WO2021143507A1

WO2021143507A1 - Washing machine and control method therefor

Info

Publication number: WO2021143507A1
Application number: PCT/CN2020/140601
Authority: WO
Inventors: 徐杰; 方大丰; 王艳鹏; 孙华海
Original assignee: 青岛海尔洗衣机有限公司; 海尔智家股份有限公司
Priority date: 2020-01-17
Filing date: 2020-12-29
Publication date: 2021-07-22
Also published as: CN113136688B; CN113136688A

Abstract

A control method for a washing machine. When a water outlet hole (11) arranged at an inner drum (1) is opened and a drainage process is executed, waste wash water contained in the inner drum (1) flows to an outer drum (2) via the water outlet hole (11), and then the waste wash water is drained via a drainage pipe (3) in communication with the outer drum (2). Detection is performed on a water level in the outer drum (2). When the water level in the outer drum (2) exceeds a preset water level, the water outlet hole (11) is closed. The above arrangement ensures that a washing machine can operate normally while preventing occurrence of an internal overflow in the washing machine, thereby protecting an internal structure of the washing machine, and extending service life of the washing machine. Moreover, multiple types of alarms are used to inform a user of a blockage and a degree of the blockage in a washing process performed by a washing machine, such that the user can make a timely check and resolve the blockage. The washing machine has a simple structure and enhanced operability.

Description

Washing machine and control method thereof

Technical field

The invention belongs to the technical field of washing machine devices, and specifically relates to a washing machine and a control method of the washing machine.

Background technique

Most of the pulsator washing machines in the prior art are composed of two circular inner and outer tubs. Only the inner and outer tubs are nested together for washing. During the washing process, water flows back and forth between the inner and outer tubs. As a result, dirt in the water and impurities on the clothes are attached to the wall of the inner tub. In addition, the environment of the washing machine is usually humid. The impurities attached to the wall of the inner tub will breed a lot of bacteria. If this happens, the inner tub looks very dirty and During the washing process, not only the clothes cannot be washed, but also the clothes are easily polluted. Therefore, users need to clean the inner bucket regularly to ensure that the inner bucket looks relatively clean, but the impurities, bacteria, and bacteria attached to the outer wall of the inner bucket It may not be completely cleaned up.

In order to solve the above-mentioned problems, a number of washing machines have been developed accordingly, such as a washing machine that cleans the inner and outer tubs at the same time during the washing process, or a washing machine with no water between the tubs, so that the inner and outer tubs are isolated. State, cut off the conditions for the generation of dirt between the tubs, and achieve zero cleaning. Until recently, the non-porous inner tub washing machine developed completely solved this problem.

However, if the drain pipe hangs or the drain pipe is blocked during the drainage of the non-porous inner tub washing machine, because the height of the outer tub is very low, it is very easy to happen that the water discharged from the inner tub cannot be discharged through the drain pipe, and the water in the outer tub becomes more and more. Many, the case of overflowing the outer barrel in the end is likely to cause flooding and other situations.

In view of this, the present invention is proposed.

Summary of the invention

The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a washing machine to achieve the purpose of controlling the timely closing of the water outlet when the drain pipe is blocked or suspended; the second object of the present invention is to provide a washing machine The control method is to realize the purpose of timely closing the water outlet and issuing an alarm in the case of a drainage failure of the drainage pipe.

In order to solve the above technical problems, the basic idea of the technical solution adopted by the present invention is:

A control method of a washing machine. The water outlet is opened and the drain procedure is executed. The washing water contained in the inner tub flows into the outer tub through the water outlet provided on the inner tub, and is discharged through the drain pipe connected with the outer tub to control the water level in the outer tub. Detection, when the detected value of the water level in the outer bucket exceeds the preset water level, the water outlet is closed.

Further, when the washing machine executes the washing procedure, the water outlet hole of the inner tub is closed, and the inner tub forms a water container for the washing water.

Furthermore, a preset first water level is set on the outer barrel at a height h1 from the bottom surface of the outer barrel. If it is detected that the water level in the outer barrel is lower than the first water level, the water outlet remains open; if it is detected that the water level in the outer barrel is lower than the first water level. Water level, the water outlet is closed.

Furthermore, after the water outlet is closed, if the water level in the outer bucket continues to be higher than the first water level for longer than t1, a water overflow alarm is issued.

Further, a second water level is preset on the outer barrel at a height h2 from the bottom surface of the outer barrel, and when the water level in the outer barrel is higher than the second water level, an overflow alarm is issued.

Furthermore, after the water outlet is closed, if the water level in the outer bucket drops below the first water level within t1, but the emptying water level for completely emptying the water in the outer bucket is not reached within t2, a drain will be issued. Timeout alert.

Further, after the water outlet is closed, the water level in the outer bucket reaches the emptying water level within t1, and the water outlet is opened.

A method for controlling a washing machine includes the following steps:

Step S1: the water outlet hole is opened, and the washing water in the inner tub flows into the outer tub through the water outlet hole and is discharged through the drain pipe;

Step S2: Detect the water level in the outer barrel, and determine whether the water level reaches the first water level, continue to drain if the water level does not reach the first water level, and close the water outlet if it reaches the first water level;

Step S3: After closing the water outlet, if the water level in the outer barrel is continuously higher than the first water level for longer than t1 and/or the water level in the outer barrel is higher than the second water level, then step S31 is executed; if the water level in the outer barrel is at If it drops below the first water level within t1, but has not reached the emptying level for completely emptying the water in the outer bucket within t2, then step S32 is executed; if the water level in the outer bucket reaches the emptying level within t1 , Then execute step S33;

Step S31: Keep the water outlet closed and issue an overflow alarm;

Step S32: Keep the water outlet closed and issue a drain overtime alarm;

Step S33: The water outlet is opened, and the inner bucket continues to drain.

A washing machine includes an inner tub that forms an inner tub for a water container when the washing machine executes a washing procedure; an outer tub is arranged outside the inner tub, and the inner tub is provided with water outlet holes for washing water to flow to the outer tub, and the water outlet holes are installed to control its opening and closing The control valve; the outer barrel is equipped with a water level detection device to detect the height of the water level in the outer barrel.

Further, the top of the outer barrel is higher than the bottom of the inner barrel, and the bottom of the outer barrel is lower than the bottom of the inner barrel.

Furthermore, the top of the outer barrel is lower than half of the height of the inner barrel.

Further, the control method of the above-mentioned washing machine is applied.

Using a pair of washing machines in this application to wash clothes can ensure that the washing machine is working normally without overflowing inside the washing machine, protect the internal structure of the washing machine, extend the life of the washing machine, and notify the user that the washing machine is washing through a variety of alarm methods The blockage in the process and the degree of blockage remind the user to check and solve the blockage problem, and the structure of this scheme is simple and the operability is strong.

The specific embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.

Description of the drawings

The accompanying drawings are used as a part of the present invention to provide a further understanding of the present invention. The exemplary embodiments of the present invention and the description thereof are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the drawings in the following description are only some embodiments, and for those of ordinary skill in the art, other drawings can be obtained from these drawings without creative work. In the attached picture:

Figure 1 is a schematic diagram of the internal structure of a washing machine in an embodiment of the present invention;

Figure 2 is a flowchart of a washing machine control method in an embodiment of the present invention;

Figure 3 is a logic diagram of a washing machine control method in an embodiment of the present invention;

Description of the reference numerals in the drawings: 1. Inner barrel; 11. Water outlet; 12; Control valve 2. Outer barrel; 21. First water level; 22. Second water level; 3. Drain pipe.

It should be noted that these drawings and text descriptions are not intended to limit the scope of the present invention in any way, but to explain the concept of the present invention for those skilled in the art by referring to specific embodiments.

Detailed ways

In order to make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be described clearly and completely in conjunction with the accompanying drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention. , But not used to limit the scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the pointed device or element must have a specific orientation or a specific orientation. The structure and operation cannot therefore be understood as a limitation of the present invention.

In the description of the present invention, it should be noted that the terms "installed", "connected", and "connected" should be understood in a broad sense unless otherwise clearly specified and limited. For example, they can be fixed or detachable. Connected or integrally connected; it can be mechanically or electrically connected; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above-mentioned terms in the present invention can be understood under specific circumstances.

As shown in Figure 1, this embodiment introduces a washing machine, which includes an inner tub 1, which forms an inner tub 1 for a water container when the washing machine executes a washing procedure; an outer tub 2 is provided outside the inner tub 1, and an inner tub 1 is provided for washing Water flows to the water outlet 11 of the outer tub 2. A control valve 12 is installed at the outlet 11 to control its opening and closing. The outer tub is equipped with a water level detection device for detecting the water level in the outer tub. The washing machine detects the water level through the water level detection device. The height of the water outlet 11 is controlled by the control valve 12, and the closing of the water outlet 11 is controlled by the control valve 12 to prevent the washing water from draining from the inner tub 1 to the outer tub 2. The bottom surface of the outer tub 2 is connected with a drain pipe 3 to discharge water. When the hole 11 is opened, the inner tub 1, the outer tub 2 and the drain pipe 3 are connected. The inner pipe diameter of the drain pipe 3 should be larger than the diameter of the water outlet hole 11. When the washing machine is draining water, the washing machine opens the water outlet hole 11 through the control valve 12, The washing water in the inner tub 1 flows into the outer tub 2 through the water outlet 11 and is discharged along the drain pipe 3. When the drain pipe 3 is hung up or the drain pipe 3 is blocked, the water cannot flow smoothly from the drain pipe 3. The water in the outer tub 2 will accumulate more and more, and because the height of the outer tub 2 is much lower than the height of the inner tub 1, the water in the outer tub 2 will quickly overflow the outer tub 2, causing the washing machine to overflow and the inside of the washing machine Soaked in water, because there are a lot of debris in the washing water, if the user does not clean it in time, it is easy to cause corrosion to the internal structure and shell of the washing machine. At the same time, the washing water flowing out of the washing machine will also pollute the surrounding environment. The user cleans it up. Through the water level detection device set on the outer tub 2, the washing machine can monitor the water level in the outer tub 2 in real time, and open or close the water outlet 11 in a timely manner to prevent the washing water from draining from the inner tub 1 to the outer tub 2. In the middle, cut off the source of water flow in the outer barrel 2 to avoid overflow.

As shown in Figure 1, in this embodiment, the top of the outer barrel 2 is higher than the bottom of the inner barrel 1, the bottom of the outer barrel 2 is lower than the bottom of the inner barrel 1, the top of the outer barrel 2 is lower than half of the height of the inner barrel 1, and the top of the outer barrel 2 is higher than the inner barrel. 1 The bottom and the bottom of the outer tub 2 are lower than the bottom of the inner tub 1, avoiding splashing when the water discharged from the water outlet 11 falls into the outer tub 2, and splashing out of the outer tub 2, which will damage the internal structure of the washing machine after a long time. At the same time, the height of the outer barrel 2 should not be too high, to avoid that when the drain pipe 3 is blocked, the water inside the outer barrel 2 is too high, soaking the outer wall of the inner barrel 1, while the outer wall of the inner barrel 1 is not easy to clean, and it is easy to breed after a long time. A lot of bacteria.

As shown in Figure 1, in this embodiment, a first water level 21 is set at a height h1 from the bottom surface of the outer tub 2. The function of the outer tub 2 is to prevent the drain pipe 3 from being directly connected to the water outlet 11 and rotating the inner tub 1 During the process, the drain pipe 3 rotates with the inner tub 1 and shakes accordingly, connecting the drain pipe 3 to the fixed outer tub 2. Since the outer tub 2 is fixed, the drain pipe 3 is fixed during the washing process of the washing machine. 3 will not rotate. During the draining process, since the bottom of the inner tub 1 extends into the opening of the outer tub 2, the water flowing out of the outlet hole 11 falls into the outer tub 2, and the splashed water is absorbed by the outer tub 2. The side wall of the washing machine is intercepted and will not splash out of the outer tub 2 due to the height difference between the inner tub 1 and the outer tub 2, which further ensures that the inside of the washing machine will not be corroded by the washing water.

As shown in Figure 1, in this embodiment, the height h1 of the first water level 21 is less than the distance between the bottom of the inner tub 1 and the bottom surface of the outer tub 2. Since the bottom of the inner tub 1 extends into the opening of the outer tub 2, if h1 is greater than The distance between the ground of the inner tub 1 and the bottom surface of the outer tub 2. During the drainage process, if the drain pipe 3 is hung or blocked, causing poor drainage, the washing water level in the outer tub 2 will become higher and higher. When the washing water has submerged the bottom of the inner tub 1 and soaked for a long time, it will corrode the outer wall of the inner tub 1, and the outer wall of the inner tub 1 is extremely difficult to clean. The user can find the residual dirt on the inner wall of the inner tub 1 during use, but the inner tub cannot be observed. 1 Residual stains on the outer wall, bacteria and other impurities on the clothes adhere to the outer wall of the inner tub 1, and it is easy to damage the outer wall of the inner tub 1 for a long time, so the height h1 of the first water level 21 is smaller than the bottom of the inner tub 1 to the bottom of the outer tub 2 When the water level in the outer bucket 2 does not reach the first water level 21, continue to drain, even if the drain pipe 3 is hung or blocked, causing poor drainage, the water level rises slowly, and when it reaches the first water level 21 , The washing machine controls the water outlet 11 to close to prevent the washing in the outer tub 2 from surpassing the bottom of the inner tub 1, further extending the life of the washing machine and reducing the failure rate of the washing machine.

In this embodiment, a method for controlling a washing machine is introduced.

Including the following steps

Step S1: The washing machine starts to drain water and opens the water outlet. The water in the inner tub 1 flows into the outer tub 2 through the water outlet 11 and is discharged through the drain pipe 3;

Step S2: the water level detection device is activated and detects the water level in the outer barrel 2;

Step S3: If the water level in the outer tub 2 reaches the highest height of the outer tub 2, the water level signal is fed back to the washing machine, and the washing machine controls the water outlet 11 to close.

If the water level in the outer tub 2 exceeds the highest height of the outer tub 2, it means that the drain pipe 3 is hung or blocked, causing the washing water in the outer tub 2 to be unable to drain smoothly. The water level exceeds the maximum height of the outer tub 2, that is, it will overflow the outer tub 2. At this time, the water level is fed back to the washing machine, and the washing machine controls the water outlet 11 to close immediately to avoid greater losses. This is also the simplest In the technical solution, the water level in the outer barrel 2 is detected by a water level detection device, and the outlet hole 11 is closed when the water in the outer barrel 2 overflows. However, there are also certain technical defects, especially when the water outlet flow rate and/or the outlet hole 11 When the outlet water flow is too large, even if the water level detection device detects that the water in the outer tub 2 is about to overflow the outer tub 2 in time, the feedback of the water level signal and the washing machine controlling the water outlet valve 13 to close the water outlet 11 require certain operations. Time, so some water will overflow the outer bucket 2.

In this embodiment, in the above step S3, if the water level detecting device detects that the water level in the outer tub 2 is lower than the first water level 21, the water will continue to drain. Before the water level reaches the first water level 21, it is indicated that the drain pipe 3 can drain normally. The drain pipe 3 is not blocked, or even if the drain pipe 3 is blocked, the degree of blockage will not affect the drainage temporarily. Most of the water discharged from the water outlet hole 11 into the outer tub 2 can still be discharged through the drain pipe 3. There will be no excessive accumulation of water in the outer barrel 2, and no overflow in a short period of time. The water level in the outer barrel 2 can be maintained at a slower rate for a period of time, so it can be sustained Perform drainage work.

In this embodiment, in the above step S3, a second water level 22 is set on the outer tub 2 at a height h2 from the bottom surface of the outer tub 2, and the height h2 of the second water level 22 from the bottom surface of the outer tub 2 is higher than the first water level from the outer tub 2 The height h1 of the bottom surface. When the water level detecting device detects that the water level in the outer tub 2 is higher than the first water level 21 and lower than the second water level 22, the water level signal is fed back to the washing machine, and the washing machine controls the water outlet 11 to close, as in the above embodiment The water level that triggers the closing of the water outlet 11 of the washing machine is set as the water level in the outer tub 2 reaches the highest height, but in actual use, the water outlet 11 continues to drain the washing water. At this time, the drain pipe 3 completely loses its drainage function or The water level rise caused by partial loss of drainage function, even if the water level detection device detects that the water level reaches the highest height in the outer bucket 2, the water level height signal is fed back to the control board, and the control board controls the water outlet 11 to close the signal and the water outlet 11 to close , This series of work cannot be completed at the moment the water level is detected, so at this time the water level will rise partially, and the water in the outer bucket 2 will overflow the outer bucket 2. In order to avoid this situation, the first A water level 21 is set as the water level at which the washing machine controls the water outlet 11 to close, so as to further prevent the occurrence of water overflow.

The heights of the first water level 21 and the second water level 22 can be adjusted according to different types of washing machines. For example, the first water level 21 and the second water level 22 are set at one-third and two-thirds of the outer tub 2, respectively. And this height setting solution is that when the water level reaches the first water level 21, part of the water will be discharged into the outer bucket 2 when the water outlet 11 is closed, but the water level in the outer bucket 2 will not reach the second water level 22. It is further ensured that in the process of closing the water outlet 11, the water in the outer tub 2 will not overflow, and the setting of the second water level 22 is also to avoid the failure of the water level detection device and the failure to detect that the water level has reached the first water level 21 in time When the water level exceeds the second water level 22, if the water outlet 11 is not closed at this time, the washing machine controls the water outlet 11 to close. Similarly, when the water outlet 11 is closed again, the water level in the outer tub 2 rises. Similarly, it will not reach the highest height of the outer barrel 2, avoiding the overflow of water in the outer barrel 2, and further ensuring that the water in the outer barrel 2 will not overflow the outer barrel 2. The above example is only an implementation method, and the actual situation requires Make corresponding adjustments according to different models.

In this embodiment, after the water outlet 11 is closed, if the water level continues to be higher than the first water level 21 for a time greater than t1, an overflow alarm is issued. At this time, the water outlet 11 has been closed, and the washing water in the inner tub 1 will no longer be discharged The reason why the water level in the outer tub 2 does not drop slowly is that the drain pipe 3 is hung or the drain pipe 3 is completely blocked, causing the drain pipe 3 to fail to drain, and the washing water in the outer tub 2 has been accumulated in the outer tub 2 Or the drain pipe 3 is blocked very seriously. Even though a small part of the washing water in the outer tub 2 is discharged, but the amount of water discharged is too small, the water level is still above the first water level 21, and the water level is not It drops below the first water level 21 within t1. At this time, an overflow alarm is issued to the user, reminding the user that the water level in the outer bucket 2 is abnormal, and also reminding the user that the drain pipe 3 is hung up or completely blocked, and the drain is lost. In this case, the user needs to check whether the drain pipe 3 is suspended in time. If the drain pipe 3 is not in a suspended state, the user needs to check the blockage of the drain pipe 3 and unblock it in time.

In this embodiment, after the water outlet 11 is closed, if the water level in the flat outer tub 2 drops below the first water level within t1, but it has not reached the level of emptying all the water in the outer tub 2 within t2. When the water level is emptied, a drain overtime alarm is issued. At this time, the water outlet 11 is closed, and the washing water in the inner tub 1 will not be discharged into the outer tub 2. The drop of the water level indicates that the drain pipe 3 is not completely blocked. It also has a certain drainage function, but due to partial blockage, the drainage capacity is reduced, and the water flow is reduced. It is impossible to empty the washing water in the outer tub 2 in a short time. Therefore, the water level drops to the first within t1. The water level is below 21, but the emptying water level is not reached. At this time, a drain timeout alarm is issued to inform the user that the drain pipe 3 is normally connected to the sewer pipe, but it is partially blocked and needs to be cleaned and then continue to wash.

In this embodiment, after the water outlet 11 is closed, the water level in the outer tub 2 reaches the emptying level within t1, and the water level detection device feeds back the water level signal to the washing machine. The washing machine controls the water outlet 11 to open, and the water outlet 11 is in the closed state at this time. , The washing water in the inner tub 1 will not be discharged into the outer tub 2, and the water level in the outer tub 2 reaches the emptying level within t2, indicating that the blockage in the drain pipe 3 is not very serious, and it also has a certain drainage function. Therefore, after the washing machine controls the water outlet 11 to open and close multiple times, the water in the outer tub 2 can still be drained without overflowing, and it will not take too long.

In this embodiment, after the washing is finished, an alarm for the blockage of the drain pipe 3 is issued and displayed on the display panel of the washing machine to remind the user that the drain pipe 3 is slightly blocked. Although the blockage does not affect this wash, it is After being placed in the environment for a period of time, it is easy to breed more bacteria or produce peculiar smell. If it is blocked and enters the sewer pipe, it is more likely to cause the sewer pipe to be blocked. Therefore, the user needs to be reminded in time for cleaning.

In this embodiment, the water level detection device is a water level sensor. The water level sensor can realize the detection of the water level in the outer tub 2 and has a simple structure. However, the water level detection device in the present invention is not limited to the water level sensor. Any device that can detect the water level in real time and transmit the water level height signal as described above can be used.

As shown in Figure 2, this embodiment introduces a washing machine control method, which includes the following steps:

Step S1: the water outlet hole 11 is opened, and the washing water in the inner tub 1 flows into the outer tub 2 through the water outlet hole 11 and is discharged through the drain pipe 3;

Step S2: Detect the water level in the outer bucket 2 and determine whether the water level reaches the first water level 21, if the water level does not reach the first water level 21, continue to drain, and if it reaches the first water level 21, close the water outlet 11;

Step S3: After closing the water outlet 11, if the water level in the outer barrel 2 is continuously higher than the first water level 21 for longer than t1 and/or the water level in the outer barrel is higher than the second water level 22, then step S31 is executed; The water level in 2 drops below the first water level 21 within t1, but has not reached the emptying water level for emptying all the water in the outer tub 2 within t2, then step S32 is executed; if the outer tub within t1 When the water level in 2 reaches the emptying water level, step S33 is executed;

Step S31: the water outlet 11 is kept closed, and an overflow alarm is issued;

Step S32: the water outlet 11 is kept closed, and a drain overtime alarm is issued;

Step S33: the water outlet hole 11 is opened, and the inner tub 1 continues to drain water.

As shown in FIG. 3, this embodiment introduces the control method of the washing machine in the present invention in more detail with respect to the foregoing embodiment, and the specific steps are as follows:

Step S2: Detect the water level in the outer tub 2 and determine whether the water level reaches the first water level 21, if the water level does not reach the first water level 21, execute step S21, if it reaches the first water level 21, execute step S3;

Step S21: Continue to drain until the drain is completed;

Step S3: Close the water outlet;

Step S4: If the water level in the outer barrel 2 is continuously higher than the first water level 21 for longer than t1 and/or the water level in the outer barrel is higher than the second water level 22, step S41 is executed;

Step S5: If the water level in the outer tub 2 drops below the first water level 21 within t1, but the emptying water level for completely emptying the water in the outer tub 2 is not reached within t2, then step S51 is executed. ；

Step S6: If the water level in the outer tub 2 reaches the emptying water level within t1, step S61 is executed;

Step S41: the water outlet 11 is kept closed, and an overflow alarm is issued;

Step S42: The user needs to check whether the water outlet pipe 3 is hung or blocked, and correspondingly remove or unblock the drain pipe 3, start the drainage procedure again to drain water, and continue to perform step S1;

Step S51: The water outlet 11 is kept closed, and a drain overtime alarm is issued;

Step S52: The user can clearly know that the drain pipe 3 is slightly blocked by the alarm, remove the drain pipe 3 to dredge, and start the drain procedure again to drain, and continue to perform step S1;

Step S61: the water outlet 11 is opened, and the inner tub 1 continues to drain;

Step S7: The drainage ends.

According to the above-mentioned washing machine control method, according to different alarms, the user can clearly distinguish the cause that affects the smooth drainage of the washing machine, and solve the problem in a targeted manner, saving time to find the problem, and avoiding the overflow of water in the outer tub 2 happen.

The above are only preferred embodiments of the present invention, and do not limit the present invention in any form. Although the present invention has been disclosed in the preferred embodiments as above, it is not intended to limit the present invention. Anyone familiar with this patent is Without departing from the scope of the technical solution of the present invention, when the above-mentioned technical content can be used to make slight changes or modification into equivalent embodiments with equivalent changes, but any content that does not deviate from the technical solution of the present invention, the technical essence of the present invention Any simple modifications, equivalent changes and modifications made in the above embodiments still fall within the scope of the solution of the present invention.

Claims

A method for controlling a washing machine is characterized in that: the water outlet is opened and the drain procedure is executed, the washing water contained in the inner tub flows into the outer tub through the outlet provided on the inner tub, and is discharged through the drain pipe connected with the outer tub, and then is discharged into the outer tub. When the water level in the outer bucket exceeds the preset water level, the water outlet will be closed.
A washing machine control method according to claim 1, characterized in that: a first water level is preset on the outer tub at a height h1 from the bottom surface of the outer tub, and if it is detected that the water level in the outer tub is lower than the first water level, the water outlet Keep it open; if it is detected that the water level in the outer barrel is lower than the first water level, the water outlet will be closed.
The control method of a washing machine according to claim 2, wherein after the water outlet is closed, if the water level in the outer tub continues to be higher than the first water level for longer than t1, an overflow alarm is issued;

Preferably, a second water level is preset on the outer barrel at a height h2 from the bottom surface of the outer barrel, and when the water level in the outer barrel is higher than the second water level, an overflow alarm is issued.
The control method of a washing machine according to any one of claims 2 or 3, characterized in that: after the water outlet is closed, if the water level in the outer tub drops below the first water level within t1 time, but the water level is still not within t2 time When the emptying water level is reached to completely empty the water in the outer bucket, a drain overtime alarm will be issued.
The control method of a washing machine according to any one of claims 2 to 4, characterized in that: after the water outlet is closed, the water level in the outer tub reaches the emptying water level within t1, and the water outlet is opened.
A method for controlling a washing machine according to claims 2 to 5, characterized in that it comprises the following steps:

Step S1: the water outlet hole is opened, and the washing water in the inner tub flows into the outer tub through the water outlet hole and is discharged through the drain pipe;

Step S2: Detect the water level in the outer barrel, and determine whether the water level reaches the first water level, continue to drain if the water level does not reach the first water level, and close the water outlet if it reaches the first water level;

Step S3: After closing the water outlet, if the water level in the outer barrel is continuously higher than the first water level for longer than t1 and/or the water level in the outer barrel is higher than the second water level, then step S31 is executed; if the water level in the outer barrel is at If it drops below the first water level within t1, but has not reached the emptying level for completely emptying the water in the outer bucket within t2, then step S32 is executed; if the water level in the outer bucket reaches the emptying level within t1 , Then execute step S33;

Step S31: Keep the water outlet closed and issue an overflow alarm;

Step S32: Keep the water outlet closed and issue a drain overtime alarm;

Step S33: The water outlet is opened, and the inner bucket continues to drain.
A method for controlling a washing machine according to claim 1, wherein when the washing machine executes the washing process, the water outlet hole of the inner tub is closed, and the inner tub forms a water container for the washing water.
A washing machine includes an inner tub that forms an inner tub for a water container when the washing machine executes a washing procedure; an outer tub is arranged outside the inner tub, and the inner tub is provided with water outlet holes for washing water to flow to the outer tub, and the water outlet holes are installed to control its opening and closing The control valve; It is characterized in that: the outer barrel is provided with a water level detection device useful to detect the height of the water level in the outer barrel.
A washing machine according to claim 8, wherein the top of the outer tub is higher than the bottom of the inner tub, and the bottom of the outer tub is lower than the bottom of the inner tub;

Preferably, the top of the outer barrel is lower than half of the height of the inner barrel.
A washing machine according to claim 8, characterized in that: the control method according to any one of claims 1-7 is applied.