Mini washing machine and foam detection method and device thereof

Abstract

The present application relates to a kind of mini washing machine and its foam detection method, device, the method comprises;Real-time detection mini washing machine direct current brushless drainage pump when working voltage;By the voltage of detected direct current brushless drainage pump when working and direct current brushless drainage pump voltage threshold value are detected to the foam in the barrel.This application detects the working current of direct current brushless drainage pump, cooperates with the value of collected water level sensor, and whether the foam in the barrel is excessive is conveniently and accurately judged, when determining that the foam is excessive, corresponding defoaming procedure is executed according to the working procedure executed by washing machine in time, reduce the influence on the drainage effect of direct current brushless drainage pump, avoid giving user bad product experience.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of washing appliances, in particular to a mini washing machine and a foam detection method and device thereof. BACKGROUND

[0002] Washing machines are essential electrical products in modern families, bringing many conveniences to people's lives. At present, most of the washing machines used by families have a relatively large capacity and are used to wash the clothes of the whole family. However, there is a risk of cross-infection of bacteria when clothes are washed together, such as underwear, baby clothes, etc.; and there is a waste phenomenon of waste water and electricity when single or small clothes are washed. Therefore, more and more users choose mini washing machines for the cleaning of these special clothes.

[0003] Due to the small structure of the mini washing machine, in order to avoid the devices in the washing machine occupying too much space of the washing clothes, some simple structure devices are selected, such as a direct-current brushless water pump as a drainage pump.

[0004] However, the mini washing machine inevitably produces foam during operation. The overflowed foam exists in the outer drum, and the direct-current brushless water pump cannot discharge the generated foam, which seriously affects the drainage effect of the direct-current brushless water pump, reduces the drainage efficiency of the mini washing machine, and even causes machine failure. However, since such direct-current brushless water pumps have no feedback signal, the washing machine cannot know the real working condition of the direct-current brushless water pump. When excessive foam causes drainage problems, the washing machine cannot know this condition, so it cannot take corresponding defoaming measures, which brings a bad product experience to the user. And the excessive foam will overflow from the water inlet and the drain, which may cause electrical safety problems (such as short circuit of the dryer fan and other devices), corrosion of washing machine parts, etc. SUMMARY

[0005] In order to achieve the above-mentioned purposes and other advantages according to the present application, the first object of the present application is to provide a mini washing machine foam detection method, comprising the following steps:

[0006] real-time detecting the voltage of the direct-current brushless drainage pump when it is working;

[0007] detecting the foam in the drum by the detected voltage of the direct-current brushless drainage pump when it is working and the direct-current brushless drainage pump voltage threshold.

[0008] Further, the direct-current brushless drainage pump voltage threshold includes a first voltage threshold and a second voltage threshold. The first voltage threshold is the voltage value when the direct-current brushless drainage pump is fully loaded and working with water in the drum of the mini washing machine. The second voltage threshold is the voltage value when the direct-current brushless drainage pump is idling and working without water in the drum of the mini washing machine.

[0009] Further, the acquisition of the direct-current brushless drainage pump voltage threshold value comprises the following steps:

[0010] Collecting the value of the water level sensor of the mini washing machine;

[0011] Determining whether there is water in the barrel according to the collected value of the water level sensor;

[0012] If the collected value of the water level sensor is greater than or equal to the first water level threshold value, it is determined that there is water in the barrel;

[0013] If the collected value of the water level sensor is less than the first water level threshold value, it is determined that there is no water in the barrel;

[0014] In the case of determining that there is water in the barrel, the voltage of the direct-current brushless drainage pump of the mini washing machine when it is working under full load is detected, which is recorded as the first voltage threshold value;

[0015] In the case of determining that there is no water in the barrel, the voltage of the direct-current brushless drainage pump of the mini washing machine when it is working under no load is detected, which is recorded as the second voltage threshold value.

[0016] Further, the detection of the foam in the barrel by comparing the detected voltage of the direct-current brushless drainage pump when it is working with the voltage threshold value comprises the following steps:

[0017] Comparing the detected voltage of the direct-current brushless drainage pump when it is working with the first voltage threshold value and the second voltage threshold value;

[0018] If the detected voltage of the direct-current brushless drainage pump when it is working is between the first voltage threshold value and the second voltage threshold value, it is determined that excessive foam is generated in the barrel of the mini washing machine.

[0019] Further, the following steps are included:

[0020] Acquiring the current working program of the mini washing machine, the working program including a washing program and a rinsing program;

[0021] Executing the defoaming program corresponding to the current working program.

[0022] Further, the execution of the defoaming program corresponding to the current working program comprises the following steps:

[0023] If the current working program of the mini washing machine is a washing program or a rinsing program, the rotation speed of the inner drum of the mini washing machine is reduced to a first target rotation speed, the direct-current brushless drainage pump is started, and the washing water in the barrel is discharged to a target water level;

[0024] If the current working program of the mini washing machine is a rinsing program, the number of rinsing is increased;

[0025] The following steps are also included:

[0026] determining whether the foam will overflow during execution of the current work program;

[0027] If it is determined that the foam will overflow, jump to the defoaming program corresponding to the execution of the current work program.

[0028] Further, the determination of whether the foam will overflow during execution of the current work program comprises the following steps:

[0029] When the current work program executed by the mini washing machine is a washing program or a rinsing program, the value of the water level sensor of the mini washing machine is collected;

[0030] Determine whether the collected water level sensor value is greater than or equal to a second water level threshold;

[0031] Yes, it is determined that the foam in the barrel will overflow;

[0032] The defoaming program corresponding to the execution of the current work program further comprises the following steps:

[0033] If the current work program executed by the mini washing machine is a washing program or a rinsing program, the rotation speed of the inner drum of the mini washing machine is reduced to a second target rotation speed, water is injected into the inner drum of the mini washing machine, and a direct-current brushless drainage pump is started to drain the washing water in the barrel to a target water level; The second target rotation speed is less than the first target rotation speed.

[0034] Further, the detection of the voltage of the direct-current brushless drainage pump when working comprises the following steps:

[0035] The motor driving current is collected by a current detection resistor connected to the power supply circuit of the direct-current brushless drainage pump to obtain a sampling voltage;

[0036] The sampling voltage is amplified through an analog signal amplifier to obtain a voltage amplification signal;

[0037] The voltage amplification signal is AD sampled to obtain the voltage of the direct-current brushless drainage pump of the mini washing machine when working.

[0038] The second object of the present application is to provide a mini washing machine foam detection device, comprising:

[0039] A voltage detection unit is used to detect the voltage of the direct-current brushless drainage pump of the mini washing machine when working in real time;

[0040] A foam detection unit is used to detect the foam in the barrel by detecting the voltage of the direct-current brushless drainage pump when working and the voltage threshold of the direct-current brushless drainage pump.

[0041] The third object of the present application is to provide a mini washing machine comprising a memory having program codes stored thereon, and a processor coupled to the memory and implementing a mini washing machine foam detection method when the program codes are executed by the processor.

[0042] Compared with the prior art, the present application has the following beneficial effects:

[0043] The present application provides a mini washing machine and a foam detection method and device thereof, which can conveniently and accurately determine whether the foam in the drum is excessive by detecting the working current of the direct-current brushless drainage pump and the value of the collected water level sensor, and execute the corresponding defoaming program according to the working program executed by the washing machine in time when the foam is determined to be excessive, thereby reducing the influence on the drainage effect of the direct-current brushless drainage pump and avoiding bringing bad product experience to the user.

[0044] The present application further determines whether the foam in the drum will overflow according to the value of the collected water level sensor, and can execute the corresponding defoaming program according to the working program executed by the washing machine in time when the foam is about to overflow, thereby preventing the foam from overflowing and effectively reducing the safety problems of the electrical appliance and the corrosion problems of the washing machine parts caused by the overflow of the foam, so as to improve the product experience of the user.

[0045] The above description is only a summary of the technical solutions of the present application, in order to more clearly understand the technical means of the present application, and the content of the specification can be implemented. The following describes the preferred embodiments of the present application in detail with reference to the accompanying drawings. The specific embodiments of the present application are described in detail by the following examples and drawings. BRIEF DESCRIPTION OF DRAWINGS

[0046] The drawings described herein are used to provide a further understanding of the present application, and form a part of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0047] Figure 1 It is a mini washing machine foam detection method flow chart;

[0048] Figure 2 It is a detection flow chart of the voltage of the direct-current brushless drainage pump of example 1 when the direct-current brushless drainage pump is working;

[0049] Figure 3 It is a sampling circuit diagram of the direct-current brushless drainage pump of example 1;

[0050] Figure 4 It is a flow chart of obtaining the voltage threshold value of the direct-current brushless drainage pump of example 1;

[0051] Figure 5 It is a principle block diagram of a mini washing machine foam detection device;

[0052] Figure 6 A mini washing machine principle block diagram. DETAILED DESCRIPTION

[0053] The application will be further described below in conjunction with the drawings and specific embodiments. It should be noted that the following described embodiments or technical features can be combined in any manner to form new embodiments without conflict.

[0054] In the following description, the suffixes such as "module", "part", or "unit" used for components are merely intended for facilitating explanation of the present application, and have no specific meaning by themselves. Therefore, "module", "part", or "unit" can be used interchangeably.

[0055] Embodiment 1

[0056] A mini washing machine foam detection method, as shown in Figure 1 , includes the following steps:

[0057] S1, real-time detection of the voltage of the mini washing machine DC brushless drainage pump during operation; as shown in Figure 2 , the detection of the voltage during operation includes the following steps:

[0058] S11, collecting the motor driving current through the current detection resistor connected to the DC brushless drainage pump power supply circuit to obtain a sampling voltage;

[0059] S12, amplifying the sampling voltage through an analog signal to obtain a voltage amplification signal;

[0060] S13, AD sampling of the voltage amplification signal to obtain the voltage of the mini washing machine DC brushless drainage pump during operation.

[0061] As shown in Figure 3The drainage pump sampling circuit diagram shown is a direct current brushless and no feedback signal. Current sampling is carried out through the R4 current detection resistor, so as to convert the motor driving current into a sampling voltage value. Assuming that the resistance value of R4 is 0.3Ω, the normal working current of the direct current brushless drainage pump is I=800mA, and the voltage across R4 is 0.3*0.8=0.24V. The voltage of 0.24V is too low for the single-chip microcomputer, and the sampled voltage needs to be amplified through the operational amplifier U1.2, and then sampled through the AD port of the MCU. In the embodiment, the circuit is a low-end current detection operational amplifier circuit, and the circuit design makes R7=R8, R5=R6, and when the sampling resistor of R4 is output to the MCU after being passed through the operational amplifier, Uout=(I*R4)*(R8 / R5). Assuming that R8 / R5=10 is designed, then Uout=0.24*10=2.4V, that is, the sampling voltage of the MCU is 2.4V at normal working time. The circuit realizes the analysis of the current condition of the direct current brushless drainage pump without signal feedback by detecting the working current of the drainage pump. That is, according to different working currents of the direct current brushless drainage pump, the sampling resistor obtains different voltages, so as to judge the working condition of the current water pump, such as the no-load state.

[0062] The detected voltage of the direct current brushless drainage pump when working and the direct current brushless drainage pump voltage threshold value are used to detect the foam in the barrel.

[0063] In the embodiment, the direct current brushless drainage pump voltage threshold value includes a first voltage threshold value and a second voltage threshold value. The first voltage threshold value is the voltage value when the direct current brushless drainage pump is full-load working with water in the barrel of the mini washing machine. The second voltage threshold value is the voltage value when the direct current brushless drainage pump is no-load working with no water in the barrel of the mini washing machine. The above-mentioned detection method of the voltage of the direct current brushless drainage pump when working and Figure 3 The circuit shown realizes the analysis of the current condition of the drainage pump without signal feedback, and judges the water level condition and the drainage condition in the barrel of the mini washing machine together with the water level sensor.

[0064] Specifically, as Figure 4 shown, the acquisition of the direct current brushless drainage pump voltage threshold value includes the following steps:

[0065] S21, collecting the value of the water level sensor of the mini washing machine; in the embodiment, the water level information in the barrel of the mini washing machine is acquired through the water level sensor, and the water level information represents the water amount at the bottom of the inner cylinder of the mini washing machine.

[0066] S22, judging whether there is water in the barrel according to the collected value of the water level sensor;

[0067] S23, judging whether the collected value of the water level sensor is greater than or equal to the first water level threshold value, S24, if yes, determining that there is water in the barrel;

[0068] S26, if the value of the water level sensor collected is less than the first water level threshold, it is determined that there is no water in the barrel;

[0069] S25, in the case of determining that there is water in the barrel, the voltage of the mini-washing machine DC brushless drainage pump when it is working under full load is detected, which is recorded as the first voltage threshold. For detailed description of the voltage detection of the mini-washing machine DC brushless drainage pump when it is working under full load, please refer to the corresponding description of the detection method of the voltage of the DC brushless drainage pump when it is working and Figure 2 , which will not be repeated here.

[0070] S27, in the case of determining that there is no water in the barrel, the voltage of the mini-washing machine DC brushless drainage pump when it is working under no load is detected, which is recorded as the second voltage threshold. For detailed description of the voltage detection of the mini-washing machine DC brushless drainage pump when it is working under no load, please refer to the corresponding description of the detection method of the voltage of the DC brushless drainage pump when it is working and Figure 2 , which will not be repeated here.

[0071] Generally, when there is more foam in the barrel, the DC brushless drainage pump works in a light load state, and in this state, the sampling current of the DC brushless drainage pump is between the full load state and the no load state. Therefore, the detection of the foam in the barrel by the detected voltage of the DC brushless drainage pump when it is working and the voltage threshold includes the following steps:

[0072] S2, comparing the detected voltage of the DC brushless drainage pump when it is working with the first voltage threshold and the second voltage threshold;

[0073] S3, determining whether the detected voltage of the DC brushless drainage pump when it is working is between the first voltage threshold and the second voltage threshold, S4, if yes, it is determined that excessive foam is generated in the barrel of the mini-washing machine; S7, if no, it is determined that no excessive foam is generated in the barrel of the mini-washing machine.

[0074] For the washing machine when executing different working programs, due to the washing products added in the early stage and the inner barrel having a certain speed, a large amount of foam will be generated in the process of washing clothes, and excessive foam will affect the normal work of the washing machine, and in severe cases, it will cause foam overflow.

[0075] In order to improve the working efficiency and stability of the washing machine, the washing machine needs to implement different defoaming measures for different execution programs. Specifically, the following steps are included:

[0076] S5, acquire the current working program of the mini washing machine, the working program including a washing program and a rinsing program; it should be understood that the full process of the mini washing machine is generally water inlet program, washing program, dehydration program, rinsing program, dehydration program; the embodiment is aimed at the washing program and the rinsing program of the mini washing machine for defoaming treatment, and is not limited to the working program of the mini washing machine only including the washing program and the rinsing program.

[0077] S6, execute the defoaming program corresponding to the current working program. Specifically, the following steps are included:

[0078] If the current working program of the mini washing machine is the washing program or the rinsing program, the rotation speed of the inner drum of the mini washing machine is reduced to a first target rotation speed, the direct-current brushless drainage pump is started, and the washing water in the barrel is drained to a target water level; by reducing the rotation speed of the inner drum of the mini washing machine, the agitation of the mini washing machine inner drum rotation to the foam is reduced, and the amount of foam generated when the mini washing machine inner drum rotates is reduced. And part of the washing water in the inner drum is discharged out of the drum, which not only avoids the overflow of the foam, but also does not affect the continuous execution of the current working program, does not interrupt the working program, and improves the working efficiency of the washing machine.

[0079] If the current working program of the mini washing machine is the rinsing program, the number of rinsing is increased to ensure the best washing effect of the clothes and avoid the trouble of additional re-rinsing caused by the user finding that the detergent on the clothes is not rinsed clean.

[0080] When the amount of foam in the inner drum of the mini washing machine exceeds the first water level threshold, in order to more specifically eliminate the foam, it is also necessary to determine whether the amount of foam will overflow in the embodiment. The washing machine executes different defoaming programs for different amounts of foam, which improves the defoaming efficiency of the washing machine. Specifically, the following steps are included:

[0081] determine whether the foam will overflow during the execution of the current working program;

[0082] When the current working program of the mini washing machine is the washing program or the rinsing program, the value of the water level sensor of the mini washing machine is collected;

[0083] determine whether the collected value of the water level sensor is greater than or equal to a second water level threshold;

[0084] Yes, it is determined that the foam in the barrel will overflow.

[0085] If it is determined that the foam will overflow, jump to execute the defoaming program corresponding to the current working program. The difference between the defoaming program here and the defoaming program corresponding to the determination that the amount of foam is excessive but will not overflow is that:

[0086] If the current work program of the mini washing machine is a washing program or a rinsing program, the rotation speed of the inner drum of the mini washing machine is reduced to a second target rotation speed, such as 0 or other target rotation speed value according to actual situation, water is injected into the inner drum of the mini washing machine, and the direct-current brushless drainage pump is started to drain the washing water in the drum to a target water level; the second target rotation speed is less than the first target rotation speed. By further reducing the rotation speed of the inner drum of the mini washing machine or directly stopping the mini washing machine, the agitation of the foam generated by the rotation of the inner drum of the mini washing machine is reduced, and the amount of foam generated when the inner drum of the mini washing machine rotates is reduced. Injecting water into the inner drum of the mini washing machine can eliminate foam, reduce the execution steps of the washing machine, and partially drain the washing water in the inner drum to the outside of the drum, which can not only avoid foam overflow, but also not affect the continuation of the current work program, and will not interrupt the work program, thereby improving the work efficiency of the washing machine.

[0087] Embodiment 2

[0088] A mini washing machine foam detection device 100, as shown in Figure 5 , comprises:

[0089] The voltage detection unit 101 is configured to detect the voltage of the direct-current brushless drainage pump of the mini washing machine in real time.

[0090] The foam detection unit 102 is configured to detect the foam in the drum by comparing the detected voltage of the direct-current brushless drainage pump with the voltage threshold of the direct-current brushless drainage pump.

[0091] For detailed description of each unit, please refer to the corresponding description in the above method embodiment, which will not be repeated here.

[0092] Embodiment 3

[0093] A mini washing machine 200, as shown in Figure 6 , comprises but is not limited to: a memory 201, which stores program code; a processor 202, which is coupled to the memory, and when the program code is executed by the processor, a mini washing machine foam detection method is realized.

[0094] Each embodiment in the specification is described in a progressive manner, and the same or similar parts of each embodiment can be referred to each other. Each embodiment focuses on the difference from other embodiments. Especially for the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the part of the method embodiment.

[0095] The above merely provides an example of the present specification, and is not intended to limit one or more embodiments of the present specification. One or more embodiments of the present specification can have various modifications and changes for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of one or more embodiments of the present specification shall be included in the scope of claims of one or more embodiments of the present specification. One or more embodiments of the present specification One or more embodiments of the present specification One or more embodiments of the present specification One or more embodiments of the present specification.

Claims

1. A mini-washing machine foam detection method, characterized by, The method comprises the following steps: Real-time detection of the voltage of the DC brushless drainage pump during operation of the mini washing machine; Detection of the foam in the drum by the detected voltage of the DC brushless drainage pump during operation and the DC brushless drainage pump voltage threshold value to determine whether the foam in the drum is excessive; The method further comprises the following steps: Obtaining the current working program of the mini washing machine, wherein the working program comprises a washing program and a rinsing program; Executing the defoaming program corresponding to the current working program; The execution of the defoaming program corresponding to the current working program comprises the following steps: If the current working program of the mini washing machine is the washing program or the rinsing program, the rotation speed of the inner drum of the mini washing machine is reduced to a first target rotation speed, the DC brushless drainage pump is started, and the washing water in the drum is drained to a target water level; If the current working program of the mini washing machine is the rinsing program, the number of rinsing is increased; The method further comprises the following steps: Determining whether the foam will overflow during execution of the current working program; The determination of whether the foam will overflow during execution of the current working program comprises the following steps: When the current working program of the mini washing machine is the washing program or the rinsing program, the value of the water level sensor of the mini washing machine is collected; Determining whether the collected value of the water level sensor is greater than or equal to a second water level threshold value; Yes, it is determined that the foam in the drum will overflow; If it is determined that the foam will overflow, the defoaming program at this time comprises the following steps: If the current working program of the mini washing machine is the washing program or the rinsing program, the rotation speed of the inner drum of the mini washing machine is reduced to a second target rotation speed, water is injected into the inner drum of the mini washing machine, and the DC brushless drainage pump is started to drain the washing water in the drum to a target water level; the second target rotation speed is less than the first target rotation speed; The detection of the voltage of the DC brushless drainage pump during operation comprises the following steps: The motor driving current is collected through the current detection resistor connected to the power supply circuit of the DC brushless drainage pump to obtain a sampling voltage; The sampling voltage is amplified through an analog signal amplifier to obtain a voltage amplification signal; The voltage amplification signal is AD sampled to obtain the voltage of the DC brushless drainage pump of the mini washing machine during operation.

2. The method of claim 1, wherein the method comprises: The DC brushless drainage pump voltage threshold value comprises a first voltage threshold value and a second voltage threshold value, the first voltage threshold value is the voltage value of the DC brushless drainage pump during full-load operation when there is water in the drum of the mini washing machine, and the second voltage threshold value is the voltage value of the DC brushless drainage pump during no-load operation when there is no water in the drum of the mini washing machine.

3. The method of claim 2, wherein the method comprises: The acquisition of the DC brushless drainage pump voltage threshold value comprises the following steps: Collecting the value of the water level sensor of the mini washing machine; Determining whether there is water in the drum through the collected value of the water level sensor; If the collected value of the water level sensor is greater than or equal to a first water level threshold value, it is determined that there is water in the drum; If the collected value of the water level sensor is less than the first water level threshold value, it is determined that there is no water in the drum; In the case where it is determined that there is water in the drum, the voltage of the DC brushless drainage pump of the mini washing machine during full-load operation is detected, which is recorded as the first voltage threshold value; In the case where it is determined that there is no water in the drum, the voltage of the DC brushless drainage pump of the mini washing machine during no-load operation is detected, which is recorded as the second voltage threshold value.

4. The method of claim 2, wherein the method is characterized by, The method for detecting the foam in the barrel by the detected voltage of the working DC brushless drainage pump and the voltage threshold value comprises the following steps: comparing the detected voltage of the working DC brushless drainage pump with the first voltage threshold value and the second voltage threshold value; if the detected voltage of the working DC brushless drainage pump is between the first voltage threshold value and the second voltage threshold value, it is determined that excessive foam is generated in the barrel of the mini washing machine.

5. A mini-washing machine foam detection device applying the method according to any one of claims 1 to 4, characterized in that, comprise: a voltage detection unit for detecting the voltage of the working DC brushless drainage pump of the mini washing machine in real time; a foam detection unit for detecting the foam in the barrel by the detected voltage of the working DC brushless drainage pump and the voltage threshold value of the DC brushless drainage pump.

6. A mini-washing machine characterized by comprising: comprise: a memory having program codes stored thereon; a processor coupled with the memory, and when the program codes are executed by the processor, the method of any one of claims 1 to 4 is implemented.

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