Control method of washing machine

Abstract

The present invention provides a control method for a washing machine. The washing machine comprises a housing; an inner drum disposed within the housing and having an independent washing chamber for holding wash water; and an electromagnetic heating device disposed within the housing and correspondingly heating the sidewalls of the inner drum. The control method comprises controlling the electromagnetic heating device to activate heating of the inner drum during the final rinse cycle and / or spin cycle. The control method of the washing machine of the present invention achieves thermal dehydration of clothing. The electromagnetic heating device heats the inner drum, resulting in a lower moisture content of the clothing, facilitating faster air-drying, sun-drying, or drying, thereby enhancing the user experience.

Description

Technical Field

[0001] The present invention relates to the technical field of laundry equipment, and in particular to a control method for a washing machine. Background Art

[0002] Washing machines are one of the most widely used household appliances in our daily lives, freeing us from the hassles of laundry and bringing great convenience. However, existing washing machines generally consist of an inner drum and an outer tub, with multiple dewatering holes distributed on the inner drum's wall. During the washing process, the wash water between the inner and outer tubs is not used, resulting in wasted wash water. Furthermore, dirt generated during the washing process can enter the area between the inner and outer tubs with the water flow and accumulate. Over time, this accumulation of dirt can affect the washing effect and reduce the user experience.

[0003] To address the above-mentioned issues, several patents have been proposed, such as the Chinese invention patent application number 201410215346.3, entitled "A Drum Washing Machine." This invention relates to a drum washing machine comprising a housing, an inner drum and an outer drum disposed therein, a door seal disposed between the outer drum and the housing, the inner drum connected to a drive device, the inner drum being a non-porous inner drum having a tapered shape with a small diameter at the bottom and a large diameter at the mouth, the mouth of the inner drum converging inwardly in an arc, the door seal being provided with a water inlet conduit, one end of which is connected to a rapid washing water heating device, the other end of which passes through the door seal and extends into the inner drum, the outer drum being provided with a drain port and a water pressure detection device. As can be seen from the above technical solution, the inner drum of this invention is a non-porous inner drum, water is introduced into the inner drum via the water inlet conduit disposed on the door seal, and water is drained during the dehydration process by virtue of the shape of the inner drum itself. This prevents water from accumulating between the inner and outer drums, significantly saving washing water.

[0004] The aforementioned invention provides a drum washing machine with a non-porous inner drum, solving the problems of water waste and dirt accumulation between the inner and outer drums. However, some functional components required on the outer drum of traditional washing machines cannot be installed, reducing the functionality of non-porous inner drum washing machines. For example, most existing washing machines heat the wash water by installing a heating pipe in the outer drum to improve washing performance. However, washing machines without a non-porous inner drum cannot install a heating pipe on the outer drum, thus eliminating the need for heated washing. Heated washing is crucial for improving washing performance and is increasingly being adopted by a wide range of users.

[0005] To address the heating and washing problem of a washing machine with a non-porous inner drum, a Chinese invention patent application with application number 201811191414.1, entitled "A Drum Washing Machine," has been filed. The invention discloses a drum washing machine comprising a non-porous drum without dehydration holes, mounted within a housing, with a clothing inlet provided on the sidewall of the non-porous drum and a door that can be flipped open and closed to open the clothing inlet. An outer drum is fitted over the drum, and an electromagnetic heating module is provided on the outer drum to heat the interior of the outer drum and transfer the heat to the washing water in the drum. By providing the electromagnetic heating module on the outer drum, the electromagnetic field is utilized to heat the drum and the washing water within the outer drum, thereby achieving the purpose of regulating the temperature of the washing water in the washing machine drum.

[0006] The above invention patent application uses electromagnetic heating to heat the washing water of a drum washing machine with a non-porous inner drum. However, since the dehydration effect of the non-porous inner drum is not as good as that of the perforated inner drum, the moisture content of the clothes is high and the washing effect is poor.

[0007] In view of this, the present invention is proposed to reduce the moisture content of clothes washed in a washing machine with a non-porous inner drum. Summary of the Invention

[0008] In order to solve the above problems, the present invention aims to provide a control method for a washing machine with a self-cleaning function that can reduce the moisture content of washed clothes. Specifically, the following technical solutions are adopted:

[0009] A method for controlling a washing machine includes a housing; an inner drum disposed within the housing and having a washing chamber independently containing washing water; and an electromagnetic heating device disposed within the housing and correspondingly heating the side walls of the inner drum. The control method includes controlling the electromagnetic heating device to turn on heating the inner drum when the washing machine is executing a final rinse cycle and / or a spin cycle.

[0010] Furthermore, the dehydration program of the washing machine includes an accelerated dehydration stage in which the inner drum speed gradually increases and a stable dehydration stage in which the inner drum speed remains unchanged. The washing machine controls the electromagnetic heating device to start heating the inner drum at least in the accelerated dehydration stage.

[0011] Furthermore, the washing machine controls the electromagnetic heating device to remain on throughout the accelerated dehydration stage, and to be turned off when entering the stable dehydration stage.

[0012] Furthermore, the washing machine controls the electromagnetic heating device to be turned on at set time intervals during the stable dehydration stage.

[0013] Furthermore, the stable dehydration stage includes a low-speed stable dehydration stage and a high-speed stable dehydration stage. The washing machine controls the electromagnetic heating device to be turned on at intervals of a first set time interval T1 in the low-speed stable dehydration stage, and to be turned on at intervals of a second set time interval T2 in the high-speed stable dehydration stage. The second set time interval T2 is greater than or equal to the first set time interval T1.

[0014] Furthermore, the electromagnetic heating power of the electromagnetic heating device is adjustable, and the washing machine controls the heating power of the electromagnetic heating device in the accelerated dehydration stage to be greater than the heating power in the stable dehydration stage;

[0015] Preferably, the washing machine controls the electromagnetic heating device to heat the inner drum with a first heating power P1 in the low-speed stable dehydration stage, heats the inner drum with a second heating power P2 in the accelerated dehydration stage, and heats the inner drum with a third heating power P3 in the high-speed stable dehydration stage, wherein the second heating power P2>the first heating power P1≥the third heating power P3.

[0016] Furthermore, the last rinsing program of the washing machine includes a rinsing water inlet stage, a rinsing washing stage and a rinsing drainage stage, and the washing machine controls the electromagnetic heating device to be turned on at least in the rinsing drainage stage.

[0017] Furthermore, a drainage hole is provided on the side wall of the inner drum, and a centrifugal drainage mechanism for controlling the opening and closing of the drainage hole is installed on the drainage hole. The centrifugal drainage mechanism keeps the drainage hole in a normally closed state. When the rotation speed of the inner drum reaches V0, the centrifugal drainage mechanism opens the drainage hole due to the centrifugal force of the inner drum rotation.

[0018] When the washing machine performs the last rinse program, the inner drum is controlled to rotate at a speed of V0, enters the rinsing and draining stage, and the electromagnetic heating device is controlled to turn on. When the inner drum continues to rotate at the speed of V0 for a set time T0, the electromagnetic heating device is controlled to turn off.

[0019] Furthermore, the electromagnetic heating power of the electromagnetic heating device is adjustable, and the washing machine controls the heating power of the electromagnetic heating device in the rinsing and draining stage to be greater than the heating power in other rinsing stages;

[0020] Preferably, the washing machine controls the electromagnetic heating device to heat the inner drum at a fourth heating power P4 during the rinsing water inlet stage and to heat the inner drum at a fifth heating power P5 during the rinsing water outlet stage, and the fourth heating power P4 ≤ the fifth heating power P5.

[0021] Furthermore, the electromagnetic heating power of the electromagnetic heating device is adjustable, and the main controller of the washing machine stores the corresponding relationship between the laundry load range of the washing machine and the electromagnetic heating power:

[0022] When the washing machine detects that the laundry load is in a corresponding laundry load interval, the washing machine controls the electromagnetic heating device to perform heating at an electromagnetic heating power corresponding to the load interval.

[0023] The present invention provides a washing machine that eliminates the need to fill wash / rinse water between the inner and outer drums, significantly reducing washing water consumption. This prevents the accumulation of dirt between the inner and outer drums, significantly improving user health and user experience while significantly conserving water resources. Furthermore, the washing machine of this embodiment utilizes an electromagnetic heating device to achieve contactless heating of the inner drum, thereby heating the wash water within the inner drum. This achieves the heating and washing function of a washing machine with a non-porous inner drum, improving the washing effect.

[0024] The control method of the washing machine of the present invention includes controlling an electromagnetic heating device to activate heating of the inner drum during the final rinse cycle and / or the spin cycle. This method achieves thermal dehydration of clothing. The electromagnetic heating device heats the inner drum, reducing the moisture content of the clothing, facilitating rapid air drying, sun drying, or drying, thereby enhancing the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A front view of a washing machine according to an embodiment of the present invention;

[0026] Figure 2 The second embodiment of the present invention is a washing machine along Figure 1 Cross-sectional view of the middle XX plane;

[0027] Figure 3 The third embodiment of the present invention is a washing machine along Figure 1 Cross-sectional view of the middle XX plane.

[0028] Explanation of the numbers in the accompanying drawings: 1-shell 2-door 3-main controller 4-outer cylinder 5-inner cylinder 6-lifting rib 7-electromagnetic heating driver 8-electromagnetic heating coil 9-base 10-packaging structure 11-drain pipe 12-magnetic strip 13-drainage device 14-inner cylinder door 15-sealed cabin structure 16-detergent dispenser box 17-upper panel 18-electromagnetic induction coil. DETAILED DESCRIPTION

[0029] A control method for a washing machine of the present invention is described in detail below with reference to the accompanying drawings:

[0030] Example 1

[0031] A washing machine of this embodiment includes a housing; an inner drum disposed in the housing and having a washing chamber independently containing washing water; and an electromagnetic heating device disposed in the housing for correspondingly heating the side walls of the inner drum.

[0032] This embodiment provides a washing machine that eliminates the need to fill wash / rinse water between the inner and outer drums, significantly reducing washing water consumption. This prevents dirt from accumulating between the inner and outer drums, significantly improving user health and user experience while significantly conserving water resources. Furthermore, the washing machine of this embodiment utilizes an electromagnetic heating device to achieve contactless heating of the inner drum, thereby heating the wash water within the inner drum. This achieves the heating and washing function of a washing machine with a non-porous inner drum, improving the washing effect.

[0033] In this embodiment, an outer drum is provided in the shell of the washing machine, the inner drum is provided in the outer drum, and the electromagnetic heating device is provided on the side wall of the outer drum; alternatively, the shell of the washing machine in this embodiment does not have an outer drum, and the electromagnetic heating device is directly provided on the inner wall of the shell and opposite to the side wall of the inner drum.

[0034] The control method of this embodiment of a washing machine includes controlling an electromagnetic heating device to activate heating of the inner drum during the final rinse cycle and / or the spin cycle. This embodiment achieves thermal dehydration of clothing. The electromagnetic heating device heats the inner drum, reducing the moisture content of the clothing, facilitating faster air drying, sun drying, or drying, thereby enhancing the user experience.

[0035] Furthermore, the dehydration program of the washing machine in this embodiment includes an accelerated dehydration stage in which the inner drum speed gradually increases and a stable dehydration stage in which the inner drum speed remains unchanged. The washing machine controls the electromagnetic heating device to start heating the inner drum at least in the accelerated dehydration stage.

[0036] When the washing machine of this embodiment executes the dehydration program, the inner drum rotates centrifugally at high speed, thereby forming a "thin centrifugal water layer" on the wall of the inner drum. At this time, the electromagnetic heating device is controlled to start heating the inner drum, achieving a high temperature of about 100°C, heating and drying the wet clothes to reduce the moisture content.

[0037] The control method of the washing machine of this embodiment controls the electromagnetic heating device to start heating the inner drum during the accelerated dehydration stage of the dehydration program. For example, the electromagnetic heating stops stably at 600 rpm and starts to heat the inner drum during the process of increasing the speed to 800 rpm; the electromagnetic heating stops stably at 800 rpm and starts to heat the inner drum during the process of increasing the speed to 1000 rpm; the electromagnetic heating stops stably at 1000 rpm and starts to heat the inner drum during the process of increasing the speed to 1200 rpm; the electromagnetic heating stops stably at 1200 rpm and starts to heat the inner drum during the process of increasing the speed to 1400 rpm. When the speed is stable, there is little "centrifugal thin water layer", which prevents the electromagnetic module from heating the inner drum too high and damaging the clothes.

[0038] As an implementation of this embodiment, the washing machine controls the electromagnetic heating device to remain on throughout the accelerated dehydration stage and to be turned off when entering the stable dehydration stage.

[0039] As another implementation of this embodiment, the washing machine controls the electromagnetic heating device to operate at set intervals during the stable spin cycle. Because the "centrifugal thin water layer" is minimal during the stable spin cycle, this intermittent heating method can avoid energy loss and reduce the moisture content of the clothes to a certain extent.

[0040] Specifically, the stable dehydration stage includes a low-speed stable dehydration stage and a high-speed stable dehydration stage. The washing machine controls the electromagnetic heating device to be turned on at intervals of a first set time interval T1 in the low-speed stable dehydration stage, and to be turned on at intervals of a second set time interval T2 in the high-speed stable dehydration stage. The second set time interval T2 is greater than or equal to the first set time interval T1.

[0041] As an implementation of this embodiment, the electromagnetic heating power of the electromagnetic heating device is adjustable, and the washing machine controls the heating power of the electromagnetic heating device in the accelerated dehydration stage to be greater than the heating power in the stable dehydration stage.

[0042] Preferably, the washing machine controls the electromagnetic heating device to heat the inner drum with a first heating power P1 in the low-speed stable dehydration stage, heats the inner drum with a second heating power P2 in the accelerated dehydration stage, and heats the inner drum with a third heating power P3 in the high-speed stable dehydration stage, wherein the second heating power P2>the first heating power P1≥the third heating power P3.

[0043] As one implementation of this embodiment, the final rinse cycle of the washing machine of this embodiment includes a rinse water filling phase, a rinse washing phase, and a rinse drain phase. The washing machine controls the electromagnetic heating device to be activated during at least the rinse drain phase. This embodiment controls the electromagnetic heating device to be activated during the rinse process to heat the inner drum. After heating the clothes, the spin cycle begins, achieving a "hot spin" effect, improving the spin efficiency and further reducing the moisture content of the clothes.

[0044] Furthermore, a drainage hole is provided on the side wall of the inner cylinder, and a centrifugal drainage mechanism for controlling the opening and closing of the drainage hole is installed on the drainage hole. The centrifugal drainage mechanism keeps the drainage hole in a normally closed state. When the rotation speed of the inner cylinder reaches V0, the centrifugal drainage mechanism opens the drainage hole due to the centrifugal force of the inner cylinder rotation.

[0045] During the final rinse cycle, the washing machine controls the inner drum to rotate at a speed of V0, entering the rinse and drain phase. The electromagnetic heating device is turned on. After the inner drum rotates at V0 for a set time T0, the electromagnetic heating device is turned off. During the rinse and drain phase, a "thin centrifugal water layer" forms on the inner drum wall. At this time, the electromagnetic heating device is controlled to activate and heat the inner drum, achieving a high temperature of approximately 100°C, drying the wet clothes and further reducing the moisture content.

[0046] Furthermore, the electromagnetic heating power of the electromagnetic heating device is adjustable, and the washing machine controls the heating power of the electromagnetic heating device in the rinsing and draining stage to be greater than the heating power in other rinsing stages.

[0047] Preferably, the washing machine controls the electromagnetic heating device to heat the inner drum at a fourth heating power P4 during the rinsing water inlet stage and to heat the inner drum at a fifth heating power P5 during the rinsing water outlet stage, and the fourth heating power P4 ≤ the fifth heating power P5.

[0048] As an implementation of this embodiment, the electromagnetic heating power of the electromagnetic heating device is adjustable, and the main controller of the washing machine stores the corresponding relationship between the laundry load range of the washing machine and the electromagnetic heating power:

[0049] When the washing machine detects that the laundry load is in a corresponding laundry load interval, the washing machine controls the electromagnetic heating device to perform heating at an electromagnetic heating power corresponding to the load interval.

[0050] Example 2

[0051] like Figure 1 and Figure 2 As shown, this embodiment provides a washing machine, comprising:

[0052] outer cylinder 4;

[0053] Inner tube 5, arranged in outer tube 4;

[0054] The electromagnetic heating coil 8 is arranged on the outer cylinder 4;

[0055] and an electromagnetic heating driver 7, electrically connected to the electromagnetic heating coil 8, the electromagnetic heating driver 7 rectifies the alternating current into direct current, and then converts the direct current into high-frequency alternating current;

[0056] The electromagnetic heating driver 7 outputs high-frequency alternating current to the electromagnetic heating coil 8, thereby generating a high-frequency alternating magnetic field. In the high-frequency alternating magnetic field, the inner tube 5 generates eddy currents due to electromagnetic induction, thereby heating the water in the inner tube 5.

[0057] When the heating / drying program of the washing machine of this embodiment is started, the current and voltage are converted into direct current by the electromagnetic heating driver 7, so that the direct current becomes high-frequency alternating current exceeding the audio frequency. The high-frequency alternating current with a frequency of 0-100 kHz is output to the electromagnetic heating coil 8, thereby generating a high-frequency alternating magnetic field. The electromagnetic induction lines act on the metal inner drum, and strong eddy currents are generated in the metal inner drum due to electromagnetic induction. When the eddy currents overcome the internal resistance of the inner drum and flow, the electrical energy is converted into thermal energy, thereby heating the inner drum and heating the water in the inner drum.

[0058] Preferably, the washing machine of this embodiment is a front-loading drum washing machine with a hole-free inner drum. This simple structure eliminates the need to fill wash / rinse water between the inner and outer drums, significantly reducing the amount of water used. This prevents dirt from accumulating between the inner and outer drums, significantly improving user health and user experience while significantly conserving water resources.

[0059] The washing machine of this embodiment adopts a non-porous inner drum, which independently holds washing water during washing. The resistance wire heating method of traditional washing machines cannot achieve the heating of washing water in the non-porous inner drum washing machine. Since the inner drum needs to rotate during the washing process, it is also impossible to set a heating device in the inner drum to heat the water in the inner drum. Therefore, the non-porous inner drum washing machine of this embodiment heats the side wall of the inner drum 5 through the electromagnetic heating coil 8. The side wall of the inner drum 5 is heated by the electromagnetic heating coil 8 and then transfers heat to the washing water in the inner drum 5, thereby heating the washing water.

[0060] Furthermore, existing washing machines use resistance wire heating, which heats the wire directly by immersing it in water. Due to the complex water quality environment, scale accumulates on the resistance wire over time, and the installation location makes it difficult to clean. This results in a gradual decrease in heating efficiency and even damage. This embodiment, however, uses an electromagnetic heating device to achieve non-contact heating, which avoids these problems, significantly extends the service life, and maintains long-term high-efficiency heating.

[0061] In order to achieve electromagnetic heating, the inner tube of this embodiment is made of iron material, which can cut the alternating magnetic lines of force generated by the electromagnetic heating coil 8 and generate alternating current (i.e., eddy current). The eddy current causes the carriers on the side wall of the inner tube to move irregularly at high speed. The carriers collide and rub against each other to generate heat energy to heat the water in the inner tube.

[0062] As an implementation of this embodiment, the electromagnetic heating coil 8 described in this embodiment is arranged on the inner wall surface of the circumferential side wall of the outer tube 4, and the electromagnetic heating coil 8 is encapsulated by an encapsulation structure 10 of insulating material, and the encapsulation structure 10 has a connection structure for connecting to the outer tube.

[0063] The electromagnetic heating coil 8 described in this embodiment is a high-frequency resonant coil. The coil is wound concentrically with copper wire. The electromagnetic heating coil 8 is encapsulated by the encapsulation structure 10 to avoid contact between water and the electromagnetic induction coil 18, thereby improving reliability and safety.

[0064] As an implementation of this embodiment, a plurality of magnetic strips 12 are installed on the back of the electromagnetic heating coil 8 and the electromagnetic induction coil 18 of this embodiment to absorb magnetic flux lines and reduce leakage of magnetic flux lines.

[0065] As one implementation of this embodiment, the washing machine further includes a resonant circuit electrically connected to the electromagnetic heating driver and a temperature detection circuit coupled to the resonant circuit. In this embodiment, the temperature detection circuit detects the current fed back to the electromagnetic heating driver 7 and uses this feedback to measure the water temperature within the inner drum 5.

[0066] As one implementation of this embodiment, the outer cylinder 4 is provided with a positioning device comprising a retractable positioning post. The inner cylinder 5 has a positioning hole for engaging with the positioning post. The positioning post of the positioning device extends and engages with the positioning hole to lock the inner cylinder 5. This embodiment utilizes the positioning device to lock the inner cylinder 5, while simultaneously detecting and feedbacking the current of the electromagnetic heating driver 7 to provide feedback and determine the water temperature within the inner cylinder 5. This method can improve temperature measurement accuracy.

[0067] The drum washing machine of this embodiment has a casing 1, which includes: an upper panel 17, a front panel, a back panel and a bottom panel. A foot 9 is fixedly mounted on the bottom panel to support the entire washing machine. The casing 1 has an outer drum 4 inside, and an inner drum 5 is coaxially arranged inside the outer drum 4. The main purpose of the outer drum 4 is to collect the drainage of the inner drum 5 and the drainage of the high-speed centrifugal dehydration of the inner drum 5. The inner drum 5 rotates, and preferably, lifting ribs 6 are provided to continuously lift, drop and beat the clothes so as to clean the clothes. The inner drum 5 is a non-porous structure, and the outer drum 4 has a central mounting hole with a bearing fixed thereto. The inner drum shaft, which is fastened to the inner drum 5, passes through the bearing shown and is connected to the drive motor. An openable / closable inner drum door 14 is installed on the front tube mouth of the inner drum 5, thereby realizing that the inner drum 5 is a sealed cabin structure 15.

[0068] In order to allow water to enter the hole-free inner drum of this embodiment, the driving motor of the drum washing machine of this embodiment is connected to the inner drum 5 through the inner drum shaft to drive the inner drum 5 to rotate. The inner drum shaft has a hollow channel connected to the interior of the inner drum 5, and the water inlet pipe of the washing machine is connected to the hollow channel of the inner drum shaft.

[0069] In this embodiment, the inner cylinder 5 is provided with an air pressure balancing mechanism for connecting the inner cylinder 5 with the external environment to balance the air pressure inside the inner cylinder.

[0070] When water enters, the pressurized gas in the sealed compartment of the inner tube can overflow through the balancing mechanism to ensure air pressure balance.

[0071] When the water supply is suddenly cut off, the external atmosphere can quickly enter the sealed compartment of the inner tube and destroy the back suction, ensuring the air pressure balance and preventing the washing water from being sucked into the tap water network.

[0072] For example, during dehydration, the air pressure balancing mechanism can also ensure the air pressure balance in the inner drum.

[0073] As an implementation method of this embodiment, the air pressure balancing mechanism includes a pressure equalizing channel arranged on the inner tube 5, and one end of the pressure equalizing channel connected to the interior of the inner tube 5 is arranged on the inner tube 5 near the rotation center axis and is always higher than the highest water level position in the inner tube 5.

[0074] Specifically, the pressure equalizing channel is opened on the inner cylinder shaft to connect the inner cylinder 5 with the external environment, and the highest water level in the inner cylinder 5 is lower than the inner cylinder shaft. This can prevent the water in the inner cylinder 5 from flowing out of the pressure equalizing channel.

[0075] The pressure-equalizing channel in this embodiment includes a first channel section and a second channel section. The first channel section is arranged parallel to the hollow passage, with one end communicating with the interior of the inner cylinder. The second channel section has one end connected to the first channel section and the other end extending to the outer circumferential wall of the inner cylinder shaft to communicate with the interior of the outer cylinder. Preferably, the second channel section is arranged perpendicular to the first channel section to form an L-shaped pressure-equalizing channel.

[0076] This embodiment provides a front-loading drum washing machine with an inner drum. An inner drum door 14 is provided on the inner drum 5 to achieve washing in a closed space of the inner drum 5, thereby preventing the clothes in the inner drum 5 from coming out, and preventing the clothes from being compressed or hit, causing water to flow out of the inner drum or splash out of the inner drum, thereby avoiding the possibility of dirt adhering between the inner and outer drums, and truly achieving water-free operation between the drums.

[0077] The washing machine of this embodiment has a door lock detection device that ensures that the inner drum door is locked in place, ensuring that the inner drum door is locked in place and the locking judgment accuracy is 100%. Since the drum dehydration speed can reach 1600 rpm, if the inner drum door on the inner drum is not locked properly, a safety accident will occur, which greatly improves the safety of the machine, user health and user experience.

[0078] To achieve drainage of the non-porous inner drum, a drainage hole is provided on the sidewall of the inner drum in this embodiment. A centrifugal drainage mechanism is installed in the drainage hole. The centrifugal drainage mechanism keeps the drainage hole normally closed, forming a non-porous inner drum that independently holds wash water. When drainage is required, the inner drum is controlled to rotate at high speed. The centrifugal mechanism, under the centrifugal effect of the high-speed rotation, opens the drainage hole, and the wash water is discharged through the drainage hole. Preferably, the centrifugal drainage mechanism is located in the internal cavity of the lifting rib 6.

[0079] The front panel of the housing of this embodiment has a clothing inlet and a door 2 installed on the clothing inlet to control the opening and closing of the clothing inlet.

[0080] In this embodiment, a main controller 3 of the washing machine is provided on the upper portion of the front plate of the housing, and a detergent delivery box 16 is provided above the outer tub 4 inside the housing 1 for delivering detergent.

[0081] In this embodiment, the bottom of the outer cylinder 4 is connected to a drainage device 13 , and the drainage device 13 is connected to a drainage pipe 11 for leading water out of the shell 1 .

[0082] This embodiment also provides a control method for a washing machine. When the washing machine is heating the water in the inner drum, the water temperature in the inner drum is measured by detecting, analyzing and calculating the current feedback of the electromagnetic heating driver 7 .

[0083] The washing machine of this embodiment heats the washing water by electromagnetic heating, and measures the washing water heating temperature by using an integrated resonant circuit.

[0084] During the electromagnetic heating process, the temperature of the electromagnetic heating coil 8 does not change much, but the wall temperature of the inner tube is consistent with the water temperature, which causes the wall temperature of the inner tube to rise and the resistance to increase. The resistance is a variable RT.

[0085] The eddy currents in the metal inner drum also affect the electromagnetic heating coil 8, forming an oscillating circuit. The electromagnetic heating coil 8 itself has a resistance R, and the eddy currents in the metal inner drum also create a variable resistance Rx on the electromagnetic heating coil 8. This further affects the current of the electromagnetic heating driver, which is analyzed and calculated, and then fed back to measure the water temperature in the inner drum.

[0086] Therefore, the washing machine of this embodiment uses the electromagnetic heating principle to measure the water temperature in the inner drum 5 through the mutual electromagnetic induction changes between the electromagnetic heating coil 8 and the wall of the metal inner drum, which reduces the setting of temperature sensors, simplifies the structure of the washing machine, and reduces the cost of the washing machine.

[0087] Furthermore, the main controller of the washing machine stores the set current intervals N1, N2, ..., Nn of the electromagnetic heating driver corresponding to the set water temperatures T1, T2, ..., Tn respectively. When the washing machine is heating the water in the inner drum, when the detection, analysis and calculation show that the current I of the electromagnetic heating driver is in the set current interval Nn, the water temperature in the inner drum of the washing machine is Tn.

[0088] The washing machine of this embodiment controls the inner drum to rotate during the process of heating the water in the inner drum. By continuously rotating the inner drum to even out the temperature, the temperature of the entire surface of the inner drum is uniform, and the water in the inner drum exchanges heat with the inner drum, thereby being evenly heated.

[0089] To measure the temperature of the water in the inner drum, as one implementation of this embodiment, the washing machine controls the inner drum's rotation while heating the water therein. The water temperature is measured at set intervals t0 by detecting, analyzing, and calculating the current feedback from the electromagnetic heating driver. This allows for simultaneous temperature measurement without affecting the heating process, making it simple and convenient.

[0090] To measure the temperature of the water in the inner drum, as one implementation of this embodiment, the washing machine controls the inner drum to rotate while heating the water therein. After a set time interval t0, the inner drum is stopped, and the positioning post of the positioning device is extended to engage with the positioning hole, locking the inner drum. The water temperature in the inner drum is then measured by detecting, analyzing, and calculating the current feedback from the electromagnetic heating driver. This method, by locking the inner drum with the positioning device before measuring the temperature, avoids current fluctuations and provides more accurate measurement results.

[0091] As an implementation of this embodiment, the washing machine controls and adjusts the heating power of the electromagnetic heating coil according to the process of heating the water in the inner drum.

[0092] The heating power of this embodiment can be adjusted to meet different working conditions:

[0093] Variable power electromagnetic heating is performed according to the load, set temperature, water level and other parameters: for example, high power heating can be performed under high water level and high load conditions; low power heating can be performed under low water level and small load conditions.

[0094] For example, the electromagnetic heating power is relatively high in the early stage, and when it is about to reach the set temperature, low-power heating is performed to achieve precise temperature heating.

[0095] For example, if the user sets the high temperature to 90℃ for washing, high-power heating can be used to shorten the time; if the user sets the low temperature to 30℃ for washing, low-power electromagnetic heating can be used.

[0096] There are multiple ways to adjust the power of electromagnetic heating in the washing machine of this embodiment, including:

[0097] The washing machine increases the excitation pulse frequency through the electromagnetic heating driver. When the working circuit is in an unadjusted state, the heating power of the electromagnetic heating coil can be reduced.

[0098] Alternatively, the washing machine applies excitation pulses through the electromagnetic heating driver intermittently, so that the electromagnetic heating coil heats the inner drum intermittently, and the interval time of the intermittent heating of the inner drum is controlled to adjust the electromagnetic heating power of the washing machine;

[0099] Alternatively, the electromagnetic heating driver is a controllable rectifier module, and the heating power of the electromagnetic heating coil is changed by controlling the voltage to change the DC output voltage after rectification of the controllable rectifier module.

[0100] Example 3

[0101] like Figure 1-Figure 3 As shown, this embodiment provides a washing machine, comprising:

[0102] outer cylinder 4;

[0103] Inner tube 5, arranged in outer tube 4;

[0104] The electromagnetic heating coil 8 is arranged on the outer cylinder 4;

[0105] The electromagnetic induction coil 18 is provided on the inner cylinder 5 and is located at a position opposite to the electromagnetic heating coil 8 .

[0106] The washing machine of this embodiment uses electromagnetic heating coil 8 to electromagnetically heat the metal wall of the inner drum 5. The inner drum 5 heats the wash water within the drum, achieving the washing machine's heating and washing function. To address the heating method using electromagnetic heating coil 8, this embodiment includes an electromagnetic induction coil 18 installed in the inner drum. During the heating process, the alternating magnetic field generated by electromagnetic induction coil 18 reacts to electromagnetic heating coil 8. Because electromagnetic induction coil 18 is installed within the inner drum 5, as the water temperature rises, the eddy current within the heated electromagnetic induction coil 18 changes, and the alternating magnetic field acting on electromagnetic heating coil 8 also changes. Electromagnetic induction coil 18 influences electromagnetic heating coil 8 to form an oscillating circuit. Electromagnetic heating coil 8 itself has a resistance R, and electromagnetic induction coil 18 forms a variable resistance R2 for electromagnetic heating coil 8. Furthermore, this influences the current of the electromagnetic heating driver of electromagnetic heating coil 8. By analyzing and calculating the current of the electromagnetic heating driver, feedback is provided to measure the water temperature within the inner drum 5.

[0107] Therefore, the washing machine of this embodiment utilizes the electromagnetic heating principle to measure the water temperature in the inner drum 5 by the mutual electromagnetic induction changes between the electromagnetic heating coil 8 and the electromagnetic induction coil 18, thereby reducing the number of temperature sensors, simplifying the structure of the washing machine, and reducing the cost of the washing machine.

[0108] Preferably, the washing machine of this embodiment is a front-loading drum washing machine with a hole-free inner drum. This simple structure eliminates the need to fill wash / rinse water between the inner and outer drums, significantly reducing the amount of water used. This prevents dirt from accumulating between the inner and outer drums, significantly improving user health and user experience while significantly conserving water resources.

[0109] The washing machine of this embodiment adopts a non-porous inner drum, which independently holds washing water during washing. The resistance wire heating method of traditional washing machines cannot achieve the heating of washing water in the non-porous inner drum washing machine. Since the inner drum needs to rotate during the washing process, it is also impossible to set a heating device in the inner drum to heat the water in the inner drum. Therefore, the non-porous inner drum washing machine of this embodiment heats the side wall of the inner drum 5 through the electromagnetic heating coil 8. The side wall of the inner drum 5 is heated by the electromagnetic heating coil 8 and then transfers heat to the washing water in the inner drum 5, thereby heating the washing water.

[0110] Furthermore, existing washing machines use resistance wire heating, which heats the wire directly by immersing it in water. Due to the complex water quality environment, scale accumulates on the resistance wire over time, and the installation location makes it difficult to clean. This results in a gradual decrease in heating efficiency and even damage. This embodiment, however, uses an electromagnetic heating device to achieve non-contact heating, which avoids these problems, significantly extends the service life, and maintains long-term high-efficiency heating.

[0111] In order to achieve electromagnetic heating, the inner tube of this embodiment is made of iron material, which can cut the alternating magnetic lines of force generated by the electromagnetic heating coil 8 and generate alternating current (i.e., eddy current). The eddy current causes the carriers on the side wall of the inner tube to move irregularly at high speed. The carriers collide and rub against each other to generate heat energy to heat the water in the inner tube.

[0112] Furthermore, the electromagnetic heating coil 8 described in this embodiment is disposed on the bottom of the circumferential sidewall of the outer cylinder 4, and the electromagnetic induction coil 18 is disposed on the inner surface of the circumferential sidewall of the inner cylinder 5. During the rotation of the inner cylinder, the electromagnetic induction coil 18 and the electromagnetic heating coil 8 are located in the same radial direction with respect to the outer cylinder 4. Thus, during the heating process, the inner cylinder 5 needs to be controlled to rotate until the electromagnetic induction coil 18 and the electromagnetic heating coil 8 are in an opposing position to achieve temperature measurement.

[0113] In order to ensure that the electromagnetic induction coil 18 and the electromagnetic heating coil 8 are in relative positions to achieve temperature measurement, a positioning device is provided on the outer cylinder 4 described in this embodiment. The positioning device has a retractable positioning column, and the inner cylinder 5 has a positioning hole for cooperating with the positioning column; when the positioning column of the positioning device is extended to cooperate with the positioning hole to lock the inner cylinder, the electromagnetic induction coil 18 and the electromagnetic heating coil 8 are in relative positions.

[0114] As one implementation of this embodiment, the electromagnetic induction coil 18 is encapsulated by an insulating encapsulation structure 10, which includes a connection structure for connecting to the inner cylinder. Furthermore, the electromagnetic heating coil 8 is disposed on the inner wall surface of the circumferential sidewall of the outer cylinder 4, encapsulated by the insulating encapsulation structure 10, which includes a connection structure for connecting to the outer cylinder.

[0115] The electromagnetic heating coil 8 and electromagnetic induction coil 18 described in this embodiment are high-frequency resonant coils, wound concentrically with copper wire. The electromagnetic induction coil 18 and electromagnetic heating coil 8 are encapsulated by an encapsulation structure 10, preventing water from contacting the electromagnetic induction coil 18 and improving reliability and safety.

[0116] The washing machine of this embodiment also includes an electromagnetic heating driver 7 electrically connected to the electromagnetic heating coil 8. The electromagnetic heating driver 7 rectifies the alternating current into direct current, and then converts the direct current into high-frequency alternating current. The electromagnetic heating driver 7 outputs the high-frequency alternating current to the electromagnetic heating coil 8, thereby generating a high-frequency alternating magnetic field. In the high-frequency alternating magnetic field, the inner drum generates induced eddy currents due to electromagnetic induction, thereby heating the water in the inner drum 5.

[0117] As an implementation of this embodiment, a plurality of magnetic strips 12 are installed on the back of the electromagnetic heating coil 8 and the electromagnetic induction coil 18 of this embodiment to absorb magnetic flux lines and reduce leakage of magnetic flux lines.

[0118] As one implementation of this embodiment, the washing machine further includes a resonant circuit electrically connected to the electromagnetic heating driver 7 and a temperature detection circuit coupled to the resonant circuit. In this embodiment, the temperature detection circuit detects the current fed back to the electromagnetic heating driver 7 and uses this feedback to measure the water temperature within the inner drum 5.

[0119] This embodiment also provides a control method for a washing machine, the washing machine including an electromagnetic heating coil 8 and an electromagnetic heating driver 7 electrically connected to the electromagnetic heating coil 8, the control method comprising:

[0120] When the washing machine is heating the water in the inner drum, the inner drum is controlled to be in a position where the electromagnetic induction coil and the electromagnetic heating coil are opposite to each other, and the water temperature in the inner drum is measured by detecting, analyzing and calculating the current feedback of the electromagnetic heating driver.

[0121] When the heating / drying program of the washing machine of this embodiment is started, the current and voltage are converted into direct current by the electromagnetic heating driver 7, so that the direct current becomes high-frequency alternating current exceeding the audio frequency. The high-frequency alternating current with a frequency of 0-100 kHz is output to the electromagnetic heating coil 8, thereby generating a high-frequency alternating magnetic field. The electromagnetic induction lines act on the metal inner drum, and strong eddy currents are generated in the metal inner drum due to electromagnetic induction. When the eddy currents overcome the internal resistance of the inner drum and flow, the electrical energy is converted into thermal energy, thereby heating the inner drum and heating the water in the inner drum.

[0122] The washing machine of this embodiment heats the washing water by electromagnetic heating, and measures the washing water heating temperature by using an integrated resonant circuit.

[0123] During the heating process of the washing machine of this embodiment, the inner drum 5 can be positioned and locked by the positioning device so that the electromagnetic induction coil 18 fixed on the inner surface of the inner drum 5 is opposite to the electromagnetic heating coil 8 fixed on the outer drum.

[0124] During the electromagnetic heating process, the temperature of the electromagnetic heating coil 8 does not change much, but the electromagnetic induction coil 18 on the inner surface of the inner cylinder is consistent with the water temperature, which causes the temperature of the electromagnetic induction coil 18 to rise and the resistance to increase. Its resistance is a variable R1.

[0125] The electromagnetic induction coil 18 in turn influences the electromagnetic heating coil 8, forming an oscillating circuit. The electromagnetic heating coil 8 itself has a resistance R, and the electromagnetic induction coil 18 also forms a variable resistance R2 for the electromagnetic heating coil 8. This further influences the current of the electromagnetic heating driver 7. The current of the electromagnetic heating driver 7 is analyzed and calculated, and feedback is provided to measure the inner drum water temperature.

[0126] Furthermore, the main controller of the washing machine stores the set current intervals N1, N2, ..., Nn of the electromagnetic heating driver corresponding to the set water temperatures T1, T2, ..., Tn respectively. When the washing machine is heating the water in the inner drum, when the detection, analysis and calculation show that the current I of the electromagnetic heating driver is in the set current interval Nn, the water temperature in the inner drum of the washing machine is Tn.

[0127] The washing machine of this embodiment controls the inner drum to rotate during the process of heating the water in the inner drum. By continuously rotating the inner drum to even out the temperature, the temperature of the entire surface of the inner drum is uniform, and the water in the inner drum exchanges heat with the inner drum, thereby being evenly heated.

[0128] Therefore, in order to achieve temperature measurement during the heating process, the washing machine of this embodiment controls the inner drum to stop rotating every set time t0, and controls the positioning column of the positioning device to extend and cooperate with the positioning hole to lock the inner drum. The electromagnetic induction coil and the electromagnetic heating coil are in a relative position, and the water temperature in the inner drum is measured by detecting, analyzing and calculating the current feedback of the electromagnetic heating driver.

[0129] As an implementation of this embodiment, the washing machine controls and adjusts the heating power of the electromagnetic heating coil according to the process of heating the water in the inner drum.

[0130] The heating power of this embodiment can be adjusted to meet different working conditions:

[0131] Variable power electromagnetic heating is performed according to the load, set temperature, water level and other parameters: for example, high power heating can be performed under high water level and high load conditions; low power heating can be performed under low water level and small load conditions.

[0132] For example, the electromagnetic heating power is relatively high in the early stage, and when it is about to reach the set temperature, low-power heating is performed to achieve precise temperature heating.

[0133] For example, if the user sets the high temperature to 90℃ for washing, high-power heating can be used to shorten the time; if the user sets the low temperature to 30℃ for washing, low-power electromagnetic heating can be used.

[0134] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any technician familiar with this patent can make slight changes or modifications to equivalent embodiments using the above technical content without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the solution of the present invention.

Claims

1. A method for controlling a washing machine, comprising a housing; an inner drum disposed within the housing and having a washing chamber for independently holding washing water; and an electromagnetic heating device disposed within the housing for correspondingly heating the sidewalls of the inner drum; characterized in that: The control method includes: When the washing machine is performing the last rinse program and the spin program, the electromagnetic heating device is controlled to start heating the inner drum; The dehydration program of the washing machine includes an accelerated dehydration stage in which the speed of the inner drum gradually increases and a stable dehydration stage in which the speed of the inner drum remains unchanged. The washing machine controls the electromagnetic heating device to start heating the inner drum at least during the accelerated dehydration stage. The stable dehydration stage includes a low-speed stable dehydration stage and a high-speed stable dehydration stage. The washing machine controls the electromagnetic heating device to be turned on at a first set time interval T1 in the low-speed stable dehydration stage and to be turned on at a second set time interval T2 in the high-speed stable dehydration stage. The second set time interval T2 is greater than or equal to the first set time interval T1. The electromagnetic heating power of the electromagnetic heating device is adjustable, and the washing machine controls the heating power of the electromagnetic heating device in the accelerated dehydration stage to be greater than the heating power in the stable dehydration stage.

2. The control method of the washing machine according to claim 1, characterized in that: The washing machine controls the electromagnetic heating device to remain on throughout the accelerated spin stage and to be turned off when entering the stable spin stage.

3. The control method of the washing machine according to claim 1, characterized in that: The washing machine controls the electromagnetic heating device to be turned on at set time intervals during the stable dehydration stage.

4. The control method of a washing machine according to any one of claims 1 to 3, characterized in that: The washing machine controls the electromagnetic heating device to heat the inner drum with a first heating power P1 in the low-speed stable dehydration stage, heats the inner drum with a second heating power P2 in the accelerated dehydration stage, and heats the inner drum with a third heating power P3 in the high-speed stable dehydration stage, wherein the second heating power P2>the first heating power P1≥the third heating power P3.

5. The control method of the washing machine according to claim 1, characterized in that: The last rinsing program of the washing machine includes a rinsing water inlet stage, a rinsing washing stage and a rinsing drainage stage. The washing machine controls the electromagnetic heating device to be turned on at least in the rinsing drainage stage.

6. The control method of the washing machine according to claim 5, characterized in that: A drainage hole is provided on the side wall of the inner cylinder, and a centrifugal drainage mechanism for controlling the opening and closing of the drainage hole is installed on the drainage hole. The centrifugal drainage mechanism keeps the drainage hole in a normally closed state. When the rotation speed of the inner cylinder reaches V0, the centrifugal drainage mechanism opens the drainage hole due to the centrifugal force of the inner cylinder rotation; When the washing machine performs the last rinse program, the inner drum is controlled to rotate at a speed of V0, enters the rinsing and draining stage, and the electromagnetic heating device is controlled to turn on. When the inner drum continues to rotate at the speed of V0 for a set time T0, the electromagnetic heating device is controlled to turn off.

7. The control method of the washing machine according to claim 6, characterized in that: The electromagnetic heating power of the electromagnetic heating device is adjustable, and the washing machine controls the heating power of the electromagnetic heating device in the rinsing and draining stage to be greater than the heating power in other rinsing stages; The washing machine controls the electromagnetic heating device to heat the inner drum at a fourth heating power P4 during the rinsing water inlet stage and to heat the inner drum at a fifth heating power P5 during the rinsing water outlet stage, wherein the fourth heating power P4 ≤ the fifth heating power P5.

8. The control method of the washing machine according to claim 7, characterized in that: The electromagnetic heating power of the electromagnetic heating device is adjustable, and the main controller of the washing machine stores the corresponding relationship between the laundry load range of the washing machine and the electromagnetic heating power: When the washing machine detects that the laundry load is in a corresponding laundry load interval, the washing machine controls the electromagnetic heating device to perform heating at an electromagnetic heating power corresponding to the load interval.

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