WO2022052770A1

WO2022052770A1 - Control method for washing machine

Info

Publication number: WO2022052770A1
Application number: PCT/CN2021/113471
Authority: WO
Inventors: 赵志强; 许升; 吕佩师
Original assignee: 青岛海尔滚筒洗衣机有限公司; 海尔智家股份有限公司
Priority date: 2020-09-10
Filing date: 2021-08-19
Publication date: 2022-03-17
Also published as: EP4190961A1; EP4190961A4; CN114164607A

Abstract

A control method for a washing machine. The washing machine comprises a shell (1); an inner drum (5), which is disposed inside the shell (1) and is provided with a washing chamber for independently containing washing water; and an electromagnetic heating device, which is disposed inside the shell (1) and correspondingly heats a side wall of the inner drum (5). The control method comprises: when executing a last rinse program and/or a spin program, a washing machine controlling an electromagnetic heating device to be turned on to heat the inner drum (5). By means of the control method for a washing machine, thermal spinning of laundry is realized. The electromagnetic heating device heats the inner drum (5), such that the laundry has a lower water content, and quick air drying/drying in the sun/drying is facilitated, thereby improving the usage experience of a user.

Description

A method of controlling a washing machine

technical field

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

Background technique

As one of the most widely used household appliances in people's daily life, washing machines help people get rid of the trouble of laundry and bring great convenience to people. However, the existing washing machines generally include an inner tub and an outer tub, and a plurality of dehydration holes are distributed on the tub wall of the inner tub. During the washing process, the washing water between the inner tub and the outer tub will not be used, causing this part of the washing process. Water is wasted, and the dirt generated during the washing process will accumulate as the water flows between the inner barrel and the outer barrel. With long-term use, the accumulation of dirt will affect the washing effect and reduce the user experience.

In order to solve the above problems, some patents have been proposed. For example, the application number is 201410215346.3, and the Chinese invention patent is called a drum washing machine. There is a door seal between the outer cylinder and the box body, the inner cylinder is connected with the driving device, the inner cylinder is a non-porous inner cylinder, and the inner cylinder has a small diameter at the bottom of the cylinder and a large diameter at the mouth of the cylinder Conical cylinder, the cylinder mouth of the inner cylinder is closed in an arc shape, the door seal is provided with a water inlet pipe, one end of the water inlet pipe is connected with the washing water rapid heating device, and the other end of the water inlet pipe passes through the door seal It extends into the inner cylinder, and the outer cylinder is provided with a water outlet and a water pressure detection device. It can be seen from the above technical solutions that the inner cylinder of the invention is a non-porous inner cylinder, and the water inlet of the inner cylinder is realized through the water inlet conduit arranged on the door seal, and the water is drained during the dehydration process through the shape of the inner cylinder itself, which can avoid Water is stored between the inner and outer cylinders, which greatly saves the water consumption for washing.

The above invention provides a drum washing machine with a non-porous inner drum, which solves the problems of wasting water between the inner drum and the outer drum and accumulating dirt between the inner drum and the outer drum. However, traditional washing machines need to be provided on the outer drum. Some functional elements cannot be set, reducing the functionality of the non-porous inner drum washing machine. For example, most of the existing washing machines use heating pipes in the outer tub to heat the washing water to improve the washing effect, while washing machines without a porous inner tub can no longer install heating pipes on the outer tub, and thus cannot achieve heated washing. Heating washing is very important to improve the washing effect, and more and more users are using it.

In order to solve the heating and washing of the washing machine without a porous inner cylinder, the existing application number is 201811191414.1, and the Chinese invention patent application titled is a drum washing machine. The non-porous drum with dehydration holes, the side wall of the non-porous drum is provided with a clothes feeding port, and the drum is provided with a door body that can turn over to open and close the clothes feeding port; In addition, the inside of the outer drum is heated, and the heating heat is transferred to the washing water contained in the drum. By arranging the above-mentioned electromagnetic heating module on the outer drum, the drum inside the outer drum and the washing water in the drum can be heated by the electromagnetic field, thereby achieving the purpose of adjusting the temperature of the washing water in the drum of the washing machine.

The above-mentioned invention patent application adopts the electromagnetic heating method to realize the heating of the washing water of the drum washing machine without a porous inner drum, but because the dehydration effect of the non-porous inner drum is not as good as that of the porous inner drum, the moisture content of the clothes is high, and the washing effect is not good.

In view of this, the present invention is proposed to reduce the moisture content of laundry in a washing machine without a porous inner tub.

SUMMARY OF THE INVENTION

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

A control method of a washing machine. The washing machine includes a casing; an inner cylinder, which is arranged in the casing, and has a washing chamber that independently holds washing water; and an electromagnetic heating device, which is arranged in the casing and correspondingly heats the side wall of the inner cylinder. ; The control method includes: when the washing machine executes the last rinsing procedure and/or the dehydration procedure, controlling the electromagnetic heating device to turn on the heating inner tub.

Further, the dehydration program of the washing machine includes an accelerated dehydration stage in which the rotation speed of the inner drum gradually increases and a stable dehydration stage in which the rotation speed of the inner drum remains constant. The washing machine controls the electromagnetic heating device to turn on the heating inner drum at least during the accelerated dehydration stage.

Further, the washing machine controls the electromagnetic heating device to remain on during the entire accelerated dehydration stage, and is turned off when entering the stable dehydration stage.

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

Further, the stable dehydration stage includes a low-speed stable dehydration stage and a high-speed stable dehydration stage. The washing machine controls the electromagnetic heating device to be turned on at a first set time interval T1 in the low-speed stable dehydration stage, and at a second set time in the high-speed stable dehydration stage. The interval opening is performed at a fixed time interval T2, and the second set time interval T2 is greater than or equal to the first set time interval T1.

Further, the electromagnetic heating power of the described electromagnetic heating device is adjustable, and the heating power of the washing machine control electromagnetic heating device in the accelerated dehydration stage is greater than the heating power in the stable dehydration stage;

Preferably, the washing machine controls the electromagnetic heating device to heat the inner drum with the first heating power P1 in the low-speed stable dehydration stage, heat the inner drum with the second heating power P2 in the accelerated dehydration stage, and use the third heating power P3 in the high-speed stable dehydration stage. To heat the inner cylinder, the second heating power P2>the first heating power P1>the third heating power P3.

Further, the last rinsing procedure of the washing machine includes a rinsing water inlet stage, a rinsing washing stage and a rinsing and draining stage, and the washing machine controls the electromagnetic heating device to be turned on at least in the rinsing and draining stage.

Further, a drainage hole is arranged on the side wall of the inner cylinder, and a centrifugal drainage mechanism for controlling its opening and closing 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 holes by the centrifugal force of the rotation of the inner cylinder;

When the washing machine performs the last rinsing procedure, the inner drum is controlled to rotate at the rotational speed V0 to enter the rinsing and draining stage, and the electromagnetic heating device is controlled to be turned on.

Further, the electromagnetic heating power of the electromagnetic heating device is adjustable, and the heating power of the washing machine control electromagnetic heating device in the rinsing and draining stage is greater than the heating power in other rinsing stages;

Preferably, the washing machine controls the electromagnetic heating device to heat the inner cylinder with a fourth heating power P4 in the rinsing water inlet stage, and heat the inner cylinder with a fifth heating power P5 in the rinsing and draining stage, where the fourth heating power P4≤fifth heating power Heating power P5.

Further, 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 interval of the washing machine and the electromagnetic heating power:

When the washing machine detects that the laundry load is in the corresponding laundry load interval, the washing machine controls the electromagnetic heating device to perform heating with electromagnetic heating power corresponding to the load interval.

The invention provides a washing machine, which can greatly reduce the washing water consumption of the washing machine without filling washing/rinsing water between the inner tub and the outer tub. Avoid the possibility of dirt adhesion between the inner cylinder and the outer cylinder. It greatly improves user health and user experience, and greatly saves water resources. In addition, the washing machine of this embodiment utilizes the electromagnetic heating device to achieve non-contact heating of the inner tub, thereby heating the washing water in the inner tub, realizing the heating washing function of the washing machine with the non-porous inner tub, and improving the washing effect of clothes.

The control method of the washing machine of the present invention includes: when the washing machine performs the last rinsing procedure and/or the dehydration procedure, controlling the electromagnetic heating device to turn on the heating inner tub. The invention realizes the thermal dehydration of the clothes, the electromagnetic heating device heats the inner cylinder, and the clothes have lower moisture content, which is convenient for quick drying/drying/drying, and improves the user experience.

Description of drawings

Fig. 1 is the front view of the washing machine of the present invention;

Fig. 2 is a sectional view along X-X plane in Fig. 1;

FIG. 3 is another cross-sectional view taken along the X-X plane in FIG. 1 .

Description of the symbols in the accompanying drawings: 1, casing; 2, door; 3, main controller; 4, outer cylinder; 5, inner cylinder; 6, lifting rib; 7, electromagnetic heating driver; 8, electromagnetic heating coil; 9. Foot; 10. Packaging structure; 11. Drain pipe; 12. Magnetic strip; 13. Drainage device; 14. Inner cylinder door; 15. Sealed cabin structure; 16. Detergent delivery box; 17. Upper panel; 18 , Electromagnetic induction coil.

detailed description

Below in conjunction with accompanying drawing, the control method of a kind of washing machine of the present invention is described in detail:

Example 1

A washing machine of the present embodiment includes a casing; an inner tub disposed in the casing and having a washing chamber independently containing washing water; and an electromagnetic heating device disposed in the casing and correspondingly heating the sidewall of the inner tub.

This embodiment provides a washing machine, which can greatly reduce the washing water consumption of the washing machine without filling the washing/rinsing water between the inner tub and the outer tub. Avoid the possibility of dirt adhesion between the inner cylinder and the outer cylinder. It greatly improves user health and user experience, and greatly saves water resources. In addition, the washing machine of this embodiment utilizes the electromagnetic heating device to achieve non-contact heating of the inner tub, thereby heating the washing water in the inner tub, realizing the heating washing function of the washing machine with the non-porous inner tub, and improving the washing effect of clothes.

The casing of the washing machine in this embodiment is provided with an outer cylinder, the inner cylinder is set in the outer cylinder, and the electromagnetic heating device is set on the side wall of the outer cylinder; or, the casing of the washing machine in this embodiment does not have an outer cylinder. , the electromagnetic heating device is directly arranged on the inner wall of the casing and is opposite to the side wall of the inner cylinder.

The control method of the washing machine in this embodiment includes: when the washing machine executes the last rinsing procedure and/or the dehydration procedure, controlling the electromagnetic heating device to turn on the heating inner tub. This embodiment realizes thermal dehydration of the clothes, the electromagnetic heating device heats the inner cylinder, and the clothes have a lower moisture content, which is convenient for quick drying/drying/drying, and improves the user experience.

Further, the dehydration program of the washing machine in this embodiment includes an accelerated dehydration stage in which the rotation speed of the inner drum gradually increases and a stable dehydration stage in which the rotation speed of the inner drum remains unchanged.

When the washing machine of this embodiment executes the dehydration procedure, the inner drum rotates at a high speed, so a "centrifugal thin water layer" is formed on the drum wall of the inner drum. At this time, the electromagnetic heating device is controlled to start the heating of the inner drum, so as to realize the high temperature inner drum. About 100 ℃, heating and drying water for wet clothes, reducing the moisture content.

The control method of the washing machine in this embodiment controls the electromagnetic heating device to turn on the heating inner cylinder in the accelerated dehydration stage of the dehydration program. For example, the electromagnetic heating is stopped steadily at 600 revolutions, and the electromagnetic heating is performed during the process of starting to increase to 800 revolutions; the electromagnetic heating is stopped steadily at 800 revolutions. , start to increase to 1000 rpm for electromagnetic heating; 1000 rpm to stop electromagnetic heating steadily, start to increase to 1200 rpm for electromagnetic heating; 1200 rpm to stably stop electromagnetic heating, and start to increase to 1400 rpm during the process Conduct electromagnetic heating. In the stable state of rotation speed, there are very few "centrifugal thin water layers" to prevent the electromagnetic module from heating the inner cylinder too high and damaging the clothes

As an implementation of this embodiment, the washing machine controls the electromagnetic heating device to remain on during the entire accelerated dehydration stage, and is turned off when entering the stable dehydration stage.

As another implementation of this embodiment, the washing machine controls the electromagnetic heating device to be turned on at set time intervals during the stable dehydration stage. Since there are few "centrifugal thin water layers" in the stable dehydration stage, the heating at intervals can not only avoid energy loss, but also reduce the moisture content of clothes to a certain extent.

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 a first set time interval T1 in the low-speed stable dehydration stage, and at a second set time in the high-speed stable dehydration stage. The interval opening is performed at a fixed time interval T2, and the second set time interval T2 is greater than or equal to the first set time interval T1.

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.

As an implementation of this embodiment, the last rinsing procedure of the washing machine of this embodiment includes a rinsing water intake stage, a rinsing washing stage and a rinsing draining stage, and the washing machine controls the electromagnetic heating device to be turned on at least in the rinsing and draining stage. In this embodiment, the electromagnetic heating device is controlled to be turned on during the rinsing process, the inner drum is heated, and the clothes are heated and then enter the dehydration process, so as to achieve the effect of "heat dehydration", improve the dehydration effect, and further reduce the moisture content of the clothes.

Further, a drainage hole is arranged on the side wall of the inner cylinder, and a centrifugal drainage mechanism for controlling its opening and closing 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 by the centrifugal force of the rotation of the inner cylinder.

When the washing machine performs the last rinsing procedure, the inner drum is controlled to rotate at the rotational speed V0 to enter the rinsing and draining stage, and the electromagnetic heating device is controlled to be turned on. During the rinsing and draining stage of the washing machine, a "centrifugal thin water layer" is formed on the wall of the inner drum. At this time, the electromagnetic heating device is controlled to start the heating of the inner drum to achieve a high temperature of about 100 °C in the inner drum. The heating and drying water for wet clothes is further reduced. moisture content.

Further, the electromagnetic heating power of the electromagnetic heating device is adjustable, and the heating power of the washing machine control electromagnetic heating device in the rinsing and draining stage is greater than the heating power in other rinsing stages.

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 interval of the washing machine and the electromagnetic heating power:

Embodiment 2

As shown in FIG. 1 and FIG. 2 , this embodiment provides a washing machine, including:

outer cylinder 4;

The inner cylinder 5 is arranged in the outer cylinder 4;

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

and an electromagnetic heating driver 7, which is electrically connected to the electromagnetic heating coil 8, and 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 high-frequency alternating current to the electromagnetic heating coil 8, thereby generating a high-frequency alternating magnetic field. water in the tank 5.

The heating/drying program of the washing machine in this embodiment is started, and the current and voltage are converted into direct current through the electromagnetic heating driver 7, so that the direct current becomes a high-frequency alternating current that exceeds the audio frequency, and the high-frequency alternating current with a frequency of 0-100KHz is output to the electromagnetic heating coil. 8, a high-frequency alternating magnetic field is generated; the electromagnetic induction line acts on the inner cylinder of metal material, and a strong eddy current is generated in the metal inner cylinder due to electromagnetic induction. The conversion to thermal energy realizes the heating of the inner cylinder and heats the water in the inner cylinder.

Preferably, the washing machine of this embodiment is a drum washing machine with a non-porous inner drum front-opening structure, which has a simple structure and can greatly reduce the washing of the washing machine without filling washing/rinsing water between the inner drum and the outer drum. water consumption. Avoid the possibility of dirt adhesion between the inner cylinder and the outer cylinder. It greatly improves user health and user experience, and greatly saves water resources.

The washing machine of this embodiment adopts a non-porous inner drum, and the inner drum independently holds the washing water during washing. The resistance wire heating method of the traditional washing machine cannot realize the washing water heating of the non-porous inner drum washing machine, and the inner drum needs to be rotated during the washing process. It is also impossible to set a heating device in the inner tub to heat the water in the inner tub. Therefore, the washing machine without a porous inner tub of this embodiment uses the electromagnetic heating coil 8 to heat the side wall of the inner tub 5, and the side wall of the inner tub 5 is heated. The electromagnetic heating coil 8 heats and then transfers the heat to the washing water in the inner tub 5 to realize the heating of the washing water.

In addition, due to the resistance wire heating method used in the existing washing machine, the resistance wire is directly heated by immersing in the water. Due to the complex water quality environment, with the increase of time, scale deposits on the resistance wire, and it is not easy to clean due to the installation location. , resulting in a gradual decrease in heating efficiency, or even damage. In this embodiment, the electromagnetic heating device is used to realize non-contact heating, which can avoid the above problems, greatly prolong the service life, and maintain long-term high-efficiency heating.

In order to realize electromagnetic heating, the inner cylinder of this embodiment is made of ferrous material, which can cut the alternating magnetic field lines generated by the electromagnetic heating coil 8 to generate alternating current (ie eddy current), and the eddy current makes the carriers on the inner cylinder side wall High-speed random motion, the carriers collide and rub against each other to generate heat energy to heat the water in the inner cylinder.

As an implementation of this embodiment, the electromagnetic heating coil 8 described in this embodiment is disposed on the inner wall surface of the peripheral side wall of the outer cylinder 4, and the electromagnetic heating coil 8 is packaged by the packaging structure 10 of insulating material, so The packaging structure 10 described has a connecting structure for connecting with the outer cylinder.

The electromagnetic heating coil 8 in this embodiment is a high-frequency resonant coil, the coil is made of copper wire concentrically wound, and the electromagnetic heating coil 8 is packaged by the packaging structure 10 to avoid the contact between water and the electromagnetic induction coil 18. Improve reliability and safety.

As an implementation of the present embodiment, the electromagnetic heating coil 8 and the electromagnetic induction coil 18 of the present embodiment are provided with a plurality of magnetic strips 12 on the backs to absorb the magnetic induction lines and reduce the leakage of the magnetic induction lines.

As an implementation of this embodiment, the washing machine described in this embodiment further includes a resonance circuit electrically connected with the electromagnetic heating driver and a temperature detection circuit coupled with the resonance circuit. In this embodiment, the current of the feedback electromagnetic heating driver 7 is detected by the temperature detection circuit, and the water temperature in the inner cylinder 5 is measured by feedback.

As an implementation of this embodiment, the outer cylinder 4 described in this embodiment is provided with a positioning device, the positioning device has a retractable positioning column, and the inner cylinder 5 has a positioning column for matching with the positioning column. The positioning hole of the positioning device extends out and cooperates with the positioning hole to lock the inner cylinder 5. In this embodiment, the positioning device locks the inner cylinder 5, and at the same time cooperates with the detection and feedback of the current of the electromagnetic heating driver 7, and performs a temperature measurement method of feedback and measuring the water temperature in the inner cylinder 5, which can improve the accuracy of temperature measurement.

The drum washing machine of this embodiment has a casing 1, and the casing 1 includes: a top panel 17, a front panel, a back panel and a bottom panel. Bottom feet 9 are installed and fixed on the bottom plate for supporting the entire washing machine. The casing 1 has an outer cylinder 4 inside, and an inner cylinder 5 is coaxially provided in the outer cylinder 4 . The main purpose of the outer cylinder 4 is to collect the drainage of the inner cylinder 5 and the drainage of the inner cylinder 5 high-speed centrifugal dehydration. The inner cylinder 5 rotates, preferably a lifting rib 6 is provided to continuously lift and drop the clothes, so as to wash the clothes. The inner cylinder 5 has a non-porous structure, and the outer cylinder 4 has a central mounting hole, where the bearing is installed and fixed. The inner cylinder shaft, which is firmly connected to the inner cylinder 5, passes through the bearing shown and is connected to the drive motor. An openable/closable inner cylinder door 14 is installed on the 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 the inflow of water into the non-porous inner cylinder of this embodiment, the driving motor of the drum washing machine of this embodiment drives the inner cylinder 5 to rotate through the transmission connection between the inner cylinder shaft and the inner cylinder 5, and the inner cylinder shaft has a connecting inner cylinder. The hollow channel inside the drum 5, the water inlet pipeline of the washing machine is communicated with the hollow channel of the inner drum shaft.

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

When water enters, the gas in the sealed chamber of the inner cylinder can be overflowed through the equalizing mechanism under pressure to ensure the air pressure balance.

When the water is suddenly cut off, the external atmosphere can quickly enter the sealed chamber of the inner cylinder, and destroy the back suction, ensure the air pressure balance, and prevent the washing water from being sucked into the tap water pipe network.

In other cases, such as dehydration, the air pressure balance mechanism can also ensure the air pressure balance of the inner cylinder.

As an implementation of this embodiment, the air pressure balancing mechanism includes a pressure equalizing channel provided on the inner cylinder 5 , and one end of the pressure equalizing channel that communicates with the interior of the inner cylinder 5 is disposed on the inner cylinder 5 near the central axis of rotation The position is always higher than the highest water level position in the inner cylinder 5.

Specifically, the pressure equalizing hole is opened on the inner cylinder shaft to communicate the interior of 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 hole.

The pressure equalizing channel in this embodiment includes a first channel section and a second channel section. The first channel section is arranged in parallel with the hollow channel, one end of which communicates with the interior of the inner cylinder, and one end of the second channel section is communicated with the first channel section. , the other end extends to the outer peripheral wall of the inner cylinder shaft and communicates with the interior of the outer cylinder. Preferably, the second channel section is perpendicular to the first channel section to form an L-shaped pressure equalizing channel.

This embodiment provides a front-loading drum washing machine with an inner drum. An inner drum door 14 is arranged on the inner drum 5 to realize washing in the closed space of the inner drum 5, and to avoid the possibility of the clothes in the inner drum 5 coming out, and the clothes being pressed and beaten. The inner cylinder flows out or splashes water, which avoids the possibility of dirt adhesion between the inner and outer cylinders, and truly realizes that there is no water between the cylinders of the drum.

The washing machine of this embodiment has a door lock detection device that locks the inner tub door lock in place to ensure that the inner tub door is locked in place and the locking determination accuracy is 100%. If the door is not locked properly, a safety accident will occur, which greatly improves the safety of the machine, user health and user experience.

In order to realize the drainage of the non-porous inner cylinder, a drainage hole is provided on the side wall of the inner cylinder in this embodiment, and a centrifugal drainage mechanism is installed on the drainage hole. When the washing water needs to be drained, the inner cylinder is controlled to rotate at a high speed, and the centrifugal mechanism descends and opens the drain hole under the centrifugal action of the high-speed rotation, and the washing water is discharged from the drain hole. Preferably, the centrifugal drainage mechanism is arranged in the inner chamber of the lifting rib 6 .

The front panel of the cabinet of this embodiment has a clothes feeding port and a door 2 installed on the clothes feeding port to control its opening and closing.

In this embodiment, the main controller 3 of the washing machine is arranged on the upper part of the front plate of the casing, and the inside of the casing 1 is located above the outer cylinder 4 and is provided with a detergent dispensing box 16 for dispensing the detergent.

The bottom of the outer cylinder 4 in this embodiment 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 casing 1 .

This embodiment also provides a method for controlling a washing machine. During the process of heating the water in the inner tub, the washing machine measures the water temperature in the inner tub by detecting, analyzing and calculating the current feedback of the electromagnetic heating driver 7 .

The washing machine of this embodiment uses electromagnetic heating to heat the washing water, and uses an integrated resonance circuit to measure the heating temperature of the washing water.

During the electromagnetic heating process, the temperature of the electromagnetic heating coil 8 basically does not change much, but the temperature of the inner cylinder wall is consistent with the water temperature, which leads to an increase in the temperature of the inner cylinder wall and an increase in resistance, which is a variable RT.

The eddy current of the metal inner cylinder also affects the electromagnetic heating coil 8 to form an oscillation circuit together. The electromagnetic heating coil 8 itself has a resistance R, and the eddy current of the metal inner cylinder also forms a variable resistance Rx to the electromagnetic heating coil 8 . It further affects the current of the electromagnetic heating driver, analyzes and calculates the current of the electromagnetic heating driver, and feeds back the water temperature of the inner cylinder.

Therefore, the washing machine of the present embodiment uses the principle of electromagnetic heating to measure the water temperature in the inner cylinder 5 through the mutual electromagnetic induction change between the electromagnetic heating coil 8 and the cylinder wall of the metal inner cylinder, which reduces the number of temperature sensors and simplifies the structure of the washing machine. , reducing the cost of washing machines.

Further, the main controller of the washing machine stores the set current intervals N1, N2, ......, Nn, in the process of heating the water in the inner tub of the washing machine, when the current I of the electromagnetic heating driver is within the set current range Nn through detection and analysis, the water temperature in the inner tub of the washing machine is Tn.

The washing machine of this embodiment controls the rotation of the inner tub during the process of heating the water in the inner tub. The temperature of the entire surface of the inner cylinder is made uniform by continuously rotating the inner cylinder to make the temperature uniform, so that the heat exchange between the inner cylinder water and the inner cylinder is realized and then heated uniformly.

In order to realize the temperature measurement of the water in the inner tub, as an implementation of this embodiment, the washing machine controls the rotation of the inner tub during the process of heating the water in the inner tub, and the electromagnetic heating is calculated by detecting and analyzing every set time t0. The current feedback of the drive measures the water temperature in the inner cylinder. In this way, the temperature measurement is simultaneously realized without affecting the heating process, which is simple and convenient.

In order to measure the temperature of the water in the inner tub, as an implementation of this embodiment, the washing machine controls the rotation of the inner tub during the process of heating the water in the inner tub, and controls the inner tub to stop rotating every set time t0 , the positioning column of the positioning device is controlled to extend to cooperate with the positioning hole to lock the inner cylinder, and the water temperature in the inner cylinder is measured by detecting, analyzing and calculating the current feedback of the electromagnetic heating driver. In this way, the temperature is measured after the inner cylinder is locked by the positioning device, so as to avoid current fluctuation, and the measurement result is more accurate.

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 tub.

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

According to the load, the set temperature, the water level and other parameters, variable power electromagnetic heating can be performed: for example, high water level and multi-load conditions can be used for high-power heating; while low water level and small load conditions can be used for low-power heating.

Another example is that the electromagnetic heating power is relatively large in the early stage, and when the set temperature is soon reached, low-power heating is performed to achieve precise temperature heating.

Another example is that if the user sets a high temperature of 90°C for high-temperature cooking and washing, high-power heating can be used to shorten the time; if the user sets a low-temperature heating and washing at 30°C, low-power electromagnetic heating can be used.

There are various methods for adjusting the power of the electromagnetic heating of the washing machine in this embodiment, including:

The washing machine increases 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 out of tune;

Alternatively, the washing machine applies an excitation pulse through the electromagnetic heating driver gap, so that the electromagnetic heating coil intermittently heats the inner cylinder, and the interval time of the intermittent heating of the inner cylinder 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 changing the DC output voltage rectified by the controllable rectifier module by controlling the voltage.

Embodiment 3

As shown in FIG. 1 and FIG. 3 , this embodiment provides a washing machine, including:

outer cylinder 4;

The inner cylinder 5 is arranged in the outer cylinder 4;

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

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

The washing machine of this embodiment uses the electromagnetic heating coil 8 to heat the metal cylinder wall of the inner cylinder 5 by means of electromagnetic heating, and the inner cylinder 5 heats the washing water in the cylinder to realize the heating and washing function of the washing machine. In the washing machine of this embodiment, an electromagnetic induction coil 18 is arranged on the inner drum for the heating method using the electromagnetic heating coil 8. The alternating magnetic field generated by the electromagnetic induction coil 18 during the heating process reacts to the electromagnetic heating coil 8. Due to the electromagnetic induction The coil 18 is arranged in the inner cylinder 5 as the temperature of the water increases, the eddy current in the electromagnetic induction coil 18 after the temperature rises changes, and the alternating magnetic field reacting to the electromagnetic heating coil 8 also changes. The electromagnetic induction coil 18 affects the electromagnetic heating coil 8 to form an oscillation circuit together. The electromagnetic heating coil 8 itself has a resistance R, and the electromagnetic induction coil 18 forms a variable resistance R2 to the electromagnetic heating coil 8; The current of the heating driver has an influence, and the water temperature in the inner cylinder 5 is measured by feedback by analyzing and calculating the current of the electromagnetic heating driver.

Therefore, the washing machine of this embodiment utilizes the principle of electromagnetic heating to measure the water temperature in the inner tub 5 through the mutual electromagnetic induction change between the electromagnetic heating coil 8 and the electromagnetic induction coil 18, which reduces the installation of temperature sensors, simplifies the structure of the washing machine, and reduces the the cost of the washing machine.

Further, the electromagnetic heating coil 8 described in this embodiment is arranged at the bottom of the peripheral side wall of the outer cylinder 4, and the electromagnetic induction coil 18 is arranged on the inner wall surface of the peripheral side wall of the inner cylinder 5; during the rotation of the inner cylinder , the electromagnetic induction coil 18 and the electromagnetic heating coil 8 are located in the same radial direction of the outer cylinder 4 . In this way, during the heating process, it is necessary to control the rotation of the inner cylinder 5 to the position where the electromagnetic induction coil 18 and the electromagnetic heating coil 8 are in the opposite position to realize temperature measurement.

In order that the electromagnetic induction coil 18 and the electromagnetic heating coil 8 are in opposite positions to realize temperature measurement, a positioning device is provided on the outer cylinder 4 in this embodiment, and the positioning device has a retractable positioning column, and the inner cylinder 5 is provided with a positioning hole for matching with the positioning column; when the positioning column of the positioning device extends out and cooperates with the positioning hole to lock the inner cylinder, the electromagnetic induction coil 18 and the electromagnetic heating coil 8 are in relative positions.

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

The electromagnetic heating coil 8 and the electromagnetic induction coil 18 in this embodiment are high-frequency resonance coils, and the coils are concentrically wound with copper wires. The electromagnetic induction coil 18 and the electromagnetic heating coil 8 are encapsulated by the encapsulation structure 10 to avoid the contact between the water and the electromagnetic induction coil 18 and improve reliability and safety.

The washing machine of this embodiment further 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 converts the alternating current into direct current. The high-frequency alternating current is output to the electromagnetic heating coil 8, thereby generating a high-frequency alternating magnetic field. The inner cylinder generates heat due to the induction eddy current generated by electromagnetic induction in the high-frequency alternating magnetic field, and heats the water in the inner cylinder 5.

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 the magnetic induction lines and reduce the leakage of the magnetic induction lines.

As an implementation of this embodiment, the washing machine described in this embodiment further includes a resonance circuit electrically connected with the electromagnetic heating driver 7 and a temperature detection circuit coupled with the resonance circuit. In this embodiment, the current of the feedback electromagnetic heating driver 7 is detected by the temperature detection circuit, and the water temperature in the inner cylinder 5 is measured by feedback.

The present embodiment also provides a method for controlling a washing machine. The washing machine includes an electromagnetic heating coil 8 and an electromagnetic heating driver 7 electrically connected to the electromagnetic heating coil 8. The control method includes:

In the process of heating the water in the inner tub, the washing machine controls the inner tub to be at the opposite position between the electromagnetic induction coil and the electromagnetic heating coil, and measures the water temperature in the inner tub by detecting, analyzing and calculating the current feedback of the electromagnetic heating driver.

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

During the electromagnetic heating process, the temperature of the electromagnetic heating coil 8 basically changes little, but the electromagnetic induction coil 18 on the inner surface of the inner cylinder is consistent with the water temperature, resulting in an increase in the temperature of the electromagnetic induction coil 18 and an increase in resistance, and its resistance is a variable R1.

The electromagnetic induction coil 18 further affects the electromagnetic heating coil 8 to form an oscillation circuit together. The electromagnetic heating coil 8 itself has a resistance R, and the electromagnetic induction coil 18 also forms a variable resistance R2 to the electromagnetic heating coil 8 . Further, the current of the electromagnetic heating driver 7 is affected. The current analysis calculation of the electromagnetic heating driver 7 is fed back to measure the water temperature of the inner cylinder.

Further, the main controller of the washing machine stores the set current intervals N1, N2, ..., Nn of the electromagnetic heating drivers corresponding to the set water temperatures T1, T2, ..., Tn respectively. In the process of heating the water in the inner tub of the washing machine, when the current I of the electromagnetic heating driver is within the set current interval Nn through detection and analysis, the water temperature in the inner tub of the washing machine is Tn.

The washing machine of this embodiment controls the rotation of the inner tub during the process of heating the water in the inner tub. The temperature of the entire surface of the inner cylinder is uniform by continuously rotating the inner cylinder to make the temperature uniform, so that the water in the inner cylinder and the inner cylinder are exchanged for heat and then heated uniformly.

Therefore, in order to realize the temperature measurement during the heating process, the washing machine of this embodiment controls the inner cylinder to stop rotating at every set time t0, and when the positioning column of the positioning device is controlled to extend to cooperate with the positioning hole to lock the inner cylinder, The electromagnetic induction coil and the electromagnetic heating coil are in relative positions, and the water temperature in the inner cylinder is measured by detecting, analyzing and calculating the current feedback of the electromagnetic heating driver.

Another example is that the electromagnetic heating power is relatively large in the early stage, and when the set temperature is almost reached, low-power heating is performed to achieve precise temperature heating.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention in any form. Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Within the scope of the technical solution of the present invention, personnel can make some changes or modifications to equivalent examples of equivalent changes by using the above-mentioned technical content, but any content that does not depart from the technical solution of the present invention is based on the technical solution of the present invention. Substantially any simple modifications, equivalent changes and modifications made to the above embodiments still fall within the scope of the solutions of the present invention.

Claims

A control method of a washing machine. The washing machine includes a casing; an inner cylinder, which is arranged in the casing, and has a washing chamber that independently holds washing water; and an electromagnetic heating device, which is arranged in the casing and correspondingly heats the side wall of the inner cylinder. ; It is characterized in that, described control method comprises:

When the washing machine performs the last rinsing procedure and/or the dehydration procedure, the electromagnetic heating device is controlled to turn on the heating inner tub.
The control method of a washing machine according to claim 1, wherein the dehydration program of the washing machine includes an accelerated dehydration stage in which the rotation speed of the inner drum gradually increases and a stable dehydration stage in which the rotation speed of the inner drum remains unchanged, and the washing machine controls the electromagnetic heating device at least in the accelerated dehydration stage. stage to turn on the heating inner cylinder.
The control method of a washing machine according to claim 2, characterized in that the washing machine controls the electromagnetic heating device to be kept on during the entire accelerated dehydration stage, and turned off when entering the stable dehydration stage.
The control method of a washing machine according to claim 2, wherein the washing machine controls the electromagnetic heating device to be turned on at set time intervals during the stable dehydration stage.
The control method of a washing machine according to claim 4, wherein the stable dehydration stage includes a low-speed stable dehydration stage and a high-speed stable dehydration stage, and the washing machine controls the electromagnetic heating device to perform a first set time interval T1 during the low-speed stable dehydration stage. The interval opening is performed at 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.
The control method for a washing machine according to any one of claims 2-5, wherein the electromagnetic heating power of the electromagnetic heating device is adjustable, and the heating power of the electromagnetic heating device controlled by the washing machine in the accelerated dehydration stage is greater than that in the stable dehydration stage. heating power;

Preferably, the washing machine controls the electromagnetic heating device to heat the inner drum with the first heating power P1 in the low-speed stable dehydration stage, heat the inner drum with the second heating power P2 in the accelerated dehydration stage, and use the third heating power P3 in the high-speed stable dehydration stage. To heat the inner cylinder, the second heating power P2>the first heating power P1>the third heating power P3.
The control method of a washing machine according to claim 1, wherein the last rinsing procedure of the washing machine includes a rinsing water intake stage, a rinsing washing stage and a rinsing and draining stage, and the washing machine controls the electromagnetic heating device to be turned on at least in the rinsing and draining stage.
The control method of a washing machine according to claim 7, wherein a drain hole is provided on the side wall of the inner cylinder, a centrifugal drain mechanism for controlling the opening and closing of the drain hole is installed, and the centrifugal drain mechanism keeps the drain hole in the position of the drain hole. Normally closed, when the rotation speed of the inner cylinder reaches V0, the centrifugal drainage mechanism will open the drainage hole by the centrifugal force of the rotation of the inner cylinder;

When the washing machine performs the last rinsing procedure, the inner drum is controlled to rotate at the rotational speed V0 to enter the rinsing and draining stage, and the electromagnetic heating device is controlled to be turned on.
The control method of the washing machine according to claim 8, wherein the electromagnetic heating power of the electromagnetic heating device is adjustable, and the heating power of the washing machine control electromagnetic heating device in the rinsing and draining stage is greater than the heating power in other rinsing stages;

Preferably, the washing machine controls the electromagnetic heating device to heat the inner cylinder with a fourth heating power P4 in the rinsing water inlet stage, and heat the inner cylinder with a fifth heating power P5 in the rinsing and draining stage, where the fourth heating power P4≤fifth heating power Heating power P5.
The control method for a washing machine according to any one of claims 1-9, wherein the electromagnetic heating power of the electromagnetic heating device is adjustable, and the main controller of the washing machine stores the difference between the clothes load interval of the washing machine and the electromagnetic heating power. Correspondence between:

When the washing machine detects that the laundry load is in the corresponding laundry load interval, the washing machine controls the electromagnetic heating device to perform heating with electromagnetic heating power corresponding to the load interval.