Draining pump and washing machine

Abstract

The invention discloses a draining pump and a washing machine. The draining pump comprises a motor coil, a power supply module, a second controller, a second power supply control module and a voltage detection module, the power module is used for obtaining low-voltage power; the second controller is connected with the power supply module; the second power supply control module is respectively connected with the alternating current power supply, the second controller and the motor coil, and is controlled by the second controller to connect or disconnect the alternating current power supply and the motor coil; the second controller is configured to control the second controller to be connected for power supply during initial power-on; the voltage detection module is connected with a power supply circuit of a motor coil and the second controller, and two detection ends are arranged to obtain a first detection voltage and a second detection voltage and transmit the first detection voltage and the second detection voltage to the second controller; the second controller is configured to judge whether semi-water exists or not according to the phase difference between the obtained first detection voltage and the second detection voltage; and if yes, the second power supply control module is controlled to cut off power supply. The integrated level of the draining pump is improved, the service life is prolonged, and the cost is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of washing equipment, and specifically relates to a drainage pump and a washing machine. Background Art

[0002] The drainage pump of the existing washing machine identifies the water level state through a water level sensor arranged in the washing machine; the power supply control module of the drainage pump and the water level sensor are respectively connected to the controller of the washing machine, and the power supply control module of the drainage pump is controlled through the water level signal detected by the water level sensor to supply power to the drainage pump or cut off the power supply of the drainage pump; configuring the water level sensor increases the cost; moreover, the service life of the water level sensor in the vibration environment of the washing machine is limited, which increases the maintenance cost of the washing machine and affects the user experience.

[0003] The above information disclosed in this background art is only used to increase the understanding of the background art of the present application. Therefore, it may include prior art that is not known to those of ordinary skill in the art. Summary of the Invention

[0004] In view of the problems in the prior art that the water level is detected by setting a water level sensor in the washing machine, and the cost of controlling the power supply operation and power-off stop operation of the drainage pump according to the water level is high and the maintenance cost is high, the present invention detects the water level by detecting the operating voltage of the drainage pump, improves the accuracy and reliability of control, reduces the cost and maintenance cost of the washing machine, and enhances the user experience.

[0005] To achieve the above invention purpose, the present invention is implemented by adopting the following technical solutions: A washing machine includes a first controller, a drainage pump, a first power supply control module, and a voltage detection module; The drainage pump is used for draining water; The first power supply control module is respectively connected to an AC power supply, the drainage pump, and the first controller, and is controlled by the first controller to connect or disconnect the AC power supply from the drainage pump; The voltage detection module is respectively connected to the power supply line of the drainage pump, and is provided with two different detection ends for obtaining a first detection voltage and a second detection voltage; the voltage detection module is connected to the first controller and transmits the obtained first detection voltage and second detection voltage to the first controller; the first controller is configured to judge whether the drainage pump is half-full of water according to the phase difference between the obtained first detection voltage and second detection voltage; and if so, control the first power supply control module to cut off the power supply.

[0006] The washing machine of the present invention obtains the phase difference between two detection terminals by detecting the first detection voltage and the second detection voltage at different positions of the operating voltage of the drain pump, and judges whether the drain pump is in a semi-water state according to the phase difference; that is, the water level of the drain pump is detected by voltage detection instead of a water level sensor, and then whether to stop the operation of the drain pump is controlled according to the obtained water level state, without relying on the state of the water level sensor to detect the water level state, improving the accuracy and reliability of water level detection, and reducing the cost and maintenance cost of the washing machine.

[0007] In some specific embodiments, the first power control module includes a live wire output terminal for connecting to the drain pump; The voltage detection module includes a plurality of series-connected voltage-dividing resistors. The two ends of the series-connected voltage-dividing resistors are respectively connected to the live wire output terminal and the neutral wire; the detection terminals include a first detection terminal and a second detection terminal, which are respectively the common terminal of the voltage-dividing resistor close to the live wire output terminal or one end of the voltage-dividing resistor, and the common terminal of the voltage-dividing resistor close to the neutral wire.

[0008] In some specific embodiments, the voltage detection module further includes a first filter circuit and a second filter circuit; The first filter circuit includes a first resistor and a first capacitor connected in parallel. The common terminal on one side is connected to the first controller and the first detection terminal, and the common terminal on the other side is grounded; The second filter circuit includes a second resistor and a second capacitor connected in parallel. The common terminal on one side is connected to the first controller and the second detection terminal, and the common terminal on the other side is grounded.

[0009] In some specific embodiments, the first controller presets a ratio threshold, which is a percentage less than 1; The first controller is configured to: Obtain multiple groups of the first detection voltage and the second detection voltage at the same time sequence; perform Fourier transform on the first detection voltage and the second detection voltage corresponding to each time sequence to obtain a first phase and a second phase; calculate the difference between the first phase and the second phase to obtain the phase difference; Judge whether the ratio of the phase difference greater than 0 reaches or exceeds the ratio threshold; if so, it is in a semi-water state, and control the first power control module to cut off the power supply; if not, judge whether the ratio of the phase difference less than 0 reaches or exceeds the ratio threshold; if so, it is in a full-water state, and control the first power control module to connect the power supply; if not, maintain the original power supply state.

[0010] A drain pump includes a motor coil, a power module, a second controller, a second power control module, and a voltage detection module; The power supply module is used to connect to an AC power supply to obtain a low-voltage power supply; The second controller is connected to the power supply module and is powered by the power supply module; The second power control module is respectively connected to the AC power supply, the second controller, and the motor coil, and is controlled by the second controller to be connected or disconnected, so that the AC power supply is connected or disconnected from the motor coil; the second controller is configured to control the second power control module to be connected and powered when initially powered on; The voltage detection module is respectively connected to the power supply lines of the motor coil, and two different detection terminals are provided for obtaining a first detection voltage and a second detection voltage; the voltage detection module is connected to the second controller and transmits the obtained first detection voltage and second detection voltage to the second controller; the second controller is configured to judge whether it is in a semi-water state according to the phase difference between the obtained first detection voltage and second detection voltage; and if so, control the second power control module to disconnect the power supply.

[0011] The drain pump of the present invention is internally provided with a second controller, a voltage detection module, and a second power control module. The first detection voltage and the second detection voltage of two detection terminals located at different positions of the operating voltage of the motor coil are detected by the voltage detection module and transmitted to the second controller; the second controller judges the operating state of the drain pump according to the phase difference between the received first detection voltage and second detection voltage, and controls the second power control module to disconnect when in a semi-water state, that is, the drain pump stops operating, so that the drain pump itself has a semi-water control and protection function, improves the intelligence and integration of the drain pump, and further improves the safety and reliability of the drain pump during use.

[0012] In some specific embodiments, the second power control module includes a live wire output terminal, which is connected to the motor coil; The voltage detection module includes a plurality of series-connected voltage-dividing resistors. The two ends of the series-connected voltage-dividing resistors are respectively connected to the live wire output terminal and the neutral wire; the detection terminals include a first detection terminal and a second detection terminal, which are respectively the common terminal of the voltage-dividing resistor close to the live wire output terminal or one end of the voltage-dividing resistor, and the common terminal of the voltage-dividing resistor close to the neutral wire.

[0013] In some specific embodiments, the voltage detection module further includes a first filter circuit and a second filter circuit; The first filter circuit includes a first resistor and a first capacitor connected in parallel. The common terminal on one side thereof is connected to the second controller and the first detection terminal, and the common terminal on the other side is grounded; The second filtering circuit includes a second resistor and a second capacitor connected in parallel. The common terminal on one side thereof is connected to the second controller and the second detection terminal, and the common terminal on the other side thereof is grounded.

[0014] In some specific embodiments, the second controller presets a proportion threshold, which is a percentage. The second controller is configured to: Obtain multiple groups of the first detection voltage and the second detection voltage with the same time sequence; perform Fourier transform on the first detection voltage and the second detection voltage corresponding to each group of time sequences to obtain a first phase and a second phase respectively; calculate the difference between the first phase and the second phase to obtain the phase difference. Judge whether the proportion of the phase difference greater than 0 reaches or exceeds the proportion threshold; if so, it is in the semi-water state, and control the second power control module to cut off the power supply; if not, judge whether the proportion of the phase difference less than 0 reaches or exceeds the proportion threshold; if so, it is in the full-water state, and control the second power control module to connect the power supply; if not, maintain the original power supply state.

[0015] In some specific embodiments, it further includes a thermal protector, which is a positive coefficient thermistor and is connected in series between the neutral line and the motor coil.

[0016] A washing machine includes a first controller, a first power control module and the above-mentioned drain pump. The first power control module is respectively connected to an AC power supply, the drain pump and the first controller, and is controlled by the first controller to connect or disconnect the AC power supply and the drain pump. The first controller is configured to: During drainage, control the first power control module to connect the power supply; when drainage is completed, control the first power control module to cut off the power supply.

[0017] The washing machine of the present invention uses a drain pump integrated with a protection function, does not need to configure a water level detection unit, reduces costs; the drain pump itself detects the water level, improves the accuracy of water level detection, extends the service life of the drain pump, and reduces maintenance costs.

[0018] After reading the specific embodiments of the present invention in conjunction with the accompanying drawings, other features and advantages of the present invention will become clearer. Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 is a schematic diagram of the electrical connection of a washing machine according to an embodiment; Figure 2 is a schematic diagram of the electrical connection of a drainage pump according to an embodiment; Figure 3 is a schematic diagram of the electrical connection of a drainage pump according to an embodiment; Figure 4 is a schematic diagram of the electrical connection of a washing machine according to an embodiment; Figure 5 is a schematic diagram of the control flow of a drainage pump according to an embodiment; Figure 6 is a schematic diagram of the control flow of a drainage pump according to an embodiment; Figure 7 is a schematic diagram of the control circuit of a washing machine according to an embodiment; Figure 8 is a schematic diagram of the control circuit of a drainage pump according to an embodiment.

[0021] In the figure, 1. Drainage pump; 2. First controller; 3. First power control module; 4. Voltage detection module; 5. AC power supply; 11. Second power control module; IC1. Second controller; 14. Motor coil; PTC1. Thermal protector; TR1. First thyristor; R1. First resistor; R2. Second resistor; R3. Third resistor; R4. Fourth resistor; R5. Fifth resistor; R6. Sixth resistor; R7. Seventh resistor; R8. Eighth resistor; R9. Ninth resistor; R10. Tenth resistor; R11. Eleventh resistor; C1. First capacitor; C2. Second capacitor; C3. Third capacitor; C4. Fourth capacitor; C5. Fifth capacitor; TR2. Second thyristor; T1. Triode; Lout. Live wire output terminal; L. Live wire; N. Neutral wire. Specific implementation manners

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0023] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0024] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In the description of the embodiments, specific features, structures, materials, or characteristics can be combined in a suitable manner in any one or more embodiments or examples.

[0025] The terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0026] In the description of the present invention, unless otherwise stated, the meaning of "a plurality" is two or more.

[0027] Referring to Figure 1 、 Figure 5 , the present invention discloses a washing machine, including a first controller 2, a drainage pump, a first power control module 3, and a voltage detection module 4.

[0028] The first controller 2 is the main controller of the washing machine. It is connected to the first power control module 3 and the voltage detection module 4, and controls the first power control module 3 to be connected or disconnected according to the voltage signal detected and output by the voltage detection module 4. The first power control module 3 is respectively connected to the drainage pump 1 and the AC power supply 5. When the first power control module 3 is connected, the AC power supply 5 is connected to the drainage pump 1 to supply power to the drainage pump 1, and the drainage pump 1 operates to drain water. When the first power control module 3 is disconnected, the AC power supply 5 is disconnected from the drainage pump 1, the drainage pump 1 is cut off from the power supply, and the drainage pump 1 stops operating due to power failure.

[0029] The voltage detection module 4 is respectively connected to the power supply line of the drainage pump 1 and is used to detect the operating voltage when the drainage pump 1 is operating. The voltage detection module 4 is provided with two different detection terminals for obtaining a first detection voltage and a second detection voltage, and transmitting the obtained first detection voltage and second detection voltage to the first controller 2.

[0030] The first controller 2 is configured to determine whether the drain pump 1 is in a semi-water state based on the phase difference between the obtained first detection voltage and the second detection voltage; that is, to obtain the phase difference between the voltages at two different detection terminals based on the obtained first detection voltage and the second detection voltage, and to determine whether the drain pump 1 is in a semi-water state based on the phase difference; the semi-water state means a working condition where the drain pump 1 is not fully immersed in water or the gas-liquid mixing ratio is unbalanced, which is likely to generate abnormal noise, low drainage efficiency, and increased power consumption.

[0031] The first controller 2 is configured to control the first power control module 3 to disconnect when it is determined that the drain pump 1 is in a semi-water state, and the drain pump 1 is powered off and stops operating.

[0032] That is, the first controller 2 controls the first power control module 3 to connect according to the drainage instruction, and the drain pump 1 operates to drain water; when the drain pump 1 is operating, the first controller 2 obtains the first detection voltage and the second detection voltage from the voltage detection module 4, and obtains the phase difference between the two detection terminals based on the first detection voltage and the second detection voltage, and determines whether the drain pump 1 is in a semi-water state based on the phase difference; if so, controls the first power control module 3 to disconnect, and the drain pump 1 loses power and stops operating.

[0033] The specific process is as follows: S1. Obtain multiple first detection voltages and second detection voltages at two detection terminals respectively; S2. Obtain the phases of two sets of first detection voltages and second detection voltages at the same time sequence; S3. Obtain the phase difference between the two detection terminals; S4. Determine whether it is in a semi-water state based on the phase difference; if so, execute S5; S5. Control the first power control module 3 to disconnect, and the drain pump 1 stops operating.

[0034] The washing machine of the present invention obtains the phase difference between two detection terminals by detecting the first detection voltage and the second detection voltage at two detection terminals at different positions of the operating voltage of the drain pump 1, and determines whether the drain pump 1 is in a semi-water state based on the phase difference; that is, detects the water level of the drain pump 1 through voltage detection instead of a water level sensor, and then controls whether the drain pump 1 stops operating according to the obtained water level state, without relying on the state detection of the water level sensor to detect the water level state, improving the accuracy and reliability of water level detection, and reducing the cost and maintenance cost of the washing machine.

[0035] The specific composition, structure, control process and principle of the washing machine of the present invention will be elaborated in detail through specific embodiments below.

[0036] In some specific embodiments, referring to Figure 1 、 Figure 5 、 Figure 7 , the first power control module 3 includes a live wire output terminal Lout, which is connected to the wiring terminal of the drain pump 1.

[0037] The voltage detection module 4 includes a plurality of series-connected voltage-dividing resistors; both ends of the series-connected voltage-dividing resistors are respectively connected to the live wire output terminal Lout and the neutral wire N; the two detection terminals are respectively the first detection terminal and the second detection terminal, which are respectively close to the common terminal of the voltage-dividing resistors near the live wire output terminal Lout or one end of the voltage-dividing resistors.

[0038] That is, the first detection terminal is respectively connected to the first detection terminal and the live wire output terminal Lout through the voltage-dividing resistors, or the second detection terminal is respectively connected to the first detection terminal through the voltage-dividing resistors and directly connected to the live wire output terminal Lout; the second detection terminal is connected to the neutral wire N through the voltage-dividing resistor; so that the first detection voltage measured by the first detection terminal and the second detection voltage measured by the second detection terminal are voltage values generated by voltage division through the voltage-dividing resistors.

[0039] The washing machine of this embodiment divides the voltage through the voltage-dividing resistors to form voltage values with different voltage drops, reduces the voltage values of the first detection voltage and the second detection voltage, reduces the detection difficulty, and improves the detection safety.

[0040] In some specific embodiments, referring to Figure 7 , the first power control module 3 controls the connection and disconnection between the live wire L of the AC power supply 5 and the live wire output terminal Lout through the first thyristor TR1.

[0041] In some specific embodiments, referring to Figure 7 , there are at least three voltage-dividing resistors, the first detection terminal is located at the common terminal of the voltage-dividing resistors close to the live wire output terminal Lout; the second detection terminal is located at the common terminal of the voltage-dividing resistors close to the neutral wire N.

[0042] In some specific embodiments, referring to Figure 7 , the three voltage-dividing resistors are respectively the series combination of the sixth resistor R6 and the seventh resistor R7, the series combination of the eighth resistor R8 and the ninth resistor R9, and the series combination of the tenth resistor R10 and the eleventh resistor R11.

[0043] In some specific embodiments, referring to Figure 7 , the voltage detection module 4 further includes a first filter circuit and a second filter circuit; the first filter circuit includes a first resistor R1 and a first capacitor C1 connected in parallel, the common terminal on one side thereof is connected to the first controller 2 and the first detection terminal, and the common terminal on the other side thereof is grounded; the second filter circuit includes a second resistor R2 and a second capacitor C2 connected in parallel, the common terminal on one side thereof is connected to the first controller 2 and the second detection terminal, and the common terminal on the other side thereof is grounded.

[0044] The washing machine of this embodiment filters the first detection voltage and the second detection voltage through the first filter circuit and the second filter circuit respectively, reduces the interference of the first detection voltage and the second detection voltage, improves their signal quality, and further improves the accuracy and reliability of the semi-water state judgment.

[0045] In some specific embodiments, refer to Figure 1 , Figure 5 , Figure 6 , Figure 7 , the first controller 2 presets a ratio threshold, which is a percentage less than 1.

[0046] The first controller 2 is configured to operate according to the following process: S1’: Obtain multiple first detection voltages and second detection voltages of two detection ends respectively; S2’: Divide the multiple first detection voltages into multiple groups; divide the multiple second detection voltages into multiple groups; and the first detection voltages of each group correspond to the second detection voltages of each group in the same time sequence. S3’: Obtain the phases of the first detection voltages of each group, which are the first phases respectively; obtain the phases of the second detection voltages of each group, which are the second phases respectively. S4’: Calculate the phase differences between the first phase and the second phase of each corresponding time sequence. S5’: Judge whether the ratio of the phase differences greater than 0 reaches or exceeds the ratio threshold; if so, execute S6’; if not, execute S7’. S6’: Confirm that the drain pump 1 is in the semi-water state, control the first power control module 3 to disconnect, and the drain pump 1 stops running due to power off. S7’: Judge whether the ratio of the phase differences less than 0 reaches or exceeds the ratio threshold; if so, execute S8’; if not, execute S9’. S8’: Confirm that the drain pump 1 is in the full-water state, control the first power control module 3 to continue to be connected, and the drain pump 1 keeps running. S9’: Control the first power control module 3 to maintain the original state, and then the state of the drain pump 1 is maintained; that is, when the first power control module 3 is disconnected, the phase difference is 0, which does not meet the judgment conditions for the semi-water state of the drain pump 1 and the full-water state of the drain pump 1, and the first power control module 3 is kept disconnected; when the first power control module 3 is connected, the drain pump 1 is in the running state. If the phase difference does not meet the judgment conditions for the semi-water state of the drain pump 1 and the full-water state of the drain pump 1, the first power control module 3 is also kept connected.

[0047] That is, the first controller 2 cyclically acquires the first detection voltage and the second detection voltage, groups the multiple first detection voltages to obtain the corresponding first phase, groups the multiple second detection voltages to obtain the corresponding second phase; calculates the difference between the first phase and the second phase group at the same time sequence of each phase, that is, the phase difference; determines whether the drain pump 1 is in a semi-water state, a full-water state, and a judgment invalid state according to the proportion of the phase difference greater than 0, and controls the first power control module 3 to be connected, disconnected, and maintained in the original state when in the semi-water state, the full-water state, and the judgment invalid state.

[0048] In some specific embodiments, the first phase and the second phase are respectively obtained by performing Fourier transform on multiple first detection voltages and multiple second detection voltages.

[0049] Specifically, Fourier transform analysis of the coil voltage phase domain is performed on multiple first detection voltages and multiple second detection voltages respectively; F(ω)=∣F(ω)∣e jθ(ω) , where θ(ω) is the first phase or the second phase.

[0050] Refer to Figure 2 , Figure 3 , Figure 5 , Figure 6 Furthermore, the present invention also discloses a drain pump 1, which includes a motor coil 14, a power supply module, a second controller IC1, a second power control module 11, and a voltage detection module 4.

[0051] The motor coil 14 is used to drive the rotor of the drain pump 1 to rotate when powered on; the power supply module is used to connect with the AC power supply 5 to obtain a low-voltage power supply and supply power to the second controller IC1.

[0052] The second controller IC1 is the internal controller of the drain pump 1, is connected to the power supply module, and is powered by the power supply module.

[0053] The second power control module 11 is respectively connected to the AC power supply 5, the second controller IC1, and the motor coil 14, and is controlled by the second controller IC1 to be connected or disconnected, so that the AC power supply 5 is connected or disconnected from the motor coil 14, and the motor coil 14 is powered or powered off.

[0054] The voltage detection module 4 is respectively connected to the power supply line of the motor coil 14. The power supply line of the motor coil 14 can be the output end of the second power control module 11 or the input end of the motor coil 14; the voltage detection module 4 is provided with two different detection ends, namely the first detection end and the second detection end, for obtaining the first detection voltage and the second detection voltage.

[0055] The voltage detection module 4 is connected to the second controller IC1 and transmits the obtained first detection voltage and second detection voltage to the second controller IC1. The second controller IC1 is configured to control the second controller IC1 to be powered on when initially powered on, and obtain the phases of the first detection terminal and the second detection terminal according to the obtained first detection voltage and second detection voltage, and determine whether the drain pump 1 is half-full of water according to the phase difference between the first phase and the second phase. And if the drain pump 1 is half-full of water, then control the second power control module 11 to cut off the power supply, and the drain pump 1 stops running.

[0056] In the drain pump 1 of the present invention, a second controller IC1, a voltage detection module 4, and a second power control module 11 are provided inside. The voltage detection module 4 detects the first detection voltage and the second detection voltage of two detection terminals at different positions of the operating voltage of the motor coil 14 and transmits them to the second controller IC1. The second controller IC1 judges the operating state of the drain pump 1 according to the phase difference of the first detection voltage and the second detection voltage received, and controls the second power control module 11 to disconnect when in the half-full water state, that is, the drain pump 1 stops running, so that the drain pump 1 has the function of half-full water control and protection by itself, improves the intelligence and integration of the drain pump 1, and further improves the safety and reliability of the drain pump 1 during use.

[0057] The following will elaborate in detail on the specific structure, control process and principle of the drain pump 1 of the present invention through specific embodiments.

[0058] In some specific embodiments, referring to Figure 2 、 Figure 3 、 Figure 5 、 Figure 6 、 Figure 8 ,the second power control module 11 includes a live wire output terminal Lout, which is connected to the motor coil 14.

[0059] The voltage detection module 4 includes a plurality of series-connected voltage-dividing resistors; both ends of the series-connected voltage-dividing resistors are respectively connected to the live wire output terminal Lout and the neutral wire N; the first detection terminal and the second detection terminal are respectively the common terminal of the voltage-dividing resistors close to the live wire output terminal Lout or one end of the voltage-dividing resistor, and the common terminal of the voltage-dividing resistors close to the neutral wire N.

[0060] That is, the first detection terminal is respectively connected to the first detection terminal and the live wire output terminal Lout through the voltage-dividing resistor, or the second detection terminal is respectively connected to the first detection terminal through the voltage-dividing resistor and directly connected to the live wire output terminal Lout; the second detection terminal is connected to the neutral wire N through the voltage-dividing resistor; so that the first detection voltage measured by the first detection terminal and the second detection voltage measured by the second detection terminal are the voltage values generated by voltage division of each voltage-dividing resistor.

[0061] The drain pump 1 of this embodiment forms voltage values with different voltage drops through a voltage-dividing resistor, reducing the voltage values of the first detection voltage and the second detection voltage, reducing the detection difficulty, and improving the safety and reliability of detection.

[0062] In some specific embodiments, referring to Figure 8 , the second power control module 11 controls the connection and disconnection between the live wire L of the AC power supply 5 and the live wire output terminal Lout through the second thyristor TR2.

[0063] In some specific embodiments, referring to Figure 8 , there are at least three voltage-dividing resistors. The first detection end is located at the common end of the voltage-dividing resistors close to the live wire output terminal Lout; the second detection end is located at the common end of the voltage-dividing resistors close to the neutral wire N.

[0064] In some specific embodiments, referring to Figure 8 , the voltage detection module 4 further includes a first filter circuit and a second filter circuit; the first filter circuit includes a first resistor R1 and a first capacitor C1 connected in parallel. The common end on one side is connected to the first controller 2 and the first detection end, and the common end on the other side is grounded; the second filter circuit includes a second resistor R2 and a second capacitor C2 connected in parallel. The common end on one side is connected to the first controller 2 and the second detection end, and the common end on the other side is grounded.

[0065] The washing machine of this embodiment filters the first detection voltage and the second detection voltage through the first filter circuit and the second filter circuit respectively, reducing the interference of the first detection voltage and the second detection voltage, improving their signal quality, and further improving the accuracy and reliability of the semi-water state judgment.

[0066] In some specific embodiments, referring to Figure 8 , it further includes a zero-crossing detection module for detecting the zero-crossing point of the AC power supply 5. The zero-crossing detection module includes a third resistor R3, a fourth resistor R4, and a fifth resistor R5 for voltage division; it also includes a third capacitor C3, a fourth capacitor C4, and a fifth capacitor C5 for respectively forming a filtering function circuit with the third resistor R3, the fourth resistor R4, and the fifth resistor R5 to filter the signal obtained by the zero-crossing detection module; it also includes a zener diode for voltage stabilization. The signal output by the zero-crossing detection module is a square wave pulse.

[0067] The second power control module 11 further includes a triode T1, which is respectively connected to the second thyristor TR2 and the second controller IC1, for the second controller IC1 to control the on and off of the second thyristor TR2 through the triode T1. And the zero-crossing detection module is connected to the second controller IC1 for providing the timing of the control signal output to the triode T1.

[0068] In some specific embodiments, referring to Figure 8, the power supply module includes a half-wave rectifier diode, a voltage stabilizing diode, and a storage capacitor to obtain a low-voltage power supply.

[0069] In some specific embodiments, referring to Figure 2 , Figure 3 , Figure 6 , Figure 8 , the second controller IC1 presets a ratio threshold, which is a percentage less than 1.

[0070] The second controller IC1 is configured to operate according to the following process: S1’. Obtain multiple first detection voltages and second detection voltages at two detection ends respectively; S2’. Divide the multiple first detection voltages into multiple groups; divide the multiple second detection voltages into multiple groups; and the first detection voltages of each group correspond to the second detection voltages of each group in the same time sequence; S3’. Obtain the phases of the first detection voltages of each group, which are the first phases respectively; obtain the phases of the second detection voltages of each group, which are the second phases respectively; S4’. Calculate the phase differences between the first phase and the second phase of each corresponding time sequence; S5’. Determine whether the ratio of the phase differences greater than 0 reaches or exceeds the ratio threshold; if so, execute S6’; if not, execute S7’; S6’. Confirm that the drainage pump 1 is in a semi-water state, control the second power supply control module 11 to disconnect, and the motor coil 14 is powered off and the rotor stops rotating; S7’. Determine whether the ratio of the phase differences less than 0 reaches or exceeds the ratio threshold; if so, execute S8’; if not, execute S9’; S8’. Confirm that the drainage pump 1 is in a full-water state, control the second power supply control module 11 to continue to be connected, and the motor coil 14 remains powered and the rotor remains rotating; S9’. Control the second power supply control module 11 to maintain the original state, and then the power supply of the motor coil 14 and the rotor state are maintained; that is, when the second power supply control module 11 is disconnected, the phase difference is 0, which does not meet the judgment conditions for the semi-water state of the drainage pump 1 and the full-water state of the drainage pump 1, and the second power supply control module 11 is kept disconnected; when the second power supply control module 11 is connected, the rotor is in a rotating state. If the phase difference does not meet the judgment conditions for the semi-water state of the drainage pump 1 and the full-water state of the drainage pump 1, the second power supply control module 11 is also kept connected.

[0071] That is, the second controller IC1 cyclically obtains the first detection voltage and the second detection voltage, groups the multiple first detection voltages to obtain the corresponding first phase, groups the multiple second detection voltages to obtain the corresponding second phase; calculates the difference between the first phase and the second phase group at the same time sequence, that is, the phase difference; determines whether the drain pump 1 is in a semi-full water state, a full water state, and a judgment invalid state according to the proportion of the phase difference greater than 0, and controls the second power control module 11 to be connected, disconnected, and maintain the original state when in the semi-full water state, the full water state, and the judgment invalid state.

[0072] In some specific embodiments, the first phase and the second phase are respectively obtained by performing Fourier transform on multiple first detection voltages and multiple second detection voltages.

[0073] Specifically, perform Fourier transform analysis on the multiple first detection voltages and the multiple second detection voltages respectively to obtain the coil voltage phase domain; obtain F(ω)=∣F(ω)∣e jθ(ω) , where θ(ω) is the first phase or the second phase.

[0074] In some specific embodiments, referring to Figure 2 、 Figure 8 , the drain pump 1 further includes a thermal protector PTC1, which is a positive coefficient thermistor, connected in series between the neutral line N and the motor coil 14, and is closely attached to the motor coil 14, adjusts the resistance according to the temperature of the motor coil 14, and achieves the purpose of high resistance disconnection and low resistance connection, thereby realizing the function of protecting the motor coil 14 from high temperature power-off.

[0075] The drain pump 1 of this embodiment increases its own thermal protection function by integrating the thermal protector PTC1 itself, improves the integration degree of the drain pump 1 and the safety and reliability of its operation, and thereby extends the life of the drain pump 1.

[0076] In some specific embodiments, referring to Figure 3 , the drain pump 1 further includes a thermal protector PTC1, which is a temperature detection unit, is closely attached to the motor coil 14 and is connected to the second controller IC1, and is used to detect the temperature signal of the motor coil 14 and transmit it to the second controller IC1; the second controller IC1 controls the second power control module 11 to be connected or disconnected according to the received temperature signal to protect the motor coil 14.

[0077] The drain pump 1 of this embodiment increases its own thermal protection function by integrating the thermal protector PTC1 itself, improves the integration degree of the drain pump 1 and the safety and reliability of its operation, and thereby extends the life of the drain pump 1.

[0078] Referring to Figure 4 , the present invention also discloses a washing machine, which includes a first controller 2, a first power control module 3, and the drain pump 1 of any one of the above embodiments.

[0079] The first power control module 3 is respectively connected to the AC power supply 5, the drain pump 1, and the first controller 2, and is controlled by the first controller 2 to be connected or disconnected, so that the AC power supply 5 is connected or disconnected from the drain pump 1, realizing the control of supplying the AC power supply 5 to the drain pump 1 and cutting off the AC power supply 5.

[0080] The first controller 2 is configured to generate a drainage instruction and control the first power control module 3 to be connected for power supply according to the drainage instruction; when the drainage is completed, control the first power control module 3 to disconnect the power supply.

[0081] The washing machine of the present invention uses a drain pump 1 integrated with a protection function, without configuring a water level detection unit, reducing costs; the drain pump 1 itself detects the water level, improving the accuracy of water level detection, prolonging the service life of the drain pump 1, and reducing maintenance costs.

[0082] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, for those of ordinary skill in the art, it is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions required to be protected by the present invention.

Claims

1. A washing machine, characterized in that: include: a first controller; A drainage pump, which is used to drain water; A first power supply control module, which is connected to the AC power supply, the drainage pump, and the first controller respectively, and is controlled by the first controller to connect or disconnect the AC power supply and the drainage pump; A voltage detection module is respectively connected to the power supply line of the drainage pump and is provided with two different detection terminals for obtaining a first detection voltage and a second detection voltage; the voltage detection module is connected to the first controller and transmits the obtained first detection voltage and the second detection voltage to the first controller; the first controller is configured to determine whether the drainage pump is half-water based on the phase difference between the obtained first detection voltage and the second detection voltage; and if so, control the first power control module to disconnect the power supply.

2. The washing machine according to claim 1, characterized in that: The first power control module includes a live wire output terminal, which is used to connect to the drainage pump; The voltage detection module includes multiple voltage-dividing resistors connected in series, and the two ends of each voltage-dividing resistor after being connected in series are respectively connected to the live wire output end and the neutral wire; the detection end includes a first detection end and a second detection end, which are respectively the common end of the voltage-dividing resistor close to the live wire output end or one end of the voltage-dividing resistor and the common end of the voltage-dividing resistor close to the neutral wire.

3. The washing machine according to claim 2, characterized in that: The voltage detection module also includes a first filtering circuit and a second filtering circuit; The first filtering circuit includes a first resistor and a first capacitor connected in parallel, a common end of one side of the first filtering circuit is connected to the first controller and the first detection end, and a common end of the other side of the first filtering circuit is grounded; The second filtering circuit includes a second resistor and a second capacitor connected in parallel, a common end on one side of which is connected to the first controller and the second detection end, and a common end on the other side of which is grounded.

4. The washing machine according to any one of claims 1 to 3, characterized in that: The first controller is preset with a percentage threshold, which is a percentage less than 1; The first controller is configured as follows: Acquire multiple groups of the first detection voltage and the second detection voltage at the same time sequence; perform Fourier transform on each group of the first detection voltage and the second detection voltage corresponding to the time sequence to obtain a first phase and a second phase; calculate the difference between the first phase and the second phase to obtain the phase difference; Determine whether the proportion of the phase difference greater than 0 reaches or exceeds the proportion threshold; If yes, it is in a semi-water state, controlling the first power control module to disconnect power supply; If not, determining whether the proportion of the phase difference being less than 0 reaches or exceeds the proportion threshold; If yes, it is in full water state, control the first power control module to connect power supply; if not, maintain the original power supply state.

5. A drainage pump, characterized in that: include: Motor coil; A power module, which is used to connect to an AC power source to obtain a low-voltage power source; A second controller, connected to the power module and powered by the power module; A second power supply control module is connected to the AC power supply, the second controller, and the motor coil, respectively, and is controlled by the second controller to connect or disconnect the AC power supply to or from the motor coil; the second controller is configured to control the second power supply control module to connect and supply power when initially powered on; A voltage detection module is respectively connected to the power supply lines of the motor coils and is provided with two different detection terminals for obtaining a first detection voltage and a second detection voltage; the voltage detection module is connected to the second controller and transmits the obtained first detection voltage and the second detection voltage to the second controller; the second controller is configured to determine whether it is half water according to the phase difference between the obtained first detection voltage and the second detection voltage; and if so, control the second power control module to disconnect the power supply.

6. The drainage pump according to claim 5, characterized in that: The second power supply control module includes a live wire output terminal connected to the motor coil; The voltage detection module includes multiple voltage-dividing resistors connected in series, and the two ends of each voltage-dividing resistor after being connected in series are respectively connected to the live wire output end and the neutral wire; the detection end includes a first detection end and a second detection end, which are respectively the common end of the voltage-dividing resistor close to the live wire output end or one end of the voltage-dividing resistor and the common end of the voltage-dividing resistor close to the neutral wire.

7. The drainage pump according to claim 6, characterized in that: The voltage detection module also includes a first filtering circuit and a second filtering circuit; The first filter circuit includes a first resistor and a first capacitor connected in parallel, a common end of one side of the first filter circuit is connected to the second controller and the first detection end, and a common end of the other side of the first filter circuit is grounded; The second filtering circuit includes a second resistor and a second capacitor connected in parallel, a common end on one side of which is connected to the second controller and the second detection end, and a common end on the other side of which is grounded.

8. The drainage pump according to any one of claims 5 to 7, characterized in that: The second controller is preset with a percentage threshold value, which is a percentage; The second controller is configured as follows: Acquire multiple groups of the first detection voltage and the second detection voltage at the same time sequence; perform Fourier transform on each group of the first detection voltage and the second detection voltage corresponding to the time sequence to obtain a first phase and a second phase; calculate the difference between the first phase and the second phase to obtain the phase difference; Determine whether the proportion of the phase difference greater than 0 reaches or exceeds the proportion threshold; If yes, it is in a semi-water state, controlling the second power control module to disconnect power supply; If not, determining whether the proportion of the phase difference being less than 0 reaches or exceeds the proportion threshold; If yes, it is in full water state, control the second power control module to connect power supply; if no, maintain the original power supply state.

9. The drainage pump according to claim 6 or 7, characterized in that: It also includes a thermal protector, which is a forward coefficient thermistor connected in series between the neutral line and the motor coil.

10. A washing machine, characterized in that: It comprises a first controller, a first power control module and the drainage pump according to any one of claims 5 to 9; The first power control module is connected to the AC power supply, the drainage pump, and the first controller respectively, and is controlled by the first controller to connect or disconnect the AC power supply and the drainage pump; The first controller is configured as follows: When draining, the first power control module is controlled to be connected to supply power; when draining is completed, the first power control module is controlled to be disconnected from supplying power.

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