JP2019500936A - How to drain the washing machine - Google Patents

Abstract

The invention relates to a draining method for a washing machine, and the draining method includes a discharging step for controlling the drain pump (4) so that the water level in the outer tube (2) reaches a predetermined discharged water level, and the inner tube. And a dehydration step of controlling the drain pump (4) so as to intermittently operate while sequentially controlling the motor to perform dehydration. When the drain pump (4) operates by controlling the drain pump (4) to operate intermittently, the wash water in the outer cylinder (2) enters the drain pipe (3), and the drain pump By (4) pumping, it is discharged through the rising part of the drain pipe (3). When the drain pump (4) stops, the washing water at the rising portion of the drain pipe (3) is circulated under the action of gravity, and thus the drain pump (4) operates alternately. Or, the washing water at the rising portion is intermittently recirculated, and the foam floating in the washing water is easily discharged from the washing machine, thereby improving the rinsing effect of the washing machine and overflowing the foam. To prevent that. [Selection] Figure 2

Description

  The present invention belongs to the technical field of washing machines, and particularly relates to a draining method for washing machines.

  A drum-type washing machine has an outer cylinder and a drum disposed inside the outer cylinder. In general, a door of a drum-type washing machine is provided on the front panel, and a good position is provided between the door and the outer cylinder. Since it is necessary to have airtightness, the pressure in the washing machine increases during the washing process. The drum type washing machine is an upper drainage, that is, the drainage pipe has a rising part, a drainage pump is provided in the drainage pipe, and the water in the drainage pipe is pumped to the rising part via the drainage pump, and then drained. Discharged from the tube.

  When washing clothes with a drum-type washing machine, the amount of laundry detergent required varies depending on the quantity, material, and level of dirt. If different detergents are used to wash the same laundry, different amounts of detergent are required, which may cause the user to overfill the detergent when using the washing machine, and more in the outer cylinder Foam will be generated, and due to the good sealing property of the drum type washing machine, the foam is not easily broken, and the pressure in the outer cylinder increases, and the foam may overflow from the washing machine. Especially when the drum rotates at high speed during the dehydration process, the foam will increase more and more. In addition, when an excessive amount of detergent is added, the laundry after washing is insufficiently rinsed, and a strong detergent odor remains in the laundry.

  At present, particularly when detergent is excessively added, the laundry that has been washed is insufficiently rinsed, and a strong detergent smell remains in the laundry. Further, in the drainage discharge stage, the drum does not rotate and the cleaning water is discharged from the bottom of the outer cylinder through the drain pipe, but a foam floating in the cleaning water is formed, that is, the cleaning water is first After being discharged, the bubbles reach the drain and only a small amount of bubbles are discharged. Most of the foam is left in the washing machine, waiting for the foam to be removed in the next rinse step, and the laundry cannot be rinsed cleanly.

  The present invention provides a draining method for a washing machine, and more foam can be discharged from the washing machine in the draining process, thereby improving the washing effect of the washing machine and preventing the foam from overflowing.

  In order to achieve the above technical object, the present invention is realized by using the following technical solutions.

  A washing machine draining method, the washing machine comprising: an outer cylinder for storing washing water; an inner cylinder disposed in the outer cylinder; a motor for driving rotation of the inner cylinder; A drainage system having at least a drainage pipe and a drainage pump communicated with a bottom part, wherein the drainage method operates intermittently until the water level in the outer cylinder reaches a predetermined drainage water level A draining step for controlling the drainage pump, and a dehydrating step for controlling the motor to rotate the inner cylinder to perform dehydration and to control the drainage pump to operate intermittently.

  Further, the intermittent operation of the drainage pump is operated for 10 to 20 s and stopped for 2 to 10 s.

  Preferably, the intermittent operation of the drainage pump is operated in 12 to 18 s and stopped in 4 to 6 s.

  Further, the discharging step includes a step of detecting a water level in the outer cylinder and comparing the detection result with a predetermined drainage water level. When the detection result is higher than the predetermined drainage water level, the drain pump is continuously operated intermittently. When the detection result is equal to or smaller than the predetermined discharge water level, the drain pump is stopped.

  Furthermore, a load balancing step is further included between the discharging step and the dewatering step. The load balancing step controls the motor so that the inner cylinder rotates according to a predetermined distribution rotational speed, and detects the detected inner cylinder. It is determined whether or not the laundry in the inner cylinder is uniformly distributed according to the change in the rotation speed.

  Further, in the load balancing step, the rotational speeds at a plurality of locations on the rotation axis of the inner cylinder are detected and compared with a predetermined distributed rotational speed, respectively, and a difference value between the detected rotational speed and the predetermined distributed rotational speed is obtained. If all are within the predetermined range, the distribution of the laundry in the inner cylinder is balanced, the load balancing step is terminated, and if the difference value is not within the predetermined range, the distribution of the laundry in the inner cylinder is not good. Equilibrate and continue with the load balancing step.

  Further, the distribution rotational speed is 90 to 120 rpm.

  Preferably, the distribution rotation speed is 90 to 100 rpm.

  Further, the dewatering step includes a slow dewatering step, wherein the slow dewatering step is as follows: a. The motor is controlled such that the inner cylinder raises the rotation speed to perform dehydration, and the drainage pump is operated intermittently, and the maximum rotation speed of the inner cylinder at the time of low-speed dewatering is set as the first rotation speed. b. By detecting the water level in the outer cylinder, it is determined whether or not the foam in the washing machine exceeds a predetermined value. If the foam does not exceed the predetermined value, step c is executed, and the foam is determined to be a predetermined value. Is exceeded, the defoaming mode is executed, and then step a is continuously executed. The defoaming mode controls the motor so as to reduce the rotational speed of the inner cylinder to a predetermined rotational speed, and then Then, water is poured into the washing machine for a predetermined time, and water is poured and the drainage pump is operated intermittently. c. When the rotational speed of the inner cylinder is detected, it is determined whether or not the rotational speed of the inner cylinder has reached the first rotational speed, and when the rotational speed of the inner cylinder has reached the first rotational speed, the low-speed dehydration When the step is finished and the rotation speed of the inner cylinder is lower than the first rotation speed, the defoaming mode is executed, and then step a is continued.

  Furthermore, the first rotation speed is 350 to 450 rpm.

  Further, the intermittent operation of the drainage pump in step a is operated in 10 to 20 s and stopped in 2 to 10 s.

  Preferably, the intermittent operation of the drainage pump is operated in 12 to 18 s and stopped in 4 to 6 s.

  Furthermore, the water pouring time in the defoaming mode is 30 to 60 s.

  Further, the intermittent operation of the drainage pump in the defoaming mode is operated in 8 to 12 s and stopped in 2 to 6 s.

  Further, the distribution rotation speed is 90 to 100 rpm.

Furthermore, in the step b, by detecting the water level in the outer cylinder and comparing the detection result with a predetermined bubble water level, it is determined whether or not the bubbles in the outer cylinder exceed a predetermined value,
When the detected water level in the outer cylinder is equal to or higher than the predetermined bubble water level, it is determined that the bubbles in the outer cylinder exceed a predetermined value.

  Further, after the low-speed dewatering step is completed, the motor is controlled so as to lower the inner cylinder to a predetermined distribution rotational speed.

  Further, the dewatering step further includes a high-speed dewatering step after the low-speed dewatering step, and the high-speed dewatering step is as follows: The motor is controlled so that the inner cylinder raises the rotational speed to perform dehydration, and the drainage pump is operated intermittently, and the maximum rotational speed of the inner cylinder during high-speed dewatering is set as the second rotational speed. B. By detecting whether or not the inner cylinder has reached the second rotational speed within a predetermined time, it is determined whether or not the foam in the washing machine exceeds a predetermined value, and the foam exceeds the predetermined value. If not, the high-speed dewatering step is terminated, the motor is stopped, and if the foam exceeds a predetermined value, the defoaming mode is performed, and then step A is continued. In the defoaming mode, the motor is controlled so as to lower the rotational speed of the inner cylinder to a predetermined distribution rotational speed, and then water is poured into the washing machine for a predetermined time, water is poured, and the drainage pump is operated intermittently.

  Furthermore, the second rotation speed is 500 to 1000 rpm.

  Further, the dewatering step further includes a predetermined time dewatering step after the high speed dewatering step, and the predetermined time dewatering step controls the motor so that the inner cylinder performs dewatering by increasing the rotation speed to a third rotation speed. In addition, the drain pump is operated intermittently. After detecting that the predetermined time dehydration has reached the predetermined time, the motor is stopped and the drain pump is turned off.

  Further, the third rotation speed is 1100 to 1200 rpm.

  Furthermore, the drainage system includes a drainage valve, and the drainage valve is opened in the drainage method.

  Furthermore, the washing machine is a double drum washing machine, and includes a second washing system, and the second washing system includes a second outer cylinder and a second drain connected to the second outer cylinder. And a second drain valve installed on the second drain pipe, wherein the drain pipe has a bottom portion, a rising portion, and a free portion, and the bottom portion communicates with the outer cylinder. A drain valve and a drain pump are installed at the bottom, the second drain pipe is connected to the bottom between the drain valve and the drain pump, and the drain method is performed before the drain step. Alternatively, it may further include an occupation determination step for determining whether the drain pipe is operated for another washing system, and if the drain pump is occupied, it is necessary to wait.

  According to the drainage method of the washing machine provided with the present invention, when the drainage pump is operated by controlling the drainage pump to operate intermittently, the washing water in the outer cylinder enters the drainage pipe, and the drainage pump is pumped. Is discharged through the rising portion of the drain pipe. When the drainage pump stops, the washing water at the rising part of the drainage pipe is circulated under the action of gravity, and thus the drainage pump alternately operates and stops, and the washing water at the rising part is interrupted. Thus, the bubbles floating in the washing water are easily discharged from the washing machine, thereby improving the rinsing effect of the washing machine and preventing the bubbles from overflowing.

Other features and advantages of the present invention will become more apparent when viewing the detailed description of embodiments of the invention in conjunction with the drawings.
Description of the drawing.

It is a schematic block diagram of one Example of the drainage method of the washing machine which concerns on this invention.

It is a control flowchart figure of the draining method of the washing machine of FIG.

It is a schematic block diagram of one Example of the drainage method of the washing machine which concerns on this invention.

It is a control flowchart figure of the draining method of the washing machine of FIG.

It is a schematic block diagram of one Example of the drainage method of the washing machine which concerns on this invention.

It is a control flowchart figure of the draining method of the washing machine of FIG.

  To make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be described clearly and in detail with reference to the drawings of the embodiments of the present invention. To do.

  In the description of the present invention, it should be mentioned that the terms “upper” and “lower” indicate the direction or positional relationship based on the direction and positional relationship shown in the drawings, and the description of the present invention is easy and simple. However, it does not necessarily mean that the device or component is in a specific direction, nor does it indicate or imply a specific configuration or operation. Accordingly, it is not construed as limiting the invention. In addition, the terms “first”, “second”, and “third” are used to indicate the purpose of explanation and are not understood to indicate or imply relative importance.

  As shown in FIG. 1 to FIG. 2, it is a first embodiment of the draining method of the washing machine according to the present invention, the washing machine is an upper drain washing machine, and as shown in FIG. A housing 1, an outer cylinder 2, an inner cylinder, a motor, and a drainage system having a drainage pipe 3 and a drainage pump 4 communicated with the bottom of the outer cylinder 2, and the outer cylinder 2 stores washing water. And an inner cylinder is arrange | positioned in the outer cylinder 2, and accommodates the laundry. The drain pipe 3 has a bottom portion 31, a rising portion 32, and a free portion 33. The bottom portion 31 communicates with the bottom portion of the outer cylinder 2, the rising portion 32 is fixed on the housing 1, and the drainage pump 4 has a bottom portion. It is installed at 31 and pumps cleaning water to the rising portion 32, and the motor is fixed to the outer cylinder 2 to drive the rotation of the inner cylinder.

  FIG. 2 is a control flowchart of the washing machine draining method according to the present embodiment. The draining method of the washing machine includes a draining step for controlling the drainage pump 4 to operate intermittently until the water level in the outer cylinder 2 reaches a predetermined drainage water level, and the rotation of the motor for dehydration, and the drainage pump 4 A dehydration step for intermittent operation. In the intermittent operation of the drainage pump 4, the drainage pump 4 alternately operates and stops.

  When the drainage pump 4 is operated by controlling the drainage pump 4 to operate intermittently, the washing water in the outer cylinder 2 enters the drainage pipe 3, and the drainage pump 4 is pumped to raise the rising portion 32 of the drainage pipe 3. It is discharged through. When the drainage pump 4 stops, the washing water at the rising portion of the drainage pipe 3 is circulated under the action of gravity, and thus the drainage pump 4 alternately operates and stops, and the washing water at the rising portion Is intermittently recirculated, and the foam floating in the washing water is easily discharged from the washing machine, thereby improving the rinsing effect of the washing machine and preventing the foam from overflowing. Specifically, first, when the motor does not start, that is, when the inner cylinder is in a stationary state, the cleaning water in the outer cylinder 2 decreases as the cleaning water is smoothly drained. At that time, the washing water at the rising portion intermittently recirculates and collides with the remaining washing water in the washing machine, causing a water wave on the washing water surface, and some bubbles on the washing water surface are caught in the drain pipe 4 and drained. When the pump 4 is operated, it is pumped to the rising portion and then discharged from the washing machine. Secondly, when there is little remaining washing water in the washing machine, the washing water cannot fill the lumen of the drainage pump 4, and if some air enters, the drainage pump 4 raises the washing water. Cannot be pumped to. As the washing water at the rising portion 32 is continuously refluxed, the washing water pushes the air in the drainage pump 4, the drainage pump 4 can continue to operate, and the bubbles float upward at the rising portion 32 of the drainage pipe 3. The foam first reaches the free end portion 33 and is discharged from the washing machine. Thereafter, the cleaning water is discharged, and when the drainage pump 4 stops, the cleaning water in the rising portion 32 is returned to the bottom portion 31. In this way, the foam is discharged from the washing machine, the washing water in the rising portion 32 is refluxed, and more foam is discharged.

  In the present embodiment, the intermittent operation of the drainage pump 4 is installed as follows, that is, it is operated for 10 to 20 s and is stopped for 2 to 10 s. Preferably, the operation is performed in 12 to 18 s, and the operation is stopped in 4 to 6 s. More preferably, the operation is performed in 15 seconds and stopped in 5 seconds.

  In the discharging step, it is determined whether or not the water level in the outer cylinder 2 reaches a predetermined discharged water level, the water level in the outer cylinder 2 is detected, and the detection result is compared with the predetermined discharged water level. When the detection result is higher than the predetermined discharge water level, the drain pump 4 is continuously operated intermittently. When the detection result is equal to or smaller than the predetermined discharge water level, the drain pump 4 is stopped and the discharge step is ended.

  The discharged water level can be set according to the type of washing machine, and in general, the discharged water level is set to the water level at the bottom of the outer cylinder 2, that is, the water level in the outer cylinder 2 has reached the bottom of the outer cylinder 2. Is detected, the discharge step ends, and then the process proceeds to the next step.

  In this embodiment, after the discharging step is a load balancing step, and the load balancing step is to control the motor so that the inner cylinder rotates according to a predetermined distribution rotational speed. When the rotational speeds at a plurality of locations on the motor shaft are detected and compared with a predetermined distributed rotational speed, respectively, the difference between the detected rotational speed and the predetermined distributed rotational speed is all within a predetermined range. The distribution of the laundry inside becomes uniform, and the load balancing step ends. If the difference value is not within the predetermined range, the laundry distribution in the inner cylinder becomes non-uniform, and the load balancing step is continued.

  In this embodiment, the distribution rotation speed is 90 to 120 rpm, that is, the rotation speed of the inner cylinder is 90 to 120 rpm, preferably 90 to 100 rpm, and more preferably 95 rpm.

  In order to prevent large vibrations from being generated in the dewatering step due to uneven load distribution, the laundry in the inner cylinder is redistributed by controlling the motor so that the inner cylinder rotates according to a predetermined distribution rotational speed. Further, it is determined whether or not the load is uniformly distributed based on the detected change in the rotational speed of the motor shaft.

  In this embodiment, the dewatering step includes a low speed dewatering step and a high speed dewatering step. The slow dewatering step is as follows:

  a. The motor is controlled so that the inner cylinder raises the rotational speed to perform dehydration, and the drainage pump is operated intermittently, and the maximum rotational speed of the inner cylinder at the time of low-speed dehydration is set as the first rotational speed.

  In this step, the first rotation speed is 350 to 450 rpm, and preferably the first rotation speed is 400 rpm. That is, the rotational speed of the motor is controlled so as to increase from the distributed rotational speed. The intermittent operation of the drainage pump 4 is operated for 12 to 18 seconds and stopped for 4 to 6 seconds. Preferably, it is operated in 15 s and stopped in 5 s.

  b. By detecting the water level in the outer cylinder 2, it is determined whether or not the foam in the washing machine exceeds a predetermined value. If the foam does not exceed the predetermined value, step c is executed, and the foam exceeds the predetermined value. If yes, execute the defoaming mode, and then continue with step a.

  In the defoaming mode, the motor is controlled so as to reduce the rotation speed of the inner cylinder to a predetermined distribution rotation speed, and then water is poured into the washing machine for a predetermined time, water is poured, and the drainage pump is operated intermittently.

  By detecting the water level, it is determined whether or not the foam exceeds a predetermined value, and at the time of low-speed dewatering, the motor increases the rotation speed of the inner cylinder, and the laundry in the washing machine enters a saturated water absorption state. The washing water of the washing machine can be scattered, and the rapid rotational movement can increase the accumulation of bubbles in the washing machine so that the detected water level rises.

  In this step, it is determined whether or not the bubbles in the outer cylinder 2 exceed a predetermined value by detecting the water level in the outer cylinder 2 and comparing the detection result with a predetermined bubble water level. When the detected water level in the outer cylinder is equal to or higher than the predetermined bubble water level, it is determined that the bubbles in the outer cylinder are larger than the predetermined value. The bubble water level can be set to the water level at the lower end of the inner cylinder.

  In the defoaming mode, by driving the motor to reduce the rotational speed of the inner cylinder, firstly, the bubbles are prevented from overflowing due to the continuous increase of the bubbles during the rapid rotation. The increase in foam causes the load to become excessive and damages the motor itself. Secondly, by avoiding water injection, partially formed foam is eliminated, but it is directly scattered without being sufficiently in contact with the laundry and discharged from the washing machine. Thirdly, the speed of distribution is reduced by the detergent driven by the motor driving the rotation of the inner cylinder so that the laundry in the inner cylinder is sufficiently brought into contact with water injection, absorbed, washed and adsorbed on the laundry. The foam part is removed and discharged through a washing water pump. In this way, not only can the foam formed inside the washing machine be eliminated, it can also serve as a rinse of the laundry, reducing the amount of foam that can be formed in the washing machine, and the foam is again predetermined. Avoid exceeding the value as much as possible.

  In the defoaming mode, the intermittent operation of the drainage pump 4 is installed as follows, that is, operated in 12 to 18 s and stopped in 2 to 6 s. Preferably, the operation is performed in 10 s and stopped in 5 s. Compared to the operation time of the drainage pump 4 in step a, many foams formed and discharged from the washing machine by pressure feeding enhance the defoaming effect. The set water injection time is 30 to 60 s.

  c. When the rotational speed of the inner cylinder is detected, it is determined whether or not the rotational speed of the inner cylinder has reached the first rotational speed, and when the rotational speed of the inner cylinder has reached the first rotational speed, the low-speed dehydration When the step is finished and the rotation speed of the inner cylinder is lower than the first rotation speed, the defoaming mode is executed, and then step a is continued.

  In the defoaming mode, the motor is controlled so as to reduce the rotation of the inner cylinder to a predetermined distribution rotation speed, and then the washing machine is injected with water for a certain period of time, and the drainage pump is operated intermittently.

  In this step, when the motor drives the inner cylinder and rotates rapidly, the water adsorbed on the laundry in the inner cylinder and the adhering bubbles are pushed out, and many bubbles obstruct the rotation of the inner cylinder, and the rotation speed As the generated resistance increases, the motor needs to output more power at that time, and after the output power of the motor reaches the upper limit value, the rotation speed of the inner cylinder cannot be further increased. At that time, the actual rotational speed may not reach the predetermined rotational speed. After passing the defoaming mode of step b, many bubbles may remain, but the water level cannot be detected. By detecting the maximum rotation speed of the inner cylinder and determining whether or not the maximum rotation speed of the inner cylinder reaches the first rotation speed, it is determined whether or not the bubbles exceed a predetermined value. Furthermore, by detecting the increased speed, it is determined whether or not the foam exceeds a predetermined value, the foam is prevented from exceeding the predetermined value and the foam overflows, and in the subsequent high speed dehydration. , Avoid increasing the load due to increased foam and causing some damage to the motor.

  In this embodiment, after the low-speed dewatering step is completed, the motor is driven to reduce the inner cylinder to a predetermined rotational speed, and the high-speed dewatering step is performed. The high-speed dewatering step is as follows.

  A. The motor is controlled so that the inner cylinder raises the rotation speed to perform dehydration, and the drainage pump is operated intermittently, and the maximum rotation speed of the inner cylinder during high-speed dewatering is set as the second rotation speed.

  In this step, the second rotation speed is set to 800 to 1200 rpm, that is, the maximum rotation speed of the inner cylinder is set to 800 to 1200 rpm, and preferably the second rotation speed is set to 1000 rpm. The intermittent operation of the drainage pump 4 is installed as follows, that is, operated at 12 to 18 s and stopped at 4 to 6 s. Preferably, it is operated in 15 s and stopped in 5 s.

  As the motor rotates the inner cylinder to further increase the rotation speed, the water adsorbed on the laundry in the inner cylinder is further scattered. Many bubbles are discharged by the intermittent operation of the drainage pump 4.

  B. By detecting whether or not the inner cylinder has reached the second rotational speed within a predetermined time, it is determined whether or not the foam in the washing machine exceeds a predetermined value, and the foam does not exceed the predetermined value If this is the case, the high-speed dewatering step is terminated, the motor is stopped, and if the foam exceeds a predetermined value, the defoaming mode is performed, and then step A is continuously executed.

  In the defoaming mode, the motor is controlled so as to reduce the rotation speed of the inner cylinder to a predetermined distribution rotation speed, and then water is poured into the washing machine for a predetermined time, water is poured, and the drainage pump is operated intermittently.

  In this step, installation is performed so as to measure that the rotational speed of the inner cylinder reaches from 400 rpm to 1000 rpm within a set time of 3 to 8 seconds. By detecting whether or not the second rotational speed is reached within the set time, it is detected whether or not the foam in the high speed dewatering step exceeds a predetermined value.

  In this embodiment, after the high-speed dewatering step is completed, the drainage process is completed.

  In this embodiment, in order to increase the accuracy of detection of bubbles exceeding a predetermined value, the bubbles are prevented from overflowing by using different detection methods when bubbles at various stages exceed a predetermined value. .

  As shown in FIGS. 3-4, it is the 2nd Example of the drainage method of the washing machine which concerns on this invention, The main differences with a 1st Example are as follows. That is, the dewatering step further includes a dewatering step for a predetermined time after the high-speed dewatering step, and a drain valve is installed in the drain pipe, and the other steps use the same steps as in the first draining method.

  As shown in FIG. 3, the washing machine includes a housing 1, an outer cylinder 2, an inner cylinder, a motor, and a drain pipe 3, a drain pump 4, and a drain valve 5 that communicate with the bottom of the outer cylinder 2. The outer cylinder 2 stores washing water, and the inner cylinder is disposed in the outer cylinder 2 and stores laundry. The drain pipe 3 has a bottom portion 31, a rising portion 32, and a free portion 33, the bottom portion 31 communicates with the bottom portion of the outer cylinder 2, the rising portion 32 is fixed on the housing 1, and the drainage pump 4 and drainage The valve 5 is installed in the bottom part 31 and pumps washing water to the rising part 32. The motor is fixed to the outer cylinder 2 and drives the rotation of the inner cylinder.

  As shown in FIG. 4, it is a control flowchart figure of the draining method of the washing machine which concerns on a present Example. The washing machine draining method controls the drain pump 4 to operate intermittently until the water level in the outer cylinder 2 reaches a predetermined discharged water level, and controls the rotation of the motor to perform dewatering and intermittent operation. A dehydration step for controlling the drainage pump 4 so that the drainage valve 5 is opened before the drainage step, and the drainage valve 5 is closed when the drainage method is completed. In the intermittent operation of the drainage pump 4, the drainage pump 4 alternately operates and stops.

  When the drainage pump 4 is operated by controlling the intermittent operation of the drainage pump 4, the wash water in the outer cylinder 2 enters the drainage pipe 3, and the drainage pump 4 is pumped to push the rising portion 32 of the drainage pipe 3. Is discharged through. When the drainage pump 4 stops, the washing water at the rising portion of the drainage pipe 3 is circulated under the action of gravity, and thus the drainage pump 4 operates alternately or stops to wash the rising portion. The water is intermittently refluxed, and the foam floating in the washing water is easily discharged from the washing machine, thereby improving the rinsing effect of the washing machine and preventing the foam from overflowing. Specifically, first, when the motor does not start, that is, when the inner cylinder is in a stationary state, the cleaning water in the outer cylinder 2 decreases as the cleaning water is smoothly drained. At that time, the washing water at the rising portion intermittently recirculates and collides with the remaining washing water in the washing machine, causing a water wave on the washing water surface, and some bubbles on the washing water surface are caught in the drain pipe 4 and drained. When the pump 4 is operated, it is pumped to the rising portion and then discharged from the washing machine. Secondly, when there is little remaining washing water in the washing machine, the washing water cannot fill the lumen of the drainage pump 4, and if some air enters, the drainage pump 4 raises the washing water. Cannot be pumped to. As the washing water at the rising portion 32 is continuously refluxed, the washing water pushes the air in the drainage pump 4, the drainage pump 4 can continue to operate, and the bubbles float upward at the rising portion 32 of the drainage pipe 3. The foam first reaches the free end portion 33 and is discharged from the washing machine. Thereafter, the cleaning water is discharged, and when the drainage pump 4 stops, the cleaning water in the rising portion 32 is returned to the bottom portion 31. In this way, the foam is discharged from the washing machine, the washing water in the rising portion 32 is refluxed, and more foam is discharged.

  In the present embodiment, the intermittent operation of the drainage pump 4 is installed as follows, that is, it is operated for 10 to 20 s and is stopped for 2 to 10 s. Preferably, the operation is performed in 12 to 18 s, and the operation is stopped in 4 to 6 s. More preferably, the operation is performed in 15 seconds and stopped in 5 seconds.

  In the discharging step, it is determined whether or not the water level in the outer cylinder 2 reaches a predetermined discharged water level, the water level in the outer cylinder 2 is detected, and the detection result is compared with the predetermined discharged water level. If the detection result is higher than the predetermined discharge water level, the drainage pump 4 is continuously operated intermittently. If the detection result is equal to or smaller than the predetermined discharge water level, the drainage pump 4 is stopped and the discharge step is ended.

  The discharged water level can be set according to the type of washing machine. Generally, the discharged water level is set to the water level at the bottom of the outer cylinder 2, that is, the water level in the outer cylinder 2 reaches the bottom of the outer cylinder 2. When detected, the discharge step ends, and then the process proceeds to the next step.

  In this embodiment, after the discharging step is a load balancing step, and the load balancing step is to control the motor so that the inner cylinder rotates according to a predetermined distribution rotational speed. When the rotational speeds at a plurality of locations on the motor shaft are detected and compared with a predetermined distributed rotational speed, respectively, the difference between the detected rotational speed and the predetermined distributed rotational speed is all within a predetermined range. The distribution of the laundry inside becomes uniform, and the load balancing step ends. If the difference value is not within the predetermined range, the laundry distribution in the inner cylinder becomes non-uniform, and the load balancing step is continued.

  In this embodiment, the distribution rotation speed is 90 to 120 rpm, that is, the rotation speed of the inner cylinder is 90 to 120 rpm, preferably 90 to 100 rpm, and more preferably 95 rpm.

  In order to prevent large vibrations from being generated in the dewatering step due to uneven load distribution, the laundry in the inner cylinder is redistributed by controlling the motor so that the inner cylinder rotates according to a predetermined distribution rotational speed. Further, it is determined whether or not the load is uniformly distributed based on the detected change in the rotational speed of the motor shaft.

  In the present method, the dewatering step includes a low speed dewatering step, a high speed dewatering step, and a predetermined time dewatering step. The slow dewatering step is as follows:

  a. The motor is controlled so that the inner cylinder raises the rotational speed to perform dehydration, and the drainage pump is operated intermittently, and the maximum rotational speed of the inner cylinder at the time of low-speed dehydration is set as the first rotational speed.

  In this step, the first rotation speed is 350 to 450 rpm, and preferably the first rotation speed is 400 rpm. That is, the rotational speed of the motor is controlled so as to increase from the distributed rotational speed. The intermittent operation of the drainage pump 4 is operated in 12 to 18 s and stopped in 4 to 6 s. Preferably, it is operated in 15 s and stopped in 5 s.

  b. By detecting the water level in the outer cylinder 2, it is determined whether or not the foam in the washing machine exceeds a predetermined value. If the foam does not exceed the predetermined value, step c is executed, and the foam exceeds the predetermined value. If yes, execute the defoaming mode, and then continue with step a.

  In the defoaming mode, the motor is controlled so as to reduce the rotation speed of the inner cylinder to a predetermined distribution rotation speed, and then water is poured into the washing machine for a predetermined time, water is poured, and the drainage pump is operated intermittently.

  By detecting the water level, it is determined whether or not the foam exceeds a predetermined value, and at the time of low-speed dewatering, the motor increases the rotation speed of the inner cylinder, and the laundry in the washing machine enters a saturated water absorption state. The washing water of the washing machine can be scattered, and the rapid rotational movement can increase the accumulation of bubbles in the washing machine so that the detected water level rises.

  In this step, it is determined whether or not the bubbles in the outer cylinder 2 exceed a predetermined value by detecting the water level in the outer cylinder 2 and comparing the detection result with a predetermined bubble water level. When the detected water level in the outer cylinder is equal to or higher than the predetermined bubble water level, it is determined that the bubbles in the outer cylinder are larger than the predetermined value. The bubble water level can be set to the water level at the lower end of the inner cylinder.

  In the defoaming mode, by reducing the rotational speed of the inner cylinder to the distributed rotational speed by driving the motor, firstly, the foam is prevented from overflowing due to the continuous increase of the foam during the rapid rotation. The increase in foam causes the load to become excessive and damages the motor itself. Second, by avoiding water injection, a part of the formed foam is eliminated, but it is directly scattered without being sufficiently in contact with the laundry and discharged from the washing machine. Third, the speed of distribution is reduced by rotating the inner cylinder by driving the motor, bringing the laundry in the inner cylinder into sufficient contact with water injection, absorbing water, washing, and washing the detergent bubbles adsorbed on the laundry. Exclude part and drain through wash water pump. In this way, not only can the foam formed inside the washing machine be eliminated, it can also serve as a rinse of the laundry, reducing the amount of foam that can be formed in the washing machine, and the foam is again predetermined. Avoid exceeding the value as much as possible.

  In the defoaming mode, the intermittent operation of the drainage pump 4 is installed as follows, that is, operated in 12 to 18 s and stopped in 2 to 6 s. Preferably, the operation is performed in 10 s and stopped in 5 s. The operation time of the drainage pump 4 in step a is shortened, and many molded foams are discharged from the washing machine by pumping to enhance the defoaming effect. The set water injection time is 30 to 60 s.

  c. When the rotational speed of the inner cylinder is detected, it is determined whether or not the rotational speed of the inner cylinder has reached the first rotational speed, and the rotational speed of the inner cylinder has reached the first rotational speed, the low speed dewatering step If the rotation speed of the inner cylinder is smaller than the first rotation speed, the defoaming mode is executed, and then step a is continued.

  In the defoaming mode, the motor is controlled so as to reduce the rotation of the inner cylinder to a predetermined distribution rotation speed, and then the washing machine is injected with water for a certain period of time, and the drainage pump is operated intermittently.

  In this step, when the motor drives the inner cylinder and rotates rapidly, the water adsorbed on the laundry in the inner cylinder and the adhering bubbles are pushed out, and many bubbles obstruct the rotation of the inner cylinder, and the rotation speed As the generated resistance increases, the motor needs to output more power at that time, and after the output power of the motor reaches the upper limit value, the rotation speed of the inner cylinder cannot be further increased. At that time, the actual rotational speed may not reach the predetermined rotational speed. After passing the defoaming mode of step b, many bubbles may remain, but the water level cannot be detected. The maximum rotation speed of the inner cylinder is detected to determine whether or not the maximum rotation speed of the inner cylinder reaches the first rotation speed, and it is determined whether or not the bubbles exceed a predetermined value. Furthermore, it is determined whether or not the foam exceeds a predetermined value by detecting the increased speed, and prevents the foam from exceeding the predetermined value and the foam overflowing value. Avoid increasing the load due to increased foam and causing some damage to the motor.

  In this embodiment, after the low-speed dewatering step is completed, the motor is driven to reduce the inner cylinder to a predetermined rotational speed, and the high-speed dewatering step is performed. The high-speed dewatering step is as follows.

  A. The motor is controlled so that the inner cylinder raises the rotational speed to perform dehydration, and the drainage pump is operated intermittently, and the maximum rotational speed of the inner cylinder during high-speed dewatering is set as the second rotational speed.

  In this step, the second rotation speed is set to 800 to 1000 rpm, that is, the maximum rotation speed of the inner cylinder is set to 800 to 1000 rpm, and preferably the second rotation speed is set to 800 rpm. The intermittent operation of the drainage pump 4 is installed as follows, that is, operated at 12 to 18 s and stopped at 4 to 6 s. Preferably, it is operated in 15 s and stopped in 5 s.

  As the motor rotates the inner cylinder to further increase the rotation speed, the water adsorbed on the laundry in the inner cylinder is further scattered. Many bubbles are discharged by the intermittent operation of the drainage pump 4.

  B. When it is determined whether the foam in the washing machine exceeds a predetermined value by detecting whether the inner cylinder has reached the second rotation speed within a predetermined time, and the foam does not exceed the predetermined value The high-speed dewatering step is terminated, the motor is stopped, and when the foam exceeds a predetermined value, the defoaming mode is performed, and then step A is continuously executed.

  In the defoaming mode, the motor is controlled so as to reduce the rotation speed of the inner cylinder to a predetermined distribution rotation speed, and then water is poured into the washing machine for a predetermined time, water is poured, and the drainage pump is operated intermittently.

  In this step, installation is performed so as to measure that the rotational speed of the inner cylinder reaches from 400 rpm to 800 rpm within a set time of 3 to 8 seconds. By detecting whether or not the second rotational speed is reached within the set time, it is detected whether or not the foam in the high speed dewatering step exceeds a predetermined value.

  In the present embodiment, the high-speed dehydration step is followed by a dehydration step for a predetermined time, and the predetermined time dehydration step controls the activation of the motor so that the inner cylinder performs dehydration by increasing the rotation speed to the third rotation speed. At the same time, the drain pump 4 is operated intermittently. After it is detected that the dehydration has reached the predetermined time for a predetermined time, the motor is stopped, the drain pump 4 is closed, the drain valve 5 is closed, and the drainage is terminated.

  The third rotation speed is 1100 to 1200 rpm, that is, the rotation speed of the inner cylinder is 1100 to 1200 rpm, and preferably the third rotation speed is 1200 rpm. The intermittent operation of the drainage pump 4 is installed as follows, that is, operated at 12 to 18 s and stopped at 4 to 6 s. Preferably, it is operated in 15 s and stopped in 5 s.

  By installing a dehydration step for a predetermined time, the degree of dehydration of the laundry inside the inner cylinder is further increased, and the drainage pump 4 continues to drain indirectly.

  As shown in FIGS. 5-6, it is a 3rd Example of the drainage method of the washing machine which concerns on this invention, The main differences with a 2nd Example are as follows. That is, the washing machine according to the present embodiment is a double drum washing machine and shares one drain pipe and a drain pump.

  As shown in FIG. 5, the washing machine is a double drum washing machine, and the washing machine includes a housing 1, a first washing system installed in the housing 1, and a second washing system, The washing system 1 includes an outer cylinder 2, an inner cylinder, a motor, and a drainage system having a drainage pipe 3, a drainage pump 4, and a drainage valve 5 communicated with the bottom of the outer cylinder 2. The outer cylinder 2 stores cleaning water, and the inner cylinder is disposed in the outer cylinder 2 and stores laundry. The drain pipe 3 has a bottom portion 31, a rising portion 32, and a free portion 33, the bottom portion 31 communicates with the bottom portion of the outer cylinder 2, the rising portion 32 is fixed on the housing 1, and the drainage pump 4 and drainage The valve 5 is installed in the bottom part 31 and pumps washing water to the rising part 32. The motor is fixed to the outer cylinder 2 and drives the rotation of the inner cylinder. The second washing system includes a second outer cylinder 6, a second drain pipe 7 communicated with the second outer cylinder 6, and a second drain valve 8 installed in the second drain pipe. Prepare. The second drain pipe 7 is connected to the bottom 31 between the drain pump 4 and the drain valve 5. Thus, the first washing system and the second washing system share the drainage pump 4, the rising portion 32 and the free portion 33 of the drainage pipe 3. Therefore, the two systems cannot drain simultaneously, and it is first necessary to determine whether or not the drain pump 4 is occupied.

  Next, the draining method of the double drum washing machine will be described mainly using the drainage of the washing system as an example. As shown in FIG. 6, it is a control flowchart diagram of the drainage method according to the present embodiment. The drainage method of the washing machine includes a step of determining whether or not to sequentially drain, a draining step, and a dehydrating step. Including.

  The step of determining whether or not to drain determines whether or not the drain pump 4 is activated for the second washing system, and if the drain pump 4 is occupied, it is necessary to wait. When the drain pump 4 is not occupied, the drain valve 5 is opened and the process proceeds to the discharge step.

  In the discharge step, the drain pump 4 is controlled so as to operate intermittently until the water level in the outer cylinder 2 reaches a predetermined discharge water level. In the dehydration step, the rotation of the motor is controlled to perform dehydration, and the drainage pump 4 is controlled to operate intermittently. In the intermittent operation of the drainage pump 4, the drainage pump 4 alternately operates and stops.

  When the drainage pump 4 is operated by controlling the drainage pump 4 to operate intermittently, the washing water in the outer cylinder 2 enters the drainage pipe 3, and the drainage pump 4 is pumped to raise the rising portion 32 of the drainage pipe 3. It is discharged through. When the drainage pump 4 stops, the washing water at the rising portion of the drainage pipe 3 is circulated under the action of gravity, and thus the drainage pump 4 operates alternately or stops to wash the rising portion. The water is intermittently refluxed, and the foam floating in the washing water is easily discharged from the washing machine, thereby improving the rinsing effect of the washing machine and preventing the foam from overflowing. Specifically, first, when the motor does not start, that is, when the inner cylinder is in a stationary state, the cleaning water in the outer cylinder 2 decreases as the cleaning water is smoothly drained. At that time, the washing water at the rising portion intermittently recirculates and collides with the remaining washing water in the washing machine, causing a water wave on the washing water surface, and some bubbles on the washing water surface are caught in the drain pipe 4 and drained. When the pump 4 is operated, it is pumped to the rising portion and then discharged from the washing machine. Secondly, when there is little remaining washing water in the washing machine, the washing water cannot fill the lumen of the drainage pump 4, and if some air enters, the drainage pump 4 raises the washing water. Cannot be pumped to. As the washing water at the rising portion 32 is continuously refluxed, the washing water pushes the air in the drainage pump 4, the drainage pump 4 can continue to operate, and the bubbles float upward at the rising portion 32 of the drainage pipe 3. The foam first reaches the free end portion 33 and is discharged from the washing machine. Thereafter, the cleaning water is discharged, and when the drainage pump 4 stops, the cleaning water in the rising portion 32 is returned to the bottom portion 31. In this way, the foam is discharged from the washing machine, the washing water in the rising portion 32 is refluxed, and more foam is discharged.

  In the present embodiment, the intermittent operation of the drainage pump 4 is installed as follows, that is, operated at 12 to 18 s and stopped at 4 to 6 s. Preferably, it is operated in 15 s and stopped in 5 s.

  In the discharging step, it is determined whether or not the water level in the outer cylinder 2 reaches a predetermined discharged water level, the water level in the outer cylinder 2 is detected, and the detection result is compared with the predetermined discharged water level. When the detection result is higher than the predetermined drainage water level, the drainage pump 4 is continuously operated intermittently. When the detection result is equal to or smaller than the predetermined drainage water level, the drainage pump 4 is stopped and the draining step is ended.

  The discharged water level can be set according to the type of washing machine, and in general, the discharged water level is set to the water level at the bottom of the outer cylinder 2, that is, the water level in the outer cylinder 2 has reached the bottom of the outer cylinder 2. Is detected, the discharge step ends, and then the process proceeds to the next step.

  In this embodiment, after the discharging step is a load balancing step, and the load balancing step is to control the motor so that the inner cylinder rotates according to a predetermined distribution rotational speed. When the rotational speeds at a plurality of locations on the motor shaft are detected and compared with the predetermined distributed rotational speeds, respectively, the difference values between the detected rotational speed and the predetermined distributed rotational speed are all within a predetermined range. The laundry distribution becomes uniform and the load balancing step is terminated. If the difference value is not within the predetermined range, the laundry distribution in the inner cylinder becomes non-uniform, and the load balancing step is continued.

  In this embodiment, the distribution rotation speed is 90 to 100 rpm, that is, the rotation speed of the inner cylinder is 90 to 100 rpm, preferably 93 to 95 rpm, and more preferably 95 rpm.

  In order to prevent large vibrations from being generated in the dewatering step due to uneven load distribution, the laundry in the inner cylinder is redistributed by controlling the motor so that the inner cylinder rotates according to a predetermined distribution rotational speed. Further, it is determined whether or not the load is uniformly distributed based on the detected change in the rotational speed of the motor shaft.

  In the present method, the dewatering step includes a low speed dewatering step, a high speed dewatering step, and a predetermined time dewatering step. The slow dewatering step is as follows:

  a. The motor is controlled such that the inner cylinder raises the rotational speed to perform dehydration, and the drainage pump is operated intermittently, and the maximum rotational speed of the inner cylinder at the time of low-speed dewatering is set as the first rotational speed.

  In this step, the first rotation speed is 350 to 450 rpm, and preferably the first rotation speed is 400 rpm. That is, the rotational speed of the motor is controlled so as to increase from the distributed rotational speed. The intermittent operation of the drainage pump 4 is operated in 12 to 18 s and stopped in 4 to 6 s. Preferably, it is operated in 15 s and stopped in 5 s.

  b. By detecting the water level in the outer cylinder 2, it is determined whether or not the foam in the washing machine exceeds a predetermined value. If the foam does not exceed the predetermined value, step c is executed, and the foam exceeds the predetermined value. If yes, execute the defoaming mode, and then continue with step a.

  In the defoaming mode, the motor is controlled so as to reduce the rotation speed of the inner cylinder to a predetermined distribution rotation speed, and then water is poured into the washing machine for a predetermined time, water is poured, and the drainage pump is operated intermittently.

  By detecting the water level, it is determined whether or not the foam exceeds a predetermined value, and at the time of low-speed dewatering, the motor increases the rotation speed of the inner cylinder, and the laundry in the washing machine enters a saturated water absorption state. The washing water of the washing machine can be scattered, and the rapid rotational movement can increase the accumulation of bubbles in the washing machine so that the detected water level rises.

  In this step, it is determined whether or not the bubbles in the outer cylinder 2 exceed a predetermined value by detecting the water level in the outer cylinder 2 and comparing the detection result with a predetermined bubble water level. When the detected water level in the outer cylinder is equal to or higher than the predetermined bubble water level, it is determined that the bubbles in the outer cylinder are larger than the predetermined value. The bubble water level can be set to the water level at the lower end of the inner cylinder.

  In the defoaming mode, by driving the motor to reduce the rotational speed of the inner cylinder, firstly, the bubbles are prevented from overflowing due to the continuous increase of the bubbles during the rapid rotation. The increase in foam causes the load to become excessive and damages the motor itself. Secondly, by avoiding water injection, partially formed foam is eliminated, but it is directly scattered without being sufficiently in contact with the laundry and discharged from the washing machine. Thirdly, the speed of distribution is reduced by the detergent driven by the motor driving the rotation of the inner cylinder so that the laundry in the inner cylinder is sufficiently brought into contact with water injection, absorbed, washed and adsorbed on the laundry. The foam part is removed and discharged through a washing water pump. In this way, not only can the foam formed inside the washing machine be eliminated, it can also serve as a rinse of the laundry, reducing the amount of foam that can be formed in the washing machine, and the foam is again predetermined. Avoid exceeding the value as much as possible.

  In the defoaming mode, the intermittent operation of the drainage pump 4 is installed as follows, that is, operated in 12 to 18 s and stopped in 2 to 6 s. Preferably, the operation is performed in 10 s and stopped in 5 s. Compared to the operation time of the drainage pump 4 in step a, many foams formed and discharged from the washing machine by pressure feeding enhance the defoaming effect. The set water injection time is 30 to 60 s.

  c. When the rotational speed of the inner cylinder is detected, it is determined whether or not the rotational speed of the inner cylinder has reached the first rotational speed, and the rotational speed of the inner cylinder has reached the first rotational speed, the low speed dewatering step If the rotation speed of the inner cylinder is smaller than the first rotation speed, the defoaming mode is executed, and then step a is continued.

  In the defoaming mode, the motor is controlled so as to reduce the rotation of the inner cylinder to a predetermined distribution rotation speed, and then the washing machine is injected with water for a certain period of time, and the drainage pump is operated intermittently.

  In this step, when the motor drives the inner cylinder and rotates rapidly, the water adsorbed on the laundry in the inner cylinder and the adhering bubbles are pushed out, and many bubbles obstruct the rotation of the inner cylinder, and the rotation speed As the generated resistance increases, the motor must output more power at that time, and after the motor output power reaches the upper limit, the rotation speed of the inner cylinder cannot be further increased. At that time, the actual rotational speed may not reach the predetermined rotational speed. After passing the defoaming mode of step b, many bubbles may remain, but the water level cannot be detected. The maximum rotation speed of the inner cylinder is detected to determine whether or not the maximum rotation speed of the inner cylinder reaches the first rotation speed, and it is determined whether or not the bubbles exceed a predetermined value. Furthermore, by detecting the increased rotational speed, it is determined whether or not the foam exceeds a predetermined value, preventing the foam from exceeding a predetermined value or becoming a value at which the foam overflows. In order to avoid increasing the load and causing some damage to the motor.

  In this embodiment, after the low-speed dewatering step is completed, the motor is driven to reduce the inner cylinder to a predetermined rotational speed, and the high-speed dewatering step is performed. The high-speed dewatering step is as follows.

  A. The motor is controlled so that the inner cylinder raises the rotation speed to perform dehydration, and the drainage pump is operated intermittently, and the maximum rotation speed of the inner cylinder during high-speed dewatering is set as the second rotation speed.

  In this step, the second rotation speed is set to 800 to 1000 rpm, that is, the maximum rotation speed of the inner cylinder is set to 800 to 1000 rpm, and preferably the second rotation speed is set to 800 rpm. The intermittent operation of the drainage pump 4 is installed as follows, that is, operated at 12 to 18 s and stopped at 4 to 6 s. Preferably, it is operated in 15 s and stopped in 5 s.

  As the motor rotates the inner cylinder to further increase the rotation speed, the water adsorbed on the laundry in the inner cylinder is further scattered. Many bubbles are discharged by the intermittent operation of the drainage pump 4.

  B. By detecting whether or not the inner cylinder has reached the second rotational speed within a predetermined time, it is determined whether or not the foam in the washing machine exceeds a predetermined value, and the foam exceeds the predetermined value. If not, the high-speed dewatering step is terminated, the motor is stopped, and if the foam exceeds a predetermined value, the defoaming mode is performed, and then step A is continued.

  In the defoaming mode, the motor is controlled so as to reduce the rotation speed of the inner cylinder to a predetermined distribution rotation speed, and then water is poured into the washing machine for a predetermined time, water is poured, and the drainage pump is operated intermittently.

  In this step, installation is performed so as to measure that the rotational speed of the inner cylinder reaches from 400 rpm to 800 rpm within a set time of 3 to 8 seconds. By detecting whether or not the second rotational speed is reached within the set time, it is detected whether or not the foam in the high speed dewatering step exceeds a predetermined value.

  In the present embodiment, the high-speed dehydration step is followed by a dehydration step for a predetermined time, and the predetermined time dehydration step controls the activation of the motor so that the inner cylinder performs dehydration by increasing the rotation speed to the third rotation speed. At the same time, the drain pump 4 is operated intermittently. After it is detected that the dehydration has reached the predetermined time for a predetermined time, the motor is stopped, the drain pump 4 is closed, the drain valve 5 is closed, and the drainage is terminated.

  The third rotation speed is 1100 to 1200 rpm, that is, the maximum rotation speed of the inner cylinder is 1100 to 1200 rpm, and preferably the third rotation speed is 1200 rpm. The intermittent operation of the drainage pump 4 is installed as follows, that is, operated at 12 to 18 s and stopped at 4 to 6 s. Preferably, it is operated in 15 s and stopped in 5 s.

  By installing a dehydration step for a predetermined time, the degree of completion of dehydration of the laundry inside the inner cylinder is further increased, and the drainage pump 4 continues to indirectly drain.

  What has been described above are preferred embodiments of the present invention, and are not intended to limit the present invention in other forms, and those skilled in the art will recognize equivalent embodiments that are equivalent to the technical contents disclosed above. It can be changed or transformed. Without departing from the content of the technical solution of the present invention, how easily the above-mentioned embodiment is modified based on the substantial technology of the present invention, and equivalent changes and variations still remain the protection of the technical solution of the present invention. Belongs to a range.

Claims (10)

A washing machine draining method, wherein the washing machine includes an outer cylinder for storing washing water, an inner cylinder disposed in the outer cylinder, a motor for driving rotation of the inner cylinder, and a bottom portion of the outer cylinder A drainage system having at least a drainage pipe and a drainage pump communicated with the upper drainage washing machine,
The drainage method is:
A discharge step for controlling the drainage pump to operate intermittently until the water level in the outer cylinder reaches a predetermined discharge water level;
And a dehydrating step of controlling the motor so as to perform dewatering by rotating the inner cylinder and controlling the drainage pump so as to intermittently operate.   The drainage method for a washing machine according to claim 1, wherein the intermittent operation of the drainage pump is operated for 10 to 20 seconds and stopped for 2 to 10 seconds.   A load balancing step is further included between the discharging step and the dewatering step. The load balancing step controls the motor so that the inner cylinder rotates according to a predetermined distribution rotational speed, and detects the detected rotation of the inner cylinder. 2. The washing machine draining method according to claim 1, wherein whether or not the laundry in the inner cylinder is uniformly distributed is determined based on a change in speed.   The load balancing step detects rotational speeds at a plurality of locations on the rotating shaft of the inner cylinder, and compares each with a predetermined distributed rotational speed, and all the difference values between the detected rotational speed and the predetermined distributed rotational speed are all If it is within a predetermined range, the distribution of the laundry in the inner cylinder is balanced, the load balancing step is terminated, and if the difference value is not within the predetermined range, the distribution of the laundry in the inner cylinder is 4. The washing machine draining method according to claim 3, wherein the load balancing step is continuously executed because of unbalance. The dewatering step includes a slow dewatering step, and the slow dewatering step is as follows:
a. While controlling the motor so that the inner cylinder increases the rotation speed and performs dehydration, the drain pump is operated intermittently,
The maximum rotation speed of the inner cylinder at the time of low speed dewatering is set as the first rotation speed,
b. By detecting the water level in the outer cylinder, it is determined whether or not the foam in the washing machine exceeds a predetermined value, and if the foam does not exceed the predetermined value, execute step c,
If the foam exceeds the predetermined value, perform the defoaming mode, then continue with step a,
In the defoaming mode, the motor is controlled so as to reduce the rotational speed of the inner cylinder to the predetermined distribution rotational speed, and then water is poured into the washing machine at a predetermined time, water is poured and the drainage pump is intermittently operated.
c. The rotational speed of the inner cylinder is detected, it is determined whether the rotational speed of the inner cylinder has reached the first rotational speed, and the rotational speed of the inner cylinder has reached the first rotational speed. If the low-speed dewatering step is terminated,
The said defoaming mode is performed when the rotational speed of the said inner cylinder is smaller than the said 1st rotational speed, Then, the said step a is continued and it performs any one of Claims 1-4 characterized by the above-mentioned. The drainage method of the washing machine as described in 2.   6. The draining method for a washing machine according to claim 5, wherein the intermittent operation of the drain pump in the defoaming mode is operated for 8 to 12 s and stopped for 2 to 6 s. In step b, by detecting the water level in the outer cylinder and comparing the detection result with a predetermined bubble water level, it is determined whether or not the bubbles in the outer cylinder exceed the predetermined value,
6. The detected water level in the outer cylinder is equal to the predetermined bubble water level or higher than the predetermined bubble water level, and it is determined that the bubbles in the outer cylinder have exceeded the predetermined value. The drainage method of the washing machine as described in 2. The dewatering step further includes a high speed dewatering step after the low speed dewatering step, wherein the high speed dewatering step is as follows:
A. While controlling the motor so that the inner cylinder increases the rotation speed and performs dehydration, the drain pump is operated intermittently,
The maximum rotation speed of the inner cylinder at the time of high speed dewatering is set as the second rotation speed,
B. Determining whether or not the foam in the washing machine exceeds a predetermined value by detecting whether or not the rotational speed of the inner cylinder has reached the second rotational speed within a predetermined time;
If the foam does not exceed the predetermined value, terminate the high speed dewatering step, stop the motor,
If the foam exceeds the predetermined value, perform a defoaming mode, then continue to perform step A,
In the defoaming mode, the motor is controlled so as to reduce the rotation speed of the inner cylinder to the predetermined distribution rotation speed, and then water is poured into the washing machine for a predetermined time, water is poured, and the drainage pump is operated intermittently. The method for draining a washing machine according to claim 4. The dewatering step further includes a dewatering step for a predetermined time after the high-speed dewatering step, and the predetermined time dewatering step controls the motor so that the inner cylinder performs dewatering by increasing a rotation speed to a third rotation speed. And intermittently operating the drainage pump,
8. The washing machine draining method according to claim 7, wherein the motor is stopped and the drain pump is turned off after detecting that the dehydration has reached the predetermined time. The washing machine is a double drum washing machine and includes a second washing system, and the second washing system includes a second outer cylinder, a second drain pipe communicated with the second outer cylinder, A second drain valve installed on the second drain pipe,
The drain pipe has a bottom part, a rising part, and a free part, the bottom part communicates with the outer cylinder, a drain valve and a drain pump are installed on the bottom part, and the second drain pipe is the drain pipe Connected to the bottom between a valve and the drainage pump;
The drainage method further includes an occupation determination step of determining whether the drain pump or the drain pipe is operated for another washing system before the drain step, and the drain pump is occupied The draining method for a washing machine according to any one of claims 1 to 4 and claim 6 to 9, characterized in that it is necessary to wait.