing through the drain pump. The signal transmission unit converting the corresponding voltage value, the comparison unit comparing the voltage value output from the signal transmission unit with the preset reference voltage and outputting the comparison result, and determining whether the drainage is completed according to the output of the comparison unit And a switching unit for applying the operating power to the drain pump according to the control signal of the microcomputer, the method for detecting a drainage completion of the drum washing machine comprising: starting a drain and detecting a current value flowing in the drain pump; Comparing the voltage value corresponding to the current value with the reference voltage value, and comparing the voltage value with the reference voltage value If they are determined as a multiple completion so made, including the step of stopping the driving of the drain pump increase the power consumption inefficiencies and low noise can be realized.

Description

Drainage completion device and method of drum washing machine

The present invention relates to a washing machine, and more particularly, to an apparatus and method for detecting drainage completion of a drum washing machine.

In general, a washing machine is a machine for washing laundry by performing washing, rinsing, and dehydrating strokes according to a set algorithm. The washing machine is classified into a pulsator type, a stirring type, a drum type, and the like according to a washing method.

At this time, the drum washing machine has been widely used, with the advantage of lowering the damage rate of laundry and the lowest use quantity, compared to other types of washing machines. As shown in FIG. 1, a damper (not shown) inside the main body 1 and the main body 1 is shown. Tub (2) fixed by the (2), laundry is put into the tub (2), the drum (3), the drum (3), which is rotated by receiving the driving force of the motor (10) through the belt (11) and rotating. 3) The thermistor (4) for measuring the temperature of the washing water supplied to the detergent, the detergent container (5) for the input of the detergent, connected to the detergent container (5) to supply the wash water or the washing water mixed with the detergent of the detergent container (5) Water supply pipe (6) for drainage, a drain pipe (7) for discharging the washing water used in the washing stroke to the outside, a drain pump (8) and a drain hose (9) for forcibly pumping the wash water connected to the ends of the drain pipe (7) It is configured to include).

And when looking at the operation of the drum washing machine configured as described above, first, the user opens the door (not shown) attached to the front of the main body 1, put the laundry and then input the washing command, the wash water through the water supply pipe (5) Guided by (6), it is filled in the drum (7). Subsequently, the water level sensor (not shown) detects that the washing water is filled up to a predetermined level corresponding to the laundry which has been introduced and outputs the detected value to the controller. The control unit recognizes the completion of water supply according to the detected value and drives the motor 10 to rotate the drum 3 to proceed with washing.

On the other hand, when the washing is completed, the drain pump 8 is operated so that the washing water is drained to the outside via the drain pipe 7 and the drain hose 9, and when the draining is completed, rinsing and dehydration strokes are continuously performed to wash laundry. It ends.

At this time, the drainage stroke is performed by forcibly discharging the washing water to the outside of the washing machine by continuously driving the drainage pump 8 according to the driving pulse applied to the drainage pump 8 for a predetermined time regardless of whether the drainage stroke is completed. Some wash water remains at the bottom of the tub (2).

Therefore, after the drainage is completed, the drainage pump 8 is not discharged to the outside of the washing machine through the drain hose 9 because the drainage pump 8 does not generate water pressure more than a predetermined level even though the pump is continuously driven and pumped. By idling, the wash water flows in the drain hose (9).

Drum washing machine according to the prior art has the following problems.

First, since the drain pump is driven for a predetermined time regardless of whether drainage is completed, the drain pump is idle and power is wasted.

Second, since the pump is idling after drainage, the washing water remaining in the drain hose is not discharged to the outside of the washing machine due to lack of water level, and flows in the drain hose to generate noise.

Accordingly, an object of the present invention is to provide a drum washing machine drainage completion device and method for preventing waste of power and noise by detecting whether drainage is completed by devising to solve the above problems. .

1 is a cross-sectional view showing the structure of a general drum washing machine

Figure 2 is a layout showing the drainage completion device of the drum washing machine according to the invention

Figure 3 is a flow chart showing a drainage completion detection method of the drum washing machine according to the present invention

Explanation of symbols for main parts of the drawings

1: body 2: tub

3: drum 4: thermistor

5: detergent container 6: water pipe

7: drain pipe 8: drain pump

9: drain hose 10: motor

11: Belt 20: Micom

Triac: Triac T ₁ : Pulse Trans

A ₁ : OP Amp

The present invention provides a device for detecting a drainage completion of a drum washing machine, comprising: comparing a signal transmission unit for converting a current flowing in a drain pump into a voltage value corresponding thereto, and comparing the voltage value output from the signal transmission unit with a predetermined reference voltage. It comprises a comparison unit for outputting the comparison result, a microcomputer for stopping the drainage by determining whether the drainage is completed according to the output of the comparison unit, and a switching unit for applying the operating power to the drain pump in accordance with the control signal of the microcomputer.

According to another aspect of the present invention, there is provided a method for detecting a drainage completion of a drum washing machine, the method including: detecting drainage current by flowing drainage, comparing a voltage value corresponding to the current value with a reference voltage value; Comprising the comparison result, if the voltage value is less than the reference voltage value is determined to complete the drainage comprises the step of stopping the driving of the pump.

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the drainage completion detection device and method of the drum washing machine according to the present invention.

Figure 2 is a layout showing a drainage completeness detecting device of the drum washing machine according to the present invention, Figure 3 is a flow chart showing a drainage completion detection method of the drum washing machine according to the present invention.

As shown in FIG. 2, the apparatus for detecting drainage completion of the drum washing machine includes a microcomputer 20 for controlling the stroke of the drum washing machine, a drain pump 8 driven by AC power, and the microcomputer 20. On / off according to the control signal of the triac Triac (Triac) for applying the operating power to the drain pump 8, the voltage value corresponding to the current flowing in the drain pump 8 to a predetermined level to the next stage a pulse transformer (pulse trans) (T _1), OP amplifier for outputting a comparison result by comparing the voltage value with a reference voltage delivered from the front end through the pulse transformer (T ₁₎ to the microcomputer (20) for transmitting ( A ₁ ) is configured to include.

In this case, the pulse transformer T ₁ is used to remove noise on signal transmission simultaneously with signal transmission.

The drainage completion detection method of the drum washing machine to which the drainage completion device configured as described above is applied is as follows.

As shown in FIG. 3, the method for detecting drainage completion of the drum washing machine according to the present invention first performs a washing or rinsing operation by appropriately driving various loads such as a washing motor and a water supply valve according to a predetermined washing algorithm. do.

Subsequently, the microcomputer 20 applies a control signal to the gate of the triac triac of the drainage completion detection device to turn on, thereby applying driving power to the motor of the drain pump 8. Accordingly, the drain pump 8 pumps the washing water used in the washing or rinsing stroke to the outside of the washing machine through the drain hose 9 to proceed with drainage (S12).

At this time, while the drainage is taking place the current flowing in the motor is amplified to a predetermined level via the pulse transformer (T ₁₎ is input to one end of the OP amplifier (A ₁₎ is converted to a voltage value corresponding OP amplifier (A ₁₎ Is entered.

The op amp A ₁ compares the voltage value V _IN and the reference voltage value V _REF input through the pulse transformer T ₁ , and if V _IN is less than or equal to V _REF, the state is set for a predetermined time. It is determined whether it is maintained (S13).

Subsequently, when the determination result (S13), V _IN is maintained at a level below V _REF for the set time, the idle pump of the drain pump 8 is detected (S14), it is determined that the drainage is completed (S15).

At this time, when the drain pump 8 is idling, that is, when the wash water is almost drained and becomes below the water level, the load is hardly applied. Therefore, the flowing current is also greatly reduced and the corresponding V _IN value is also reduced. do.

In addition, the V _REF value is a reference voltage value set to correspond to the current flowing in the motor during idling the drain pump 8.

And V _IN value of V _REF, even below the level at which reaffirms the momentary change in number of days, so setting time for V _IN value change at the drain pump 8 is idling due to rather than by the idle rotation of the drain pump 8, the noise will be.

In addition, since the drain pump 8 idling means that the drainage is completed, the motor is stopped (S16), and the next stroke is performed (S17). For example, in the case of the drainage operation after the washing stroke, the rinsing stroke, and in the case of the drainage operation after the rinsing stroke, the dehydration stroke is performed.

Drainage completion detection device and method of the drum washing machine according to the present invention detects the idling of the drainage pump and determines the drainage to stop the operation of the drainage pump to prevent unnecessary power consumption and noise generation to improve power consumption efficiency and low noise There is an effect that can be realized.

Claims (6)

In the drainage completion detection device of a drum washing machine having a microcomputer, A signal transmission unit converting a current flowing in the drain pump into a voltage value corresponding thereto; A comparison unit comparing the voltage value output from the signal transmission unit with a preset reference voltage and outputting a comparison result; A microcomputer to stop drainage by determining whether drainage is completed according to the output of the comparison unit; And a switching unit configured to apply an operating power to a drain pump according to the control signal of the microcomputer. The method of claim 1, The signal transmission unit is a drainage completion detection device of a drum washing machine, characterized in that consisting of a pulse transformer. In the drainage detection method of the drum washing machine, Starting the drain to detect a current value flowing in the drain pump; Comparing a voltage value corresponding to the current value with a reference voltage value; And determining that the drainage is completed when the voltage value is less than or equal to the reference voltage value, and stopping driving of the drainage pump. The method of claim 3, wherein When the voltage value is less than the reference voltage value, determining that the drainage is complete, stopping the driving of the drain pump Determining whether the voltage value is maintained for a predetermined time when the voltage value is less than or equal to a reference voltage value; Determination of the drainage completion of the drum washing machine, characterized in that further comprising the step of stopping the driving of the drain pump in accordance with the determination result. The method of claim 4, wherein The reference voltage value is a drainage completion detection method of the drum washing machine, characterized in that the set value corresponding to the current value flowing in the drain pump when the drain pump is idle. The method of claim 4, wherein Determining the completion of the drainage according to the determination result to stop the driving of the drainage pump When the voltage value is maintained for a set time, the drainage completion detection method of the drum washing machine characterized in that the step of stopping the driving of the drain pump to determine the completion of drainage.