CN112522904A

CN112522904A - Washing water heating method for drum washing machine

Info

Publication number: CN112522904A
Application number: CN202011294828.4A
Authority: CN
Inventors: 颜灵智; 王开明; 谢红伟
Original assignee: Qingdao Haier Drum Washing Machine Co Ltd; Haier Smart Home Co Ltd
Current assignee: Qingdao Haier Drum Washing Machine Co Ltd; Haier Smart Home Co Ltd
Priority date: 2020-11-18
Filing date: 2020-11-18
Publication date: 2021-03-19

Abstract

The invention belongs to the technical field of washing equipment, and particularly provides a washing water heating method of a drum washing machine, which comprises the following steps: a box body; the fixing device is arranged in the box body; a metal cylinder rotatably disposed within the fixture; the electromagnetic heating device can heat the metal cylinder to improve the temperature of the washing water in the metal cylinder; the washing water heating method comprises the following steps: obtaining a target heating temperature of the washing water in the metal cylinder; comparing the target heating temperature with a preset temperature; and selecting a corresponding heating program to heat the washing water in the metal cylinder according to the comparison result. Through the urceolus that cancels washing machine, only remain a metal drum, only need wash the inside of metal drum, it is very convenient, can directly heat the metal drum through electromagnetic heating device to improve the temperature of the washing water in the metal drum, heating efficiency is high, through setting up washing water heating method, makes washing machine more intelligent.

Description

Washing water heating method for drum washing machine

Technical Field

The invention belongs to the technical field of washing equipment, and particularly provides a washing water heating method of a drum washing machine.

Background

A washing machine is a cleaning appliance that washes laundry using mechanical action generated by electric energy. The current washing machines mainly include a pulsator type washing machine and a drum type washing machine.

The existing drum washing machine mainly comprises a box body, an outer drum, an inner drum and a driving device, wherein the outer drum, the inner drum and the driving device are arranged in the box body, the inner drum is rotatably arranged in the outer drum, and the driving device can drive the inner drum to rotate. After the use for a period of time, on the outer wall of inner tube and the inner wall of urceolus, can bond there are a lot of impurity, under airtight moist environment, easily breed the bacterium, influence user's healthy. Therefore, the washing machine needs to be cleaned periodically.

However, for the drum washing machine, professional after-sales personnel are needed to clean the drum washing machine more thoroughly, and the ordinary consumers cannot complete the cleaning work well. Because the inner and outer drums of the drum washing machine cannot be easily disassembled by people during design, the inner and outer drums cannot be thoroughly cleaned.

Therefore, there is a need in the art for a new solution to the above problems.

Disclosure of Invention

In order to solve the above problems in the prior art, that is, to solve the problem of inconvenient cleaning of the existing drum washing machine, the present invention provides a method for heating washing water of a drum washing machine, the drum washing machine includes a cabinet, and the drum washing machine further includes: a fixing device disposed within the case; a metal drum rotatably disposed in the fixing device for containing articles to be washed and washing water; the electromagnetic heating device is arranged on the fixing device and can heat the metal cylinder so as to increase the temperature of the washing water in the metal cylinder; the washing water heating method includes: s1: acquiring a target heating temperature of the washing water in the metal cylinder; s2: comparing the target heating temperature with a preset temperature; s3: and selecting a corresponding heating program to heat the washing water in the metal cylinder according to the comparison result.

In a preferred embodiment of the above washing water heating method, step S3 specifically includes: s31: if the target heating temperature is lower than the preset temperature, selecting a first heating program to heat the washing water in the metal cylinder; s32: if the target heating temperature is not less than the preset temperature, selecting a second heating program to heat the washing water in the metal cylinder; wherein the control accuracy of the first heating program is higher than the control accuracy of the second heating program.

In a preferred embodiment of the above washing water heating method, the total amount of the washing water in the metal cylinder is obtained before the first heating process or the second heating process is performed; comparing the total amount with a preset water amount; if the total amount is less than the preset water amount, acquiring the current temperature of the washing water in the metal cylinder in the process of executing the first heating program or the second heating program; selectively adjusting the heating intensity of the electromagnetic heating device according to the current temperature and the target heating temperature; if the total amount is not less than the preset water amount, selectively adjusting the heating intensity of the electromagnetic heating device according to the heating time of the electromagnetic heating device in the process of executing the first heating program or the second heating program.

In a preferred embodiment of the above washing water heating method, during the execution of the first heating program or the second heating program, a current temperature of the washing water in the metal cylinder is obtained; selectively adjusting the heating intensity of the electromagnetic heating device according to the current temperature and the target heating temperature.

In a preferred embodiment of the above washing water heating method, the step of "selectively adjusting the heating intensity of the electromagnetic heating device according to the current temperature and the target heating temperature" specifically includes: selectively adjusting the heating intensity of the electromagnetic heating device according to the difference value between the target heating temperature and the current temperature.

In a preferred embodiment of the above washing water heating method, the electromagnetic heating device includes a low range, a medium range and a high range according to a heating intensity from low to high, and the step of "selectively adjusting the heating intensity of the electromagnetic heating device according to a difference between the target heating temperature and the current temperature" during the execution of the first heating program specifically includes: s310: enabling the electromagnetic heating device to adopt the high grade to heat the washing water in the metal cylinder; s311: when the difference value between the target heating temperature and the current temperature reaches a first preset value, enabling the electromagnetic heating device to heat the washing water in the metal cylinder by adopting the middle gear; s312: when the difference value between the target heating temperature and the current temperature reaches a second preset value, enabling the electromagnetic heating device to heat the washing water in the metal cylinder by adopting the low gear until the temperature of the washing water in the metal cylinder reaches the target heating temperature; in the process of executing the second heating program, the step of selectively adjusting the heating intensity of the electromagnetic heating device according to the difference between the target heating temperature and the current temperature specifically includes: s320: enabling the electromagnetic heating device to adopt the high grade to heat the washing water in the metal cylinder; s321: when the difference value between the target heating temperature and the current temperature reaches the first preset value, enabling the electromagnetic heating device to heat the washing water in the metal cylinder by adopting the middle gear until the temperature of the washing water in the metal cylinder reaches the target heating temperature; wherein the first preset value is greater than the second preset value.

In a preferred embodiment of the above washing water heating method, the electromagnetic heating device includes a first gear, a second gear, a third gear, a fourth gear and a fifth gear according to a heating intensity from low to high, and the step of "selectively adjusting the heating intensity of the electromagnetic heating device according to a difference between the target heating temperature and the current temperature" during the execution of the first heating program specifically includes: s310: enabling the electromagnetic heating device to heat the washing water in the metal cylinder by adopting the fifth gear; s311: when the difference value between the target heating temperature and the current temperature reaches a first preset value, enabling the electromagnetic heating device to heat the washing water in the metal cylinder by adopting the fourth gear; s312: when the difference value between the target heating temperature and the current temperature reaches a second preset value, enabling the electromagnetic heating device to heat the washing water in the metal cylinder by adopting the third gear; s313: when the difference value between the target heating temperature and the current temperature reaches a third preset value, enabling the electromagnetic heating device to heat the washing water in the metal cylinder by adopting the second gear; s314: when the difference value between the target heating temperature and the current temperature reaches a fourth preset value, enabling the electromagnetic heating device to heat the washing water in the metal cylinder by adopting the first gear until the temperature of the washing water in the metal cylinder reaches the target heating temperature; in the process of executing the second heating program, the step of selectively adjusting the heating intensity of the electromagnetic heating device according to the difference between the target heating temperature and the current temperature specifically includes: s320: enabling the electromagnetic heating device to heat the washing water in the metal cylinder by adopting the fifth gear; s321: when the difference value between the target heating temperature and the current temperature reaches the first preset value, enabling the electromagnetic heating device to heat the washing water in the metal cylinder by adopting the fourth gear; s322: when the difference value between the target heating temperature and the current temperature reaches the third preset value, enabling the electromagnetic heating device to heat the washing water in the metal cylinder by adopting the third gear until the temperature of the washing water in the metal cylinder reaches the target heating temperature; the first preset value is larger than the second preset value, the second preset value is larger than the third preset value, and the third preset value is larger than the fourth preset value.

In a preferred embodiment of the above washing water heating method, the heating intensity of the electromagnetic heating device is selectively adjusted according to the heating time of the electromagnetic heating device during the execution of the first heating process or the second heating process.

In a preferred embodiment of the above washing water heating method, the electromagnetic heating device includes a low stage, a medium stage and a high stage according to a heating intensity from low to high, and the step of "selectively adjusting the heating intensity of the electromagnetic heating device according to a heating time of the electromagnetic heating device" during the execution of the first heating program specifically includes: s310: enabling the electromagnetic heating device to adopt the high grade to heat the washing water in the metal cylinder; s311: when the heating time of the electromagnetic heating device reaches a first preset time, the electromagnetic heating device heats the washing water in the metal cylinder by adopting the middle gear; s312: when the heating time of the electromagnetic heating device reaches a second preset time, the electromagnetic heating device heats the washing water in the metal cylinder by adopting the low gear until the temperature of the washing water in the metal cylinder reaches the target heating temperature; in the process of executing the second heating program, the step of selectively adjusting the heating intensity of the electromagnetic heating device according to the heating time of the electromagnetic heating device specifically includes: s320: enabling the electromagnetic heating device to adopt the high grade to heat the washing water in the metal cylinder; s321: when the heating time of the electromagnetic heating device reaches the first preset time, the electromagnetic heating device heats the washing water in the metal cylinder by adopting the middle gear until the temperature of the washing water in the metal cylinder reaches the target heating temperature; wherein the first preset time is less than the second preset time.

In a preferred embodiment of the above washing water heating method, the electromagnetic heating device includes a first gear, a second gear, a third gear, a fourth gear and a fifth gear according to a heating intensity from low to high, and the step of "selectively adjusting the heating intensity of the electromagnetic heating device according to a heating time of the electromagnetic heating device" during the execution of the first heating program specifically includes: s310: enabling the electromagnetic heating device to heat the washing water in the metal cylinder by adopting the fifth gear; s311: when the heating time of the electromagnetic heating device reaches a first preset time, the electromagnetic heating device heats the washing water in the metal cylinder by adopting the fourth gear; s312: when the heating time of the electromagnetic heating device reaches second preset time, the electromagnetic heating device heats the washing water in the metal cylinder by adopting the third gear; s313: when the heating time of the electromagnetic heating device reaches a third preset time, the electromagnetic heating device heats the washing water in the metal cylinder by adopting the second gear; s314: when the heating time of the electromagnetic heating device reaches a fourth preset time, the electromagnetic heating device heats the washing water in the metal cylinder by adopting the first gear until the temperature of the washing water in the metal cylinder reaches the target heating temperature; in the process of executing the second heating program, the step of selectively adjusting the heating intensity of the electromagnetic heating device according to the heating time of the electromagnetic heating device specifically includes: s320: enabling the electromagnetic heating device to heat the washing water in the metal cylinder by adopting the fifth gear; s321: when the heating time of the electromagnetic heating device reaches the first preset time, the electromagnetic heating device heats the washing water in the metal cylinder by adopting the fourth gear; s322: when the heating time of the electromagnetic heating device reaches the third preset time, enabling the electromagnetic heating device to heat the washing water in the metal cylinder by adopting the third gear until the temperature of the washing water in the metal cylinder reaches the target heating temperature; the first preset time is less than the second preset time, the second preset time is less than the third preset time, and the third preset time is less than the fourth preset time.

It can be understood by those skilled in the art that in the preferred technical solution of the present invention, the drum washing machine has no outer cylinder, only one metal cylinder for accommodating the articles to be washed and the washing water, therefore, only the interior of the metal cylinder needs to be cleaned, which is very convenient, and the washing machine is further provided with an electromagnetic heating device, which can directly heat the metal cylinder to increase the temperature of the washing water in the metal cylinder, which has high heating efficiency.

Further, the heating method further comprises; if the target heating temperature is lower than the preset temperature, a first heating procedure is selected to heat the washing water in the metal cylinder; if the target heating temperature is not less than the preset temperature, selecting a second heating program to heat the washing water in the metal cylinder; wherein the control accuracy of the first heating program is higher than the control accuracy of the second heating program. Through the arrangement, when the target heating temperature is lower than the preset temperature, the clothes to be washed can not bear high temperature, and under the condition, the first heating program with high control precision is adopted, so that the temperature of the washing water can be more accurately controlled, and the clothes are prevented from being damaged due to overhigh water temperature; on the contrary, when the target heating temperature is not less than the preset temperature, the clothes to be washed can bear high temperature, and in this situation, the second heating program with slightly low control precision is adopted, so that the heating process can be simplified, and the heating efficiency is improved.

Further, the heating method further includes: acquiring the total amount of the washing water in the metal cylinder before the first heating program or the second heating program is executed; comparing the total amount with a preset water amount; if the total amount is less than the preset water amount, acquiring the current temperature of the washing water in the metal cylinder in the process of executing the first heating program or the second heating program; selectively adjusting the heating intensity of the electromagnetic heating device according to the current temperature and the target heating temperature; and if the total amount is not less than the preset water amount, selectively adjusting the heating intensity of the electromagnetic heating device according to the heating time of the electromagnetic heating device in the process of executing the first heating program or the second heating program. Through the arrangement, before the heating program is executed, the total amount of the washing water is obtained, when the total amount of the washing water is smaller than the preset water amount, the washing water is less, if the heating intensity of the electromagnetic heating component is adjusted according to the heating time in the heating process, the control difficulty is higher, and the water temperature is easily higher; on the contrary, when the total amount of the washing water is not less than the preset water amount, the washing water is more, and in this case, the heating intensity of the electromagnetic heating device is adjusted according to the heating time, so that the control is simpler and more convenient.

Drawings

Preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:

FIG. 1 is a first schematic structural diagram of a drum washing machine according to the present invention;

FIG. 2 is a second schematic structural view of the drum washing machine of the present invention;

FIG. 3 is a third schematic structural view of the drum washing machine of the present invention;

FIG. 4 is a schematic structural view of a fixing device of the drum washing machine according to the present invention;

fig. 5 is a schematic structural view of a washing tub of the drum washing machine of the present invention;

FIG. 6 is an assembly view of a first water pipe and a water collecting member of the drum washing machine according to the present invention;

FIG. 7 is a schematic structural view of a water collecting member of the drum washing machine according to the present invention;

FIG. 8 is an assembly view of the spindle, the tubular structure and the adaptor of the drum washing machine of the present invention;

fig. 9 is a structural schematic view of a coupling member of the drum washing machine of the present invention;

FIG. 10 is a first schematic view of the assembly of the washing tub and the electromagnetic heating device of the drum washing machine of the present invention;

FIG. 11 is a second schematic view of the assembly of the washing tub and the electromagnetic heating device of the drum washing machine of the present invention;

FIG. 12 is a flow chart of a washing water heating method of the drum washing machine of the present invention;

fig. 13 is a flowchart of an embodiment of a washing water heating method of a drum washing machine according to the present invention.

Detailed Description

Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that the following embodiments are merely illustrative of the technical principles of the present invention, and are not intended to limit the scope of the present invention.

It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the drawings, which are for convenience of description only, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

As shown in fig. 1 to 3, the drum washing machine of the present invention includes a cabinet 1, and a fixing device, a washing tub 2, a driving device, a water inlet and outlet device, and a vibration damping device are provided in the cabinet 1.

With continued reference to fig. 1 to 3, the washing tub 2 is used to contain the items to be washed and the washing water, and a laundry input opening 211 is formed at a front end (a left end of the washing tub 2 as viewed in fig. 1) of the washing tub 2. The washing drum 2 is rotatably disposed in the fixing device, and the driving device is drivingly connected to a rear end (a right end of the washing drum 2 as viewed in fig. 1) of the washing drum 2, and the driving device can drive the washing drum 2 to rotate when the washing machine is operated. Wherein, the rear end of the washing drum 2 has a rotating shaft 22, the washing drum 2 is rotatably connected with the fixing device through the rotating shaft 22, exemplarily, the driving device includes a first motor 31, a belt 32 and a belt pulley 33, wherein the belt pulley 33 is fixedly connected with the rotating shaft 22, one end of the belt 32 is connected with an output shaft of the first motor 31, a small belt pulley is generally installed on the output shaft of the first motor 31, one end of the belt 32 is connected with the small belt pulley, the other end of the belt 32 is connected with the belt pulley 33 installed on the rotating shaft 22, and the first motor 31 drives the belt pulley 33 and the rotating shaft 22 to rotate through the belt 32. It should be noted that the driving device is not limited to the specific example described above, for example, a direct drive motor may be used for driving, a stator device of the direct drive motor may be mounted on the fixing device, and a rotor of the direct drive motor may be mounted on the rotating shaft 22, and such modifications and changes to the specific structural form of the driving device should be limited within the protection scope of the present invention without departing from the principle and scope of the present invention. The water inlet and outlet device is communicated with the rear end of the washing drum 2, and water can be supplied into the washing drum 2 or the water in the washing drum 2 can be discharged through the water inlet and outlet device.

Referring to fig. 1 to 3, the vibration damping device is disposed between the fixing device and the cabinet 1, and damps vibration by the vibration damping device to reduce vibration noise of the washing machine. The vibration damping device comprises a hanging spring 41 and a damper 42, the top of the fixing device is fixedly connected with the box body 1 through the hanging spring 41, and the bottom of the fixing device is fixedly connected with the box body 1 through the damper 42.

As shown in fig. 1 to 4, the fixing device includes a main frame 51, the washing tub 2 is rotatably disposed in the main frame 51, and the rotation shaft 22 is rotatably connected to a rear end (a right end of the main frame 51 as viewed in fig. 1) of the main frame 51. A support structure is provided at the rear end of the main frame 51, to which the rotation shaft 22 is rotatably connected. Wherein the support structure is a cylindrical structure 511.

With continued reference to fig. 2 and 4, the fixing device further comprises a plurality of rollers 52 disposed on the main frame 51, wherein the plurality of rollers 52 abut against the outer wall of the washing tub 2 when installed. Exemplarily, the main frame 51 includes 4 cross beams 512 arranged along the axial direction of the washing drum 2, one roller 52 is installed on each cross beam 512, and the roller 52 is disposed near the front end of the main frame 51, and the roller 52 is disposed to support the front end of the washing drum 2, so that the pressure of the rear end of the washing drum 2 on the rotating shaft 22 can be greatly reduced, thereby not only reducing the design difficulty and the processing cost of the rotating shaft 22, but also prolonging the service life of the rotating shaft 22. The main frame 51 includes two accommodation areas, which are disposed in a vertical direction, denoted as an upper accommodation area 513 and a lower accommodation area 514, wherein the washing drum 2 is located in the upper accommodation area 513.

As shown in fig. 5, a water passing structure is formed at the rear end of the washing tub 2, and the water inlet and outlet means communicates with the water passing structure, so that water can be supplied into the washing tub 2 or water in the washing tub 2 can be discharged through the water passing structure. Preferably, the water passing structure is a water passing port 212 formed at a boundary of the rear wall and the inner wall of the washing tub 2. The water opening 212 is provided at the boundary between the rear wall and the inner cylindrical wall, which is more advantageous for discharging the water in the washing tub 2. The inner diameter of the front end of the washing drum 2 is smaller than the inner diameter of the rear end of the washing drum 2. With this arrangement, the water in the washing tub 2 can be more easily flowed to the water passage opening 212. A water collecting ring 213 is formed on the inner wall of the washing tub 2, and the water collecting ring 213 communicates with the water inlet 212. As can be seen from the figure, the water collecting ring 213 is a circular groove-shaped structure protruding outward from the inner wall of the washing drum 2 along the radial direction of the washing drum 2, so that the bottom of the water collecting ring 213 is lower than the inner wall of the washing drum 2, and thus, the water in the washing drum 2 is collected to the water collecting ring 213, which is beneficial to discharging the water in the washing drum 2.

As shown in fig. 1, 3, 6 and 8, the water inlet and drain device includes a first water inlet and drain assembly, an adaptor and a second water inlet and drain assembly which are sequentially communicated, wherein the first water inlet and drain assembly is communicated with a water passage port 212 formed at the rear end of the washing drum 2, that is, the first water inlet and drain assembly does not need to extend into the washing drum 2, the second water inlet and drain assembly is communicated with the outside, and the adaptor is installed on the cylindrical structure 511. When the washing cylinder 2 rotates, the first water inlet and drainage assembly and the part of the adaptor connected with the first water inlet and drainage assembly can rotate along with the washing cylinder 2, and the second water inlet and drainage assembly and the part of the adaptor connected with the second water inlet and drainage assembly are fixed.

The adaptor is preferably configured as a rotary tee joint 64, the rotary tee joint 64 includes two rotary ports 641 and two fixed ports 642, wherein the rotary ports 641 are communicated with the first water inlet and outlet assembly and can rotate along with the first water inlet and outlet assembly, the second water inlet and outlet assembly includes a water inlet pipe 65 and a water outlet pipe 66, one of the two fixed ports 642 is a water inlet and is communicated with the water inlet pipe 65, the other end of the water inlet pipe 65 is connected with an external water supply source, the other fixed port 642 is a water outlet and is communicated with the water outlet pipe 66, and the other end of the water outlet pipe 66 is connected with a drain pump 67.

With continued reference to fig. 5 to 8, the first water inlet and outlet assembly includes a first water pipe 61, a water collecting member 62 and a connecting pipe 63 which are sequentially communicated, wherein the number of the first water pipes 61 may be multiple. Illustratively, the number of the first water pipes 61 is three, and correspondingly, the number of the water through openings 212 is also 3, the three water through openings 212 are arranged along the circumferential direction of the washing drum 2, the first end of the first water pipe 61 is communicated with the corresponding water through opening 212, one end of the water collecting member 62 is provided with three water dividing openings 621, the number of the water dividing openings 621 is three, the second end of the first water pipe 61 is communicated with the corresponding water dividing openings 621, the other end of the water collecting member 62 is provided with a concentration opening (not shown), the plurality of water dividing openings 621 are all communicated with the concentration opening, and the concentration opening of the water collecting member 62 is communicated with the rotation opening 641 of the rotary tee 64 through the connecting pipe 63. Thus, the three first water pipes 61 are communicated with the swivel tee 64 through the water collecting member 62 and the connecting pipe 63.

With continued reference to fig. 8, a passage 221 is provided in the rotating shaft 22, and the first water inlet and outlet assembly is communicated with the rotating tee 64 through the passage 221 and the cylindrical structure 511. Wherein, the inner diameter of the channel 221 is larger than the outer diameter of the cylindrical structure 511, the cylindrical structure 511 is inserted into the channel 221 of the rotating shaft 22, and the two are connected through the bearing 24, so that the two can rotate relatively.

As shown in fig. 5, 8 and 9, the washing tub 2 includes a metal tub 21, a rotation shaft 22 and a connection member 23, wherein the metal tub 21 is used for accommodating articles to be washed and washing water, a laundry input port 211, a water passage port 212 and a drip ring 213 are formed on the metal tub 21, one end of the connection member 23 is connected to a rear end (a right end of the metal tub 21 as viewed in fig. 5) of the metal tub 21, and the other end of the connection member 23 is connected to the rotation shaft 22. That is, the rotating shaft 22 is fixedly connected to the metal tube 21 through the connecting member 23, the driving device drives the rotating shaft 22 to rotate, and the rotating shaft 22 drives the metal tube 21 to rotate synchronously through the connecting member 23.

The connecting member 23 includes a cylindrical body 231 and connecting arms 232 connected to each other, wherein the number of the connecting arms 232 is plural, for example, the number of the connecting arms 232 is three, the three connecting arms 232 are arranged along the circumferential direction of the cylindrical body 231, preferably, uniformly arranged along the circumferential direction of the cylindrical body 231, the connecting arms 232 and the cylindrical body 231 may be fixedly connected, or may be integrally provided, when mounting, the rotating shaft 22 may be inserted into the cylindrical body 231, and the two may be in interference fit. In the mounted state, the connecting arm 232 is fixedly connected to the rear end of the metal cylinder 21, the rotating shaft 22 is fixedly connected to the cylindrical body 231, and a certain gap is provided between the end of the rotating shaft 22 and the rear end of the metal cylinder 21, through which the second end of the first water pipe 61 can enter the passage 221 of the rotating shaft 22.

Specifically, when the water collector 62 is mounted, the water collector 62 may be fixed to the cylindrical body 231 of the connecting member 23, the water collector 62 may be positioned in the gap between the rotating shaft 22 and the metal cylinder 21, the water dividing port 621 of the water collector 62 may be directed toward the metal cylinder 21, and the concentration port of the water collector 62 may be directed toward the passage 221 of the rotating shaft 22, so that the second end of the first water pipe 61 may be directly communicated with the corresponding water dividing port 621, the connecting pipe 63 may be positioned inside the passage 221 and the cylindrical structure 511, the concentration port of the water collector 62 may be communicated with the left end of the connecting pipe 63, the rotating tee 64 may be fixed to the cylindrical structure 511, the rotating port 641 of the connecting pipe 63 may be extended into the cylindrical structure 511, the right end of the connecting pipe 63 may be communicated with the rotating port 641, and the connecting pipe 63, the water collector 62, and the first water pipe 61 may be rotated synchronously with the metal cylinder 21. The three first water pipes 61 may be supplied with water or drained at the same time. In order to prevent air leakage during draining, the washing tub 2 can be kept in a rotating state, and washing water is distributed along the water collecting ring 213 under the action of centripetal force, so that all three water passing ports 212 are immersed in the water, thereby improving the draining capability of the washing machine and reducing the washing time.

Continuing to refer to fig. 9, the three connecting arms 232 are identical in structure, taking one of the three connecting arms as an example, each connecting arm 232 includes two bars 2321 and a reinforcement 2322, wherein the number of the bars 2321 is two, the two bars 2321 are arranged in a gap, and the bars 2321 are fixedly connected with or integrally arranged with the cylindrical body 231; the number of the reinforcing members 2322 is plural, for example, the number of the reinforcing members 2322 is two, and both ends of the reinforcing members 2322 are respectively fixedly connected with the two bar members 2321 or integrally disposed.

Preferably, the drum washing machine of the present invention further comprises an air leakage preventing means for maintaining the water passage opening 212 in a communication state with the corresponding first water pipe 61 when the washing tub 2 is in a rotating state, and for maintaining the water passage opening 212 not immersed in water in a blocking state with the corresponding first water pipe 61 when the washing tub 2 is in a stationary state. When the washing machine is in a rotating state, for example, when the washing machine performs a dehydration process, the air leakage preventing device can maintain the water passing ports 212 in a communication state with the corresponding first water pipes 61, that is, the three water passing ports 212 and the corresponding first water pipes 61 in a communication state, so that the three first water pipes 61 can simultaneously discharge water, thereby improving the drainage capacity of the washing machine. In the case where the washing machine is in a stationary state, for example, between the execution of the washing process and the rinsing process, the water in the washing tub 2 needs to be drained, and at this time, the water in the washing tub 2 is entirely located at the lower portion of the washing tub 2, only the water passage ports 212 located at the bottom portion of the three water passage ports 212 are immersed in the water, and the other two water passage ports 212 are located at the upper portion and are not immersed in the water, the air leakage preventing means can maintain the two water passage ports 212 located at the upper portion (i.e., the water passage ports 212 not immersed in the water) and the corresponding first water pipes 61 in a disconnected state, and thus, after the drain pump 67 is started, the air leakage of the two first water pipes 61 can be prevented, and the smooth execution.

As shown in fig. 5, the air leakage preventing device includes a plurality of air leakage preventing units, and illustratively, the air leakage preventing device includes three air leakage preventing units, and the three air leakage preventing units may have the same structure or different structures, and of course, it is preferable that the three air leakage preventing units are provided with the same structure. The air leakage prevention unit comprises two air leakage prevention members which are matched with each other, a cavity is formed in the first air leakage prevention member, the second air leakage prevention member is located in the cavity, the top end of the cavity is communicated with the first water pipe 61, the middle position close to the cavity is communicated with the water through hole 212, the section of the cavity is a communication cavity 71 and used for communicating the first water pipe 61 and the water through hole 212, a cavity at one end below the communication cavity 71 is a containing cavity 72, the second air leakage prevention member is generally located in the containing cavity 72, the second air leakage prevention member is of a spherical structure 73, and the outer diameter of the spherical structure 73 is larger than the inner diameter of the first water pipe 61 and smaller than the inner diameter of the communication cavity 71.

When the washing tub 2 is rotated, the spherical structure 73 is always positioned in the accommodating chamber 72 by the centrifugal force, and in this case, the water passage ports 212 are in communication with the corresponding communication chamber 71 and the first water pipe 61. When the washing drum 2 stops rotating, two air leakage prevention units are positioned at the upper part, and one air leakage prevention unit is positioned at the bottom end. The spherical structure 73 of the air leakage prevention unit at the bottom end is positioned in the accommodating chamber 72 under the action of self gravity, and the water through port 212 at the bottom end (the water through port 212 is immersed in water) is communicated with the corresponding communication chamber 71 and the first water pipe 61, so that water can be drained. The spherical structure 73 of the upper air leakage preventing unit moves toward the first water pipe 61 by its own weight, and the first water pipe 61 can be sealed because the outer diameter of the spherical structure 73 is larger than the inner diameter of the first water pipe 61, and particularly, after the drain pump 67 is started, the spherical structure 73 can more tightly seal the first water pipe 61 under the suction force of the drain pump 67 to prevent the first water pipe 61 from air leakage. Of course, the outer diameter of the spherical structure 73 may be larger than the inner diameter of the communication chamber 71, so that the spherical structure 73 can directly seal the communication chamber 71, that is, indirectly seal the first water pipe 61, and also prevent the first water pipe 61 from leaking air.

It should be noted that the air leakage preventing means may include only two air leakage preventing units, one of the three water openings 212 is mainly two, the air leakage preventing unit is not provided at the main water opening 212, the air leakage preventing unit is provided only at the other two water openings 212, when the washing tub 2 stops rotating, the main water opening 212 is positioned at the bottom to drain water, and the other two water openings 212 are sealed by the air leakage preventing unit.

As shown in fig. 10 and 11, the drum washing machine of the present invention further includes an electromagnetic heating device mounted on the fixing device, and for example, the electromagnetic heating device may be mounted in the lower receiving area 514 of the main frame 51, and the metal tub 21 may be directly heated by the electromagnetic heating device to raise the temperature of the washing water in the metal tub 21. The metal cylinder 21 may be made of magnetic stainless steel.

With continued reference to fig. 10 and 11, the electromagnetic heating apparatus includes an electromagnetic heating member 81, a driving member and a transmission assembly, the electromagnetic heating member 81 is connected to the driving member through the transmission assembly, the driving member is mounted on the fixing apparatus, for example, the driving member may be mounted in the lower receiving area 514 of the main frame 51, after the electromagnetic heating member 81 is powered, the driving member may be activated, and the driving member drives the transmission assembly to move so as to drive the electromagnetic heating member 81 to reciprocate along the axial direction of the metal cylinder 21. By reciprocating the electromagnetic heating member 81 in the axial direction of the metal tube 21, the metal tube 21 can be uniformly heated, and the heating efficiency can be improved.

With continued reference to fig. 10 and fig. 11, the driving member is preferably a motor, which is denoted as a second motor 82, the transmission assembly includes a lead screw 83 and a nut 84, the lead screw 83 is in threaded engagement with the nut 84, wherein the lead screw 83 is fixedly connected with an output shaft of the second motor 82, the nut 84 is connected with the electromagnetic heating member 81, the second motor 82 can drive the lead screw 83 to rotate, and when the lead screw 83 rotates, the nut 84 can move left and right along the lead screw 83, and at the same time, the electromagnetic heating member 81 is driven to reciprocate along the axial direction of the metal cylinder 21.

The electromagnetic heating device further comprises a guide assembly, wherein the guide assembly comprises a first guide member and a second guide member, the first guide member is arranged on the fixing device, the second guide member is arranged on the electromagnetic heating member 81, and the first guide member and the second guide member are matched with each other to prevent the electromagnetic heating member 81 from shaking left and right in the moving process when the second motor 82 drives the electromagnetic heating member 81 to move back and forth. Through the arrangement, the electromagnetic heating component 81 is more stable in the reciprocating movement process, and the heating efficiency is improved.

With continuing reference to fig. 10 and 11, the first guide member includes two support plates 85 disposed oppositely, the two support plates 85 are disposed oppositely from left to right when viewed from fig. 11, each support plate 85 is provided with a guide groove 851, the guide groove 851 extends along the length direction of the metal cylinder 21, the second guide member includes a guide rod 86 and a connecting rod 87, the guide rod 86 is fixedly connected with the electromagnetic heating member 81 through the connecting rod 87, when the electromagnetic heating member 81 is installed, the guide rod 86 is disposed between the two support plates 85, and two ends of the guide rod 86 are respectively located in the guide grooves 851 disposed on the two support plates 85, the guide rod 86 is adapted to the guide grooves 851, and during the reciprocating movement of the electromagnetic heating member 81, the two ends of the guide rod 86 slide along the guide grooves 851, so as to prevent the electromagnetic heating member 81 from shaking from left to right.

It should be noted that, in practical applications, a person skilled in the art may also set the first guide member and the second guide member to other structural forms, for example, the first guide member includes two horizontal guide rods, which are arranged side by side from left to right, the second guide member is set to a vertical plate-shaped member, which is provided with two guide holes, which correspond to the two guide rods, respectively, and so on, and such adjustment and change to the specific structural forms of the first guide member and the second guide member do not depart from the principle and scope of the present invention, and should be limited within the protection scope of the present invention.

With continued reference to fig. 10, the number of the guide rods 86 and the connecting rods 87 is two, the guide rods 86 correspond to the connecting rods 87 one by one, the guide rods 86 are connected to the electromagnetic heating member 81 through the corresponding connecting rods 87, and the two guide rods 86 are arranged back and forth along the length direction of the metal cylinder 21. The stability of the electromagnetic heating component 81 in the reciprocating process can be further improved through the common guidance of the two guide rods 86 arranged in the front and the back.

With reference to fig. 10, the guide groove 851 is inclined downward in a direction from the front end of the metal cylinder 21 toward the rear end of the metal cylinder 21, and the guide groove 851 is inclined downward in the right direction as viewed in the drawing, so that the distance between the electromagnetic heating member 81 and the outer cylinder wall of the metal cylinder 21 is kept constant during the reciprocating movement, which is advantageous for improving the heating efficiency.

A horizontal plate-shaped member 88 can be arranged between the two connecting rods 87, a through hole is formed in the plate-shaped member 88, a vertical rod-shaped member 89 is arranged on the nut 84, the top end of the rod-shaped member 89 penetrates through the through hole, and the rod-shaped member 89 can freely move up and down in the through hole, so that the electromagnetic heating member 81 can be driven to move back and forth by the vertical rod-shaped member 89, and the electromagnetic heating member 81 can be allowed to move up and down.

Based on the above drum washing machine, the present invention also provides a washing water heating method, as shown in fig. 12, the washing water heating method comprising the steps of: s1: obtaining a target heating temperature of the washing water in the metal cylinder; s2: comparing the target heating temperature with a preset temperature; s3: and selecting a corresponding heating program to heat the washing water in the metal cylinder according to the comparison result. Before the washing machine leaves a factory, a plurality of heating programs can be prestored in the washing machine, the heating programs correspond to the target heating temperature of the washing water, before heating, the target heating temperature of the washing water is obtained, then the corresponding heating program is selected according to the target temperature, and through the setting, the washing machine is more intelligent.

As shown in fig. 13, step S3 specifically includes: s31: if the target heating temperature is lower than the preset temperature, a first heating procedure is selected to heat the washing water in the metal cylinder; s32: if the target heating temperature is not less than the preset temperature, selecting a second heating program to heat the washing water in the metal cylinder; wherein the control accuracy of the first heating program is better than the control accuracy of the second heating program.

That is, two heating programs are pre-stored in the washing machine, when the target heating temperature is lower than the preset temperature, it is indicated that the clothes to be washed can not bear high temperature, and in this situation, the first heating program with high control precision is adopted, so that the temperature of the washing water can be more accurately controlled, and the clothes are prevented from being damaged due to overhigh water temperature; on the contrary, when the target heating temperature is greater than or equal to the preset temperature, the clothes to be washed can bear high temperature, and in this situation, the second heating program with slightly low control precision is adopted, so that the heating process can be simplified, and the heating efficiency is improved.

In the course of performing the first heating process or the second heating process, the heating intensity of the electromagnetic heating device may be adjusted according to the real-time temperature of the washing water and the target heating temperature, or may be adjusted according to the heating time.

Preferably, before the first heating process or the second heating process is performed, the total amount of the washing water in the metal drum is acquired; comparing the total amount with a preset water amount; if the total amount is less than the preset water amount, acquiring the current temperature of the washing water in the metal cylinder in the process of executing the first heating program or the second heating program; selectively adjusting the heating intensity of the electromagnetic heating device according to the current temperature and the target heating temperature; and if the total amount is not less than the preset water amount, selectively adjusting the heating intensity of the electromagnetic heating device according to the heating time of the electromagnetic heating device in the process of executing the first heating program or the second heating program.

That is, before the heating program is executed, the total amount of the washing water is obtained, when the total amount of the washing water is smaller than the preset amount of water, it indicates that the washing water is less, if the heating intensity of the electromagnetic heating component is adjusted according to the heating time in the heating process, the control difficulty is higher, and the water temperature is easily higher, in this case, the heating intensity of the electromagnetic heating device is preferably adjusted according to the real-time temperature of the washing water and the target heating temperature, and the control is more accurate; on the contrary, when the total amount of the washing water is more than or equal to the preset water amount, the washing water is more, and in this case, the heating intensity of the electromagnetic heating device is adjusted according to the heating time, so that the control is simpler and more convenient.

How to adjust the heating intensity of the electromagnetic heating device according to the real-time temperature of the washing water and the target heating temperature and how to adjust the heating temperature of the electromagnetic heating device according to the heating time during the execution of the first heating process or the second heating process will be described in detail with reference to two specific embodiments.

First, how to adjust the heating intensity of the electromagnetic heating apparatus according to the real-time temperature of the washing water and the target heating temperature will be described.

Acquiring the current temperature of the washing water in the metal cylinder in the process of executing the first heating program or the second heating program; and selectively adjusting the heating intensity of the electromagnetic heating device according to the current temperature and the target heating temperature. In the heating process, the real-time water temperature of the washing water can be collected in real time or discontinuously and recorded as the current water temperature, and the heating intensity of the electromagnetic heating device is selectively adjusted according to the current water temperature and the target heating temperature. Wherein the adjustment can be performed according to the difference between the target heating temperature and the current water temperature, or according to the ratio between the current water temperature and the target heating temperature, etc., and such flexible adjustment and change do not depart from the principle and scope of the present invention, and should be limited within the protection scope of the present invention. The heating intensity of the electromagnetic heating device is preferably selectively adjusted according to the difference between the target heating temperature and the current temperature.

In one possible case, the electromagnetic heating device comprises a low gear, a medium gear and a high gear according to the heating intensity from low to high.

During the first heating procedure, the step of selectively adjusting the heating intensity of the electromagnetic heating device according to the difference between the target heating temperature and the current temperature specifically includes: s310: the electromagnetic heating device adopts high grade to heat the washing water in the metal cylinder; s311: when the difference value between the target heating temperature and the current temperature reaches a first preset value, the electromagnetic heating device heats the washing water in the metal cylinder by adopting a middle gear; s312: when the difference value between the target heating temperature and the current temperature reaches a second preset value, the electromagnetic heating device heats the washing water in the metal cylinder by adopting a low grade until the temperature of the washing water in the metal cylinder reaches the target heating temperature; in the process of executing the second heating program, the step of "selectively adjusting the heating intensity of the electromagnetic heating device according to the difference between the target heating temperature and the current temperature" specifically includes: s320: the electromagnetic heating device adopts high grade to heat the washing water in the metal cylinder; s321: when the difference value between the target heating temperature and the current temperature reaches a first preset value, the electromagnetic heating device heats the washing water in the metal cylinder by adopting a middle gear until the temperature of the washing water in the metal cylinder reaches the target heating temperature; wherein the first preset value is larger than the second preset value.

Illustratively, the preset temperature is 50 degrees, the first preset value is 10 degrees, the second preset value is 5 degrees, if the target heating temperature of the washing water is 45 degrees and is less than the preset temperature, a first heating program is adopted, high-grade heating is firstly adopted, the water temperature of the washing water is detected in real time during heating, when the water temperature reaches 35 degrees, the water temperature is reduced to middle grade to continue heating, and when the water temperature reaches 40 degrees, the water temperature is reduced to low grade to continue heating until the water temperature reaches 45 degrees; if the target heating temperature of the washing water is 55 ℃ and is higher than the preset temperature, a second heating program is adopted, high-grade heating is adopted, the water temperature of the washing water is detected in real time in the heating process, and when the water temperature reaches 45 ℃, the water temperature is reduced to a middle grade to continue heating until the water temperature reaches 55 ℃.

In another possible case, the electromagnetic heating device includes a first gear, a second gear, a third gear, a fourth gear and a fifth gear according to the heating intensity from low to high.

In the process of executing the first heating program, the step of "selectively adjusting the heating intensity of the electromagnetic heating device according to the difference between the target heating temperature and the current temperature" specifically includes: s310: heating the washing water in the metal cylinder by the electromagnetic heating device by adopting a fifth gear; s311: when the difference value between the target heating temperature and the current temperature reaches a first preset value, the electromagnetic heating device heats the washing water in the metal cylinder by adopting a fourth gear; s312: when the difference value between the target heating temperature and the current temperature reaches a second preset value, the electromagnetic heating device heats the washing water in the metal cylinder by adopting a third gear; s313: when the difference value between the target heating temperature and the current temperature reaches a third preset value, the electromagnetic heating device heats the washing water in the metal cylinder by adopting a second gear; s314: when the difference value between the target heating temperature and the current temperature reaches a fourth preset value, the electromagnetic heating device heats the washing water in the metal cylinder by adopting a first gear until the temperature of the washing water in the metal cylinder reaches the target heating temperature; in the process of executing the second heating program, the step of "selectively adjusting the heating intensity of the electromagnetic heating device according to the difference between the target heating temperature and the current temperature" specifically includes: s320: heating the washing water in the metal cylinder by the electromagnetic heating device by adopting a fifth gear; s321: when the difference value between the target heating temperature and the current temperature reaches a first preset value, the electromagnetic heating device heats the washing water in the metal cylinder by adopting a fourth gear; s322: when the difference value between the target heating temperature and the current temperature reaches a third preset value, the electromagnetic heating device heats the washing water in the metal cylinder by adopting a third gear until the temperature of the washing water in the metal cylinder reaches the target heating temperature; the first preset value is larger than the second preset value, the second preset value is larger than the third preset value, and the third preset value is larger than the fourth preset value.

Illustratively, the preset temperature is 50 degrees, the first preset value is 15 degrees, the second preset value is 10 degrees, the third preset value is 6 degrees, the fourth preset value is 3 degrees, if the target heating temperature of the washing water is 45 degrees and is lower than the preset temperature, the first heating program is adopted, firstly, the fifth gear heating is adopted, the water temperature of the washing water is detected in real time in the heating process, when the water temperature reaches 30 degrees, the fourth gear heating is reduced, when the water temperature reaches 35 degrees, the third gear heating is reduced, when the water temperature reaches 39 degrees, the second gear heating is reduced, and when the water temperature reaches 42 degrees, the first gear heating is reduced until the water temperature reaches 45 degrees; if the target heating temperature of the washing water is 55 ℃ and is higher than the preset temperature, a second heating program is adopted, the fifth heating program is adopted, the water temperature of the washing water is detected in real time in the heating process, when the water temperature reaches 40 ℃, the heating is continued by being reduced to the fourth heating program, and when the water temperature reaches 39 ℃, the heating is continued by being reduced to the third heating program until the water temperature reaches 55 ℃.

How to adjust the heating temperature of the electromagnetic heating apparatus according to the heating time will be described below.

In the process of executing the first heating program, the step of "selectively adjusting the heating intensity of the electromagnetic heating device according to the heating time of the electromagnetic heating device" specifically includes: s310: the electromagnetic heating device adopts high grade to heat the washing water in the metal cylinder; s311: when the heating time of the electromagnetic heating device reaches a first preset time, the electromagnetic heating device heats the washing water in the metal cylinder by adopting a middle gear; s312: when the heating time of the electromagnetic heating device reaches a second preset time, the electromagnetic heating device heats the washing water in the metal cylinder by adopting a low grade until the temperature of the washing water in the metal cylinder reaches a target heating temperature; in the process of executing the second heating program, the step of "selectively adjusting the heating intensity of the electromagnetic heating device according to the heating time of the electromagnetic heating device" specifically includes: s320: the electromagnetic heating device adopts high grade to heat the washing water in the metal cylinder; s321: when the heating time of the electromagnetic heating device reaches a first preset time, the electromagnetic heating device heats the washing water in the metal cylinder by adopting a middle gear until the temperature of the washing water in the metal cylinder reaches a target heating temperature; the first preset time is less than the second preset time.

Illustratively, the preset temperature is 50 degrees, the first preset time is 2 minutes, the second preset time is 3 minutes, if the target heating temperature is 45 degrees and is less than the preset temperature, a first heating program is adopted, high-grade heating is firstly adopted, in the heating process, when the heating time reaches 2 minutes, the medium-grade heating is reduced, and the heating is continued, when the heating time reaches 3 minutes, the low-grade heating is reduced until the water temperature reaches 45 degrees; if the target heating temperature is 55 ℃ and is higher than the preset temperature, a second heating program is adopted, high-grade heating is adopted firstly, and in the heating process, when the heating time reaches 2 minutes, the heating is reduced to medium grade, and the heating is continued until the water temperature reaches 55 ℃.

In the process of executing the first heating program, the step of "selectively adjusting the heating intensity of the electromagnetic heating device according to the heating time of the electromagnetic heating device" specifically includes: s310: heating the washing water in the metal cylinder by the electromagnetic heating device by adopting a fifth gear; s311: when the heating time of the electromagnetic heating device reaches a first preset time, the electromagnetic heating device heats the washing water in the metal cylinder by adopting a fourth gear; s312: when the heating time of the electromagnetic heating device reaches second preset time, the electromagnetic heating device heats the washing water in the metal cylinder by adopting a third gear; s313: when the heating time of the electromagnetic heating device reaches a third preset time, the electromagnetic heating device heats the washing water in the metal cylinder by adopting a second gear; s314: when the heating time of the electromagnetic heating device reaches the fourth preset time, the electromagnetic heating device heats the washing water in the metal cylinder by adopting the first gear until the temperature of the washing water in the metal cylinder reaches the target heating temperature; in the process of executing the second heating program, the step of "selectively adjusting the heating intensity of the electromagnetic heating device according to the heating time of the electromagnetic heating device" specifically includes: s320: heating the washing water in the metal cylinder by the electromagnetic heating device by adopting a fifth gear; s321: when the heating time of the electromagnetic heating device reaches a first preset time, the electromagnetic heating device heats the washing water in the metal cylinder by adopting a fourth gear; s322: when the heating time of the electromagnetic heating device reaches a third preset time, the electromagnetic heating device heats the washing water in the metal cylinder by adopting a third gear until the temperature of the washing water in the metal cylinder reaches a target heating temperature; the first preset time is less than the second preset time, the second preset time is less than the third preset time, and the third preset time is less than the fourth preset time.

Illustratively, the preset temperature is 50 degrees, the first preset time is 1 minute, the second preset time is 1.5 minutes, the third preset time is 2 minutes, and the fourth preset time is 3 minutes, if the target heating temperature is 45 degrees and is less than the preset temperature, the first heating program is adopted, firstly, the fifth gear heating is adopted, in the heating process, when the heating time reaches 1 minute, the fourth gear heating is reduced, when the heating time reaches 1.5 minutes, the third gear heating is reduced, when the heating time reaches 2 minutes, the second gear heating is reduced, and when the heating time reaches 3 minutes, the first gear heating is reduced until the water temperature reaches 45 degrees; if the target heating temperature is 55 ℃ and is higher than the preset temperature, a second heating program is adopted, firstly, a fifth heating step is adopted, in the heating process, when the heating time reaches 1 minute, the heating is reduced to a fourth heating step, and the heating is continued, when the heating time reaches 2 minutes, the heating is reduced to a third heating step, and the heating is continued until the water temperature reaches 55 ℃.

So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.

Claims

1. A washing water heating method of a drum washing machine including a cabinet, characterized in that the drum washing machine further includes:

a fixing device disposed within the case;

a metal drum rotatably disposed in the fixing device for containing articles to be washed and washing water; and

an electromagnetic heating device disposed on the fixing device, the electromagnetic heating device being capable of heating the metal cylinder to raise the temperature of the washing water in the metal cylinder;

the washing water heating method includes:

s1: acquiring a target heating temperature of the washing water in the metal cylinder;

s2: comparing the target heating temperature with a preset temperature;

s3: and selecting a corresponding heating program to heat the washing water in the metal cylinder according to the comparison result.

2. The washing water heating method as claimed in claim 1, wherein the step S3 specifically includes:

s31: if the target heating temperature is lower than the preset temperature, selecting a first heating program to heat the washing water in the metal cylinder;

s32: if the target heating temperature is not less than the preset temperature, selecting a second heating program to heat the washing water in the metal cylinder;

wherein the control accuracy of the first heating program is higher than the control accuracy of the second heating program.

3. The washing water heating method as claimed in claim 2, further comprising: prior to executing the first heating program or the second heating program,

acquiring the total amount of washing water in the metal cylinder;

comparing the total amount with a preset water amount;

if the total amount is less than the preset amount of water, during the execution of the first heating process or the second heating process,

acquiring the current temperature of the washing water in the metal cylinder;

selectively adjusting the heating intensity of the electromagnetic heating device according to the current temperature and the target heating temperature;

if the total amount is not less than the preset amount of water, during the execution of the first heating process or the second heating process,

selectively adjusting the heating intensity of the electromagnetic heating device according to the heating time of the electromagnetic heating device.

4. The washing water heating method as claimed in claim 2, further comprising: during the execution of the first heating process or the second heating process,

acquiring the current temperature of the washing water in the metal cylinder;

selectively adjusting the heating intensity of the electromagnetic heating device according to the current temperature and the target heating temperature.

5. The washing water heating method according to claim 4, wherein the step of selectively adjusting the heating intensity of the electromagnetic heating device according to the current temperature and the target heating temperature specifically comprises:

selectively adjusting the heating intensity of the electromagnetic heating device according to the difference value between the target heating temperature and the current temperature.

6. The washing water heating method according to claim 5, wherein the electromagnetic heating device includes a low range, a middle range and a high range according to a heating intensity from low to high,

in the process of executing the first heating program, the step of selectively adjusting the heating intensity of the electromagnetic heating device according to the difference between the target heating temperature and the current temperature specifically includes:

s310: enabling the electromagnetic heating device to adopt the high grade to heat the washing water in the metal cylinder;

s311: when the difference value between the target heating temperature and the current temperature reaches a first preset value, enabling the electromagnetic heating device to heat the washing water in the metal cylinder by adopting the middle gear;

s312: when the difference value between the target heating temperature and the current temperature reaches a second preset value, enabling the electromagnetic heating device to heat the washing water in the metal cylinder by adopting the low gear until the temperature of the washing water in the metal cylinder reaches the target heating temperature;

in the process of executing the second heating program, the step of selectively adjusting the heating intensity of the electromagnetic heating device according to the difference between the target heating temperature and the current temperature specifically includes:

s320: enabling the electromagnetic heating device to adopt the high grade to heat the washing water in the metal cylinder;

s321: when the difference value between the target heating temperature and the current temperature reaches the first preset value, enabling the electromagnetic heating device to heat the washing water in the metal cylinder by adopting the middle gear until the temperature of the washing water in the metal cylinder reaches the target heating temperature;

wherein the first preset value is greater than the second preset value.

7. The washing water heating method as claimed in claim 5, wherein the electromagnetic heating device includes a first gear, a second gear, a third gear, a fourth gear and a fifth gear according to a heating intensity from low to high,

s310: enabling the electromagnetic heating device to heat the washing water in the metal cylinder by adopting the fifth gear;

s311: when the difference value between the target heating temperature and the current temperature reaches a first preset value, enabling the electromagnetic heating device to heat the washing water in the metal cylinder by adopting the fourth gear;

s312: when the difference value between the target heating temperature and the current temperature reaches a second preset value, enabling the electromagnetic heating device to heat the washing water in the metal cylinder by adopting the third gear;

s313: when the difference value between the target heating temperature and the current temperature reaches a third preset value, enabling the electromagnetic heating device to heat the washing water in the metal cylinder by adopting the second gear;

s314: when the difference value between the target heating temperature and the current temperature reaches a fourth preset value, enabling the electromagnetic heating device to heat the washing water in the metal cylinder by adopting the first gear until the temperature of the washing water in the metal cylinder reaches the target heating temperature;

s320: enabling the electromagnetic heating device to heat the washing water in the metal cylinder by adopting the fifth gear;

s321: when the difference value between the target heating temperature and the current temperature reaches the first preset value, enabling the electromagnetic heating device to heat the washing water in the metal cylinder by adopting the fourth gear;

s322: when the difference value between the target heating temperature and the current temperature reaches the third preset value, enabling the electromagnetic heating device to heat the washing water in the metal cylinder by adopting the third gear until the temperature of the washing water in the metal cylinder reaches the target heating temperature;

the first preset value is larger than the second preset value, the second preset value is larger than the third preset value, and the third preset value is larger than the fourth preset value.

8. The washing water heating method as claimed in claim 2, further comprising: during the execution of the first heating process or the second heating process,

9. The washing water heating method according to claim 8, wherein the electromagnetic heating device includes a low range, a middle range and a high range according to a heating intensity from low to high,

in the process of executing the first heating program, the step of selectively adjusting the heating intensity of the electromagnetic heating device according to the heating time of the electromagnetic heating device specifically includes:

s311: when the heating time of the electromagnetic heating device reaches a first preset time, the electromagnetic heating device heats the washing water in the metal cylinder by adopting the middle gear;

s312: when the heating time of the electromagnetic heating device reaches a second preset time, the electromagnetic heating device heats the washing water in the metal cylinder by adopting the low gear until the temperature of the washing water in the metal cylinder reaches the target heating temperature;

in the process of executing the second heating program, the step of selectively adjusting the heating intensity of the electromagnetic heating device according to the heating time of the electromagnetic heating device specifically includes:

s321: when the heating time of the electromagnetic heating device reaches the first preset time, the electromagnetic heating device heats the washing water in the metal cylinder by adopting the middle gear until the temperature of the washing water in the metal cylinder reaches the target heating temperature;

wherein the first preset time is less than the second preset time.

10. The washing water heating method as claimed in claim 8, wherein the electromagnetic heating device includes a first gear, a second gear, a third gear, a fourth gear and a fifth gear according to a heating intensity from low to high,

s311: when the heating time of the electromagnetic heating device reaches a first preset time, the electromagnetic heating device heats the washing water in the metal cylinder by adopting the fourth gear;

s312: when the heating time of the electromagnetic heating device reaches second preset time, the electromagnetic heating device heats the washing water in the metal cylinder by adopting the third gear;

s313: when the heating time of the electromagnetic heating device reaches a third preset time, the electromagnetic heating device heats the washing water in the metal cylinder by adopting the second gear;

s314: when the heating time of the electromagnetic heating device reaches a fourth preset time, the electromagnetic heating device heats the washing water in the metal cylinder by adopting the first gear until the temperature of the washing water in the metal cylinder reaches the target heating temperature;

s321: when the heating time of the electromagnetic heating device reaches the first preset time, the electromagnetic heating device heats the washing water in the metal cylinder by adopting the fourth gear;

s322: when the heating time of the electromagnetic heating device reaches the third preset time, enabling the electromagnetic heating device to heat the washing water in the metal cylinder by adopting the third gear until the temperature of the washing water in the metal cylinder reaches the target heating temperature;

the first preset time is less than the second preset time, the second preset time is less than the third preset time, and the third preset time is less than the fourth preset time.