KR0137122B1 - Adjustable draining speed for a washing machine - Google Patents

Adjustable draining speed for a washing machine

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Publication number
KR0137122B1
KR0137122B1 KR1019930031947A KR930031947A KR0137122B1 KR 0137122 B1 KR0137122 B1 KR 0137122B1 KR 1019930031947 A KR1019930031947 A KR 1019930031947A KR 930031947 A KR930031947 A KR 930031947A KR 0137122 B1 KR0137122 B1 KR 0137122B1
Authority
KR
South Korea
Prior art keywords
water
water level
level
pump
drainage
Prior art date
Application number
KR1019930031947A
Other languages
Korean (ko)
Other versions
KR950018845A (en
Inventor
박병구
Original Assignee
배순훈
대우전자 주식회사
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Application filed by 배순훈, 대우전자 주식회사 filed Critical 배순훈
Priority to KR1019930031947A priority Critical patent/KR0137122B1/en
Publication of KR950018845A publication Critical patent/KR950018845A/en
Application granted granted Critical
Publication of KR0137122B1 publication Critical patent/KR0137122B1/en

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Classifications

    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F33/00—Control of operations performed in washing machines or washer-dryers 
    • D06F33/30—Control of washing machines characterised by the purpose or target of the control 
    • D06F33/32—Control of operational steps, e.g. optimisation or improvement of operational steps depending on the condition of the laundry
    • D06F33/42—Control of operational steps, e.g. optimisation or improvement of operational steps depending on the condition of the laundry of draining
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
    • D06F34/14—Arrangements for detecting or measuring specific parameters
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F39/00—Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00 
    • D06F39/08—Liquid supply or discharge arrangements
    • D06F39/083—Liquid discharge or recirculation arrangements
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F39/00—Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00 
    • D06F39/08—Liquid supply or discharge arrangements
    • D06F39/087—Water level measuring or regulating devices
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/18—Washing liquid level

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)
  • Control Of Positive-Displacement Pumps (AREA)

Abstract

주소헹굼행정중 급수량이 배수량보다 많을 경우에 리세트 수위에서 트립수위까지 시간을 측정하여 그 속도에 따라 배수펌프의 속도를 제어하여 물이 세탁기 밖으로 넘치는 것을 방지 한다.If the water supply is larger than the drainage during the address rinse administration, the time is measured from the reset level to the trip level and the speed of the drainage pump is controlled according to the speed to prevent the water from overflowing the washing machine.

Description

배수속도변환이 가능한 세탁기Washing machine capable of converting drainage speed

제1도는 본 발명에 이용되는 세탁기의 개략적인 종단면도.1 is a schematic longitudinal sectional view of a washing machine used in the present invention.

제2도는 본 발명에 적용되는 세탁기의 개략적인 제어회로도.2 is a schematic control circuit diagram of a washing machine applied to the present invention.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

1 : 저수조2 : 배수펌프1: reservoir 2: drain pump

3 : 마이콤22 : 수위센서3: micom 22: water level sensor

23 : 배수펌프모터TR1-TRT3 : 트라이액23: drain pump motor TR1-TRT3: triac

Q1-Q3 : 트랜지스터가 : 펌프구동부Q1-Q3: Transistor: Pump Drive

본 발명은 배수속도변환이 가능한 세탁기에 관한 것으로, 특히 주수헹굼시 급수량에 따라 배수량을 제어함으로써, 급수되는 세탁수가 세탁조를 넘쳐흐르게 되는 것을 방지할 수 있도록 한 배수속도변환이 가능한 세탁기에 관한 것이다.The present invention relates to a washing machine capable of converting the drainage rate, and more particularly, to a washing machine capable of converting the drainage rate to prevent the washing water from overflowing the washing tank by controlling the drainage amount according to the amount of water supplied during rinsing.

종래에 펌프를 이용하여 배수하는 세탁기에서 주수헹굼시 배수는 주수헹굼수위가 트립수위(TRIP POINT)까지 도달하여야 배수가 시작되도록 되어 있고, 이때 배수펌프의 토출량은 일정하게 되어 있어 가령 급수량이 배수펌프 토출량보다 많은 경우 급수되는 세탁수는 세탁조를 넘쳐 흐르게 된다.Conventionally, when rinsing water in a washing machine drained using a pump, drainage starts when the water rinsing water level reaches the trip point (TRIP POINT), and the drainage of the drainage pump is constant. When the discharge amount is larger than the amount of discharged water, the washing water overflows the washing tank.

그러므로 주구헹굼시 상기 급수되는 세탁수가 세탁조를 넘쳐흐르지 않도록 고수위 이하에 리세트수위를 설정하여 상기 급수되는 세탁수가 상기 트립수위와 리세트수위 사이를 왔다 갔다 하면서 헹굼을 하도록 되어 있는 바, 그러나 주수헹굼시 급수량에 비하여 많은 경우 상기 리세트수위가 고수위이하에 있어 수위가 낮아지게 되므로 세탁수가 부족하여 원활한 주수헹굼을 할 수 있고, 반면에 급수량이 많은데 비하여 배수량이 작은 경우 세탁수는 세탁조를 넘쳐흐르게 되는 문제점을 가지게 되었다.Therefore, the washing water is set to be at or below the high water level so that the water to be washed does not overflow the washing tank during the rinsing of the pot, and the washing water is rinsed back and forth between the trip water level and the reset water level. In many cases, the reset water level is lower than the high water level, so the water level is lowered. Thus, the washing water may be rinsed smoothly due to lack of wash water. On the other hand, when the water supply amount is large, the wash water overflows the washing tank. I have a problem.

본 발명의 목적은 세탁수를 배수펌프로 배수하는 세탁기에 있어서, 주수헹굼시 급수량에 따라 배수량을 제어하여 급수되는 세탁수가 세탁조를 넘쳐흐르지 않게 하면서 헹굼을 할 수 있도록 하고자 하는 데 있다.An object of the present invention is to provide a washing machine for draining the wash water to the drainage pump, to control the amount of drainage according to the amount of water during the rinsing of the wash water so as to rinse the washing water so as not to overflow the washing tank.

상기의 목적을 실현하기 위하여 본 발명은 세탁시 급배수되는 세탁수의 수위를 감지하는 수위센서와, 상기 수위센서로부터 수위신호를 받아 제어하고 제어된 신호를 출력하는 마이콤과, 상기 마이콤으로부터 제어신호를 받아 펌핑구동하면서 배수하는 배수펌프로 구성되는 세탁기에 있어서, 상기 수위센서로부터 입력되는 수위에 따라 그에 해당하는 제어신홀출력하는 마이콤의 출력제어단자 각각에는 제어신호에 따라 온, 오프 구동하는 펌프구동부와, 상기 펌프구동부의 온, 오프 구등에 따라 전압이 변환되어 펌핑속도가 가변되는 배수펌프를 구성하여서 된 것을 특징으로 한다.In order to achieve the above object, the present invention provides a water level sensor for detecting the water level of the washing water drained during washing, a microcomputer receiving and controlling a water level signal from the water level sensor, and outputting a controlled signal, and a control signal from the microcomputer. In the washing machine consisting of a drain pump for draining while receiving the pumping drive, the pump driving unit for driving on and off in accordance with the control signal to each of the output control terminals of the microcom outputs a corresponding control new hole according to the water level input from the water level sensor And, it is characterized by consisting of a drain pump that the voltage is converted in accordance with the on, off, etc. of the pump driving unit is variable pumping speed.

이하 첨부된 도면에 의거 본 발명을 상세히 설명하면 다음과 같다.Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

제 1 도는 본 발명에 이용되는 세탁기의 개략적인 종단면도로서, 1은 저수조로서 세탁수가 급수되고, 2는 오버플로우 파이프로서 상기 저수조(1)에 과급수시 세탁수를 배수하게 된다. 3은 배수펌프로서 펌핑하면서 저수조(1)의 배수하고 4는 배수호스로서 상기 세탁수를 배수하며, 5는 배수밸브로서 개폐되면서 저수조(1)의 세탁수를 배수호스(4)로 배수하게 된다. 6은 기어부로서 상기 세탁모터의 회전력을 감속하게 되고, 7은 벨트로서 상기 세탁모터의 회전력을 전달하며, 8은 세탁모터로 세탁 및 헹굼시 펄세이터(도시되지 않음)회전시켜 세탁하게 된다.FIG. 1 is a schematic longitudinal sectional view of a washing machine used in the present invention, in which 1 is a wash water supply as a reservoir, and 2 is a overflow pipe to drain the wash water when the water is supercharged. 3 drains the water tank 1 while pumping as a drain pump, 4 drains the wash water as a drain hose, and 5 drains the wash water from the water tank 1 to the drain hose 4 while opening and closing it as a drain valve. . 6 decelerates the rotational force of the washing motor as a gear part, 7 transmits the rotational force of the washing motor as a belt, and 8 rotates the pulsator (not shown) when washing and rinsing with the washing motor.

9는 급수밸브로서 개폐하면서 세탁수를 저수조에 급수하게 되고, 10은 급수호스이다. 12는 압력호스이며, 22는 수위센서로 상기 압력호스의 압력상태로 급배수수위를 감지하게 된다.9 is the water supply valve while opening and closing the water supply to the reservoir, 10 is the water supply hose. 12 is a pressure hose, 22 is a water level sensor to detect the water supply and drainage level in the pressure state of the pressure hose.

제 2도는 본 발명에 적용되는 세탁기의 개략적인 제어회로도로서, 세탁시 급수되는 세탁수의 수위를 감시하는 수위센서(22)와, 상기 수위센서(22)로부터 입력되는 수위신호를 받아 제어하고 제어된 신호를 출력하는 마이콤(21)와, 상기 마이콤(21)으로부터 제어신호를 받아 펌핑구동하면서 배수하는 배수펌프(3)로 구성되는 세탁기 앞에 있어서, 상기 수위센서(22)로부터 리세트수위로부터 트립수위까지 도달 시간에 따라 그에 해당하는 제어신호를 출력하는 마이콤(21)의 출력제어단자(P1)(P2)(P3) 각각에는 제어신호에 따라 온, 오프 구동하는 저항(R1-R4), 트랜지스터(Q1-Q3), 트라이액(TR1-TR3)로 구성되는 펌프구동부(가)와, 상기 펌프구동부(가)의 온, 오프 구동에 따라 텝변환되면서 전압이 변환되어 펌핑속도가 가변되는 배수펌프(3)으로 구성하여서 된 것이다.FIG. 2 is a schematic control circuit diagram of a washing machine applied to the present invention. The water level sensor 22 monitors the level of the wash water supplied to the washing machine, and receives and controls the water level signal input from the water level sensor 22. In front of the washing machine composed of a microcomputer 21 for outputting a signal and a drain pump 3 for draining while receiving a control signal from the microcomputer 21 and pumping driving, it trips from the water level sensor 22 from the reset water level. Each of the output control terminals P1, P2, and P3 of the microcomputer 21 that outputs the corresponding control signal according to the arrival time to the water level has a resistor (R1-R4) and a transistor for driving on and off according to the control signal. A pump driving part (A) consisting of (Q1-Q3) and triacs (TR1-TR3), and a drain pump having a variable pumping speed while the voltage is changed by stepping in accordance with the on / off driving of the pump driving part (A). It consisted of (3).

상기와 같이 구성되는 본 발명의 작용효과를 설명하면 다음과 같다.Referring to the effects of the present invention configured as described above are as follows.

먼저 세탁행정이 완료되어 주수헹굼이 시작되면 상기 마이콤(21)에서는 급수밸브(9)를 열어 저수조(1)에 급수함과 아울러 모터(8)를 정, 역회전시켜 헹굼하되, 이때 상기 마이콤(21)에서는 펌프구동부(가)를 통해서 배수펌프(3)를 구동시켜 상기 헹굼수를 배수하면서 헹굼하게 되는 바, 이때 상기 배수펌프(3)는 상기 급수되는 세탁수의 수위가 저수조(1)의 트립수위에 도달할 때까지 구동하지 않고 있다가 상기 급수수위가 트립수위에 도달하게 되면서 배수펌프(3)가 작동하여 급수되는 세탁수를 배수하게 된다.First, when the washing stroke is completed and the water rinsing starts, the microcomputer 21 opens the water supply valve 9 to supply water to the reservoir 1 and rinses the motor 8 by forward and reverse rotation. 21, the pump driving unit (A) to drive the drain pump (3) to rinse while draining the rinsing water, wherein the drain pump (3) is the water level of the wash water to be supplied to the reservoir (1) While not driving until the trip water level is reached, the water supply level reaches the trip water level, and the drain pump 3 operates to drain the wash water.

상기와 같이 주추헹굼을 진행하는 중에 상기 저수조(1)로 급수되는 급수량이 상기 배수펌프(3)를 통해서 펌핑되어 배수되는 배수량보다 많게 되는 경우, 상기 급수되는 세탁수는 상기 저수조(1)의 트립수위를 넘어 저수조(1)를 넘쳐흐르게 된다.When the amount of water supplied to the water storage tank 1 is more than the amount of water drained by being pumped through the drain pump 3 during the main rinsing as described above, the water to be washed is tripped by the water storage tank 1. The water tank overflows the reservoir 1.

그러므로 상기 마이콤(21)에서는 상기 수위센서(22)상기 저수조(1)에 급수되는 수위를 감지하게 되는 바, 이때 상기 마이콤(21)내에는 상기 정상적인 급수가 이루어질 경우 기설정된 고수위에서 트립수위까지 도달시간에 따라 배수량을 달리하여 배수하면서 헹굼을 하게 되는데, 예를 들어 고수위에서 트립수위까지 도달시간 : 10초일 때 배수펌프(3)는 강회전하여 펌핑하고, 15초일 때 배수펌프(3)는 중회전하여 펌핑하며, 20초일 때 배수펌프(3)는 약회전하면서 펌핑하여 배수하도록 한다.Therefore, the microcomputer 21 detects the water level supplied to the water level sensor 22 and the water storage tank 1. At this time, when the normal water supply is made in the microcomputer 21, the water level reaches a trip level at a predetermined high water level. The rinsing is performed while draining by varying the drainage according to time. For example, when the water reaches the trip level from the high water level to the trip level: the drain pump 3 is pumped in a strong rotation at 10 seconds, and the drain pump 3 is 15 times at 15 seconds. It is pumped by electricity, and when 20 seconds, the drain pump 3 is pumped while being rotated about to drain.

따라서 상기 급수하면서 헹굼중에 상기 마이콤(21)에서는 수위센서(22)로부터 고수위로부터 배수펌프(3)를 구동시키게 되는 트립수위까지 급수되는데 걸리는 시간 즉 도달시간을 감지하게 되는데, 이 때 상기 수위센서(22)로부터 트립수위까지 도달시간이 10초 걸렸으면 상기 마이콤(21)에서는 배수량에 비하여 급수량이 많은 것으로 판단하여 급수되는 세탁수가 저수소(1)를 넘쳐흐르게 되는 것을 방지하기 위하여 출력제어단자(P1-P3)중 출력제어단자(P1)로부터 제어신호를 출력하게 되고, 이 제어신호를 펌프구동부(가)의 트랜지스터(Q1)를 구동시키고 트라이액(TR1)을 구동시켜 상기 전원은 트라이맥(TR1)을 통해서 흐르게 되어 강회전하면서 펌핑하게 되어 상기 급수되는 수위가 트립수위 이하로 되게 하면서 주수헹굼을 하게 되고, 상기와 같이 헹굼수위를 낮추면서 헹굼중에 상기 수위센서(22)로부터 현재 급수수위가 트립수위와 리세트수위 사이로 낮추어지게 되면 상기 마이콤(21)에서 계속해서 강회전할 경우 급수량보다 배수량이 많아지게 되어 원활한 헹굼을 할 수 없으므로, 급수수위가 고수위이하로 낮아지는 것을 방지하기 위하여 상기 마이콤(21)에서는 출력제어단자(P1)의 제어신호를 차단하고, 반면에 출력제어단자(P2) 또는 (P3)를 통해서 펌프구동부(가)에 제어신호를 출력하여 트랜지스터(Q2) 또는 (Q3)를 구동시키고 트라이액(TR2) 또는 (TR3)을 구동시켜 상기 전원은 트라이액(TR2) 또는 (TR3)을 통해서 흐르게 하여 배수펌프(3)를 중회전 또는 약회전하면서 펌핑 배수하면서 헹굼하고, 이어서 상기 급수수위가 다시 상승하여 수위센서(22)로부터 마이콤(21)에서 트립수위에 도달하는 것으로 감지되면서 상기 마이콤(21)에서는 배수량에 비하여 급수량이 많은 것으로 판단하여 급수되는 세탁수가 저수조(1)를 넘쳐흐르게 되는 것을 방지하기 위하여 출력제어단자(P2)(P3)를 차단하고 출력제어단자(P1)로부터 제어신호를 출력하여, 이 제어신호는 펌프구동부(가)의 트랜지스터(Q1)를 구동시키고 트라이액(TR1)을 구동시켜 상기 전원은 트라이액(TR1)을 통해서 흐르게 되어 강회전하면서 펌핑하게 되어 상기 급수되는 수위가 트립수의 이하로 되게 하면서 주수헹굼을 하게 되는 것이다.Therefore, during the rinsing while supplying the water, the microcomputer 21 detects the time taken to supply the water from the high water level to the trip level to drive the drain pump 3 from the high water level, whereby the water level sensor ( If it took 10 seconds to reach the trip level from 22), the microcomputer 21 determines that the amount of water supplied is larger than the amount of drained water, so as to prevent the washing water from flowing over the hydrogen 1 and output control terminal P1. The control signal is outputted from the output control terminal P1 of -P3, and this control signal drives the transistor Q1 of the pump driver and drives the triac TR1 to supply the trimac TR1. Pumped while being rotated strongly to make the water supply level be below the trip level, and the rinse water level is rinsed as described above. If the current water level from the water level sensor 22 is lowered between the trip level and the reset level during rinsing while the water is continuously rotated in the microcomputer 21, the amount of drainage is greater than that of the water supply, so smooth rinsing cannot be performed. In order to prevent the water supply level from being lowered below the high water level, the microcomputer 21 blocks the control signal of the output control terminal P1, while the pump driving unit (A) is output through the output control terminal P2 or P3. Outputs a control signal to drive transistor Q2 or Q3 and drives triac TR2 or TR3 so that the power flows through triac TR2 or TR3 to drain pump 3 ) And rinsing while pumping and draining with medium or low rotation, and then the water level rises again to detect that the trip level is reached at the microcomputer 21 from the water level sensor 22. The microcomputer 21 determines that the amount of water supplied is larger than the amount of drained water, and blocks the output control terminals P2 and P3 to prevent the washing water from overflowing the reservoir 1 and is controlled from the output control terminal P1. The control signal outputs a signal to drive the transistor Q1 of the pump driver A to drive the triac TR1 so that the power flows through the triac TR1 and is pumped while rotating strongly. Water rinsing is performed while the water level is below the tripping rate.

이상에서 설명한 바와같이 본 발명은 주수헹굼시 급수량이 배수량보다 많아지면 배수펌프속도를 강회전시켜 배수량을 많이 하여 급수되는 세탁수가 저수조를 넘쳐흐르게 되는 방지하고, 상기 급수되는 수위가 트립수위와 리세트수위의 사이로 낮아지면 배수펌프속도를 중이나 약으로 회전시켜 더 이상 배수가 낮아지는 방지하도록 함으로써, 주수헹굼을 원활하게 할 수 있는 효과를 제공하게 되는 것이다.As described above, in the present invention, when the amount of water supplied during the rinsing of the main water is greater than the amount of drainage, the speed of the drain pump is strongly rotated to prevent the washing water from overflowing the water tank by increasing the amount of drainage, and the level of the water supplied is tripped and reset. When the water level is lowered between the middle and about to rotate the drain pump speed to prevent further drainage, it is to provide an effect that can smoothly rinse the water.

Claims (2)

세탁시 급배수되는 세탁수의 수위를 감지하는 수위센서(22)와, 상기 수위센서(22)로부터 입력하는 수위신호를 받아 제어하고 제어된 신호를 출력하는 마이콤(21)와, 상기 마이콤(21)으로 부터 제어신호를 받아 펌핑구동하면서 배수하는 배수펌프(3)로 구성되는 세탁기에 있어서, 주수헹굼시 수위센서(22)로부터 리세트수위에서 트립수위까지 감지되어 입력되는 도달시간에 따라 그에 해당하는 제어신호를 출력하는 마이콤(21)과, 상기 마이콤(21)의 출력제어단자(P1)(P2)(P3) 각각에는 출력제어신호를 따라 온, 오프 구동하는 저항(R1-R4), 트랜지스터(Q1-Q3), 트라이액(TR1-TR3)로 구성되는 펌프구동부(가)와, 상기 펌프구동부(가)의 온, 오프 구동에 따라 텝변환되면서 전압이 변환되어 펌핑속도가 가변되는 배수펌프(3)로 구성하여서 된 것을 특징으로 하는 배수속도변환이 가능한 세탁기.The water level sensor 22 for detecting the water level of the washing water drained during washing, the microcomputer 21 for receiving and controlling the water level signal input from the water level sensor 22 and outputting the controlled signal, and the microcomputer 21 In the washing machine consisting of a drain pump (3) for draining while receiving the control signal from the pumping driving, according to the arrival time is detected from the water level sensor 22 to the trip level from the water level sensor 22 when the water rinsing The microcomputer 21 for outputting a control signal, and the output control terminals P1, P2, and P3 of the microcomputer 21 are resistors R1-R4 and on-off driving in accordance with the output control signal. A pump driving part (A) consisting of (Q1-Q3) and triacs (TR1-TR3), and a drain pump having a variable pumping speed while the voltage is changed by stepping in accordance with the on / off driving of the pump driving part (A). (3) the speed of drainage, characterized in that consisting of Washing machines are available. 제 1항에 있어서, 상기 주수헹굼시 수위센서(22)로부터 입력되는 리세트수위에서 트립수위까지 도달시간에 짧으면 배수펌프(3)를 강회전시켜 배수하고, 상기 배수펌프(3)를 강회전시켜 배수후 수위가 리세트수위와 트립수위 중간수위에 도달하면 배수펌프(3)를 낮게 회전시켜 가면서 배수하도록 구성하여서 된 것을 특징으로 하는 배수속도변환이 가능한 세탁기 .According to claim 1, If the time to reach the trip level from the reset level input from the water level sensor 22 to the trip level during the rinse of water, the drain pump (3) is rotated strongly and drained, the drain pump (3) is strongly rotated When the water level reaches the reset level and the trip level after draining, the drainage pump (3) is configured to drain while rotating the drainage, characterized in that the drainage speed conversion is possible.
KR1019930031947A 1993-12-31 1993-12-31 Adjustable draining speed for a washing machine KR0137122B1 (en)

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