Washing machine and control method thereof

Abstract

The present invention provides a washing machine and a control method thereof. The washing machine comprises: a housing; an inner drum disposed within the housing; and an electromagnetic heating coil disposed within the housing and positioned opposite the electromagnetic heating coil. The washing machine utilizes the principle of electromagnetic heating to measure the water temperature within the inner drum through electromagnetic induction changes between the electromagnetic heating coil and the electromagnetic induction coil. This reduces the number of temperature sensors, simplifies the washing machine's structure, and reduces its cost.

Description

Technical Field

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

[0002] Washing machines, one of the most widely used household appliances in daily life, have freed people from the hassles of laundry and brought great convenience. To improve the cleanliness of clothes washed and enhance the user's washing experience, more and more washing machines are equipped with heated wash functions. Washing machines with heated wash functions require monitoring and control of the wash water temperature to achieve the set heating temperature and meet the user's washing requirements. Therefore, existing washing machines generally include temperature sensors to detect the wash water temperature.

[0003] However, with the continuous innovation of washing machines, washing machines are adopting more and more heating methods. For example, the Chinese invention patent application with application number 201810343882.X, entitled "A Washing Machine," discloses a washing machine comprising a metal inner drum and an insulated outer drum, as well as a magnetic induction coil located outside the outer drum. When the magnetic induction coil is energized, the magnetic lines of flux generated by the magnetic induction coil can heat the inner drum. The present invention arranges a magnetic induction coil outside the outer drum. When the magnetic induction coil is energized, the magnetic lines of flux generated act on the inner drum, generating strong eddy currents in the inner drum due to electromagnetic induction. When the eddy currents overcome the internal resistance of the inner drum and flow, they convert electrical energy into thermal energy, achieving heating of the inner drum. Subsequently, the heated inner drum heats the washing water in the outer drum. Through the above-mentioned structure, the groove design of the existing outer drum is avoided, the space occupied by the outer drum is reduced, and the deposition of detergent in the groove can be avoided. In addition, the inner drum can be uniformly heated, reducing the safety hazards caused by condensation water generated inside the washing machine.

[0004] The above patent application discloses a heating method of washing water using electromagnetic heating, but does not provide a targeted water temperature detection design for this washing machine based on the electromagnetic heating method.

[0005] In addition, existing washing machines generally include an inner drum and an outer barrel, and multiple dehydration holes are distributed on the barrel wall of the inner drum. During the washing process, the washing water between the inner drum and the outer barrel will not be used, resulting in a waste of this part of the washing water. The dirt generated during the washing process will flow into the space between the inner drum and the outer barrel with the water and accumulate. With long-term use, the accumulation of dirt will affect the washing effect and reduce the user experience.

[0006] To address the above-mentioned issues, several patents have been proposed, such as Patent No. 201410215346.3, entitled "A Drum Washing Machine," a Chinese invention patent. 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 small diameter at the bottom and a large diameter at the mouth, the mouth of the inner drum being curved inward, a water inlet conduit disposed on the door seal, one end of the water inlet conduit connected to a rapid washing water heating device, the other end of the water inlet conduit extending through the door seal into the inner drum, and a drain port and a water pressure detection device disposed on the outer drum. 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.

[0007] The above invention provides a drum washing machine with a non-porous inner drum, which solves the problems of water waste between the inner drum and the outer drum and the accumulation of dirt between the inner drum and the outer drum. However, traditional washing machines heat the washing water by installing a heating pipe in the outer drum to improve the washing effect, while washing machines with a non-porous inner drum cannot install a heating pipe on the outer drum, and thus cannot achieve heated washing. In order to realize the heated washing function of the drum washing machine with a non-porous inner drum, an electromagnetic coil can be installed on the outer drum to heat the water in the inner drum by electromagnetic heating. However, for drum washing machines with a non-porous inner drum, since the washing water is stored in the inner drum and the inner drum needs to rotate for washing, a temperature sensor cannot be installed in the inner drum, and the water temperature in the non-porous inner drum cannot be detected, and the water heating process cannot be controlled.

[0008] In view of this, the present invention is proposed. Summary of the Invention

[0009] In order to solve the above problems, the first object of the present invention is to provide a washing machine that uses electromagnetic heating to heat wash water and designs a new temperature measurement method for electromagnetic heating. Specifically, the following technical solutions are adopted:

[0010] A washing machine, comprising:

[0011] case;

[0012] An inner cylinder is arranged in the shell;

[0013] An electromagnetic heating coil is disposed in the shell; and an electromagnetic induction coil is disposed on the inner cylinder and is located at a position opposite to the electromagnetic heating coil.

[0014] Furthermore, the washing machine also includes an outer drum arranged in the shell, the inner drum is arranged in the outer drum, the electromagnetic heating coil is arranged at the bottom of the circumferential side wall of the outer drum, and the electromagnetic induction coil is arranged on the inner wall surface of the circumferential side wall of the inner drum; during the rotation of the inner drum, the electromagnetic induction coil and the electromagnetic heating coil are in the same radial direction of the outer drum.

[0015] Furthermore, a positioning device is provided on the outer cylinder, the positioning device has a retractable positioning column, and the inner cylinder has a positioning hole for cooperating with the positioning column;

[0016] When the positioning post of the positioning device extends out and matches with the positioning hole to lock the inner cylinder, the electromagnetic induction coil and the electromagnetic heating coil are in relative positions.

[0017] Furthermore, the electromagnetic induction coil is encapsulated by an encapsulation structure of insulating material, and the encapsulation structure has a connection structure for connecting to the inner cylinder;

[0018] Preferably, the electromagnetic heating coil is arranged on the inner wall surface of the peripheral side wall of the outer cylinder, and the electromagnetic heating coil is encapsulated by an encapsulation structure of an insulating material, and the encapsulation structure has a connection structure for connecting to the outer cylinder.

[0019] Furthermore, the washing machine further comprises an electromagnetic heating driver electrically connected to the electromagnetic heating coil, wherein the electromagnetic heating driver rectifies the alternating current into direct current, and then converts the direct current into high-frequency alternating current;

[0020] The electromagnetic heating driver outputs high-frequency alternating current to the electromagnetic heating coil, thereby generating a high-frequency alternating magnetic field. The inner cylinder generates eddy currents due to electromagnetic induction in the high-frequency alternating magnetic field, thereby heating the water in the inner cylinder.

[0021] Furthermore, 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.

[0022] The second object of the present invention is to provide a method for controlling a washing machine, which specifically adopts the following technical solution:

[0023] The washing machine of the present invention includes an electromagnetic heating coil and an electromagnetic heating driver electrically connected to the electromagnetic heating coil. The control method of the washing machine includes:

[0024] 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.

[0025] Furthermore, the main driver 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.

[0026] Furthermore, when the washing machine is heating the water in the inner drum, the inner drum is controlled to rotate, and the inner drum is controlled to stop rotating after a set time t0. When the positioning column of the positioning device is controlled 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.

[0027] Furthermore, 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;

[0028] Preferably, the washing machine increases the excitation pulse frequency through the electromagnetic heating driver, and when the working circuit is in an unadjusted state, the heating power of the electromagnetic heating coil can be reduced;

[0029] 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;

[0030] 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.

[0031] The washing machine of the present invention uses electromagnetic heating coils to heat the metal wall of the inner drum. The inner drum heats the washing water in the drum, thereby realizing the washing machine's heating and washing function. The washing machine of the present invention uses electromagnetic heating coils for heating. An electromagnetic induction coil is provided on the inner drum. The alternating magnetic field generated by the electromagnetic induction coil during the heating process reacts to the electromagnetic heating coil. Since the electromagnetic induction coil is provided in the inner drum, as the water temperature increases, the eddy current in the electromagnetic induction coil changes after the temperature increases, and the alternating magnetic field reacting to the electromagnetic heating coil also changes. The electromagnetic induction coil affects the electromagnetic heating coil to form an oscillating circuit. The electromagnetic heating coil itself has a resistance R. The electromagnetic induction coil forms a variable resistance R2 for the electromagnetic heating coil. Furthermore, the current of the electromagnetic heating driver of the electromagnetic heating coil is affected. By analyzing and calculating the current of the electromagnetic heating driver, feedback is performed to measure the water temperature in the inner drum.

[0032] The washing machine of the present invention utilizes the electromagnetic heating principle and measures the water temperature in the inner drum through the mutual electromagnetic induction changes between the electromagnetic heating coil and the electromagnetic induction coil, thereby reducing the number of temperature sensors, simplifying the structure of the washing machine, and reducing the cost of the washing machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A front view of a washing machine according to an embodiment of the present invention;

[0034] Figure 2 The washing machine of the embodiment of the present invention Figure 1 Cross-sectional view of the middle XX plane.

[0035] 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

[0036] A washing machine and a control method thereof of the present invention are described in detail below with reference to the accompanying drawings:

[0037] like Figure 1-Figure 2 As shown, this embodiment provides a washing machine, comprising:

[0038] Shell 1;

[0039] An inner cylinder 5 is provided in the housing 1;

[0040] The electromagnetic heating coil 8 is arranged in the housing 1;

[0041] 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 .

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] Furthermore, the washing machine of this embodiment further includes an outer drum disposed within the housing, the inner drum disposed within the outer drum, the electromagnetic heating coil 8 disposed at the bottom of the circumferential sidewall of the outer drum 4, and the electromagnetic induction coil 18 disposed on the inner surface of the circumferential sidewall of the inner drum 5. During rotation of the inner drum, the electromagnetic induction coil 18 and the electromagnetic heating coil 8 are located in the same radial direction as the outer drum 4. Thus, during the heating process, the inner drum 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.

[0049] 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.

[0050] Since the inner drum of the washing machine in this embodiment can independently hold washing water, the outer drum can be eliminated. For washing machines without an outer drum, the electromagnetic heating coil 8 can be directly arranged in the shell 1 in this embodiment, and in a relative position to the electromagnetic induction coil 8.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] For example, during dehydration, the air pressure balancing mechanism can also ensure the air pressure balance in the inner drum.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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 .

[0071] 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:

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] 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.

[0082] The heating power of this embodiment can be adjusted to meet different working conditions:

[0083] 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.

[0084] 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.

[0085] 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.

[0086] There are multiple ways to adjust the power of electromagnetic heating in the washing machine of this embodiment, including:

[0087] The washing machine increases the excitation pulse frequency through the electromagnetic heating driver. When the working circuit is in an unregulated state, the heating power of the electromagnetic heating coil can be reduced.

[0088] 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;

[0089] 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.

[0090] As one implementation of this embodiment, the control method of the washing machine includes controlling the 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 improving the user experience.

[0091] 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.

[0092] 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.

[0093] 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.

[0094] 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.

[0095] 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.

[0096] 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.

[0097] 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.

[0098] 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.

[0099] 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.

[0100] 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.

[0101] 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.

[0102] 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.

[0103] 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.

[0104] 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:

[0105] 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.

[0106] 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 washing machine, characterized in that: include: case; An inner cylinder is arranged in the shell; An electromagnetic heating coil is disposed in the housing; and an electromagnetic induction coil, disposed on the inner cylinder and located at a position opposite to the electromagnetic heating coil; Also included is an electromagnetic heating driver electrically connected to the electromagnetic heating coil, the electromagnetic heating driver rectifies the alternating current into direct current, and then converts the direct current into high-frequency alternating current; The electromagnetic heating driver outputs high-frequency alternating current to the electromagnetic heating coil, thereby generating a high-frequency alternating magnetic field. In the high-frequency alternating magnetic field, the inner cylinder generates eddy currents due to electromagnetic induction, heating the water in the inner cylinder. It also includes a resonant circuit electrically connected to the electromagnetic heating driver and a temperature detection circuit coupled to the resonant circuit. The water temperature in the inner drum is measured by detecting, analyzing and calculating the current feedback of the electromagnetic heating driver.

2. The washing machine according to claim 1, wherein It also includes an outer cylinder arranged in the shell, the inner cylinder is arranged in the outer cylinder, the electromagnetic heating coil is arranged at the bottom of the circumferential side wall of the outer cylinder, and the electromagnetic induction coil is arranged on the inner wall surface of the circumferential side wall of the inner cylinder; when the inner cylinder rotates, the electromagnetic induction coil and the electromagnetic heating coil are in the same radial direction of the outer cylinder.

3. The washing machine according to claim 2, characterized in that The outer cylinder is provided with a positioning device, the positioning device has a retractable positioning column, and the inner cylinder has a positioning hole for cooperating with the positioning column; When the positioning post of the positioning device extends out and matches with the positioning hole to lock the inner cylinder, the electromagnetic induction coil and the electromagnetic heating coil are in relative positions.

4. The washing machine according to claim 3, characterized in that The electromagnetic induction coil is encapsulated by an encapsulation structure made of insulating material, and the encapsulation structure has a connection structure for connecting with the inner cylinder.

5. The washing machine according to claim 4, characterized in that The electromagnetic heating coil is arranged on the inner wall surface of the peripheral side wall of the outer cylinder. The electromagnetic heating coil is encapsulated by an encapsulation structure of an insulating material. The encapsulation structure has a connection structure for connecting with the outer cylinder.

6. The control method of a washing machine according to any one of claims 3 to 5, characterized in that: The washing machine includes an electromagnetic heating coil and an electromagnetic heating driver electrically connected to the electromagnetic heating coil, and the control method includes: 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.

7. The control method of the washing machine according to claim 6, characterized in that: The main driver 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. 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.

8. The control method of the washing machine according to claim 6 or 7, characterized in that: When the washing machine is heating the water in the inner drum, the inner drum is controlled to rotate, and every set time t0, the inner drum is controlled to stop rotating. When the positioning column of the positioning device is controlled 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.

9. The control method of the washing machine according to claim 6, characterized in that: 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.

10. The control method of the washing machine according to claim 9, characterized in that: 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. 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; 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.

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