Defoaming method for washing equipment

Abstract

The present invention relates to the technical field of smart home, and specifically provides an antifoaming method for a washing device, aiming to solve the problem of unsatisfactory antifoaming effect of existing washing devices. The antifoaming method of the present invention includes the following steps: during the operation of the washing device, obtain the foam height in the washing tub; compare the foam height with a first preset warning height and a second preset warning height respectively; if the foam height is greater than the first preset warning height but less than the second preset warning height, obtain the current process stage of the washing device; according to the process stage, perform different antifoaming operations, which can anticipate in advance whether it is necessary to perform antifoaming treatment on the foam in the washing tub, avoid blocking the ventilation pipe due to a large amount of foam filling in the washing tub, can perform antifoaming treatment in a targeted manner, can quickly and effectively eliminate the foam in the washing tub, and ensure the normal operation of the washing device.

Description

Technical Field

[0001] The present invention relates to the technical field of smart home, and specifically provides an antifoaming method for a washing device. Background Art

[0002] A washing machine is a common household laundry washing device. Classified according to the washing method, washing machines can be roughly divided into pulsator washing machines and drum washing machines. Taking a drum washing machine as an example, usually, before the drum washing machine washes clothes, a corresponding amount of detergent needs to be added to the washing water. However, when an excessive amount of detergent is put into the drum washing machine, due to reasons such as stirring and water flow impacting the detergent, the air comes into continuous contact with the detergent, and excessive foam is easily generated. If not removed in time, a large amount of foam fills the washing tub, which will block the ventilation pipe, resulting in too high pressure inside the tub and thus inhibiting the water inlet of the drum washing machine; moreover, the foam filling the inner and outer tubs will also generate resistance, causing the motor to overheat due to overload, resulting in problems such as incomplete rinsing and foam residue, causing complaints from users.

[0003] To solve the above problems, in the prior art, when a large amount of foam fills the washing tub, the rotation of the washing tub is controlled to stop, and wait for the foam to disappear. However, the efficiency of the above antifoaming method is low, the measures are relatively lagging, and the foam cannot be effectively eliminated, reducing the user experience.

[0004] Therefore, there is a need in the art for a new antifoaming method for a washing device to solve the above problems. Summary of the Invention

[0005] To solve the above problems in the prior art, that is, to solve the problem of unsatisfactory antifoaming effect of existing washing devices, the present invention provides an antifoaming method for a washing device, the washing device includes a washing tub, and the antifoaming method includes the following steps: during the operation of the washing device, obtain the foam height in the washing tub; compare the foam height with a first preset warning height and a second preset warning height respectively; if the foam height is greater than the first preset warning height but less than the second preset warning height, obtain the current process stage of the washing device; according to the process stage, perform different antifoaming operations; wherein, the first preset warning height is less than the second preset warning height.

[0006] In the preferred technical solution of the above defoaming method, the step of "performing different defoaming operations according to the process stage" specifically includes: if the washing device is in the washing stage, reducing the rotation-stop ratio of the washing cylinder to a first rotation-stop ratio and / or canceling the agitation operation; after a first preset time, obtaining the foam height in the washing cylinder again; comparing the foam height obtained again with the first preset warning height and the first preset height respectively; controlling the washing device to selectively execute the remaining set procedures or continue to perform the defoaming operation according to the comparison result; wherein, the first preset height is greater than the first preset warning height but less than the second preset warning height, and the first preset height is greater than or equal to the foam height obtained last time.

[0007] In the preferred technical solution of the above defoaming method, the step of "controlling the washing device to selectively execute the remaining set procedures or continue to perform the defoaming operation according to the comparison result" specifically includes: if the foam height obtained again is greater than or equal to the first preset warning height but less than or equal to the first preset height, controlling the washing cylinder to continue running at the first rotation-stop ratio; reducing the emptying water level when the washing device performs the draining operation after the washing is over to a first preset emptying water level, and controlling the washing device to perform rotational draining operation when the washing device performs the draining operation; reducing the dehydration acceleration of the washing cylinder when the washing device performs the dehydration operation after the draining is over to a first preset acceleration, and / or reducing the maximum dehydration speed of the washing cylinder to a first preset speed.

[0008] In the preferred technical solution of the above defoaming method, the step of "controlling the washing device to selectively execute the remaining set procedures or continue to perform the defoaming operation according to the comparison result" further includes: if the foam height obtained again is greater than the first preset height, reducing the rotation-stop ratio of the washing device to a second rotation-stop ratio, wherein the second rotation-stop ratio is less than the first rotation-stop ratio; reducing the emptying water level when the washing device performs the draining operation after the washing is over to a second preset emptying water level, and controlling the washing device to perform rotational draining operation when the washing device performs the draining operation; reducing the dehydration acceleration of the washing cylinder when the washing device performs the dehydration operation after the draining is over to a second preset acceleration, and / or reducing the maximum dehydration speed of the washing cylinder to a second preset speed; after the washing device finishes dehydration, obtaining the set number of rinsing times of the washing device; judging whether the set number of rinsing times is less than a first preset number; if the set number of rinsing times is less than the first preset number, increasing the number of rinsing times; and / or if the set number of rinsing times is greater than or equal to the first preset number, not adjusting the number of rinsing times.

[0009] In the preferred technical solution of the above defoaming method, the step of "performing different defoaming operations according to the process stage" further includes: if the washing device is in the rinsing stage, reducing the rotation frequency of the washing drum to a preset rotation frequency; after a second preset interval, obtaining the foam height in the washing drum again; comparing the foam height obtained again with the first preset warning height and the second preset height respectively; according to the comparison result, selectively controlling the washing device to execute the remaining set program or continue to execute the defoaming operation; wherein, the second preset height is greater than the first preset warning height but less than the second preset warning height, and the second preset height is greater than or equal to the foam height obtained last time.

[0010] In the preferred technical solution of the above defoaming method, the step of "selectively controlling the washing device to execute the remaining set program or continue to execute the defoaming operation according to the comparison result" specifically includes: if the foam height obtained again is greater than or equal to the first preset warning height but less than or equal to the second preset height, controlling the washing drum to continue running at the preset rotation frequency; reducing the emptying water level when the washing device performs the draining operation after the rinsing is over to a third preset emptying water level; after the washing device finishes draining, controlling the washing device to perform a spray rinsing operation and controlling the washing device to perform a rotating draining operation; reducing the dehydration acceleration of the washing drum when the washing device performs the dehydration operation after draining to a third preset acceleration, and / or reducing the maximum dehydration speed of the washing drum to a third preset speed; after the washing device finishes dehydration, controlling the washing device to perform a spray rinsing operation again; after the washing device finishes the second spray rinsing, obtaining the remaining rinsing times of the washing device; judging whether the remaining rinsing times are greater than or equal to a second preset number of times; if the remaining rinsing times are greater than or equal to the second preset number of times, controlling the washing device to continue to perform the rinsing operation; and / or if the remaining rinsing times are less than the second preset number of times, controlling the washing device to end the operation.

[0011] In the preferred technical solution of the above defoaming method, the step of "selectively controlling the washing device to execute the remaining set program or continue to execute the defoaming operation according to the comparison result" further includes: if the foam height obtained again is greater than the second preset height, controlling the washing tub to stop rotating and causing the washing device to execute a drainage operation; after the drainage operation of the washing device is completed, controlling the washing device to execute a dehydration operation; after the dehydration operation of the washing device is completed, obtaining the remaining number of rinsing times of the washing device; determining whether the remaining number of rinsing times is less than a third preset number; if the remaining number of rinsing times is less than the third preset number, obtaining the set number of rinsing times of the washing device; determining whether the set number of rinsing times is less than a fourth preset number; if the set number of rinsing times is less than the fourth preset number, increasing the number of rinsing times.

[0012] In the preferred technical solution of the above defoaming method, the step of "selectively controlling the washing device to execute the remaining set program or continue to execute the defoaming operation according to the comparison result" further includes: if the remaining number of rinsing times is greater than or equal to the third preset number, controlling the washing device to continue to execute the rinsing operation; and / or if the set number of rinsing times is greater than or equal to the fourth preset number, controlling the washing device to end the operation.

[0013] In the preferred technical solution of the above defoaming method, the defoaming method further includes: if the foam height obtained again is less than the first preset warning height, controlling the washing device to execute the remaining set program.

[0014] In the preferred technical solution of the above defoaming method, the defoaming method further includes: if the foam height is greater than the second preset warning height, controlling the washing tub to stop rotating; and / or if the foam height is less than the first preset warning height, not performing the defoaming operation and continuing to execute the set program.

[0015] Those skilled in the art can understand that in the preferred technical solution of the defoaming method of the present invention, the foam height in the washing tub is obtained; the foam height is respectively compared with the first preset warning height and the second preset warning height; if the foam height is greater than the first preset warning height but less than the second preset warning height, the process stage where the drum washing machine is currently located is obtained; according to the process stage, different defoaming operations are performed; wherein, the first preset warning height is less than the second preset warning height.

[0016] Compared with the prior art in which defoaming is carried out only when a large amount of foam fills the washing tub, the present invention compares the foam height with a first preset warning height and a second preset warning height respectively, and can predict in advance whether defoaming treatment is needed for the foam in the washing tub, avoiding the blockage of the ventilation pipe due to a large amount of foam filling the washing tub, thus avoiding the obstruction of the water inlet of the drum washing machine due to the excessive pressure in the washing tub, avoiding the motor overload and overheating, and ensuring the normal operation of the drum washing machine. When the foam height in the washing tub is greater than the first preset warning height but less than the second preset warning height, that is, when defoaming treatment is needed, different defoaming operations are performed according to the process stage of the drum washing machine, which can defoam in a targeted manner, quickly and effectively eliminate the foam in the washing tub, reduce the residual amount of foam on the clothes, and can rinse the clothes clean, thereby improving the user experience.

[0017] Further, in the case where the drum washing machine is in the washing stage, generally, in order to improve the washing effect, agitation operation is set and the rotation-stop ratio of the washing tub is set relatively high to increase the water flow intensity. Therefore, the water flow intensity can be reduced by reducing the rotation-stop ratio, canceling the agitation operation, etc., so as to effectively inhibit the generation of foam and achieve the purpose of defoaming; and after the first preset time, according to the comparison results of the foam height obtained again with the first preset warning height and the first preset height respectively, the drum washing machine is selectively controlled to execute the remaining set program or continue to execute the defoaming operation, avoiding the execution of the remaining set program when the defoaming effect does not reach the preset effect, thus avoiding the continuous rise of the foam in the washing tub to the second preset warning height, achieving the purpose of providing the most reasonable defoaming method for the drum washing machine, and further improving the user experience.

[0018] Further, in the case where the drum washing machine is in the rinsing stage, generally, in order to improve the rinsing effect, the rotation frequency of the washing tub is set relatively high to increase the water flow intensity, thereby improving the rinsing effect. Therefore, the water flow intensity can be reduced by reducing the rotation frequency of the washing tub, etc., so as to effectively inhibit the generation of foam and achieve the purpose of defoaming; and after the second preset time, according to the comparison results of the foam height obtained again with the first preset warning height and the second preset height respectively, the drum washing machine is selectively controlled to execute the remaining set program or continue to execute the defoaming operation, avoiding the execution of the remaining set program when the defoaming effect does not reach the preset effect, thus avoiding the continuous rise of the foam in the washing tub to the second preset warning height, achieving the purpose of providing the most reasonable defoaming method for the drum washing machine, and further improving the user experience. Description of the Drawings

[0019] The defoaming method of the present invention will be described below with reference to the drawings in combination with a drum washing machine. In the drawings:

[0020] Figure 1 is the main flowchart of the defoaming method of the present invention;

[0021] Figure 2 is the complete flowchart of the defoaming method of the present invention;

[0022] Figure 3 is the first flowchart of the defoaming method of the drum washing machine of the present invention in the washing stage;

[0023] Figure 4 is the second flowchart of the defoaming method of the drum washing machine of the present invention in the washing stage;

[0024] Figure 5 is the third flowchart of the defoaming method of the drum washing machine of the present invention in the washing stage;

[0025] Figure 6 is the first flowchart of the defoaming method of the drum washing machine of the present invention in the rinsing stage;

[0026] Figure 7 is the second flowchart of the defoaming method of the drum washing machine of the present invention in the rinsing stage;

[0027] Figure 8 is the third flowchart of the defoaming method of the drum washing machine of the present invention in the rinsing stage;

[0028] Figure 9 is the logic diagram (I) of the defoaming method of the present invention;

[0029] Figure 10 is the logic diagram (II) of the defoaming method of the present invention. Detailed Embodiments

[0030] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention. For example, although the present invention is described in combination with a drum washing machine, the technical solution of the present invention is not limited thereto. This defoaming method can obviously also be applied to other washing devices such as a pulsator washing machine and a washing-drying integrated machine, and such changes do not deviate from the principles and scope of the present invention.

[0031] It should be noted that in the description of the present invention, the terms "first", "second", "third" and "fourth" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0032] Based on the technical problems proposed in the background art, the present invention provides a defoaming method for a drum washing machine, aiming to compare the foam height with a first preset warning height and a second preset warning height respectively, so as to be able to predict in advance whether it is necessary to defoam the foam in the washing tub, avoiding the blockage of the ventilation pipe due to a large amount of foam filling in the washing tub, thus avoiding the obstruction of the water inlet of the drum washing machine due to the excessive pressure in the washing tub, avoiding the motor overload and overheating, and ensuring the normal operation of the drum washing machine. When the foam height in the washing tub is greater than the first preset warning height but less than the second preset warning height, that is, when defoaming treatment is required, different defoaming operations are performed according to the process stage of the drum washing machine, which can defoam in a targeted manner, quickly and effectively eliminate the foam in the washing tub, reduce the residue of the foam on the clothes, and be able to rinse the clothes clean, thereby improving the user experience.

[0033] First, refer to Figure 1 and Figure 2 , and describe the defoaming method of the present invention. Among them, Figure 1 is the main flowchart of the defoaming method of the present invention; Figure 2 is the complete flowchart of the defoaming method of the present invention.

[0034] As Figure 1 shown, the drum washing machine of the present invention includes a washing tub, and the washing tub includes an outer tub and an inner tub rotatably arranged in the outer tub; the defoaming method of the present invention includes the following steps:

[0035] S100. During the operation of the drum washing machine, obtain the foam height in the washing tub;

[0036] S200. Compare the foam height with a first preset warning height and a second preset warning height respectively;

[0037] S300. If the foam height is greater than the first preset warning height but less than the second preset warning height, obtain the current process stage of the drum washing machine;

[0038] S400. Perform different defoaming operations according to the process stage.

[0039] Among them, the first preset warning height is less than the second preset warning height, and the second preset warning height is less than the lowest height when the foam fills the washing tub and blocks the ventilation pipe, or the second preset warning height is the height of the foam that will not block the ventilation pipe set by those skilled in the art according to experiments or experience. No matter how the first preset warning height and the second preset warning height are adjusted and set, as long as it can be predicted in advance whether it is necessary to defoam the foam in the washing tub and avoid a large amount of foam filling in the washing tub and blocking the ventilation pipe.

[0040] Wherein, the foam height refers to the height corresponding to the highest position reached by the foam in the washing tub.

[0041] Preferably, a foam detection port is provided on the washing tub, and a foam detection component for detecting the foam height in the washing tub is arranged at the foam detection port. Among them, the foam detection component can be an infrared sensor, an electrode sensor, a float sensor or other detection components. No matter which detection component is adopted, the corresponding specific detection method should not constitute any limitation to the present invention.

[0042] In step S100, the foam height can be detected in real time by the foam detection component, or the foam height can be detected by the foam detection component at time intervals. Among them, the time interval can be 5s, 10s, 15s, etc. The above first time interval is only exemplary and not restrictive. Those skilled in the art can flexibly adjust and set the first time interval in actual applications. No matter how the first time interval is adjusted and set, as long as the foam height can be detected timely and accurately.

[0043] In step S300, if the foam height in the washing tub is greater than the first preset warning height but less than the second preset warning height. For example, the first preset warning height is 200mm, the second preset warning height is 400mm, and the detected foam height is 210mm, which is greater than the first preset warning height but less than the second preset warning height. This indicates that the detected foam height is relatively high and has exceeded the first preset warning height. If the foam in the washing tub continues to increase and rise, it may reach the second preset warning height, and then may block the ventilation pipe, affecting the normal operation of the drum washing machine. To avoid the above situation, defoaming treatment is required. However, since the operations performed by the drum washing machine at different process stages are different, in order to better eliminate the foam, the process stage of the drum washing machine is obtained, and different defoaming operations are performed according to the process stage of the drum washing machine.

[0044] Among them, the process stage can include other stages such as the water injection stage, the washing stage, the drainage stage, the dehydration stage, the rinsing stage, etc.; or if the drum washing machine has a drying function, the process stage can also include the drying stage. Of course, the process stage is not limited to the above-listed stages and can also be other stages such as the standby stage. In the following, the defoaming method of the present invention will be further described by taking the washing stage and the rinsing stage as examples.

[0045] Further, as Figure 2 shown, the defoaming method of the present invention further includes:

[0046] S500. If the foam height is less than the first preset warning height, no defoaming operation is performed, and the set program is continued to be executed;

[0047] S600. If the foam height is greater than the second preset warning height, control the washing drum to stop rotating.

[0048] In step S500, if the foam height is less than the first preset warning height. For example, the first preset warning height is 200 mm and the detected foam height is 180 mm, which is less than the first preset warning height. This indicates that the foam height detected this time is relatively low and has not reached the first preset warning height, so it will not affect the normal operation of the drum washing machine. There is no need to perform defoaming operation, and the set program can be continued.

[0049] In step S600, if the foam height is greater than the second preset warning height. For example, the second preset warning height is 400 mm and the detected foam height is 405 mm, which is greater than the second preset warning height. This indicates that the foam height detected this time is very high and has exceeded the second preset warning height. If the foam in the washing drum continues to increase and rise, it may block the ventilation pipe and affect the normal operation of the drum washing machine. To avoid the above situation, control the washing drum to stop rotating, so that the washing water in the washing drum tends to be static, and the foam is eliminated by the static method. This can completely inhibit the generation of foam, and continuously detect the foam height. When the foam height detected again is less than the first preset warning height, continue to execute the remaining set program.

[0050] It should be noted that the above-listed first preset warning height and second preset warning height are only exemplary, not restrictive. Those skilled in the art can flexibly adjust and set the first preset warning height and second preset warning height according to information such as the model of the drum washing machine and the installation position of the ventilation pipe in actual applications. For example, the first preset warning height is 260 mm, the second preset warning height is 480 mm, etc. No matter how the first preset warning height and second preset warning height are adjusted and set, as long as it can be judged whether defoaming operation is needed.

[0051] It should be further noted that in the above process, steps S300, S500, and S600 have no sequence and are parallel, and are only related to the comparison results of the foam height with the first preset warning height and the second preset warning height respectively. Just execute the corresponding steps according to different comparison results.

[0052] Next, with reference to Figures 3 to 5 , the defoaming method of the drum washing machine of the present invention in the washing stage will be described. Among them, Figure 3 is the first flow chart of the defoaming method of the drum washing machine of the present invention in the washing stage; Figure 4 is the second flow chart of the defoaming method of the drum washing machine of the present invention in the washing stage; Figure 5 is the third flow chart of the defoaming method of the drum washing machine of the present invention in the washing stage.

[0053] As shown Figure 3 in the figure, in step S400, the step of "performing different defoaming operations according to the process stage" specifically includes:

[0054] S411. If the drum washing machine is in the washing stage, reduce the rotation-stop ratio of the washing tub to the first rotation-stop ratio and cancel the agitation operation;

[0055] S412. After the first preset time, obtain the foam height in the washing tub again;

[0056] S413. Compare the foam height obtained again with the first preset warning height and the first preset height respectively;

[0057] S414. According to the comparison result, selectively control the drum washing machine to execute the remaining set program or continue to execute the defoaming operation.

[0058] Among them, the first preset height is greater than the first preset warning height but less than the second preset warning height, and the first preset height is greater than or equal to the foam height obtained last time.

[0059] Among them, the foam height obtained last time refers to the foam height obtained in step S100, and this foam height meets the condition for determining to execute step S300, that is, this foam height meets the condition of being greater than the first preset warning height but less than the second preset warning height. For example, the detected foam height of 210 mm listed in step S300.

[0060] In step S411, in the case where the drum washing machine is in the washing stage, usually, in order to improve the washing effect, the agitation operation is set and the rotation-stop ratio of the washing tub is set relatively high to increase the water flow intensity. Therefore, the water flow intensity can be reduced by reducing the rotation-stop ratio, canceling the agitation operation, etc., so as to effectively inhibit the generation of foam and achieve the purpose of defoaming.

[0061] For example, the current rotation-stop ratio of the washing tub is 30 / 20. Reduce the rotation time of the inner tub and reduce the rotation-stop ratio to 20 / 20 (i.e., the first rotation-stop ratio); or increase the stop time of the inner tub and reduce the rotation-stop ratio to 30 / 30; or both reduce the rotation time of the inner tub and increase the stop time of the inner tub, and reduce the rotation-stop ratio to 25 / 25. By the above methods, the rotation-stop ratio of the washing tub is reduced, so as to reduce the washing water flow intensity of the drum washing machine and effectively eliminate the foam.

[0062] Of course, the defoaming method in step S411 is not limited to the methods listed above. It is also possible to only reduce the rotation-stop ratio of the washing tub to the first rotation-stop ratio, or only cancel the agitation operation. Those skilled in the art can flexibly adjust and set the combination of the defoaming methods in step S411 according to the actual defoaming requirements and defoaming effects, etc.

[0063] In step S412, after the first preset time (e.g., 5 min), the foam height in the washing tub is detected again by the foam detection component, ensuring that after the drum washing machine performs defoaming operations such as reducing the rotation-stop ratio and canceling the agitation operation, the drum washing machine has enough time to eliminate the foam in the washing tub. And according to the comparison results of the foam height obtained again with the first preset warning height and the first preset height respectively, the drum washing machine is selectively controlled to execute the remaining set program or continue to execute the defoaming operation, avoiding executing the remaining set program when the defoaming effect does not reach the preset effect, thereby preventing the foam in the washing tub from continuing to rise to the second preset warning height, achieving the purpose of providing the most reasonable defoaming method for the drum washing machine and further improving the user experience.

[0064] It should be noted that the current rotation-stop ratio, the first rotation-stop ratio, and the first preset time listed above are only exemplary, not restrictive. Those skilled in the art can flexibly adjust and set the current rotation-stop ratio, the first rotation-stop ratio, and the first preset time according to the foam height, defoaming requirements, and defoaming effects, etc. in actual applications.

[0065] As Figure 4 shown, in step S414, the step of "selectively controlling the drum washing machine to execute the remaining set program or continue to execute the defoaming operation according to the comparison result" specifically includes:

[0066] S421. If the foam height obtained again is greater than or equal to the first preset warning height but less than or equal to the first preset height, control the washing tub to continue running at the first rotation-stop ratio;

[0067] S422. Lower the emptying water level when the drum washing machine performs the drainage operation after the washing is completed to the first preset emptying water level, and control the drum washing machine to perform rotational drainage operation when the drum washing machine performs the drainage operation;

[0068] S423. Lower the dehydration acceleration of the washing tub when the drum washing machine performs the dehydration operation after the drainage is completed to the first preset acceleration, and lower the maximum dehydration speed of the washing tub to the first preset speed.

[0069] Among them, the emptying water level is the water level at which the drainage pump of the drum washing machine is started during the drainage stage. As long as the water level of the drainage pump reaches the emptying water level, the drainage pump starts to drain water.

[0070] Among them, the dehydration acceleration is the acceleration at which the dehydration speed of the inner cylinder rises to the set maximum dehydration speed during the dehydration stage; preferably, the dehydration speed rises step by step.

[0071] In step S421, if the foam height obtained again is greater than or equal to the first preset warning height but less than or equal to the first preset height. For example, the first preset warning height is 200 mm, the first preset height is 220 mm, and the foam height detected again is 205 mm. Although the foam height detected again is still greater than the first preset warning height, it is already less than the first preset height and less than the foam height detected last time (such as 210 mm), indicating that the foam is gradually disappearing and the foam height is gradually decreasing, achieving a certain defoaming effect. The defoaming method adopted in step S411 is effective, so continue to execute this defoaming operation, that is, control the washing cylinder to continue running according to the first rotation-stop ratio.

[0072] Or, the first preset warning height is 200 mm, the first preset height is 220 mm, and the foam height detected again is 215 mm. The foam height detected again is still greater than the first preset warning height and greater than the foam height detected last time (such as 210 mm), but the foam height detected again is less than the first preset height, indicating that the foam has not been well eliminated, the foam height has risen slightly, but the rising amplitude of the foam is not large and is within the controllable range. It may be caused by detection error or short defoaming time, and it does not mean that the defoaming method adopted in step S411 has no effect. Therefore, the defoaming method adopted in step S411 can be continued to be executed, that is, control the washing cylinder to continue running according to the first rotation-stop ratio.

[0073] In step S422, lower the emptying water level of the drainage pump when the subsequent drum washing machine performs the drainage operation after the washing is completed to the first preset emptying water level. For example, the current emptying water level of the drainage pump is 14 mm, and lower the emptying water level to 12 mm (i.e., the first preset emptying water level). When the water level of the drainage pump reaches 12 mm, the drainage pump starts to drain water, shortening the time interval between two adjacent starts of the drainage pump, increasing the drainage frequency of the drainage pump, and being able to drain the washing water in time, avoiding the impact effect generated during the rotation of the inner cylinder, thereby avoiding the generation of foam.

[0074] Furthermore, when the drum washing machine performs the drainage operation, control the drum washing machine to perform the rotating drainage operation. During the rotation of the inner cylinder, it can drive the clothes in the inner cylinder to rotate, thereby driving away or eliminating the foam filling therein. Under the combined action of lowering the emptying water level and rotating drainage, the foam can be better eliminated, further improving the defoaming effect.

[0075] In step S423, when the subsequent drum washing machine finishes draining and performs the dehydration operation, the dehydration acceleration of the washing drum is reduced to a first preset acceleration. For example, if the current dehydration acceleration of the inner drum is 25 r / s, the dehydration acceleration is reduced to 20 r / s (i.e., the first preset acceleration). By reducing the dehydration acceleration, the time for the dehydration speed of the inner drum to rise to the maximum dehydration speed is prolonged, and the time for the centrifugal force generated during the dehydration process to rapidly rise to the maximum centrifugal force is prolonged. This avoids the rapid increase of the centrifugal force generated during the dehydration process to the maximum centrifugal force, shortens the action time of the clothing being squeezed by the maximum centrifugal force, thereby reducing the amount of foam generated by the clothing under the action of the maximum centrifugal force, and further improving the defoaming effect.

[0076] Moreover, since the time for the centrifugal force generated during the dehydration process to rapidly rise to the maximum centrifugal force is prolonged, the centrifugal force exerted on the clothing at the same time point is reduced, thereby reducing the amount of drained washing water. Also, since the drain water level is reduced to the first preset drain water level in step S422, even if the amount of drained washing water is reduced, the drained washing water can be discharged in time, avoiding the beating effect during the rotation of the inner drum, and thus avoiding the generation of foam.

[0077] Furthermore, the maximum dehydration speed of the washing drum is reduced to a first preset speed. For example, if the current maximum dehydration speed of the inner drum is 1400 r / min, the maximum dehydration speed is reduced to 1200 r / min (i.e., the first preset speed). By reducing the maximum dehydration speed, the maximum centrifugal force generated during the dehydration process is reduced, thereby reducing the amount of foam generated by the clothing under the squeezing action of the maximum centrifugal force, and further improving the defoaming effect.

[0078] Of course, the defoaming method in step S423 is not limited to the methods listed above. It is also possible to only reduce the dehydration acceleration of the washing drum to the first preset acceleration, or only reduce the maximum dehydration speed of the washing drum to the first preset speed. Those skilled in the art can flexibly adjust and set the combination of the defoaming methods in step S423 according to actual defoaming requirements and defoaming effects, etc.

[0079] After step S423, control the drum washing machine to execute the remaining set program, such as controlling the drum washing machine to execute the rinsing program, etc.

[0080] It should be noted that the above-listed first preset warning height, first preset height, current drainage water level, first preset drainage water level, current dehydration acceleration, first preset acceleration, current maximum dehydration speed, and first preset speed are only exemplary and not restrictive. Those skilled in the art can flexibly adjust and set the first preset warning height, first preset height, current drainage water level, first preset drainage water level, current dehydration acceleration, first preset acceleration, current maximum dehydration speed, and first preset speed according to the foam height, defoaming requirements, and defoaming effect in actual applications.

[0081] As Figure 5 shown, in step S414, the step of "selectively controlling the drum washing machine to execute the remaining set program or continue to execute the defoaming operation according to the comparison result" further includes:

[0082] S431. If the foam height obtained again is greater than the first preset height, reduce the rotation-stop ratio of the drum washing machine to a second rotation-stop ratio, where the second rotation-stop ratio is less than the first rotation-stop ratio;

[0083] S432. Reduce the drainage water level when the subsequent drum washing machine performs the drainage operation after the washing is completed to a second preset drainage water level, and control the drum washing machine to perform rotational drainage when the drum washing machine performs the drainage operation;

[0084] S433. Reduce the dehydration acceleration of the washing drum when the subsequent drum washing machine performs the dehydration operation after the drainage is completed to a second preset acceleration, and reduce the maximum dehydration speed of the washing drum to a second preset speed;

[0085] S434. After the dehydration of the drum washing machine is completed, obtain the set number of rinsing times of the drum washing machine;

[0086] S435. Determine whether the set number of rinsing times is less than the first preset number of times;

[0087] S436. If the set number of rinsing times is less than the first preset number of times, increase the number of rinsing times;

[0088] S437. If the set number of rinsing times is greater than or equal to the first preset number of times, do not adjust the number of rinsing times.

[0089] In step S431, if the foam height obtained again is greater than the first preset height, for example, the first preset height is 220 mm and the detected foam height is 225 mm, which is greater than the first preset height. Since the first preset height is greater than the previously detected foam height (such as 210 mm), it indicates that the foam has not been well eliminated but has significantly increased. This shows that the defoaming method adopted in step S411 cannot effectively eliminate the foam, and continuing to execute the defoaming method adopted in step S411 will also not be able to eliminate the foam. In order to eliminate the foam, the rotation-stop ratio of the washing tub is further reduced, and the washing water flow intensity of the drum washing machine is further reduced, thereby effectively suppressing the generation of foam and achieving the purpose of defoaming.

[0090] For example, the first rotation-stop ratio of the washing tub is 20 / 20. By reducing the rotation time of the inner tub, the rotation-stop ratio is reduced to 10 / 20 (i.e., the second rotation-stop ratio); or by increasing the stop time of the inner tub, the rotation-stop ratio is reduced to 20 / 30; or by both reducing the rotation time of the inner tub and increasing the stop time of the inner tub, the rotation-stop ratio is reduced to 15 / 25. By the above methods, the rotation-stop ratio of the washing tub is further reduced, thereby further reducing the washing water flow intensity of the drum washing machine, and the foam can be effectively eliminated.

[0091] In step S432, the emptying water level when the subsequent drum washing machine performs the drainage operation after the washing is completed is reduced to the second preset emptying water level. For example, the current emptying water level of the drainage pump is 14 mm, and the emptying water level is reduced to 10 mm (i.e., the second preset emptying water level). When the water level of the drainage pump reaches 10 mm, the drainage pump starts to drain water, shortening the time interval between two adjacent starts of the drainage pump, increasing the drainage frequency of the drainage pump, being able to drain the washing water in time, avoiding the beating effect generated during the rotation of the inner tub, and thus avoiding the generation of foam.

[0092] Furthermore, when the drum washing machine performs the drainage operation, it is controlled to perform the rotational drainage operation. During the rotation of the inner tub, the clothes in the inner tub can be driven to rotate, thereby driving away or eliminating the foam filling therein. Under the combined action of reducing the emptying water level and rotational drainage, the foam can be better eliminated, further improving the defoaming effect.

[0093] In step S433, when performing the dehydration operation after the subsequent drum washing machine finishes draining, the dehydration acceleration of the washing tub is reduced to a second preset acceleration. For example, if the current dehydration acceleration of the inner tub is 25 r / s, the dehydration acceleration is reduced to 10 r / s (i.e., the second preset acceleration). By reducing the dehydration acceleration, the time for the dehydration speed of the inner tub to rise to the maximum dehydration speed is extended, and the time for the centrifugal force generated during dehydration to rapidly rise to the maximum centrifugal force is extended. This avoids the centrifugal force generated during dehydration from rapidly rising to the maximum centrifugal force, shortens the action time of the clothing being squeezed by the maximum centrifugal force, thereby reducing the number of bubbles generated by the clothing under the action of the maximum centrifugal force, and further improving the defoaming effect.

[0094] Moreover, since the time for the centrifugal force generated during dehydration to rapidly rise to the maximum centrifugal force is extended, the centrifugal force exerted on the clothing at the same time point is reduced, thereby reducing the amount of washing water discharged. Also, since the emptying water level is reduced to the second preset emptying water level in step S432, even if the amount of discharged washing water is reduced, the discharged washing water can be discharged in time, avoiding the impact effect during the rotation of the inner tub, and thus avoiding the generation of bubbles.

[0095] Furthermore, the maximum dehydration speed of the washing tub is reduced to a second preset speed. For example, if the current maximum dehydration speed of the inner tub is 1400 r / min, the maximum dehydration speed is reduced to 1000 r / min (i.e., the second preset speed). By reducing the maximum dehydration speed, the maximum centrifugal force generated during dehydration is reduced, thereby reducing the number of bubbles generated by the clothing under the squeezing action of the maximum centrifugal force, and further improving the defoaming effect.

[0096] Of course, the defoaming method in step S433 is not limited to the methods listed above. It is also possible to only reduce the dehydration acceleration of the washing tub to the second preset acceleration, or only reduce the maximum dehydration speed of the washing tub to the second preset speed. Those skilled in the art can flexibly adjust and set the combination mode of the defoaming method in step S433 according to actual defoaming requirements and defoaming effects.

[0097] In step S434, since the foam height obtained again in step S431 is greater than the first preset height, it indicates that there is more foam in the washing tub. Even after defoaming, problems such as incomplete rinsing and foam residue may occur. To avoid the above situation, it may be necessary to perform rinsing multiple times to rinse the clothes clean. However, the user may already know that the detergent is over-dosed and has set a rinsing number more than the normal rinsing number. To avoid wasting resources, the set rinsing number of the drum washing machine is obtained, and it is judged whether to increase the rinsing number according to the already set rinsing number.

[0098] In step S436, if the set number of rinsing times is less than the first preset number of times, for example, the first preset number of times is 5 times and the set number of rinsing times is 3 times, which is less than the first preset number of times, it indicates that the set number of rinsing times is relatively small and it is difficult to rinse the clothes clean. To avoid foam remaining on the clothes, the number of rinsing times is increased, for example, increased by 1 or 2 times, and the increased number of rinsing times must not be greater than the first preset number of times.

[0099] In step S437, if the set number of rinsing times is greater than or equal to the first preset number of times, for example, the first preset number of times is 5 times and the set number of rinsing times is 6 times, which is greater than the first preset number of times, it indicates that the set number of rinsing times is very large and the clothes can be rinsed clean, so there is no need to adjust the number of rinsing times.

[0100] It should be noted that the above-listed first preset height, first rotation-stop ratio, second rotation-stop ratio, current drainage water level, second preset drainage water level, current dehydration acceleration, second preset acceleration, current maximum dehydration speed, second preset speed, and first preset number of times are only exemplary and not restrictive. Those skilled in the art can flexibly adjust and set the first preset height, first rotation-stop ratio, second rotation-stop ratio, current drainage water level, second preset drainage water level, current dehydration acceleration, second preset acceleration, current maximum dehydration speed, second preset speed, and first preset number of times according to the foam height, defoaming requirements, and defoaming effect in actual applications.

[0101] It should be further noted that in the above process, steps S436 and S437 have no sequence and are parallel, and are only related to the judgment result of whether the set number of rinsing times is less than the first preset number of times. Just execute the corresponding steps according to different judgment results.

[0102] Although not shown in the figure, in step S414, the step of "selectively controlling the drum washing machine to execute the remaining set program or continue to execute the defoaming operation according to the comparison result" further includes:

[0103] S441. If the foam height obtained again is less than the first preset warning height, control the drum washing machine to execute the remaining set program.

[0104] In step S441, if the foam height obtained again is less than the first preset warning height, for example, the first preset warning height is 200 mm and the foam height detected again is 190 mm, which is less than the first preset warning height, it indicates that the foam height has been reduced below the first preset warning height at this time, the warning is eliminated, and it can operate normally. Then control the drum washing machine to execute the remaining set program.

[0105] It should be noted that in the above process, steps S421, S431, and S441 have no sequence and are parallel. They are only related to the comparison results of the foam height obtained again with the first preset warning height and the first preset height respectively. Corresponding steps can be executed according to different comparison results.

[0106] The following refers to Figures 6 to 8 , and describes the defoaming method of the drum washing machine of the present invention in the rinsing stage. Among them, Figure 6 is the first flowchart of the defoaming method of the drum washing machine of the present invention in the rinsing stage; Figure 7 is the second flowchart of the defoaming method of the drum washing machine of the present invention in the rinsing stage; Figure 8 is the third flowchart of the defoaming method of the drum washing machine of the present invention in the rinsing stage.

[0107] As Figure 6 shown, in step S400, the step of "performing different defoaming operations according to the process stage" further includes:

[0108] S451. If the drum washing machine is in the rinsing stage, reduce the rotation frequency of the washing tub to a preset rotation frequency;

[0109] S452. After a second preset interval, obtain the foam height in the washing tub again;

[0110] S453. Compare the foam height obtained again with the first preset warning height and the second preset height respectively;

[0111] S454. According to the comparison result, selectively control the drum washing machine to execute the remaining set program or continue to execute the defoaming operation;

[0112] Among them, the second preset height is greater than the first preset warning height but less than the second preset warning height, and the second preset height is greater than or equal to the foam height obtained last time.

[0113] Among them, the foam height obtained last time refers to the foam height obtained in step S100, and this foam height meets the condition for determining to execute step S300, that is, this foam height meets the condition of being greater than the first preset warning height but less than the second preset warning height. For example, the detected foam height of 210 mm listed in step S300.

[0114] In step S451, in the case where the drum washing machine is in the rinsing stage, generally, in order to improve the rinsing effect, the rotation frequency of the washing tub is set relatively high to increase the water flow intensity. Therefore, the water flow intensity can be reduced by reducing the rotation frequency and other methods, thereby effectively suppressing the generation of foam and achieving the purpose of defoaming.

[0115] For example, the current rotation frequency of the washing drum is 10 seconds of rotation every 30 seconds. The rotation frequency is reduced to 5 seconds of rotation every 30 seconds (i.e., the preset rotation frequency), or the rotation frequency is reduced to 10 seconds of rotation every 40 seconds, or the rotation frequency is reduced to 8 seconds of rotation every 28 seconds. By the above method, the rotation frequency of the washing drum is reduced, thereby reducing the washing and rinsing water flow intensity of the drum washing machine, and effectively eliminating foam.

[0116] In step S452, after the second preset time (such as 5 minutes), the foam height in the washing drum is detected again by the foam detection component, ensuring that after the drum washing machine performs defoaming operations such as reducing the rotation frequency, the drum washing machine has enough time to eliminate the foam in the washing drum. And according to the comparison results of the foam height obtained again with the first preset warning height and the second preset height, the drum washing machine is selectively controlled to execute the remaining set procedures or continue to execute the defoaming operation, avoiding executing the remaining set procedures when the defoaming effect does not reach the preset effect, thereby preventing the foam in the washing drum from continuing to rise to the second preset warning height, achieving the purpose of providing the most reasonable defoaming method for the drum washing machine, and further improving the user experience.

[0117] Although the second preset time listed above is the same as the first preset time, this is only exemplary and not restrictive. In practical applications, those skilled in the art can also set the second preset time to be different from the first preset time. For example, the first preset time is 4 minutes and the second preset time is 6 minutes. The present invention does not make any restrictions on this.

[0118] It should be noted that the current rotation frequency, preset rotation frequency, and second preset time listed above are only exemplary and not restrictive. Those skilled in the art can flexibly adjust and set the current rotation frequency, preset rotation frequency, and second preset time according to the foam height, defoaming requirements, and defoaming effect in practical applications.

[0119] As Figure 7 shown, in step S454, the step of "selectively controlling the drum washing machine to execute the remaining set procedures or continue to execute the defoaming operation according to the comparison result" specifically includes:

[0120] S461. If the foam height obtained again is greater than or equal to the first preset warning height but less than or equal to the second preset height, control the washing drum to continue running at the preset rotation frequency;

[0121] S462. Lower the emptying water level when the drum washing machine performs the drainage operation after the rinsing is completed to the third preset emptying water level;

[0122] S463. After the drainage of the drum washing machine is completed, control the drum washing machine to perform a spray rinse operation and control the drum washing machine to perform a rotating drainage operation;

[0123] S464. When the subsequent dehydration operation is performed after the drainage of the drum washing machine is completed, reduce the dehydration acceleration of the washing tub to a third preset acceleration and reduce the maximum dehydration speed of the washing tub to a third preset speed;

[0124] S465. After the dehydration of the drum washing machine is completed, control the drum washing machine to perform a spray rinse operation again;

[0125] S466. After the drum washing machine finishes the second spray rinse, obtain the remaining number of rinse times of the drum washing machine;

[0126] S467. Determine whether the remaining number of rinse times is greater than or equal to a second preset number;

[0127] If so, execute step S468;

[0128] If not, execute step S469;

[0129] S468. Control the drum washing machine to continue performing the rinse operation;

[0130] S469. Control the drum washing machine to end the operation.

[0131] Wherein, the emptying water level is the water level at which the drainage pump of the drum washing machine is started during the drainage stage. As long as the water level of the drainage pump reaches the emptying water level, the drainage pump starts to drain water.

[0132] Wherein, the dehydration acceleration is the acceleration at which the dehydration speed of the inner tub rises to the set maximum dehydration speed during the dehydration stage; preferably, the dehydration speed rises step by step.

[0133] In step S461, if the foam height obtained again is greater than or equal to a first preset warning height but less than or equal to a second preset height. For example, the first preset warning height is 200 mm, the second preset height is 225 mm, and the foam height detected again is 205 mm. Although the foam height detected again is still greater than the first preset warning height, it is already less than the second preset height and less than the foam height detected last time (such as 210 mm), indicating that the foam is gradually disappearing and the foam height is gradually decreasing, achieving a certain defoaming effect. The defoaming method adopted in step S451 is effective, so continue to perform this defoaming operation, that is, control the washing tub to continue running at the preset rotation frequency.

[0134] Alternatively, the first preset warning height is 200 mm, the second preset height is 225 mm, the height of the foam detected again is 215 mm. The height of the foam detected again is still greater than the first preset warning height and greater than the height of the foam detected last time (e.g., 210 mm). However, the height of the foam detected again is less than the second preset height, indicating that the foam has not been well eliminated. The height of the foam has increased slightly, but the increase amplitude of the foam is not large and within the controllable range. It may be caused by detection error or short defoaming time, and it does not mean that the defoaming method adopted in step S451 has no effect. Therefore, the defoaming method adopted in step S451 can be continued, that is, controlling the washing drum to continue running at the preset rotation frequency.

[0135] Although the second preset height and the first preset height listed above are different, this is only exemplary and not restrictive. In actual applications, those skilled in the art can also set the second preset height to be equal to the first preset height. For example, the first preset height is 222 mm and the second preset height is also 222 mm. The present invention makes no restrictions on this.

[0136] In step S462, the emptying water level of the drain pump when the subsequent drum washing machine performs the draining operation after the rinsing is completed is reduced to the third preset emptying water level. For example, the current emptying water level of the drain pump is 14 mm, and the emptying water level is reduced to 8 mm (i.e., the third preset emptying water level). When the water level of the drain pump reaches 8 mm, the drain pump starts to drain water, shortening the time interval between two adjacent starts of the drain pump, increasing the drainage frequency of the drain pump, enabling the washing water to be discharged in time, avoiding the impact generated during the rotation of the inner drum, and thus avoiding the generation of foam.

[0137] In step S463, after the drum washing machine finishes draining water, control the drum washing machine to perform a spray rinsing operation, such as spray rinsing for 20 s; and control the drum washing machine to perform a rotating draining operation to rotate the clothes in the inner drum to the front part of the inner drum (i.e., the position close to the window gasket), so that all the sprayed washing water can be sprayed onto the clothes, effectively eliminating the foam and further improving the defoaming effect.

[0138] In step S464, when performing the dehydration operation after the subsequent drum washing machine finishes draining, the dehydration acceleration of the washing tub is reduced to a third preset acceleration. For example, if the current dehydration acceleration of the inner tub is 25 r / s, the dehydration acceleration is reduced to 5 r / s (i.e., the third preset acceleration). By reducing the dehydration acceleration, the time for the dehydration speed of the inner tub to rise to the maximum dehydration speed is extended, and the time for the centrifugal force generated during dehydration to rapidly rise to the maximum centrifugal force is extended. This avoids the centrifugal force generated during dehydration from rapidly rising to the maximum centrifugal force, shortens the action time of the clothes being squeezed by the maximum centrifugal force, thereby reducing the number of bubbles generated by the clothes under the action of the maximum centrifugal force, and further improving the defoaming effect.

[0139] Moreover, since the time for the centrifugal force generated during dehydration to rapidly rise to the maximum centrifugal force is extended, the centrifugal force exerted on the clothes at the same time point is reduced, thereby reducing the amount of washing water discharged. Also, since the emptying water level is reduced to the third preset emptying water level in step S462, even if the amount of discharged washing water is reduced, the discharged washing water can be discharged in time, avoiding the impact effect during the rotation of the inner tub, and thus avoiding the generation of bubbles.

[0140] Furthermore, the maximum dehydration speed of the washing tub is reduced to a third preset speed. For example, if the current maximum dehydration speed of the inner tub is 1400 r / min, the maximum dehydration speed is reduced to 800 r / min (i.e., the third preset speed). By reducing the maximum dehydration speed, the maximum centrifugal force generated during dehydration is reduced, thereby reducing the number of bubbles generated by the clothes under the action of the maximum centrifugal force squeezing, and further improving the defoaming effect.

[0141] Of course, the defoaming method in step S464 is not limited to the methods listed above. It can also only reduce the dehydration acceleration of the washing tub to the third preset acceleration, or only reduce the maximum dehydration speed of the washing tub to the third preset speed. Those skilled in the art can flexibly adjust and set the combination mode of the defoaming method in step S464 according to actual defoaming requirements and defoaming effects, etc.

[0142] S465. After the drum washing machine finishes dehydration, control the drum washing machine to perform the spray rinsing operation again, for example, spray rinse for 25 s, to further eliminate bubbles and reduce the residual amount of bubbles on the clothes.

[0143] In step S466, since it is not certain whether the current rinsing stage (i.e., the rinsing stage determined in step S451) is the last rinsing of the drum washing machine, after the defoaming in step S465 is completed, the remaining rinsing times of the drum washing machine are obtained, and it is judged whether to end the operation or continue to perform the rinsing operation according to the remaining rinsing times.

[0144] In step S468, if the remaining number of rinsing times is greater than or equal to the second preset number of times, for example, the second preset number of times is 1 time and the remaining number of rinsing times is 2 times, which is greater than the second preset number of times, it indicates that the current rinsing stage is not the last rinsing of the drum washing machine, and there are still 2 rinsing operations not yet executed. Then, control the drum washing machine to continue executing the rinsing operation.

[0145] In step S469, if the remaining number of rinsing times is less than the second preset number of times, for example, the second preset number of times is 1 time and the remaining number of rinsing times is 0 times, which is less than the second preset number of times, it indicates that the current rinsing stage is the last rinsing of the drum washing machine. Then, after the dehydration of the drum washing machine is completed, control the drum washing machine to end the operation.

[0146] It should be noted that the above-listed first preset warning height, second preset height, current emptying water level, third preset emptying water level, spray rinsing time, current dehydration acceleration, third preset acceleration, current maximum dehydration speed, third preset speed, and second preset number of times are only exemplary, not restrictive. Those skilled in the art can flexibly adjust and set the first preset warning height, second preset height, current emptying water level, third preset emptying water level, spray rinsing time, current dehydration acceleration, third preset acceleration, current maximum dehydration speed, third preset speed, and second preset number of times according to the foam height, defoaming requirements, and defoaming effect in actual applications.

[0147] It should be further noted that in the above process, steps S468 and S469 have no sequence, are parallel, and are only related to the judgment result of whether the remaining number of rinsing times is greater than or equal to the second preset number of times. Just execute the corresponding steps according to different judgment results.

[0148] As Figure 8 shown, in step S454, the step of "selectively controlling the drum washing machine to execute the remaining set programs or continue to execute the defoaming operation according to the comparison result" further includes:

[0149] S471. If the foam height obtained again is greater than the second preset height, then control the washing drum to stop rotating and make the drum washing machine execute the drainage operation;

[0150] S472. After the drainage of the drum washing machine is completed, control the drum washing machine to execute the dehydration operation;

[0151] S473. After the dehydration of the drum washing machine is completed, obtain the remaining number of rinsing times of the drum washing machine;

[0152] S474. Judge whether the remaining number of rinsing times is less than the third preset number of times;

[0153] If not, then execute step S475;

[0154] If so, execute step S476;

[0155] S475. Control the drum washing machine to continue the rinsing operation;

[0156] S476. Obtain the set number of rinsing times of the drum washing machine;

[0157] S477. Determine whether the set number of rinsing times is less than the fourth preset number;

[0158] If so, execute step S478;

[0159] If not, execute step S479;

[0160] S478. Increase the number of rinsing times;

[0161] S479. Control the drum washing machine to end the operation.

[0162] In step S471, if the foam height obtained again is greater than the second preset height. For example, the second preset height is 225 mm and the detected foam height is 230 mm, which is greater than the second preset height. Since the second preset height is greater than the previously detected foam height (such as 210 mm), it indicates that the foam is not well eliminated but has significantly increased, indicating that the defoaming method adopted in step S451 cannot effectively eliminate the foam. Continuing to execute the defoaming method adopted in step S451 cannot eliminate the foam either. Then, control the washing tub to stop rotating and make the drum washing machine perform the drainage operation to lower the water level and prevent the foam from blocking the ventilation pipe.

[0163] In step S473, since it is not certain whether the current rinsing stage (i.e., the rinsing stage determined in step S451) is the last rinsing of the drum washing machine, after the dehydration in step S472 is completed, obtain the remaining number of rinsing times of the drum washing machine and judge whether to end the operation or continue the rinsing operation based on the remaining number of rinsing times.

[0164] In step S475, if the remaining number of rinsing times is greater than or equal to the third preset number. For example, the third preset number is 1 time and the remaining number of rinsing times is 3 times, which is equal to the third preset number, indicating that the current rinsing stage is not the last rinsing of the drum washing machine and there are still 3 rinsings not yet performed. Then, control the drum washing machine to continue the rinsing operation.

[0165] In step S476, if the remaining number of rinsing cycles is less than the third preset number, for example, the third preset number is 1 and the remaining number of rinsing cycles is 0, which is less than the third preset number, it indicates that the current rinsing stage is the last rinsing cycle of the drum washing machine. However, the foam height obtained again in step S471 is greater than the second preset height, meaning there is still a lot of foam in the washing drum and the clothes have not been rinsed clean yet, and more rinsing cycles are needed to rinse the clothes clean. To determine whether to increase the number of rinsing cycles, the set number of rinsing cycles of the drum washing machine is obtained, and based on the set number of rinsing cycles, it is determined whether to increase the number of rinsing cycles.

[0166] In step S478, if the set number of rinsing cycles is less than the fourth preset number, for example, the fourth preset number is 5 and the set number of rinsing cycles is 3, which is less than the fourth preset number, it indicates that the set number of rinsing cycles is small. To rinse the clothes clean, the number of rinsing cycles can be increased, for example, increased by 1 or 2 times, and the increased number of rinsing cycles must not be greater than the fourth preset number.

[0167] In step S479, if the set number of rinsing cycles is greater than or equal to the fourth preset number, for example, the fourth preset number is 5 and the set number of rinsing cycles is 6, which is greater than the fourth preset number, it indicates that the set number of rinsing cycles is very large. And during the last rinsing process, the detected foam height is still higher than the first preset warning height, and after defoaming treatment, the detected foam height obtained again is greater than the second preset height, and the foam still cannot be eliminated. It may be caused by a malfunction of the detection component or too much detergent being dispensed. Whatever the reason, it is not suitable to continue the rinsing operation, so the drum washing machine is controlled to end the operation.

[0168] It should be noted that in the above process, steps S475 and S476 have no sequence and are parallel, and are only related to the judgment result of whether the remaining number of rinsing cycles is less than the third preset number. Just execute the corresponding steps according to different judgment results. Steps S478 and S479 have no sequence and are parallel, and are only related to the judgment result of whether the set number of rinsing cycles is less than the fourth preset number. Just execute the corresponding steps according to different judgment results.

[0169] Although not shown in the figure, in step S454, the step of "selectively controlling the drum washing machine to execute the remaining set program or continue to execute the defoaming operation according to the comparison result" further includes:

[0170] S481. If the foam height obtained again is less than the first preset warning height, control the drum washing machine to execute the remaining set program.

[0171] In step S481, if the foam height obtained again is less than the first preset warning height, for example, the first preset warning height is 200 mm and the detected foam height is 185 mm, which is less than the first preset warning height, it indicates that the foam height has dropped below the first preset warning height at this time, the warning is eliminated, and it can operate normally. Then, control the drum washing machine to execute the remaining set program.

[0172] It should be noted that in the above process, steps S461, S471, and S481 have no sequence and are parallel. They are only related to the comparison results of the foam height obtained again with the first preset warning height and the first preset height respectively. Just execute the corresponding steps according to different comparison results.

[0173] In addition, it should also be noted that although the above-listed first preset drain water level, second preset drain water level, and third preset drain water level are different from each other, the first preset acceleration, second preset acceleration, and third preset acceleration are different from each other, and the second preset speed, first preset speed, and third preset speed are different from each other, this is only exemplary and not restrictive. In actual applications, those skilled in the art can also set any two or all of the first preset drain water level, second preset drain water level, and third preset drain water level to be the same; any two or all of the first preset acceleration, second preset acceleration, and third preset acceleration can be set to be the same; any two or all of the second preset speed, first preset speed, and third preset speed can be set to be the same, and the present invention does not impose any restrictions on this.

[0174] Next, with reference to Figure 9 and Figure 10 , a possible control process of the present invention will be introduced. Among them, Figure 9 is the logic diagram (one) of the defoaming method of the present invention; Figure 10 is the logic diagram (two) of the defoaming method of the present invention.

[0175] As Figure 9 shown, a possible complete process of the defoaming method of the present invention is:

[0176] S701. During the operation of the drum washing machine, obtain the foam height h1 in the washing tub;

[0177] S702. Compare h1 with the first preset warning height h 01 and the second preset warning height h 02 respectively;

[0178] If h1 < h 01 , then execute step S703;

[0179] If h1 > h02 , step S704 is executed;

[0180] If h 01 ≤ h1 ≤ h 02 , step S705 is executed;

[0181] S703. Do not perform defoaming operation and continue to execute step S719;

[0182] S704. Control the washing tub to stop rotating and continuously detect the foam height. When the detected foam height is less than the first preset warning height again, execute step S719;

[0183] S705. Obtain the current process stage of the drum washing machine;

[0184] If the drum washing machine is in the washing stage, step S706 is executed;

[0185] S706. Reduce the rotation-stop ratio of the washing tub to the first rotation-stop ratio and cancel the agitation operation;

[0186] S707. After 5 minutes, obtain the foam height h2 in the washing tub again;

[0187] S708. Compare h2 with the first preset warning height h 01 and the first preset height h 11 respectively;

[0188] If h 01 ≤ h2 ≤ h 11 , step S709 is executed;

[0189] If h2 > h 11 , step S712 is executed;

[0190] If h2 < h 01 , step S719 is executed;

[0191] S709. Control the washing tub to continue running at the first rotation-stop ratio;

[0192] S710. Reduce the emptying water level when the subsequent drum washing machine performs the drainage operation after the washing is completed to the first preset emptying water level, and control the drum washing machine to perform rotational drainage operation when the drum washing machine performs the drainage operation;

[0193] S711. Reduce the dehydration acceleration of the washing tub when the subsequent drum washing machine performs the dehydration operation after the drainage is completed to the first preset acceleration, and reduce the maximum dehydration speed of the washing tub to the first preset speed;

[0194] After step S711, step S719 is executed;

[0195] S712. Reduce the rotation - stop ratio of the drum washing machine to a second rotation - stop ratio, where the second rotation - stop ratio is less than the first rotation - stop ratio;

[0196] S713. Reduce the emptying water level when the subsequent drum washing machine performs a drainage operation after the washing is completed to a second preset emptying water level, and control the drum washing machine to perform a rotating drainage operation when the drum washing machine performs the drainage operation;

[0197] S714. Reduce the dehydration acceleration of the washing drum when the subsequent drum washing machine performs a dehydration operation after the drainage is completed to a second preset acceleration, and reduce the maximum dehydration speed of the washing drum to a second preset speed;

[0198] S715. After the drum washing machine finishes dehydration, obtain the set number of rinsing times C1 of the drum washing machine;

[0199] S716. Determine whether C1 is less than 5 (i.e., the first preset number); if so, execute step S717; if not, execute step S718;

[0200] S717. Increase the number of rinsing times;

[0201] S718. Do not adjust the number of rinsing times;

[0202] S719. Control the drum washing machine to execute the remaining set program;

[0203] If the drum washing machine is in the rinsing stage, execute step S720;

[0204] S720. Reduce the rotation frequency of the washing drum to a preset rotation frequency;

[0205] S721. After 5 minutes, obtain the foam height h3 in the washing drum again;

[0206] S722. Compare h3 with the first preset warning height h 01 and the second preset height h 12 respectively;

[0207] If h3 < h 01 , then execute step S723;

[0208] If h 01 ≤h3≤h 12 , then execute step S724;

[0209] If h3 > h 12 , then execute step S732;

[0210] S723. Control the drum washing machine to execute the remaining set program

[0211] S724. Control the washing drum to continue running at a preset rotation frequency;

[0212] S725. Lower the emptying water level when the subsequent drum washing machine performs the draining operation after the rinsing is completed to a third preset emptying water level;

[0213] S726. After the drum washing machine finishes draining, control the drum washing machine to perform a spray rinsing operation and control the drum washing machine to perform a rotating draining operation;

[0214] S727. After the subsequent drum washing machine finishes draining and performs the dehydration operation, lower the dehydration acceleration of the washing drum to a third preset acceleration and lower the maximum dehydration speed of the washing drum to a third preset speed;

[0215] S728. After the drum washing machine finishes dehydration, control the drum washing machine to perform the spray rinsing operation again;

[0216] S729. After the drum washing machine finishes the second spray rinsing, obtain the remaining rinsing times C2 of the drum washing machine;

[0217] S730. Determine whether C2 is greater than or equal to 1 (i.e., the second preset number); if so, execute step S731; if not, execute step S739;

[0218] S731. Control the drum washing machine to continue performing the rinsing operation;

[0219] S732. Control the washing drum to stop rotating and make the drum washing machine perform the draining operation;

[0220] S733. After the drum washing machine finishes draining, control the drum washing machine to perform the dehydration operation;

[0221] S734. After the drum washing machine finishes dehydration, obtain the remaining rinsing times C3 of the drum washing machine;

[0222] S735. Determine whether C3 is less than 1 (i.e., the third preset number); if so, execute step S736; if not, execute step S731;

[0223] S736. Obtain the set rinsing times C4 of the drum washing machine;

[0224] S737. Determine whether C4 is less than 5 (i.e., the fourth preset number); if so, execute step S738; if not, execute step S731;

[0225] S738. Increase the rinsing times;

[0226] S739. Control the drum washing machine to end the operation.

[0227] It should be noted that the above embodiments are only a preferred embodiment of the present invention, which is only used to illustrate the principle of the method of the present invention and is not intended to limit the protection scope of the present invention. In actual applications, those skilled in the art can, according to needs, allocate the above functions to different steps to complete, that is, decompose or combine the steps in the embodiments of the present invention. For example, the steps in the above embodiments can be combined into one step or further split into multiple sub-steps to complete all or part of the functions described above. For the names of the steps involved in the embodiments of the present invention, they are only used to distinguish each step and are not regarded as a limitation of the present invention.

[0228] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of the present invention.

Claims

1. A defoaming method for a washing device, characterized in that, The washing device includes a washing drum, and the defoaming method includes the following steps: During the operation of the washing device, obtain the foam height in the washing drum; Compare the foam height with a first preset warning height and a second preset warning height respectively; If the foam height is greater than the first preset warning height but less than the second preset warning height, obtain the process stage at which the washing device is currently located; According to the process stage, perform different defoaming operations, specifically including: If the washing device is in the washing stage, reduce the rotation-stop ratio of the washing drum to a first rotation-stop ratio and / or cancel the agitation operation; After a first preset time, obtain the foam height in the washing drum again; Compare the foam height obtained again with the first preset warning height and a first preset height respectively; According to the comparison result, selectively control the washing device to execute the remaining set procedures or continue to perform the defoaming operation, specifically including: If the foam height obtained again is greater than or equal to the first preset warning height but less than or equal to the first preset height, control the washing drum to continue running at the first rotation-stop ratio; Lower the emptying water level when the washing device performs the drainage operation after the washing is over to a first preset emptying water level, and control the washing device to perform rotational drainage when the washing device performs the drainage operation; Lower the dehydration acceleration of the washing drum when the washing device performs the dehydration operation after the drainage is over to a first preset acceleration, and / or lower the maximum dehydration speed of the washing drum to a first preset speed; Wherein, the first preset warning height is less than the second preset warning height, the first preset height is greater than the first preset warning height but less than the second preset warning height, and the first preset height is greater than or equal to the foam height obtained last time.

2. The defoaming method according to claim 1, wherein The step of "selectively controlling the washing device to execute the remaining set procedures or continue to perform the defoaming operation" according to the comparison result further includes: If the foam height obtained again is greater than the first preset height, reduce the rotation-stop ratio of the washing device to a second rotation-stop ratio, wherein the second rotation-stop ratio is less than the first rotation-stop ratio; Lower the emptying water level when the washing device performs the drainage operation after the washing is over to a second preset emptying water level, and control the washing device to perform rotational drainage when the washing device performs the drainage operation; Lower the dehydration acceleration of the washing drum when the washing device performs the dehydration operation after the drainage is over to a second preset acceleration, and / or lower the maximum dehydration speed of the washing drum to a second preset speed; After the dehydration of the washing device is over, obtain the set number of rinsing times of the washing device; Judge whether the set number of rinsing times is less than a first preset number; If the set number of rinsing times is less than the first preset number, increase the number of rinsing times; and / or If the set number of rinsing times is greater than or equal to the first preset number, do not adjust the number of rinsing times.

3. The defoaming method according to claim 1, characterized in that, The step of "performing different defoaming operations according to the process stage" further includes: If the washing device is in the rinsing stage, reduce the rotation frequency of the washing tub to a preset rotation frequency; After a second preset time interval, obtain the foam height in the washing tub again; Compare the foam height obtained again with the first preset warning height and the second preset height respectively; According to the comparison result, selectively control the washing device to execute the remaining set program or continue to execute the defoaming operation; Wherein, the second preset height is greater than the first preset warning height but less than the second preset warning height, and the second preset height is greater than or equal to the foam height obtained last time.

4. The defoaming method according to claim 3, wherein The step of "selectively controlling the washing device to execute the remaining set program or continue to execute the defoaming operation according to the comparison result" specifically includes: If the foam height obtained again is greater than or equal to the first preset warning height but less than or equal to the second preset height, control the washing tub to continue running at the preset rotation frequency; Reduce the emptying water level when the washing device performs the draining operation after the rinsing is over to a third preset emptying water level; After the washing device finishes draining, control the washing device to perform a spray rinsing operation and control the washing device to perform a rotational draining operation; Reduce the dehydration acceleration of the washing tub when the washing device performs the dehydration operation after draining to a third preset acceleration, and / or reduce the maximum dehydration speed of the washing tub to a third preset speed; After the washing device finishes dehydration, control the washing device to perform a spray rinsing operation again; After the washing device finishes the second spray rinsing, obtain the remaining rinsing times of the washing device; Judge whether the remaining rinsing times are greater than or equal to a second preset number of times; If the remaining rinsing times are greater than or equal to the second preset number of times, control the washing device to continue to perform the rinsing operation; and / or If the remaining rinsing times are less than the second preset number of times, control the washing device to end the operation.

5. The defoaming method according to claim 3, characterized in that The step of "selectively controlling the washing device to execute the remaining set program or continue to execute the defoaming operation according to the comparison result" further includes: If the foam height obtained again is greater than the second preset height, control the washing tub to stop rotating and make the washing device perform a draining operation; After the washing device finishes draining, control the washing device to perform a dehydration operation; After the washing device finishes dehydration, obtain the remaining rinsing times of the washing device; Judge whether the remaining rinsing times are less than a third preset number of times; If the remaining rinsing times are less than the third preset number of times, obtain the set rinsing times of the washing device; Judge whether the set rinsing times are less than a fourth preset number of times; If the set rinsing times are less than the fourth preset number of times, increase the rinsing times.

6. The defoaming method according to claim 5, wherein The step of "selectively controlling the washing device to execute the remaining set program or continue to execute the defoaming operation according to the comparison result" further includes: If the remaining number of rinsing times is greater than or equal to the third preset number of times, control the washing device to continue performing the rinsing operation; and / or If the set number of rinsing times is greater than or equal to the fourth preset number of times, control the washing device to end the operation.

7. The defoaming method according to claim 1 or 3, characterized in that, The defoaming method further includes: If the foam height obtained again is less than the first preset warning height, control the washing device to execute the remaining set program.

8. The defoaming method according to claim 1, wherein The defoaming method further includes: If the foam height is greater than the second preset warning height, control the washing tub to stop rotating; and / or If the foam height is less than the first preset warning height, do not perform the defoaming operation and continue to execute the set program.

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