CN114164612A - Washing machine and control method thereof - Google Patents

Abstract

The present invention provides a washing machine and a control method thereof, the washing machine includes: a housing; the inner cylinder is arranged in the shell; and an electromagnetic heating coil disposed in the housing at a position that can be opposed to the electromagnetic heating coil. The washing machine of the invention utilizes the electromagnetic heating principle, measures the water temperature in the inner barrel through the mutual electromagnetic induction change between the electromagnetic heating coil and the electromagnetic induction coil, reduces the arrangement of a temperature sensor, simplifies the structure of the washing machine and reduces the cost of the washing machine.

Description

Washing machine and control method thereof

Technical Field

The invention relates to the technical field of laundry equipment, in particular to a washing machine and a control method thereof.

Background

The washing machine is used as a household appliance which is widely used in daily life of people, helps people get rid of the trouble of washing clothes, and brings great convenience to people. In order to improve the cleanliness of the washing machine for washing clothes and improve the washing experience of users, more and more washing machines have a heating washing function. For a washing machine with a heating and washing function, the heating temperature of washing water needs to be monitored and controlled to reach a set heating temperature, so that the washing requirements of users are met. Therefore, the conventional washing machine generally includes a temperature sensor for detecting the temperature of the washing water.

However, as the washing machine is continuously innovated, the washing machine adopts more and more heating methods. For example, the application number is 201810343882.X, the invention name is Chinese invention patent application of a washing machine, and discloses the washing machine which comprises an inner cylinder made of a metal material, an insulated outer cylinder and a magnetic induction coil positioned outside the outer cylinder, wherein the magnetic induction coil can heat the inner cylinder by magnetic induction lines generated when the magnetic induction coil is electrified. According to the invention, the magnetic induction coil is arranged on the outer side of the outer barrel, when the magnetic induction coil is electrified, the generated magnetic induction line acts on the inner barrel, strong eddy current is generated in the inner barrel due to electromagnetic induction, the eddy current overcomes the internal resistance of the inner barrel and completes the conversion of electric energy to heat energy when flowing, the heating of the inner barrel is realized, and then the washing water in the outer barrel is heated by the heated inner barrel. Through the structure, the groove design of the existing outer barrel is avoided, the space occupation of the outer barrel is reduced, and the deposition of the detergent in the groove can be avoided. And can realize the even heating to the inner tube, reduce the potential safety hazard that the inside comdenstion water that produces of washing machine leads to.

The above patent application discloses a heating method of electromagnetically heating washing water, but a design of detecting water temperature in a targeted manner according to the electromagnetic heating method is not provided for such a washing machine.

In addition, current washing machine generally all includes inner tube and outer bucket, distributes a plurality of dehydration holes on the bucket wall of inner tube, and in the washing process, the washing water between inner tube and the outer bucket can not utilized, causes the waste of this part washing water, and the filth that produces in the washing process can be followed rivers and get into between inner tube and the outer bucket and be accumulated, along with long-time use, the accumulation of filth can influence the washing effect, reduces user's use and experiences.

In order to solve the above problems, some patents are also proposed, such as patent No. 201410215346.3, entitled chinese invention patent of a drum washing machine, and the invention relates to a drum washing machine, which comprises a box body, an inner cylinder and an outer cylinder are arranged in the box body, a door seal is arranged between the outer cylinder and the box body, the inner cylinder is connected with a driving device, the inner cylinder is a non-porous inner cylinder, the inner cylinder is a conical cylinder with a small diameter at the cylinder bottom and a large diameter at the cylinder opening, the cylinder opening of the inner cylinder is inwards folded in an arc shape, a water inlet conduit is arranged on the door seal, one end of the water inlet conduit is connected with a washing water rapid heating device, the other end of the water inlet conduit penetrates through the door seal and extends into the inner cylinder, and a water outlet and a water pressure detection device are arranged on the outer cylinder. According to the technical scheme, the inner cylinder is a non-porous inner cylinder, water is fed into the inner cylinder through the water inlet guide pipe arranged on the door seal, and water is drained in the dehydration process through the shape of the inner cylinder, so that water can be prevented from being stored between the inner cylinder and the outer cylinder, and the water consumption for washing is greatly saved.

The invention provides a drum washing machine with a non-porous inner drum, which solves the problems of water storage waste between the inner drum and the outer drum and dirt accumulation between the inner drum and the outer drum. However, the conventional washing machine realizes the washing effect of heating washing water by arranging the heating pipe in the outer barrel, and the washing machine without the hole inner barrel cannot arrange the heating pipe on the outer barrel any more, so that the heating washing cannot be realized any more. In order to realize the heating and washing functions of the drum washing machine with the non-porous inner drum, the electromagnetic coil can be arranged on the outer drum, and water in the inner drum is heated in an electromagnetic heating mode. However, for the drum washing machine with the non-porous inner drum, because the washing water is stored in the inner drum and the inner drum needs to rotate for washing, a temperature sensor cannot be arranged in the inner drum, the water temperature detection in the non-porous inner drum cannot be realized, and the water heating process cannot be controlled.

In view of the above, the present invention is particularly proposed.

Disclosure of Invention

In order to solve the above problems, a first aspect of the present invention is to provide a washing machine that heats washing water by electromagnetic heating and designs a brand new temperature measurement method for electromagnetic heating, and specifically, the following technical solutions are adopted:

a washing machine comprising:

a housing;

the inner cylinder is arranged in the shell;

an electromagnetic heating coil disposed within the housing; and an electromagnetic induction coil disposed on the inner cylinder and located at a position that can be opposed to the electromagnetic heating coil.

Furthermore, the washing machine also comprises 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 peripheral side wall of the outer cylinder, and the electromagnetic induction coil is arranged on the inner wall surface of the peripheral side wall of the inner cylinder; in the process of rotating the inner cylinder, the electromagnetic induction coil and the electromagnetic heating coil are positioned in the same radial direction of the outer cylinder.

Furthermore, a positioning device is arranged on the outer cylinder, the positioning device is provided with a telescopic positioning column, and a positioning hole matched with the positioning column is formed in the inner cylinder;

when a positioning column of the positioning device extends out to be matched with the positioning hole to lock the inner cylinder, the electromagnetic induction coil and the electromagnetic heating coil are in opposite positions.

Furthermore, the electromagnetic induction coil is encapsulated by an encapsulation structure made of insulating materials, and the encapsulation structure is provided with a connecting structure used for being connected with the inner cylinder;

preferably, the electromagnetic heating coil is disposed on an inner wall surface of a peripheral side wall of the outer cylinder, the electromagnetic heating coil is encapsulated by an encapsulating structure made of an insulating material, and the encapsulating structure has a connecting structure for connecting with the outer cylinder.

Furthermore, the washing machine also comprises an electromagnetic heating driver electrically connected with the electromagnetic heating coil, wherein the electromagnetic heating driver rectifies alternating current into direct current and converts the direct current into high-frequency alternating current;

the electromagnetic heating driver outputs high-frequency alternating current to the electromagnetic heating coil, so that a high-frequency alternating magnetic field is generated, the inner cylinder generates heat due to induction eddy current generated by electromagnetic induction in the high-frequency alternating magnetic field, and water in the inner cylinder is heated.

Further, 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.

The second invention of the present invention is to provide a control method of a washing machine, specifically, the following technical solutions are adopted:

the washing machine of the present invention includes an electromagnetic heating coil and an electromagnetic heating driver electrically connected to the electromagnetic heating coil, and a control method of the washing machine includes:

in the process of heating water in the inner barrel of the washing machine, the inner barrel is controlled to be positioned at the position where the electromagnetic induction coil is opposite to the electromagnetic heating coil, and the water temperature in the inner barrel is measured through detecting, analyzing and calculating the current feedback of the electromagnetic heating driver.

Furthermore, the set current intervals N1, N2, and the set current intervals Nn of the electromagnetic heating driver corresponding to the set water temperatures T1, T2, and the set water temperatures T.

Further, the washing machine controls the inner barrel to rotate in the process of heating water in the inner barrel, the inner barrel is controlled to stop rotating every set time t0, when the positioning column of the positioning device is controlled to extend out to be matched with the positioning hole to lock the inner barrel, the electromagnetic induction coil and the electromagnetic heating coil are in relative positions, and the water temperature in the inner barrel is measured through current feedback of the electromagnetic heating driver through detection, analysis and calculation.

Further, 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 barrel;

preferably, the washing machine improves the excitation pulse frequency through the electromagnetic heating driver, and the heating power of the electromagnetic heating coil can be reduced when the working circuit is in an offset state;

or the washing machine applies excitation pulse through the gap of the electromagnetic heating driver, so that the electromagnetic heating coil intermittently heats the inner cylinder, and the interval time of the intermittently heated inner cylinder is controlled to adjust the electromagnetic heating power of the washing machine;

or the electromagnetic heating driver is a controllable rectifying module, and the heating power of the electromagnetic heating coil is changed by changing the direct-current output voltage rectified by the controllable rectifying module through controlling the voltage.

The washing machine of the invention adopts an electromagnetic heating mode to heat the metal cylinder wall of the inner cylinder through the electromagnetic heating coil, and the inner cylinder heats the washing water in the cylinder, thereby realizing the heating and washing functions of the washing machine. The washing machine is characterized in that the inner barrel is provided with the electromagnetic induction coil, an alternating magnetic field generated by the electromagnetic induction coil in the heating process reacts on the electromagnetic heating coil, and as the temperature of the electromagnetic induction coil arranged in the inner barrel rises along with the rise of the water temperature, the eddy current in the electromagnetic induction coil after the temperature rises changes, and the alternating magnetic field reacting on the electromagnetic heating coil also changes. The electromagnetic induction coil influences the electromagnetic heating coil to jointly form an oscillating circuit, the electromagnetic heating coil is provided with a resistor R, and the electromagnetic induction coil forms a variable resistor R2 for the electromagnetic heating coil; furthermore, the current of an electromagnetic heating driver of the electromagnetic heating coil is influenced, and the water temperature in the inner cylinder is measured by feedback through the current analysis and calculation of the electromagnetic heating driver.

The washing machine of the invention utilizes the electromagnetic heating principle, measures the water temperature in the inner barrel through the mutual electromagnetic induction change between the electromagnetic heating coil and the electromagnetic induction coil, reduces the arrangement of a temperature sensor, simplifies the structure of the washing machine and reduces the cost of the washing machine.

Drawings

FIG. 1 is a front view of a washing machine according to an embodiment of the present invention;

fig. 2 is a sectional view of a washing machine according to an embodiment of the present invention taken along the X-X plane of fig. 1.

Reference numbers in the drawings illustrate: 1-shell 2-machine door 3-main controller 4-outer cylinder 5-inner cylinder 6-lifting rib 7-electromagnetic heating driver 8-electromagnetic heating coil 9-footing 10-packaging structure 11-drain pipe 12-magnetic strip 13-drainage device 14-inner cylinder door 15-sealed cabin structure 16-detergent putting box 17-upper deck plate 18-electromagnetic induction coil.

Detailed Description

A washing machine and a control method thereof of the present invention will be described in detail with reference to the accompanying drawings:

as shown in fig. 1 to 2, the present embodiment provides a washing machine including:

a housing 1;

an inner cylinder 5 disposed in the housing 1;

an electromagnetic heating coil 8 provided in the housing 1;

and an electromagnetic induction coil 18 provided on the inner cylinder 5 at a position that can be opposed to the electromagnetic heating coil 8.

The washing machine of the embodiment adopts an electromagnetic heating mode to heat the metal cylinder wall of the inner cylinder 5 through the electromagnetic heating coil 8, and the inner cylinder 5 heats the washing water in the cylinder, so that the heating and washing functions of the washing machine are realized. In the washing machine of the embodiment, the electromagnetic induction coil 18 is arranged on the inner cylinder aiming at the mode of heating by the electromagnetic heating coil 8, the alternating magnetic field generated by the electromagnetic induction coil 18 in the heating process counteracts the electromagnetic heating coil 8, and as the electromagnetic induction coil 18 is arranged in the inner cylinder 5 and the temperature rises along with the rise of the water temperature, the eddy current in the electromagnetic induction coil 18 after the temperature rises changes, and the alternating magnetic field counteracting the electromagnetic heating coil 8 also changes. The electromagnetic induction coil 18 influences the electromagnetic heating coil 8 to jointly form an oscillating circuit, the electromagnetic heating coil 8 has a resistance R, and the electromagnetic induction coil 18 forms a variable resistance R2 for the electromagnetic heating coil 8; further, the temperature of the water in the inner tube 5 is measured by feedback by analyzing and calculating the current of the electromagnetic heating driver of the electromagnetic heating coil 8, which has an influence on the current of the electromagnetic heating driver.

Therefore, the washing machine of the embodiment utilizes the electromagnetic heating principle, and the water temperature in the inner barrel 5 is measured through the mutual electromagnetic induction change between the electromagnetic heating coil 8 and the electromagnetic induction coil 18, so that the arrangement of temperature sensors is reduced, the structure of the washing machine is simplified, and the cost of the washing machine is reduced.

Preferably, the washing machine of the embodiment is a drum washing machine with a nonporous inner drum front opening structure, has a simple structure, and can greatly reduce the washing water consumption of the washing machine without filling washing/rinsing water between the inner drum and the outer drum. The possibility of dirt adhesion between the inner cylinder and the outer cylinder is avoided. The user health and user experience are greatly improved, and water resources are greatly saved.

This embodiment washing machine adopts the sclausura inner tube, the inner tube independently holds the washing water during washing, the washing water heating of sclausura inner tube washing machine can't be realized to traditional washing machine's resistance wire heating mode, again because the inner tube needs to rotate at the laundry in-process, also can't set up heating device in the inner tube and heat the water in the inner tube, consequently, the washing machine of the sclausura inner tube of this embodiment passes through the lateral wall of electromagnetic heating coil 8 heating inner tube 5, the lateral wall of inner tube 5 is heated by electromagnetic heating coil 8 and then gives the washing water in the inner tube 5 with the heat transfer, realize the heating of washing water.

In addition, because the resistance wire heating mode that current washing machine adopted, the resistance wire submergence directly heats in water, because the quality of water environment is comparatively complicated, along with the increase of time, deposit incrustation scale on the resistance wire, and because the reason of mounted position is difficult for cleaning to cause heating efficiency to reduce gradually, damage even. In the embodiment, the electromagnetic heating device is adopted to realize non-contact heating, so that the problems can be avoided, the service life is greatly prolonged, and long-term high-efficiency heating can be kept.

In order to realize electromagnetic heating, the inner cylinder of the embodiment is made of ferrous materials and can cut alternating magnetic lines generated by the electromagnetic heating coil 8 to generate alternating current (namely eddy current), the eddy current enables carriers on the side wall of the inner cylinder to move randomly at a high speed, and the carriers collide and rub with each other to generate heat energy so as to heat water in the inner cylinder.

Furthermore, the washing machine of the present embodiment further includes an outer cylinder disposed in the housing, the inner cylinder being disposed in the outer cylinder, the electromagnetic heating coil 8 being disposed at the bottom of the peripheral sidewall of the outer cylinder 4, and the electromagnetic induction coil 18 being disposed on the inner wall surface of the peripheral sidewall of the inner cylinder 5; in the process of the rotation of the inner cylinder, the electromagnetic induction coil 18 and the electromagnetic heating coil 8 are positioned in the same radial direction of the outer cylinder 4. Thus, during the heating process, the inner barrel 5 needs to be controlled to rotate until the electromagnetic induction coil 18 and the electromagnetic heating coil 8 are opposite to each other to realize temperature measurement.

In order to position the electromagnetic induction coil 18 and the electromagnetic heating coil 8 opposite to each other to realize temperature measurement, a positioning device is arranged on the outer cylinder 4 in the embodiment, the positioning device is provided with a telescopic positioning column, and the inner cylinder 5 is provided with a positioning hole matched with the positioning column; when the positioning column of the positioning device extends out to match with the positioning hole to lock the inner cylinder, the electromagnetic induction coil 18 and the electromagnetic heating coil 8 are in opposite positions.

Since the inner tub of the washing machine of the present embodiment can independently contain the washing water, the washing machine of the present embodiment can also eliminate the outer tub, and for the washing machine without the outer tub, the present embodiment can directly arrange the electromagnetic heating coil 8 in the housing 1, and the electromagnetic heating coil 8 is located at a position opposite to the position.

As an implementation manner of this embodiment, the electromagnetic induction coil 18 of this embodiment is encapsulated by the encapsulation structure 10 made of an insulating material, and the encapsulation structure 10 has a connection structure for connecting with an inner cylinder. Further, the electromagnetic heating coil 8 is provided on an inner wall surface of the peripheral side wall of the outer cylinder 4, the electromagnetic heating coil 8 is sealed by a sealing structure 10 made of an insulating material, and the sealing structure 10 has a connecting structure for connecting with the outer cylinder.

In this embodiment, the electromagnetic heating coil 8 and the electromagnetic induction coil 18 are high-frequency resonance coils, and the coils are wound by concentric circles of copper wires. The electromagnetic induction coil 18 and the electromagnetic heating coil 8 are packaged by the packaging structure 10, so that the contact between water and the electromagnetic induction coil 18 is avoided, and the reliability and the safety are improved.

The washing machine of the embodiment further comprises an electromagnetic heating driver 7 electrically connected with the electromagnetic heating coil 8, wherein the electromagnetic heating driver 7 rectifies alternating current into direct current and then converts the direct current into high-frequency alternating current; the electromagnetic heating driver 7 outputs a high-frequency alternating current to the electromagnetic heating coil 8, thereby generating a high-frequency alternating magnetic field in which the inner tube generates heat due to an induced eddy current generated by electromagnetic induction, and heats the water in the inner tube 5.

In one embodiment of the present embodiment, a plurality of magnetic strips 12 are attached to the back surfaces of the electromagnetic heating coil 8 and the electromagnetic induction coil 18 in the present embodiment, and absorb magnetic induction lines to reduce leakage of the magnetic induction lines.

As an implementation manner of this embodiment, the washing machine of this embodiment further includes a resonant circuit electrically connected to the electromagnetic heating driver 7, and a temperature detection circuit coupled to the resonant circuit. In the present embodiment, the temperature detection circuit detects the current fed back to the electromagnetic heating actuator 7, and the temperature of the water in the inner tube 5 is measured by feedback.

The drum washing machine of the present embodiment has a cabinet 1, and the cabinet 1 includes: a top deck 17, a front panel, a back panel and a bottom panel. The bottom plate is provided with feet 9 for supporting the whole washing machine. The casing 1 has an outer cylinder 4 therein, and an inner cylinder 5 is coaxially disposed in the outer cylinder 4. The outer cylinder 4 is mainly used for collecting the drainage of the inner cylinder 5 and the drainage of the inner cylinder 5 by high-speed centrifugal dehydration. The inner drum 5 rotates, preferably with lifting ribs 6, and is continuously lifted and dropped to beat the laundry, so as to wash the laundry. The inner cylinder 5 is of a non-porous structure, and the outer cylinder 4 is provided with a central mounting hole for mounting and fixing a bearing. An inner cylinder shaft, which is fixedly connected with the inner cylinder 5, passes through the bearing and is connected with a driving motor. An openable/closable inner cylinder door 14 is installed on a front cylinder opening of the inner cylinder 5, thereby realizing that the inner cylinder 5 is a sealed cabin structure 15.

In order to realize water inlet into the nonporous inner barrel, the driving motor of the drum washing machine of the embodiment is in transmission connection with the inner barrel 5 through an inner barrel shaft to drive the inner barrel 5 to rotate, a hollow channel communicated with the inner part of the inner barrel 5 is arranged in the inner barrel shaft, and a water inlet pipeline of the washing machine is communicated with the hollow channel of the inner barrel shaft.

The inner cylinder 5 of this embodiment is provided with an air pressure balancing mechanism for communicating the inner cylinder 5 with the external environment to balance the air pressure inside the inner cylinder.

When water enters, the air in the sealed cabin of the inner cylinder is pressurized and can overflow through the balancing mechanism, so that the air pressure balance is ensured.

When water is cut off suddenly, external atmosphere can enter the sealed cabin of the inner barrel rapidly, suck back is damaged, air pressure balance is guaranteed, and washing water is prevented from being sucked into a tap water pipe network.

Other air pressure balancing mechanisms can also ensure the air pressure balance of the inner cylinder during dehydration.

As an implementation manner of this embodiment, the air pressure balancing mechanism includes a pressure equalizing hole provided on the inner barrel 5, and one end of the pressure equalizing hole, which is communicated with the inside of the inner barrel 5, is provided at a position on the inner barrel 5 close to the central rotation axis and is always higher than the highest water level position in the inner barrel 5.

Specifically, the pressure equalizing pore passage is formed in the inner cylinder shaft and is communicated with the inside of the inner cylinder 5 and the external environment, and the highest water level in the inner cylinder 5 is lower than the inner cylinder shaft. Thus, the water in the inner cylinder 5 can be prevented from flowing out of the pressure equalizing hole.

In this embodiment, the pressure equalizing channel includes a first channel section and a second channel section, the first channel section is disposed in parallel with the hollow channel, one end of the first channel section is communicated with the inside of the inner cylinder, one end of the second channel section is communicated with the first channel section, and the other end of the second channel section extends to the outer peripheral wall of the inner cylinder shaft and is communicated with the inside of the outer cylinder. Preferably, the second pore channel section and the first pore channel section are vertically arranged to form an L-shaped pressure equalizing pore channel.

The embodiment provides an open drum type washing machine before inner tube, sets up inner tube door 14 on the inner tube 5, realizes the washing of inner tube 5 enclosure space, and the possibility of avoiding the clothing of inner tube 5 to come out to and the clothing pressurized and beat lead to flowing out or splash out by the inner tube, avoided between the interior, the urceolus dirt adnexed possibility, really realized that the section of thick bamboo of cylinder is anhydrous.

The washing machine of this embodiment has the lock detection device that the inner tube lock was locked to target in place, ensures that the inner tube lock is locked to target in place, ensures that the locking judges rate of accuracy 100%, because cylinder dehydration rotational speed can reach 1600 revolutions per minute, if the inner tube door on the inner tube fails to lock well, will take place the incident, very big improvement the security of machine, user health and user experience.

In order to realize the drainage of the imperforate inner cylinder, a drainage hole is formed in the side wall of the inner cylinder in the embodiment, a centrifugal drainage mechanism is installed on the drainage hole, the centrifugal drainage mechanism keeps the drainage hole in a normally closed state to form the imperforate inner cylinder and independently contain washing water, when drainage is needed, the inner cylinder is controlled to rotate at a high speed, the centrifugal mechanism descends the drainage hole to be opened under the centrifugal action of the high-speed rotation, and the washing water is drained from the drainage hole. Preferably, said centrifugal draining means are arranged in the internal chamber of the lifting rib 6.

The front panel of the casing of the embodiment has a clothes input opening and a door 2 installed on the clothes input opening to control the opening and closing of the clothes input opening.

The main controller 3 of the washing machine is arranged on the upper part of the front plate of the shell of the embodiment, and a detergent putting box 16 is arranged in the shell 1 and positioned above the outer cylinder 4 for putting detergent.

The bottom of the outer tub 4 of the present embodiment is connected to a drain 13, and the drain 13 is connected to a drain pipe 11 for leading water out of the housing 1.

The present embodiment also provides a control method of 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 including:

in the process of heating water in the inner barrel of the washing machine, the inner barrel is controlled to be positioned at the position where the electromagnetic induction coil is opposite to the electromagnetic heating coil, and the water temperature in the inner barrel is measured through detecting, analyzing and calculating the current feedback of the electromagnetic heating driver.

The heating/drying program of the washing machine of this embodiment is started, the current voltage is converted into direct current through the electromagnetic heating driver 7, so that the direct current becomes high-frequency alternating current exceeding the audio frequency, and the high-frequency alternating current with the frequency of 0-100KHz is output to the electromagnetic heating coil 8, thereby generating a high-frequency alternating magnetic field; the electromagnetic induction wire acts on the inner cylinder made of metal, strong eddy current is generated in the metal inner cylinder due to electromagnetic induction, and the eddy current overcomes the internal resistance of the inner cylinder and completes the conversion of electric energy to heat energy when flowing, so that the inner cylinder generates heat and heats water in the inner cylinder.

The washing machine of the present embodiment heats the washing water in an electromagnetic heating manner, and measures the heating temperature of the washing water by using an integrated resonance circuit.

In the heating process of the washing machine of the embodiment, the inner barrel 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 barrel 5 is opposite to the electromagnetic heating coil 8 fixed on the outer barrel.

In the electromagnetic heating process, the temperature of the electromagnetic heating coil 8 basically does not change greatly, but the electromagnetic induction coil 18 on the inner surface of the inner barrel is consistent with the water temperature, so that the temperature of the electromagnetic induction coil 18 is increased, the resistance is increased, and the resistance is a variable R1.

The electromagnetic induction coil 18, in turn, affects the electromagnetic heating coil 8 to form an oscillating circuit, the electromagnetic heating coil 8 itself having a resistance R, the electromagnetic induction coil 18 also forming a varying resistance R2 to the electromagnetic heating coil 8. Further, the current of the electromagnetic heating driver 7 is affected. And analyzing and calculating the current of the electromagnetic heating driver 7, and feeding back to measure the water temperature in the inner cylinder.

Furthermore, the set water temperatures T1, T2, and the set current intervals N1, N2, and the set current intervals N of the electromagnetic heating driver corresponding to the set water temperatures t.a.and Tn are stored in the main controller of the washing machine, and when the current I of the electromagnetic heating driver is detected, analyzed and calculated to be in the set current interval Nn in the process of heating the water in the inner drum of the washing machine, the water temperature in the inner drum of the washing machine is Tn.

The washing machine of the embodiment controls the inner barrel to rotate in the process of heating the water in the inner barrel. The temperature of the whole surface of the inner cylinder is uniform by continuously rotating the inner cylinder to realize the heat exchange between the water in the inner cylinder and further uniform heating.

Therefore, in order to realize temperature measurement in the heating process, the washing machine of the embodiment controls the inner cylinder to stop rotating every set time t0, controls the positioning column of the positioning device to extend out to be matched with the positioning hole to lock the inner cylinder, controls the electromagnetic induction coil and the electromagnetic heating coil to be in relative positions, and measures the water temperature in the inner cylinder through current feedback of the electromagnetic heating driver through detection, analysis and calculation.

As an implementation manner of the present embodiment, the washing machine adjusts the heating power of the electromagnetic heating coil according to the process control of heating the water in the inner tub.

The heating power of this embodiment is adjustable in order to satisfy different operating modes:

according to the load, the power-variable electromagnetic heating is carried out by setting parameters such as temperature, water level and the like: high-power heating can be realized under the conditions of high water level and multiple loads; and low-power heating can be realized under the condition of low water level and small load.

If the electromagnetic heating power is large in the early stage, when the temperature reaches the set temperature immediately, low-power heating is carried out, and accurate temperature heating is achieved.

If the user sets high temperature of 90 ℃ for boiling and washing, high-power heating can be used, and the time is shortened; the user sets the low-temperature heating washing at 30 ℃, and low-power electromagnetic heating can be adopted.

The method for adjusting the electromagnetic heating power of the washing machine in the embodiment is various, and specifically comprises the following steps:

the washing machine improves the excitation pulse frequency through the electromagnetic heating driver, and the heating power of the electromagnetic heating coil can be reduced when the working circuit is in an imbalance state;

or the washing machine applies excitation pulse through the gap of the electromagnetic heating driver, so that the electromagnetic heating coil intermittently heats the inner cylinder, and the interval time of the intermittently heated inner cylinder is controlled to adjust the electromagnetic heating power of the washing machine;

or the electromagnetic heating driver is a controllable rectifying module, and the heating power of the electromagnetic heating coil is changed by changing the direct-current output voltage rectified by the controllable rectifying module through controlling the voltage.

As an implementation manner of the present embodiment, the control method of the washing machine of the present embodiment includes: when the washing machine executes the last rinsing program and/or the dewatering program, the electromagnetic heating device is controlled to start the heating inner barrel. This embodiment has realized the thermal dehydration of clothing, and electromagnetic heating device heating inner tube, clothing have lower moisture content, are convenient for dry fast/sun-dry/dry, promote user's use and experience.

Further, the dewatering program of the washing machine of the embodiment includes an accelerated dewatering stage in which the rotation speed of the inner drum is gradually increased and a stable dewatering stage in which the rotation speed of the inner drum is kept unchanged, and the washing machine controls the electromagnetic heating device to start to heat the inner drum at least in the accelerated dewatering stage.

When the washing machine of the embodiment executes the dehydration program, the inner cylinder rotates centrifugally at a high speed, so that a centrifugal thin water layer is formed on the wall of the inner cylinder, and at the moment, the electromagnetic heating device is controlled to start the heating inner cylinder, so that the high-temperature inner cylinder is heated to about 100 ℃, the wet clothes are heated and dried, and the water content is reduced.

The control method of the washing machine of the embodiment controls the electromagnetic heating device to start the heating inner cylinder at the acceleration dehydration stage of the dehydration program, for example, the electromagnetic heating is stably stopped at 600 revolutions, and the electromagnetic heating is carried out in the process of starting to rise to 800 revolutions; stopping electromagnetic heating when the rotation speed is 800 revolutions stably, and performing electromagnetic heating when the rotation speed is increased to 1000 revolutions; stopping electromagnetic heating stably at 1000 revolutions, and performing electromagnetic heating in the process of starting to rise to 1200 revolutions; and stopping electromagnetic heating stably at 1200 revolutions and performing electromagnetic heating in the process of starting to rise to 1400 revolutions. Under the stable state of the rotating speed, the centrifugal thin water layer is few, and the damage to clothes caused by too high heating temperature of the inner cylinder by the electromagnetic module is avoided

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

As another implementation manner of this embodiment, the washing machine controls the electromagnetic heating device to be turned on at intervals at set time intervals in the stable dehydration stage. Because the 'centrifugal thin water layer' in the stable dehydration stage is few, the energy loss can be avoided and the moisture content of the clothes can be reduced to a certain extent by adopting an interval heating mode.

Specifically, the stable dehydration stage comprises a low-speed stable dehydration stage and a high-speed stable dehydration stage, the electromagnetic heating device controlled by the washing machine is switched on at intervals of a first set time interval T1 in the low-speed stable dehydration stage and at intervals of a second set time interval T2 in the high-speed stable dehydration stage, and the second set time interval T2 is greater than or equal to the first set time interval T1.

As an implementation manner 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.

Preferably, the electromagnetic heating device controlled by the washing machine heats the inner cylinder at a first heating power P1 in a low-speed stable dehydration stage, heats the inner cylinder at a second heating power P2 in an accelerated dehydration stage, and heats the inner cylinder at a third heating power P3 in a high-speed stable dehydration stage, wherein the second heating power P2 is more than the first heating power P1 and is more than or equal to the third heating power P3.

As an implementation manner of this embodiment, the last rinsing program of the washing machine of this embodiment includes a rinsing water inlet stage, a rinsing washing stage, and a rinsing water discharge stage, and the washing machine controls the electromagnetic heating device to be turned on at least in the rinsing water discharge stage. This embodiment opens through controlling electromagnetic heating device at rinsing in-process, heats the inner tube, gets into the dehydration procedure behind the heating clothing, realizes "hot-taking off" effect, promotes the dehydration effect, further reduces the clothing moisture content.

Furthermore, a drain hole is arranged on the side wall of the inner cylinder, a centrifugal drainage mechanism for controlling the opening and closing of the drain hole is installed on the drain hole, the centrifugal drainage mechanism keeps the drain hole in a normally closed state, and when the rotating speed of the inner cylinder reaches V0, the centrifugal drainage mechanism opens the drain hole under the rotating centrifugal force of the inner cylinder.

When the washing machine executes the last rinsing program, the inner cylinder is controlled to rotate at the rotating speed V0, the rinsing and water discharging stage is entered, the electromagnetic heating device is controlled to be started, and when the inner cylinder continuously rotates at the rotating speed V0 for a set time T0, the electromagnetic heating device is controlled to be closed. In the rinsing and water discharging stage of the washing machine, a centrifugal thin water layer is formed on the wall of the inner barrel, the electromagnetic heating device is controlled to start the heating inner barrel at the moment, the high-temperature inner barrel is about 100 ℃, water is heated for wet clothes, and the water content is further reduced.

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 water discharging stage to be larger than the heating power of other rinsing stages.

Preferably, the washing machine controls the electromagnetic heating device to heat the inner cylinder at a fourth heating power P4 in a rinsing water inlet stage and at a fifth heating power P5 in a rinsing water discharge stage, wherein the fourth heating power P4 is not more than the fifth heating power P5.

As an implementation manner of this embodiment, the electromagnetic heating power of the electromagnetic heating device is adjustable, and the main controller of the washing machine stores a corresponding relationship between the clothes load section of the washing machine and the electromagnetic heating power:

when the washing machine detects that the clothes load is in the corresponding clothes load interval, the washing machine controls the electromagnetic heating device to heat with the electromagnetic heating power corresponding to the load interval.

Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (10)

1. A washing machine, characterized by comprising:

a housing;

the inner cylinder is arranged in the shell;

an electromagnetic heating coil disposed within the housing;

and an electromagnetic induction coil disposed on the inner cylinder and located at a position that can be opposed to the electromagnetic heating coil.

2. The washing machine as claimed in claim 1, further comprising an outer tub disposed in the casing, the inner tub disposed in the outer tub, the electromagnetic heating coil disposed at a bottom of a peripheral sidewall of the outer tub, the electromagnetic induction coil disposed on an inner wall surface of the peripheral sidewall of the inner tub; in the process of rotating the inner cylinder, the electromagnetic induction coil and the electromagnetic heating coil are positioned in the same radial direction of the outer cylinder.

3. The washing machine as claimed in claim 2, wherein the outer tub is provided with a positioning device having a retractable positioning post, and the inner tub is provided with a positioning hole for engaging with the positioning post;

when a positioning column of the positioning device extends out to be matched with the positioning hole to lock the inner cylinder, the electromagnetic induction coil and the electromagnetic heating coil are in opposite positions.

4. A washing machine according to any one of claims 2-3, wherein the electromagnetic coil is encapsulated by an encapsulation structure of insulating material, the encapsulation structure having a connection structure for connecting with the inner drum;

preferably, the electromagnetic heating coil is disposed on an inner wall surface of a peripheral side wall of the outer cylinder, the electromagnetic heating coil is encapsulated by an encapsulating structure made of an insulating material, and the encapsulating structure has a connecting structure for connecting with the outer cylinder.

5. A washing machine according to any one of claims 1 to 3, further comprising an electromagnetic heating driver electrically connected to the electromagnetic heating coil, the electromagnetic heating driver rectifying the alternating current into direct current and converting the direct current into high frequency alternating current;

the electromagnetic heating driver outputs high-frequency alternating current to the electromagnetic heating coil, so that a high-frequency alternating magnetic field is generated, the inner cylinder generates heat due to induction eddy current generated by electromagnetic induction in the high-frequency alternating magnetic field, and water in the inner cylinder is heated.

6. The washing machine as claimed in claim 5, further comprising a resonant circuit electrically connected to the electromagnetic heating driver and a temperature detection circuit coupled to the resonant circuit.

7. The control method of a washing machine according to any one of claims 1 to 6, wherein the washing machine includes an electromagnetic heating coil and an electromagnetic heating driver electrically connected to the electromagnetic heating coil, the control method comprising:

in the process of heating water in the inner barrel of the washing machine, the inner barrel is controlled to be positioned at the position where the electromagnetic induction coil is opposite to the electromagnetic heating coil, and the water temperature in the inner barrel is measured through detecting, analyzing and calculating the current feedback of the electromagnetic heating driver.

8. The control method of the washing machine as claimed in claim 7, wherein the main driver of the washing machine stores therein the set current intervals N1, N2, the current I of the electromagnetic heating driver corresponding to the set water temperatures T1, T2, the current I of the electromagnetic heating driver corresponding to the set water temperatures t.7, Tn, respectively, and the water temperature of the inner tub of the washing machine is Tn when the current I of the electromagnetic heating driver is detected, analyzed and calculated to be within the set current interval Nn during the process of heating the water in the inner tub.

9. A control method of a washing machine as claimed in claim 7 or 8, characterized in that the washing machine controls the inner drum to rotate in the process of heating the water in the inner drum, the inner drum is controlled to stop rotating every set time t0, when the positioning column of the positioning device is controlled to extend out to match with the positioning hole to lock the inner drum, the electromagnetic induction coil and the electromagnetic heating coil are in 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.

10. The control method of a washing machine according to claim 7, wherein the washing machine adjusts the heating power of the electromagnetic heating coil according to a process control of heating the water in the inner tub;

preferably, the washing machine improves the excitation pulse frequency through the electromagnetic heating driver, and the heating power of the electromagnetic heating coil can be reduced when the working circuit is in an offset state;

or the washing machine applies excitation pulse through the gap of the electromagnetic heating driver, so that the electromagnetic heating coil intermittently heats the inner cylinder, and the interval time of the intermittently heated inner cylinder is controlled to adjust the electromagnetic heating power of the washing machine;

or the electromagnetic heating driver is a controllable rectifying module, and the heating power of the electromagnetic heating coil is changed by changing the direct-current output voltage rectified by the controllable rectifying module through controlling the voltage.

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