WO2023000882A1 - Drum washing machine and control method therefor - Google Patents

Abstract

A drum washing machine and a control method therefor. The drum washing machine comprises: an outer tub (100); an inner tub (200) arranged in the outer tub (100), at least part of the inner tub being made of a metal material capable of generating eddy currents in an alternating magnetic field; an electromagnetic heating device (400) mounted on the outer tub (100) and generating an alternating magnetic field that radiates to the periphery to heat the inner tub (200), wherein the alternating magnetic field forms a coverage region on the outer tub (100); and a cleaning device used to eject fluid to an inner surface of the coverage area on the outer tub (100). The inner tub (200) is heated by means of the electromagnetic heating device (400) to achieve a washing water heating function, and the cleaning device can eject fluid to an inner wall of the outer tub (100), such that foreign matters remaining in the outer tub (100) are flushed away, thereby avoiding the problem that after the electromagnetic heating device (400) is started, the metal foreign matters which may exist in the region on the outer tub (100) that is covered by the alternating magnetic field are radiated by the magnetic field of the electromagnetic heating device, and the temperature rises rapidly, so that the outer tub (100) or the electromagnetic heating device (400) is damaged.

Description

A drum washing machine and its control method technical field

The invention belongs to the technical field of washing machines, and in particular relates to a drum washing machine and a control method thereof.

Background technique

Existing drum washing machines generally include an inner cylinder and an outer cylinder, and a plurality of dehydration holes are arranged on the cylinder wall of the inner cylinder. However, during the washing process, the washing water between the inner cylinder and the outer cylinder will not be utilized, resulting in waste of this part of the washing water. At the same time, part of the dirt generated during the washing process will remain between the inner cylinder and the outer cylinder, which is difficult to clean. Long-term accumulation will pollute the washing water and affect the washing effect.

In order to solve the above problems, the prior art proposes a washing machine with no dehydration holes on the inner cylinder, so that the inner cylinder can independently hold the washing water during the washing process, thereby avoiding the accumulation of water between the inner and outer cylinders during the washing process. In this case, the amount of washing water is saved, and at the same time, the accumulation of dirt between the inner and outer cylinders is largely avoided.

However, since there is no water between the inner cylinder and the outer cylinder during the washing process, it is impossible to heat the washing water by installing a heating pipe in the outer cylinder in the traditional washing machine. In order to solve the problem of heating washing water in a washing machine without a dehydration hole on the inner cylinder, a scheme of setting an electromagnetic heating module on the outer cylinder is proposed. For example, the Chinese patent application No. 201811191414.1 discloses a drum washing machine, which includes a non-porous drum installed in the housing without dehydration holes, a clothes inlet is provided on the side wall of the non-porous drum, and a reversible The door body for opening and closing the clothes inlet; the outer cylinder is set on the outside of the drum, and the outer cylinder is equipped with an electromagnetic heating module to heat the inside of the outer cylinder and transfer the heating heat to the washing water contained in the drum.

However, in the above scheme, the electromagnetic heating module generates an alternating magnetic field after being energized, and then generates an eddy current in the drum, so that the drum itself generates heat to heat the washing water. If there are other objects in the outer drum that can be excited by the alternating magnetic field, such as metal ornaments that fall off the clothes during washing and remain between the drum and the outer drum after draining, or some metal accessories are left in the outer drum when the washing machine is repaired Inside, when the electromagnetic heating module is working, the metal foreign objects in the outer cylinder will also be excited by the magnetic field and heat up, and the temperature will rise sharply. In order to avoid the influence of the electromagnetic heating module, the outer cylinder itself is generally made of plastic material. The sharp rise in temperature of metal foreign objects may cause damage to the outer cylinder, and even cause the temperature of the working environment of the electromagnetic heating module to rise sharply, causing the electromagnetic heating module to damaged condition.

In view of this, the present invention is proposed.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art, and provide a drum washing machine and its control method. A cleaning device is installed inside the drum washing machine, and the fluid remaining in the outer drum can be cleaned up by spraying fluid on the inner wall of the outer drum. Metal foreign matter, to prevent metal foreign matter in the outer cylinder from being heated by the electromagnetic heating device, causing damage to the inner wall of the outer cylinder due to excessive temperature.

In order to solve the problems of the technologies described above, the present invention adopts the basic idea of technical solution to be:

A drum washing machine, comprising:

Outer cylinder,

an inner cylinder, arranged inside the outer cylinder, at least partially made of a metal material capable of generating eddy currents in an alternating magnetic field;

An electromagnetic heating device, installed on the outer cylinder, generates an alternating magnetic field radiating to the outer circumference to heat the inner cylinder, and the alternating magnetic field forms a coverage area on the outer cylinder;

A cleaning device is also included for spraying fluid onto the inner surface of said coverage area on the outer barrel.

Further, the cleaning device includes a spray head assembly, and the spray head assembly has a nozzle for fluid ejection; the nozzle is arranged towards the inner surface of the coverage area.

Further, the electromagnetic heating device is installed on the wall of the outer cylinder, and the coverage area includes at least the projection area of the electromagnetic heating device on the wall of the outer cylinder; the nozzle faces the inner surface of the projection area on the wall set up;

Preferably, the electromagnetic heating device is installed at the bottom area of the cylinder wall;

More preferably, the electromagnetic heating device is installed outside the cylinder wall.

Further, the inner surface of the covered area is arranged obliquely downward along the direction of fluid injection;

Preferably, the nozzle ejects fluid from the bottom of the outer cylinder to the mouth of the cylinder, and the wall of the outer cylinder is a tapered surface structure whose diameter gradually increases from the bottom of the cylinder to the mouth of the cylinder.

Further, the covered area is located on the cylinder wall near the bottom of the cylinder, the nozzle assembly is installed on the bottom of the outer cylinder, and the fluid is sprayed to the inner surface of the covered area through the nozzle;

Preferably, the spray head assembly is installed on the outer periphery of the bottom of the cylinder, the nozzle passes through the bottom of the outer cylinder and is installed inside the outer cylinder, and the outer periphery of the nozzle is attached to the inner part of the cylinder wall of the outer cylinder.

Further, the coverage area has a certain extension length on the wall of the outer cylinder along the circumferential direction of the outer cylinder, the nozzle assembly has a plurality of nozzles, and the connection lines between the plurality of nozzles form a center of a circle with the bottom of the outer cylinder. arc of

Preferably, the spray head assembly also includes:

a fluid inlet for receiving fluid to be sprayed;

The main body of the nozzle extends in an arc shape and is arranged on the outer periphery of the bottom of the outer cylinder, is connected with the bottom of the outer cylinder, and has a communication channel connecting the fluid inlet and a plurality of nozzles inside.

Further, the cleaning device also includes an air pump for providing gas, the air pump communicates with the nozzle assembly, and the nozzle sprays air to the inner surface of the covered area for cleaning;

Alternatively, the cleaning device further includes a cleaning pipeline, the water inlet end of the cleaning pipeline receives external water, the water outlet end of the cleaning pipeline communicates with the nozzle assembly, and the nozzle sprays water to the inner surface of the covered area for cleaning .

Another object of the present invention is to provide a control method of the above-mentioned drum washing machine. The drum washing machine controls the cleaning device to spray fluid to the inner wall of the outer tub to clean the inner wall of the outer tub.

Further, before the laundry program starts and/or after the laundry program ends, the drum washing machine controls the cleaning device to spray fluid;

Preferably, after the drum washing machine receives the signal to start the laundry program, if it is judged that the washing water heating function is turned on, the cleaning device is controlled to spray fluid to clean the inner wall of the outer tub;

After cleaning, control the electromagnetic heating device to start heating.

Further, when the cleaning device sprays fluid, the drum washing machine controls the inner cylinder to rotate in the outer cylinder;

Preferably, when the cleaning device sprays fluid, the drum washing machine also controls the inner cylinder to drain water to the outer cylinder.

After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art.

In the drum washing machine of the present invention, the area covered by the alternating magnetic field generated by the electromagnetic heating device on the inner wall of the outer cylinder can be cleaned up by setting the cleaning device to spray fluid on the inner wall of the outer cylinder, such as spraying air or water, and avoiding the damage of the alternating magnetic field. Metal foreign matter remains in the covered area, and the temperature rises sharply when the electromagnetic heating device is working, resulting in damage to the outer cylinder or the electromagnetic heating device.

In the drum washing machine of the present invention, the nozzle is directed toward the inner surface of the covered area, and the fluid is sprayed concentratedly to the action area of the electromagnetic heating device, and the cleaning efficiency is higher. The area is heated, and the heating efficiency is high. The electromagnetic heating device is installed on the outside of the cylinder wall. On the one hand, it can avoid contact with the washing water, and on the other hand, it can avoid the hindrance to the cleaning of metal foreign objects when the electromagnetic heating device is installed inside the outer cylinder.

In the drum washing machine of the present invention, the inner surface of the covered area is inclined downward along the fluid injection direction, and when the ejected fluid acts on the metal foreign matter in the outer cylinder, it is easier to drive the metal foreign matter to move, thereby being covered by the alternating magnetic field. area, the cleaning effect on metal foreign objects is better. The nozzle fits the inner side of the outer cylinder wall, so that the fluid is sprayed close to the inner surface of the cylinder wall, and flows along the inner surface of the cylinder wall to clean up the metal foreign matter, which has a stronger impact on the metal foreign matter and further improves the resistance of the metal foreign matter. removal efficiency.

In the drum washing machine of the present invention, a plurality of nozzles are arranged along the circular arc that is co-centered with the bottom of the outer cylinder, and at the same time, fluid is sprayed into the outer cylinder for cleaning. Cleaning is more thorough to avoid metal foreign matter residues.

The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

Description of drawings

The accompanying drawings, as a part of the present invention, are used to provide a further understanding of the present invention, and the schematic embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute improper limitations to the present invention. Apparently, the drawings in the following description are only some embodiments, and those skilled in the art can also obtain other drawings according to these drawings without creative efforts. In the attached picture:

Fig. 1 is the structural representation of washing machine in the embodiment of the present invention;

Fig. 2 is the explosion diagram of washing machine in the embodiment of the present invention;

Fig. 3 is a schematic structural view of the inner side of the outer cylinder in an embodiment of the present invention;

Fig. 4 is a schematic structural view of a spray head assembly in an embodiment of the present invention.

In the figure: 100, outer cylinder; 110, cylinder wall; 120, cylinder bottom; 200, inner cylinder; 201, drainage hole; 300, nozzle assembly; 310, nozzle main body; 320, spout; 330, fluid inlet; 400, electromagnetic heating equipment.

It should be noted that these drawings and text descriptions are not intended to limit the concept scope of the present invention in any way, but illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments.

detailed description

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention , but not to limit the scope of the present invention.

In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "inner" and "outer" are based on the Orientation or positional relationship is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention.

In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral ground connection; it can be directly connected or indirectly connected through an intermediary. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

As shown in Figures 1 to 4, an embodiment of the present invention provides a drum washing machine, including:

Outer cylinder 100,

The inner cylinder 200 is arranged in the outer cylinder 100 and is at least partially made of a metal material that can generate eddy currents in an alternating magnetic field;

The electromagnetic heating device 400 is installed on the outer cylinder 100 , and generates an alternating magnetic field radiating to the outer circumference to heat the inner cylinder 200 , and the alternating magnetic field forms a covering area on the outer cylinder 100 .

Specifically, the electromagnetic heating device 400 includes a coil, and when a high-frequency alternating current is passed into the coil, the coil can generate a high-frequency alternating magnetic field. The high-frequency alternating magnetic field generated by the coil radiates to the inner cylinder 200 made of metal, which can cause the inner cylinder 200 to generate eddy currents under the action of electromagnetic induction. The inner tub 200 generates heat by itself, thereby heating the wash water therein.

In order to prevent the outer cylinder 100 from heating under the action of the electromagnetic heating device 400, the outer cylinder 100 can be made of a material that is not excited by the magnetic field, such as plastic, and can also avoid the alternating magnetic field formed by the outer cylinder 100 on the electromagnetic heating device 400. influences.

The drum washing machine in this embodiment further includes a cleaning device, which is used to spray fluid to the inner surface of the covered area on the outer tub 100 . When the electromagnetic heating device 400 is working, the metal objects within the coverage of the alternating magnetic field generated by the electromagnetic heating device 400 may be excited by the magnetic field and generate heat. By controlling the cleaning device to spray fluid, such as water or air, to the inner wall of the outer cylinder 100 , especially the area covered by the alternating magnetic field, the foreign matter present on the inner wall of the outer cylinder 100 can be washed away. In this way, when the electromagnetic heating device 400 is working, it is possible to avoid metal foreign objects that are heated by the electromagnetic heating device 400 in the outer cylinder 100, thereby preventing the metal foreign objects that heat up rapidly in the outer cylinder 100 after the electromagnetic heating device 400 is turned on. The case where the cartridge 100 or the electromagnetic heating device 400 is damaged.

The cleaning device in this embodiment includes a spray head assembly 300, and the spray head assembly 300 has a nozzle 320 for spraying fluid. The nozzle 320 is arranged towards the inner surface of the covering area, so that the inner surface of the alternating magnetic field covering area is cleaned by the sprayed fluid.

In a specific solution of this embodiment, the nozzle 320 of the nozzle assembly 300 sprays air to the inner surface of the covered area for cleaning.

Specifically, the cleaning device further includes an air pump for supplying gas, and the air pump communicates with the spray head assembly 300 to deliver high-pressure gas to the spray head assembly 300 . The high-pressure gas is ejected through the nozzle 320, and the part of the inner wall of the outer cylinder 100 that is in the covered area is cleaned.

In detail, the nozzle assembly 300 is provided with a fluid inlet 330 communicating with the nozzle 320 , and the air pump communicates with the fluid inlet 330 through a pipeline to provide high-pressure gas to the nozzle assembly 300 . The high-pressure gas enters the nozzle assembly 300 through the fluid inlet 330, and then sprays out to the inner wall of the outer cylinder 100 through the nozzle 320, blowing out the metal foreign matter remaining in the covering area of the alternating magnetic field in the outer cylinder 100.

In this embodiment, the air pump is arranged inside the washing machine to provide high-pressure air to the spray head assembly 300 .

In another solution, a gas delivery pipe can also be provided on the fluid inlet 330 , the air inlet end of the gas delivery pipe is located outside the washing machine, and is connected to an external air source to provide high-pressure gas to the spray head assembly 300 .

In another specific solution of this embodiment, the nozzle 320 of the nozzle assembly 300 sprays water to the inner surface of the covered area for cleaning.

Specifically, the cleaning device also includes a cleaning pipeline, the water inlet end of the cleaning pipeline receives external water as cleaning water, the water outlet end of the cleaning pipeline communicates with the nozzle assembly 300, and delivers the cleaning water to the nozzle assembly 300. water. The cleaning water is sprayed out through the nozzle 320 to clean the part of the inner wall of the outer cylinder 100 within the covered area.

In detail, the nozzle assembly 300 is provided with a fluid inlet 330 communicating with the nozzle 320 , and the outlet end of the cleaning pipeline is connected to the fluid inlet 330 . The water inlet end of the cleaning pipeline can be connected with the water inlet valve of the drum washing machine, and the external water is obtained as cleaning water through the water inlet valve, and then delivered to the nozzle assembly 300 through the cleaning pipeline. Cleaning water enters the nozzle assembly 300 through the fluid inlet 330, and then sprays out to the inner wall of the outer cylinder 100 through the nozzle 320, and the metal foreign matter remaining in the covered area of the alternating magnetic field in the outer cylinder 100 is washed out of the area by the water flow.

Preferably, a booster pump for water flow boosting is provided on the cleaning pipeline, which can increase the water pressure sprayed out from the spout 320, thereby increasing the impact force of the sprayed water flow on the inner wall of the outer cylinder 100, thereby more effectively cleaning the outer cylinder 100. metal foreign bodies in the

In a further solution of this embodiment, the electromagnetic heating device 400 is installed on the cylinder wall 110 of the outer cylinder 100 , and the coverage area at least includes the projection area of the electromagnetic heating device 400 on the cylinder wall 110 of the outer cylinder 100 . Correspondingly, the nozzle 320 of the nozzle assembly 300 is disposed toward the inner surface of the projection area, and the inner surface of the projection area sprays high-pressure gas or cleaning water flow.

Preferably, the electromagnetic heating device 400 is installed at the bottom area of the cylinder wall 110 of the outer cylinder 100, and heats the inner cylinder 200 from below, so that the alternating magnetic field generated by it is concentrated and radiated at the bottom area of the inner cylinder 200, that is, where the washing water is concentrated. area for higher heating efficiency.

More preferably, the electromagnetic heating device 400 is installed outside the cylinder wall 110 , that is, installed outside the outer cylinder 100 .

The electromagnetic heating module is installed outside the outer cylinder 100 instead of between the inner cylinder 200 and the outer cylinder 100. On the one hand, it can prevent the electromagnetic heating device 400 from being in direct contact with the drainage water flow when the washing machine is draining, which reduces the impact on the electromagnetic heating device 400 to a certain extent. Sealing performance requirements.

On the other hand, as shown in FIG. 3 , the inner side of the cylinder wall 110 can form a smooth surface, that is, the inner surface of the covered area is smooth and unobstructed, and metal foreign objects are easier to move out under the impact of high-pressure gas or cleaning water. The area covered by the magnetic field. However, if the electromagnetic heating device is installed inside the outer cylinder, the electromagnetic heating device itself may block the movement of the metal foreign matter, and even the metal foreign matter may be stuck in the gap between the electromagnetic heating device and the outer cylinder and it is difficult to clean.

In detail, in this embodiment, ribs are provided on the outer surface of the bottom of the cylinder wall 110 , and the ribs enclose a rectangular area at the bottom of the cylinder wall 110 of the outer cylinder 100 , and the electromagnetic heating device 400 is installed in the rectangular area.

In a further solution of this embodiment, the inner surface of the covered area is arranged obliquely downward along the direction of fluid injection. The inner surface of the covered area is set as an inclined surface, and when the metal foreign body is subjected to the impact force of the fluid, it is easier to slide down along the inclined surface, thereby being washed out of the covered area, avoiding the alternating magnetic field generated by the electromagnetic heating device 400 radiation.

In this embodiment, the nozzle 320 sprays fluid from the bottom 120 of the outer cylinder 100 toward the mouth of the cylinder, and the cylinder wall 110 of the outer cylinder 100 is a tapered surface structure whose diameter gradually increases from the bottom 120 to the mouth of the cylinder. The cylinder wall 110 of the outer cylinder 100 is provided with a tapered surface structure, and when the fluid is sprayed out from the nozzle 320, the metal foreign matter is more likely to slide towards the cylinder mouth under the impact of the fluid, thereby being moved out of the coverage area of the alternating magnetic field.

Further, the wall 110 of the outer cylinder 100 is also provided with a water outlet (not shown in the figure), which is located at the bottom area of the wall 110 relatively close to the mouth, that is, in front of the covered area. Metal foreign matter in the outer cylinder 100 moves forward along the axial direction of the outer cylinder 100 under the impact force of the fluid, and finally can be discharged through the drain port.

In this embodiment, the coverage area is located on the cylinder wall 110 close to the cylinder bottom 120 , the nozzle assembly 300 is installed on the cylinder bottom 120 of the outer cylinder 100 , and sprays fluid to the inner surface of the coverage area through the nozzle 320 .

Preferably, the spray head assembly 300 is installed on the outer circumference of the cylinder bottom 120 , the nozzle 320 passes through the cylinder bottom 120 of the outer cylinder 100 and is installed inside the outer cylinder 100 , and the outer circumference of the nozzle 320 is attached to the inner part of the cylinder wall 110 of the outer cylinder 100 .

In the above solution, the nozzle 320 extends into the interior of the outer cylinder 100 through the bottom 120 of the outer cylinder 100 , and sprays fluid to the inner surface of the covered area of the alternating magnetic field. The nozzle assembly 300 is arranged on the outer periphery of the cylinder bottom 120, which can reduce the occupation of the space behind the cylinder bottom 120, and at the same time be closer to the cylinder wall 110 of the outer cylinder 100, so that it is easier to set the nozzle 320 so that the outer circumference and the inside of the cylinder wall 110 fit together state. The nozzle 320 is attached to the inner surface of the cylinder wall 110, so that the fluid is sprayed out close to the inner surface of the cylinder wall 110, which increases its flow velocity on the inner surface of the cylinder wall 110, and can generate a stronger impact force on the metal foreign body. Therefore, the metal foreign matter is washed out of the covered area of the alternating magnetic field, and the cleaning efficiency of the cleaning device for foreign matter in the outer cylinder 100 is improved.

In a further solution of this embodiment, the electromagnetic heating device 400 has a certain extension length along the circumferential direction of the outer cylinder 100, and correspondingly, the coverage area of the alternating magnetic field also has a certain extension length along the circumferential direction of the outer cylinder 100 on the cylinder wall 110 of the outer cylinder 100. Extended length.

In order to ensure the scouring area of the sprayed fluid, the spray head assembly 300 has a plurality of nozzles 320, and the multiple nozzles 320 can simultaneously spray fluid to clean the inner surface of the covered area. The metal foreign matter can be cleaned more thoroughly to avoid the existence of metal foreign matter residue.

In this embodiment, the connecting line between the plurality of nozzles 320 forms a circular arc concentric with the bottom 120 of the outer cylinder 100 , and preferably the plurality of nozzles 320 are evenly distributed along the circumference of the bottom 120 of the outer cylinder 100 . In this way, the distances between the plurality of nozzles 320 and the cylinder wall 110 of the outer cylinder 100 can be guaranteed to be equal, and the scouring effect of the sprayed fluid in the covered area is more uniform, and it is easier to control the moving direction of the metal foreign matter when it is scouted. It is parallel to the axial direction of the outer cylinder 100, so that it is easier to wash the metal foreign matter out of the covered area of the alternating magnetic field.

Specifically, the nozzle assembly 300 of this embodiment is provided with three nozzles 320, the middle nozzle 320 is located in the middle of the coverage area along the circumferential extension of the outer cylinder 100, the nozzles 320 at both ends are located inside the extension, and respectively near one end of the extension. The three nozzles 320 cooperate with each other and spray fluid outward at the same time, which can realize effective cleaning of metal foreign objects.

In a preferred solution of this embodiment, the extension length of the electromagnetic heating device 400 along the circumferential direction of the outer cylinder 100 is greater than its extension length along the axial direction of the outer cylinder 100 . The electromagnetic heating device 400 increases the heating area by extending along the circumferential direction of the outer cylinder 100, so that it does not need to occupy a large area in the axial direction of the outer cylinder 100, so that it can avoid occupying the bottom area of the cylinder wall 110 along the axial direction of the outer cylinder 100. Excessive space interferes with the water outlet also arranged at the bottom area of the cylinder wall 110 . Higher heating efficiency can be achieved by arranging the electromagnetic heating device 400 to extend in the circumferential direction of the outer cylinder 100 to provide a larger heating area.

On the other hand, the metal foreign matter in the outer cylinder 100 moves nearly along the axial direction of the outer cylinder 100 under the impact force of the fluid ejected from the nozzle 320, shortening the extension length of the electromagnetic heating device 400 along the axial direction of the outer cylinder 100, and the covering The extension length of the area along the axial direction of the outer cylinder 100 is correspondingly shortened, which is equivalent to shortening the distance required for metal foreign objects to move out of the coverage area, and it is easier to clean up the metal foreign objects in the coverage area of the alternating magnetic field.

The spray head assembly 300 of the present embodiment also includes:

fluid inlet 330 for receiving fluid to be sprayed;

The nozzle main body 310 extends in an arc shape on the outer periphery of the cylinder bottom 120 of the outer cylinder 100 , is connected to the cylinder bottom 120 of the outer cylinder 100 , and has a communication channel connecting the fluid inlet 330 and the plurality of nozzles 320 inside.

The fluid inlet 330 is connected to the multiple nozzles 320 through the nozzle main body 310 and connected together, so that the fluid can enter the fluid inlet 330 along the way, and then spray out from the multiple nozzles 320 through the communication channel in the nozzle body 310 at the same time. A plurality of pipelines are set for conveying fluid, which simplifies the structure of the cleaning device and saves installation space. At the same time, the nozzle assembly 300 has an integrated structure, which is convenient for assembly with the outer cylinder 100 and is easy to operate.

Specifically, the fluid inlet 330 extends from the nozzle main body 310 to the outside of the bottom 120 of the outer cylinder 100 , and its extension direction is parallel to the axis of the outer cylinder 100 . The nozzle 320 sprays fluid in a direction close to the axial direction of the outer cylinder 100 to clean the inside of the outer cylinder 100, and the extension direction of the fluid inlet 330 is set to be basically the same as the injection direction of the nozzle 320, so that the fluid flows more smoothly in the nozzle assembly 300, which can It is ensured that the fluid has relatively high pressure when it is ejected from the nozzle 320 , so that sufficient impact force can be generated on the metal foreign matter in the outer cylinder 100 to realize the cleaning of the metal foreign matter.

Preferably, the fluid inlet 330 is disposed in the middle of the spray head body 310 . A plurality of nozzles 320 on the nozzle assembly 300 are evenly distributed on the nozzle body 310 along the circumference of the cylinder bottom 120, and are symmetrically distributed relative to the fluid inlet 330, and the fluid pressures ejected by the two symmetrical nozzles 320 are basically the same. The cleaning effect inside the outer cylinder 100 is more uniform and effective.

This embodiment also provides a control method for the drum washing machine described above. The drum washing machine controls the cleaning device to spray fluid to the inner wall of the outer tub 100 to clean the inner surface of the covered area.

Specifically, in this embodiment, the front-loading washing machine can control the cleaning device to spray fluid before starting the washing program, so as to remove the metal foreign matter that may remain in the outer tub 100 before starting the laundry, and avoid the electromagnetic heating device 400 from turning on the heating during the washing process. Washing water will cause residual metal foreign matter to generate heat and damage the outer cylinder 100 or the electromagnetic heating device 400 .

Alternatively, the drum washing machine controls the cleaning device to spray fluid after the washing program ends. After the washing machine is finished each time, the drum washing machine cleans the inner surface of the covered area through the cleaning device, and removes the metal foreign matter that may remain in the outer cylinder 100 during this washing process, so as to prevent electromagnetic heating when the washing water is heated next time. The device 400 acts on the metal foreign object, causing the metal foreign object to generate heat and damage the outer cylinder 100 or the electromagnetic heating device 400 .

Alternatively, the drum washing machine can also control the spraying fluid of the cleaning device before the laundry program is started and after the laundry program is finished, to further ensure that before the electromagnetic heating device 400 is started each time, the metal foreign objects located in the coverage area of the alternating magnetic field generated by it can be removed. Get rid of it completely.

In the preferred solution of this embodiment, after the drum washing machine receives the signal to start the laundry program, if it is judged that the washing water heating function is turned on, the cleaning device is controlled to spray fluid to clean the inner surface of the covered area;

After cleaning, control the electromagnetic heating device 400 to start heating.

If it is judged that the washing water heating function is not turned on for the current washing program, the drum washing machine will directly operate according to the set washing program.

Specifically, the operation of the cleaning device spraying fluid to clean the inner wall of the tub 100 can be performed simultaneously with the water inlet operation of the washing program, thereby saving the running time of the washing program. The cleaning device stops spraying fluid after the preset working time. At this time, if the washing machine has completed water intake, or at least reaches the lowest heatable water level, the electromagnetic heating device 400 can be directly started to start heating. If the washing machine has not reached the lowest heatable water level After continuing to feed water to the minimum heatable water level, start the electromagnetic heating device 400 to start heating.

In the above scheme, only when the electromagnetic heating device 400 needs to be turned on in the laundry program of the washing machine running this time, the cleaning device is controlled to spray fluid, and when the washing water is not heated this time, the cleaning device does not work, which can reduce the unnecessary cleaning of the cleaning device. working frequency.

In another preferred solution of this embodiment, the drum washing machine can also receive a cleaning instruction manually triggered by the user, and control the cleaning device to spray fluid.

Specifically, the drum washing machine controls the cleaning device to spray fluid after each washing procedure to clean the inside of the outer tub 100 and remove the metal foreign matter remaining in the action area of the electromagnetic heating device 400 . When necessary, the user can also autonomously send a cleaning instruction to the drum washing machine, for example, triggering a button corresponding to the cleaning function provided on the drum washing machine, so as to control the cleaning device to spray fluid.

During the maintenance process of the drum washing machine, metal foreign objects may fall into the inner side of the tub 100 . The drum washing machine only cleans the outer cylinder 100 through the cleaning device after each washing program, and cannot remove metal foreign objects that fall into the outer cylinder 100 during maintenance. If it is turned on, the remaining metal foreign matter may heat up and damage the outer cylinder 100 . By setting the drum washing machine to receive the cleaning instructions issued by the user, the user can manually control the work of the cleaning device after completing the product maintenance, and clean the outer cylinder 100 by spraying fluid to remove possible metal foreign objects. When the drum washing machine runs the laundry program next time, the situation that the electromagnetic heating device 400 causes the metal foreign objects in the outer cylinder 100 to heat up spontaneously can be avoided, and the working process of the drum washing machine is more reliable.

In a further solution of this embodiment, when the cleaning device sprays fluid to the covered area, the drum washing machine also controls the inner cylinder 200 to rotate in the outer cylinder 100, so that the fluid ejected from the spout 320 can be stirred by the rotation of the inner cylinder 200, further strengthening Its scouring effect on metal foreign matter improves the removal efficiency of metal foreign matter.

The inner tub 200 of this embodiment can hold water independently during the washing and rinsing processes. Specifically, the inner cylinder 200 is provided with a centrifugal drainage structure, and the centrifugal drainage structure closes the drainage hole 201 on the inner cylinder 200 during the washing and rinsing process, so that the inner cylinder 200 can hold water independently. When draining water, by controlling the inner cylinder 200 to rotate at a speed of _drainage speed V or higher, the centrifugal drainage structure can open the drainage hole 201 for drainage under the action of centrifugal force.

In a preferred solution of this embodiment, when the cleaning device sprays fluid to the covered area, the drum washing machine also controls the inner tub 200 to drain water to the outer tub 100 . Specifically, when the cleaning device sprays fluid, the _front -loading washing machine controls the inner tub 200 to rotate in the outer tub 100 at a speed greater than or equal to the drainage speed Vrow, and drains water into the outer tub 100 .

While the cleaning device is spraying fluid, the inner cylinder 200 is controlled to drain outwards. The drainage water flow of the inner cylinder 200 interacts with the fluid sprayed by the cleaning device, and jointly impacts the metal foreign objects in the coverage area of the alternating magnetic field, further improving the quality of the metal. Foreign matter removal efficiency.

The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Anyone familiar with the technology of this patent Without departing from the scope of the technical solution of the present invention, personnel can use the technical content of the above prompts to make some changes or modify them into equivalent embodiments with equivalent changes. In essence, 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 (10)

1. A drum washing machine, comprising:

   Outer cylinder,

   an inner cylinder, arranged inside the outer cylinder, at least partially made of a metal material capable of generating eddy currents in an alternating magnetic field;

   An electromagnetic heating device, installed on the outer cylinder, generates an alternating magnetic field radiating to the outer circumference to heat the inner cylinder, and the alternating magnetic field forms a coverage area on the outer cylinder;

   It is characterized in that it also includes a cleaning device for spraying fluid on the inner surface of the covering area on the outer cylinder.
2. The drum washing machine according to claim 1, wherein the cleaning device comprises a spray head assembly, the spray head assembly has a nozzle for spraying fluid; and the nozzle is arranged towards the inner surface of the covering area.
3. The drum washing machine according to claim 2, wherein the electromagnetic heating device is installed on the wall of the outer cylinder, and the coverage area includes at least the projection area of the electromagnetic heating device on the wall of the outer cylinder; the nozzle set towards the inner surface of the projected area on the cylinder wall;

   Preferably, the electromagnetic heating device is installed at the bottom area of the cylinder wall;

   More preferably, the electromagnetic heating device is installed outside the cylinder wall.
4. The drum washing machine according to claim 3, characterized in that, the inner surface of the covered area is arranged obliquely downward along the direction of fluid injection;

   Preferably, the nozzle ejects fluid from the bottom of the outer cylinder to the mouth of the cylinder, and the wall of the outer cylinder is a tapered surface structure whose diameter gradually increases from the bottom of the cylinder to the mouth of the cylinder.
5. The drum washing machine according to claim 3 or 4, wherein the covered area is located on the cylinder wall near the bottom of the cylinder, the nozzle assembly is installed on the bottom of the outer cylinder, Inner surface spray fluid;

   Preferably, the spray head assembly is installed on the outer periphery of the bottom of the cylinder, the nozzle passes through the bottom of the outer cylinder and is installed inside the outer cylinder, and the outer periphery of the nozzle is attached to the inner part of the cylinder wall of the outer cylinder.
6. The drum washing machine according to claim 5, wherein the covering area has a certain extension length on the wall of the outer cylinder along the circumferential direction of the outer cylinder, and the spray head assembly has a plurality of nozzles, and The connecting line forms a circular arc with the same center as the bottom of the outer cylinder;

   Preferably, the spray head assembly also includes:

   a fluid inlet for receiving fluid to be sprayed;

   The main body of the nozzle extends in an arc shape and is arranged on the outer periphery of the bottom of the outer cylinder, is connected with the bottom of the outer cylinder, and has a communication channel connecting the fluid inlet and a plurality of nozzles inside.
7. The drum washing machine according to any one of claims 2-6, characterized in that the cleaning device further comprises an air pump for supplying air, the air pump communicates with the nozzle assembly, and the nozzle opens toward the inner surface of the covered area Air jet for cleaning;

   Alternatively, the cleaning device further includes a cleaning pipeline, the water inlet end of the cleaning pipeline receives external water, the water outlet end of the cleaning pipeline communicates with the nozzle assembly, and the nozzle sprays water to the inner surface of the covered area for cleaning .
8. A control method for a drum washing machine according to any one of claims 1-7, characterized in that the drum washing machine controls the cleaning device to spray fluid to the inner wall of the outer drum to clean the inner surface of the covered area.
9. The control method of the drum washing machine according to claim 8, wherein the drum washing machine controls the cleaning device to spray fluid before the washing program is started and/or after the washing program is finished;

   Preferably, after the drum washing machine receives the signal to start the laundry program, if it is judged that the washing water heating function is turned on, the cleaning device is controlled to spray fluid to clean the inner surface of the covered area;

   After cleaning, control the electromagnetic heating device to start heating.
10. The control method of the drum washing machine according to claim 8 or 9, characterized in that, when the cleaning device sprays the fluid, the drum washing machine controls the inner drum to rotate in the outer drum;

    Preferably, when the cleaning device sprays fluid, the drum washing machine also controls the inner cylinder to drain water to the outer cylinder.

Images