Washing water heating method for drum washing machine

Abstract

The present invention belongs to the technical field of washing equipment, and particularly provides a method for heating washing water of a drum washing machine. The washing machine includes: a cabinet; a fixing device disposed within the cabinet; a metal cylinder rotatably disposed within the fixing device; an electromagnetic heating device capable of heating the metal cylinder to increase the temperature of the washing water within the metal cylinder. The method for heating the washing water includes: obtaining the target heating temperature of the washing water within the metal cylinder; comparing the target heating temperature with a preset temperature; and selecting a corresponding heating program to heat the washing water within the metal cylinder according to the comparison result. By eliminating the outer cylinder of the washing machine and only retaining one metal cylinder, only the interior of the metal cylinder needs to be cleaned, which is very convenient. The electromagnetic heating device can directly heat the metal cylinder to increase the temperature of the washing water within the metal cylinder, with high heating efficiency. By setting the method for heating the washing water, the washing machine becomes more intelligent.

Description

Technical Field

[0001] The present invention belongs to the technical field of washing equipment, and particularly provides a method for heating washing water of a drum washing machine. Background Art

[0002] A washing machine is a cleaning appliance that uses electric energy to generate mechanical action to wash clothes. Currently, washing machines mainly include pulsator washing machines and drum washing machines.

[0003] Existing drum washing machines mainly include a cabinet, an outer tub, an inner tub, and a driving device disposed inside the cabinet. The inner tub is rotatably disposed inside the outer tub, and the driving device can drive the inner tub to rotate. After being used for a period of time, a lot of impurities will adhere to the outer wall of the inner tub and the inner wall of the outer tub. In a closed and humid environment, bacteria are likely to breed, affecting the health of users. Therefore, it is necessary to clean the washing machine regularly.

[0004] However, for a drum washing machine, professional after-sales personnel are required to carry out a relatively thorough cleaning, and ordinary consumers cannot complete a good cleaning job. Since the inner and outer tubs of a drum washing machine cannot be easily disassembled during design, the inner and outer tubs cannot be thoroughly cleaned.

[0005] Therefore, a new technical solution is needed in this field to solve the above problems. Summary of the Invention

[0006] To solve the above problems in the prior art, that is, to solve the problem of inconvenient cleaning of existing drum washing machines, the present invention provides a method for heating washing water of a drum washing machine. The drum washing machine includes a cabinet. The drum washing machine further includes: a fixing device disposed inside the cabinet; a metal tub rotatably disposed inside the fixing device for accommodating items to be washed and washing water; and an electromagnetic heating device disposed on the fixing device. The electromagnetic heating device can heat the metal tub to increase the temperature of the washing water inside the metal tub. The method for heating washing water includes: S1: obtaining the target heating temperature of the washing water inside the metal tub; S2: comparing the target heating temperature with a preset temperature; S3: selecting a corresponding heating program according to the comparison result to heat the washing water inside the metal tub.

[0007] In a preferred technical solution of the above method for heating washing water, step S3 specifically includes: S31: if the target heating temperature is less than the preset temperature, select a first heating program to heat the washing water inside the metal tub; S32: if the target heating temperature is not less than the preset temperature, select a second heating program to heat the washing water inside the metal tub; wherein, the control accuracy of the first heating program is higher than that of the second heating program.

[0008] In the preferred technical solution of the above washing water heating method, before executing the first heating program or the second heating program, obtain the total amount of the washing water in the metal cylinder; compare the total amount with a preset water volume; if the total amount is less than the preset water volume, then during the execution of the first heating program or the second heating program, obtain the current temperature of the washing water in the metal cylinder; according to the current temperature and the target heating temperature, selectively adjust the heating intensity of the electromagnetic heating device; if the total amount is not less than the preset water volume, then during the execution of the first heating program or the second heating program, according to the heating time of the electromagnetic heating device, selectively adjust the heating intensity of the electromagnetic heating device.

[0009] In the preferred technical solution of the above washing water heating method, during the execution of the first heating program or the second heating program, obtain the current temperature of the washing water in the metal cylinder; according to the current temperature and the target heating temperature, selectively adjust the heating intensity of the electromagnetic heating device.

[0010] In the preferred technical solution 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 between the target heating temperature and the current temperature.

[0011] In the preferred technical solution of the above washing water heating method, according to the heating intensity from low to high, the electromagnetic heating device includes a low gear, a medium gear, and a high gear. During the execution of 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: making the electromagnetic heating device use the high gear to heat the washing water in the metal cylinder; S311: when the difference between the target heating temperature and the current temperature reaches a first preset value, making the electromagnetic heating device use the medium gear to heat the washing water in the metal cylinder; S312: when the difference between the target heating temperature and the current temperature reaches a second preset value, making the electromagnetic heating device use the low gear to heat the washing water in the metal cylinder until the temperature of the washing water in the metal cylinder reaches the target heating temperature; During the execution of 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: making the electromagnetic heating device use the high gear to heat the washing water in the metal cylinder; S321: when the difference between the target heating temperature and the current temperature reaches the first preset value, making the electromagnetic heating device use the medium gear to heat the washing water in the metal cylinder 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.

[0012] In the preferred technical solution of the above washing water heating method, according to the heating intensity from low to high, the electromagnetic heating device includes a first gear, a second gear, a third gear, a fourth gear, and a fifth gear. During the execution of 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: making the electromagnetic heating device use the fifth gear to heat the washing water in the metal cylinder; S311: when the difference between the target heating temperature and the current temperature reaches a first preset value, making the electromagnetic heating device use the fourth gear to heat the washing water in the metal cylinder; S312: when the difference between the target heating temperature and the current temperature reaches a second preset value, making the electromagnetic heating device use the third gear to heat the washing water in the metal cylinder; S313: when the difference between the target heating temperature and the current temperature reaches a third preset value, making the electromagnetic heating device use the second gear to heat the washing water in the metal cylinder; S314: when the difference between the target heating temperature and the current temperature reaches a fourth preset value, making the electromagnetic heating device use the first gear to heat the washing water in the metal cylinder until the temperature of the washing water in the metal cylinder reaches the target heating temperature; During the execution of 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: making the electromagnetic heating device use the fifth gear to heat the washing water in the metal cylinder; S321: when the difference between the target heating temperature and the current temperature reaches the first preset value, making the electromagnetic heating device use the fourth gear to heat the washing water in the metal cylinder; S322: when the difference between the target heating temperature and the current temperature reaches the third preset value, making the electromagnetic heating device use the third gear to heat the washing water in the metal cylinder 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, the second preset value is greater than the third preset value, and the third preset value is greater than the fourth preset value.

[0013] In the preferred technical solution of the above washing water heating method, during the execution of the first heating program or the second heating program, according to the heating time of the electromagnetic heating device, the heating intensity of the electromagnetic heating device is selectively adjusted.

[0014] In the preferred technical solution of the above washing water heating method, according to the heating intensity from low to high, the electromagnetic heating device includes a low gear, a medium gear, and a high gear. During the execution of 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: making the electromagnetic heating device heat the washing water in the metal cylinder by using the high gear; S311: when the heating time of the electromagnetic heating device reaches the first preset time, making the electromagnetic heating device heat the washing water in the metal cylinder by using the medium gear; S312: when the heating time of the electromagnetic heating device reaches the second preset time, making the electromagnetic heating device heat the washing water in the metal cylinder by using the low gear until the temperature of the washing water in the metal cylinder reaches the target heating temperature; During the execution of 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: making the electromagnetic heating device heat the washing water in the metal cylinder by using the high gear; S321: when the heating time of the electromagnetic heating device reaches the first preset time, making the electromagnetic heating device heat the washing water in the metal cylinder by using the medium 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.

[0015] In the preferred technical solution of the above washing water heating method, according to the heating intensity from low to high, the electromagnetic heating device includes a first gear, a second gear, a third gear, a fourth gear, and a fifth gear. During the execution of 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: making the electromagnetic heating device use the fifth gear to heat the washing water in the metal cylinder; S311: when the heating time of the electromagnetic heating device reaches the first preset time, making the electromagnetic heating device use the fourth gear to heat the washing water in the metal cylinder; S312: when the heating time of the electromagnetic heating device reaches the second preset time, making the electromagnetic heating device use the third gear to heat the washing water in the metal cylinder; S313: when the heating time of the electromagnetic heating device reaches the third preset time, making the electromagnetic heating device use the second gear to heat the washing water in the metal cylinder; S314: when the heating time of the electromagnetic heating device reaches the fourth preset time, making the electromagnetic heating device use the first gear to heat the washing water in the metal cylinder until the temperature of the washing water in the metal cylinder reaches the target heating temperature; During the execution of 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: making the electromagnetic heating device use the fifth gear to heat the washing water in the metal cylinder; S321: when the heating time of the electromagnetic heating device reaches the first preset time, making the electromagnetic heating device use the fourth gear to heat the washing water in the metal cylinder; S322: when the heating time of the electromagnetic heating device reaches the third preset time, making the electromagnetic heating device use the third gear to heat the washing water in the metal cylinder 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, the second preset time is less than the third preset time, and the third preset time is less than the fourth preset time.

[0016] Those skilled in the art can understand that in the preferred technical solution of the present invention, the drum washing machine has no outer cylinder and only one metal cylinder for accommodating the items to be washed and the washing water. Therefore, it is very convenient to only clean the inside of the metal cylinder. Moreover, the washing machine is also provided with an electromagnetic heating device that can directly heat the metal cylinder to increase the temperature of the washing water in the metal cylinder, with high heating efficiency. In addition, the present invention also provides a washing water heating method. Before heating, the target heating temperature of the washing water is first obtained, and then the corresponding heating program is selected according to this target temperature. Through such a setting, the washing machine becomes more intelligent.

[0017] Further, the heating method further includes: if the target heating temperature is lower than the preset temperature, select the first heating program to heat the washing water in the metal cylinder; if the target heating temperature is not lower than the preset temperature, select the second heating program to heat the washing water in the metal cylinder; wherein, the control accuracy of the first heating program is higher than that of the second heating program. With such a setting, when the target heating temperature is lower than the preset temperature, it indicates that the clothes to be washed cannot withstand high temperatures. In this case, by using the first heating program with high control accuracy, the temperature of the washing water can be more accurately controlled, avoiding damage to the clothes due to excessive water temperature; conversely, when the target heating temperature is not lower than the preset temperature, it indicates that the clothes to be washed can withstand high temperatures. In this case, by using the second heating program with slightly lower control accuracy, the heating process can be simplified and the heating efficiency can be improved.

[0018] Further, the heating method further includes: before executing the first heating program or the second heating program, obtain the total amount of the washing water in the metal cylinder; compare the total amount with the preset water amount; if the total amount is less than the preset water amount, during the execution of the first heating program or the second heating program, obtain the current temperature of the washing water in the metal cylinder; according to the current temperature and the target heating temperature, selectively adjust the heating intensity of the electromagnetic heating device; if the total amount is not less than the preset water amount, during the execution of the first heating program or the second heating program, selectively adjust the heating intensity of the electromagnetic heating device according to the heating time of the electromagnetic heating device. With such a setting, before executing the heating program, first obtain the total amount of the washing water. When the total amount of the washing water is less than the preset water amount, it indicates that the washing water is less. During the heating process, if the heating intensity of the electromagnetic heating component is adjusted according to the heating time, the control difficulty is relatively large and it is easy to cause the water temperature to be too high. In this case, it is preferably to adjust the heating intensity of the electromagnetic heating device according to the actual temperature and the target heating temperature of the washing water, and the control is more accurate; conversely, when the total amount of the washing water is not less than the preset water amount, it indicates that the washing water is more. In this case, adjusting the heating intensity of the electromagnetic heating device according to the heating time is more convenient for control. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings, in which:

[0020] Figure 1 is a schematic structural diagram of the drum washing machine of the present invention Figure 1 ;

[0021] Figure 2 is a schematic structural diagram of the drum washing machine of the present invention Figure 2 ;

[0022] Figure 3 is a schematic structural diagram of the drum washing machine of the present invention Figure 3 ;

[0023] Figure 4 is a schematic structural view of the fixing device of the drum washing machine of the present invention;

[0024] Figure 5 is a schematic structural view of the washing drum of the drum washing machine of the present invention;

[0025] Figure 6 is an assembly schematic view of the first water pipe and the water collecting member of the drum washing machine of the present invention;

[0026] Figure 7 is a schematic structural view of the water collecting member of the drum washing machine of the present invention;

[0027] Figure 8 is an assembly schematic view of the rotating shaft, the cylindrical structure and the adapter of the drum washing machine of the present invention;

[0028] Figure 9 is a schematic structural view of the connecting member of the drum washing machine of the present invention;

[0029] Figure 10 is an assembly schematic of the washing drum and the electromagnetic heating device of the drum washing machine of the present invention Figure 1 ;

[0030] Figure 11 is an assembly schematic of the washing drum and the electromagnetic heating device of the drum washing machine of the present invention Figure 2 ;

[0031] Figure 12 is a flowchart of the washing water heating method of the drum washing machine of the present invention;

[0032] Figure 13 is a flowchart of an embodiment of the washing water heating method of the drum washing machine of the present invention. Detailed Embodiments

[0033] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0034] 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., which indicate directions or position relationships, are based on the directions or position relationships shown in the drawings. This is only for convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0035] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and defined, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0036] As Figures 1 to 3 shown, the drum washing machine of the present invention includes a cabinet 1, and a fixing device, a washing drum 2, a driving device, a water inlet and drainage device, and a vibration damping device are arranged inside the cabinet 1.

[0037] Continuing to refer to Figures 1 to 3 , the washing drum 2 is used to accommodate the items to be washed and washing water, and a laundry loading opening 211 is formed at the front end of the washing drum 2 (the left end of the washing drum 2 when viewed from Figure 1 ). The washing drum 2 is rotatably arranged inside the fixing device, and the driving device is drivingly connected to the rear end of the washing drum 2 (the right end of the washing drum 2 when viewed from Figure 1 ). When the washing machine is running, the driving device can drive the washing drum 2 to rotate. Among them, the rear end of the washing drum 2 has a rotating shaft 22, and the washing drum 2 is rotationally connected to the fixing device through the rotating shaft 22. Exemplarily, the driving device includes a first motor 31, a belt 32, and a pulley 33. Among them, the pulley 33 is fixedly connected to the rotating shaft 22, one end of the belt 32 is connected to the output shaft of the first motor 31, generally a small pulley is installed on the output shaft of the first motor 31, one end of the belt 32 is connected to this small pulley, the other end of the belt 32 is connected to the pulley 33 installed on the rotating shaft 22, and the first motor 31 drives the 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 above specific example. For example, a direct drive motor can also be used for driving. The stator device of the direct drive motor can be installed on the fixing device, and the rotor of the direct drive motor can be installed on the rotating shaft 22. Such adjustments and changes to the specific structural form of the driving device do not deviate from the principle and scope of the present invention and should all be defined within the protection scope of the present invention. The water inlet and drainage device is communicated with the rear end of the washing drum 2, and water can be supplied to the washing drum 2 or the water in the washing drum 2 can be discharged through this water inlet and drainage device.

[0038] Continuing to refer to Figures 1 to 3 , the vibration damping device is arranged between the fixing device and the cabinet 1, and vibration damping is carried out through the vibration damping device to reduce the vibration noise of the washing machine. Among them, the vibration damping device includes a suspension spring 41 and a damper 42. The top of the fixing device is fixedly connected to the cabinet 1 through the suspension spring 41, and the bottom of the fixing device is fixedly connected to the cabinet 1 through the damper 42.

[0039] As shown Figures 1 to 4 in the figure, the fixing device includes a main frame 51, and the washing tub 2 is rotatably arranged inside the main frame 51. The rotating shaft 22 is rotatably connected to the rear end of the main frame 51 (viewed from above, the right end of the main frame 51). A support structure is arranged at the rear end of the main frame 51, and the rotating shaft 22 is rotatably connected to this support structure. Among them, the support structure is a cylindrical structure 511. Figure 1

[0040] Continue to refer to Figure 2 Figure 4 and , the fixing device further includes a plurality of rollers 52 arranged on the main frame 51. In the installed state, the plurality of rollers 52 abut against the outer cylindrical wall of the washing tub 2. Exemplarily, the main frame 51 includes 4 cross beams 512 arranged along the axial direction of the washing tub 2, and one roller 52 is installed on each cross beam 512, and the rollers 52 are arranged close to the front end of the main frame 51. By arranging the rollers 52 to support the front end of the washing tub 2, the pressure on the rear end of the washing tub 2 on the rotating shaft 22 can be greatly reduced, so that both the design difficulty and processing cost of the rotating shaft 22 can be reduced, and the service life of the rotating shaft 22 can be extended. The main frame 51 includes two accommodating areas, which are arranged vertically and are denoted as the upper accommodating area 513 and the lower accommodating area 514. Among them, the washing tub 2 is located in the upper accommodating area 513.

[0041] Figure 5 As shown in the figure, a water passing structure is formed at the rear end of the washing tub 2, and the water inlet and drainage device is communicated with this water passing structure. Through this water passing structure, water can be supplied to the washing tub 2 or the water in the washing tub 2 can be discharged. Preferably, the water passing structure is a water passing port 212 formed at the junction of the rear wall and the inner cylindrical wall of the washing tub 2. By arranging the water passing port 212 at the junction of the rear wall and the inner cylindrical wall, it is more conducive to discharging the water in the washing tub 2. The inner diameter of the front end of the washing tub 2 is smaller than the inner diameter of the rear end of the washing tub 2. By such an arrangement, it is more conducive to the water in the washing tub 2 flowing towards the water passing port 212. A water collecting ring 213 is formed on the inner cylindrical wall of the washing tub 2, and this water collecting ring 213 is communicated with the water passing port 212. It can be seen from the figure that the water collecting ring 213 is a groove-like structure protruding outwards along the radial direction of the washing tub 2 on the inner cylindrical wall of the washing tub 2, so that the bottom of the ring of the water collecting ring 213 is lower than the inner cylindrical wall of the washing tub 2. In this way, the water in the washing tub 2 will gather towards the water collecting ring 213, which is conducive to discharging the water in the washing tub 2.

[0042] Figure 1 As shown Figure 3 , Figure 6 , Figure 8 ​​As shown, the water inlet and outlet device includes a first water inlet and outlet assembly, an adapter, and a second water inlet and outlet assembly which are connected in sequence, wherein the first water inlet and outlet assembly is connected to a water inlet 212 formed at the rear end of the washing tub 2, that is, the first water inlet and outlet assembly does not need to extend into the interior of the washing tub 2, the second water inlet and outlet assembly is connected to the outside, and the adapter is installed on the tubular structure 511. When the washing tub 2 rotates, the first water inlet and outlet assembly and the portion of the adapter connected to the first water inlet and outlet assembly can rotate with the washing tub 2, and the second water inlet and outlet assembly and the portion of the adapter connected to the second water inlet and outlet assembly are fixed.

[0043] The adapter is preferably configured as a rotating tee 64, which includes a rotating port 641 and a fixed port 642, wherein the rotating port 641 is connected to the first inlet and outlet assembly and can rotate with the first inlet and outlet assembly. There are two fixed ports 642, and the second inlet and outlet assembly includes an inlet pipe 65 and a drain pipe 66. One of the two fixed ports 642 is a water inlet, which is connected to the inlet pipe 65, and the other end of the inlet pipe 65 is connected to an external water supply source. The other fixed port 642 is a water outlet, which is connected to the drain pipe 66, and the other end of the drain pipe 66 is connected to a drain pump 67.

[0044] Continue reading Figures 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 connected in sequence, wherein the number of the first water pipe 61 can be more than one. Exemplarily, the number of the first water pipes 61 is three, and correspondingly, the number of the water ports 212 is also three, and the three water ports 212 are arranged along the circumference of the washing drum 2, the first end of the first water pipe 61 is connected to the corresponding water ports 212, one end of the water collecting member 62 is provided with a water diversion port 621, and the number of the water diversion ports 621 is three, the second end of the first water pipe 61 is connected to the corresponding water diversion port 621, and the other end of the water collecting member 62 is provided with a central port (not shown in the figure), and the multiple water diversion ports 621 are all connected to the central port, and the central port of the water collecting member 62 is connected to the rotating port 641 of the rotating tee 64 through the connecting pipe 63. In this way, the three first water pipes 61 are connected to the rotating tee 64 through the water collecting member 62 and the connecting pipe 63.

[0045] Continue reading Figure 8 The shaft 22 is provided with a channel 221, and the first water inlet and outlet assembly is connected with the rotating tee 64 via the channel 221 and the cylindrical structure 511. The inner diameter of the channel 221 is larger than the outer diameter of the cylindrical structure 511, and the cylindrical structure 511 is inserted into the channel 221 of the shaft 22, and the two are connected by a bearing 24 so that the two can rotate relative to each other.

[0046] like Figure 5 , Figure 8 and Figure 9As shown, the laundry tub 2 includes a metal tub 21, a rotating shaft 22, and a connecting member 23. Among them, the metal tub 21 is used to accommodate the items to be washed and the washing water. A laundry loading port 211, a water inlet 212, and a water collecting ring 213 are all formed on the metal tub 21. One end of the connecting member 23 is connected to the rear end of the metal tub 21 (viewed from Figure 5 above, it is the right end of the metal tub 21), and the other end of the connecting member 23 is connected to the rotating shaft 22. That is to say, the rotating shaft 22 is fixedly connected to the metal tub 21 through the connecting member 23. The driving device drives the rotating shaft 22 to rotate, and the rotating shaft 22 drives the metal tub 21 to rotate synchronously through the connecting member 23.

[0047] The connecting member 23 includes a connected cylindrical body 231 and connecting arms 232. Among them, the number of connecting arms 232 is multiple. Exemplarily, the number of connecting arms 232 is three. The three connecting arms 232 are arranged along the circumferential direction of the cylindrical body 231, preferably evenly arranged along the circumferential direction of the cylindrical body 231. The connecting arms 232 and the cylindrical body 231 can be fixedly connected or integrally provided. During installation, the rotating shaft 22 can be inserted into the cylindrical body 231, and the two can be in interference fit. In the installed situation, the connecting arms 232 are fixedly connected to the rear end of the metal tub 21, and the rotating shaft 22 is fixedly connected to the cylindrical body 231. And there is a certain gap between the end of the rotating shaft 22 and the rear end of the metal tub 21. The second end of the first water pipe 61 can enter the channel 221 of the rotating shaft 22 by means of this gap.

[0048] Specifically, in the installed situation, the water collecting member 62 can be fixed on the cylindrical body 231 of the connecting member 23, so that the water collecting member 62 is located at the gap between the rotating shaft 22 and the metal tub 21, and the water dividing port 621 of the water collecting member 62 faces the metal tub 21, and the concentrating port of the water collecting member 62 faces the channel 221 of the rotating shaft 22. In this way, the second end of the first water pipe 61 can be directly communicated with the corresponding water dividing port 621. The connecting pipe 63 is located inside the channel 221 and the cylindrical structure 511. The concentrating port of the water collecting member 62 is communicated with the left end of the connecting pipe 63. The rotary three-way 64 is fixed on the cylindrical structure 511, and the rotating port 641 of the rotary three-way 64 extends into the cylindrical structure 511. The right end of the connecting pipe 63 is communicated with the rotating port 641. The rotating port 641 of the rotary three-way 64, the connecting pipe 63, the water collecting member 62, and the first water pipe 61 can rotate synchronously with the metal tub 21. The three first water pipes 61 can be filled with water simultaneously or drained simultaneously. When draining water, in order to prevent air leakage, the laundry tub 2 can be kept rotating. Under the action of centripetal force, the washing water is evenly distributed along the water collecting ring 213, so that all three water inlets 212 are immersed in the water, thereby improving the drainage capacity of the washing machine and reducing the washing time.

[0049] Continue to refer to Figure 9, the structures of the three connecting arms 232 are the same. Taking one of them as an example, each connecting arm 232 includes a strip-shaped member 2321 and a reinforcing member 2322. Among them, the number of strip-shaped members 2321 is two, and the two strip-shaped members 2321 are arranged with a gap therebetween. The strip-shaped member 2321 is fixedly connected or integrally provided with the cylindrical body 231; the number of reinforcing members 2322 is multiple. Exemplarily, the number of reinforcing members 2322 is two, and both ends of the reinforcing member 2322 are fixedly connected or integrally provided with the two strip-shaped members 2321 respectively.

[0050] Preferably, the drum washing machine of the present invention further includes an air leakage prevention device. When the washing tub 2 is in a rotating state, the air leakage prevention device can keep the water inlet 212 and the corresponding first water pipe 61 in a communicating state. When the washing tub 2 is in a stationary state, the air leakage prevention device can keep the water inlet 212 that is not immersed in water and the corresponding first water pipe 61 in an interrupted state. When the washing machine is in a rotating state, for example, when the washing machine executes a dehydration program, the air leakage prevention device can keep the water inlet 212 and the corresponding first water pipe 61 in a communicating state. That is to say, the three water inlets 212 and the corresponding first water pipes 61 are all in a communicating state. In this way, drainage can be carried out simultaneously through the three first water pipes 61, improving the drainage capacity of the washing machine. When the washing machine is in a stationary state, for example, between the execution of the washing program and the rinsing program, it is necessary to drain the water in the washing tub 2. At this time, all the water in the washing tub 2 is located at the lower part of the washing tub 2. Only the water inlet 212 located at the bottom among the three water inlets 212 is immersed in water, and the other two water inlets 212 are located at the upper part and are not immersed in water. In this case, the air leakage prevention device can keep the two water inlets 212 located at the upper part (that is, the water inlets 212 that are not immersed in water) and the corresponding first water pipes 61 in an interrupted state. In this way, after starting the drain pump 67, air leakage of these two first water pipes 61 can be prevented, thereby ensuring the smooth execution of the drainage program.

[0051] As Figure 5 shown, the air leakage prevention device includes a plurality of air leakage prevention units. Exemplarily, the air leakage prevention device includes three air leakage prevention units. The structures of the three air leakage prevention units can be the same or different. Of course, it is preferably to set the three air leakage prevention units to have the same structure. Each air leakage prevention unit includes two cooperating air leakage prevention members, denoted as a first air leakage prevention member and a second air leakage prevention member. A chamber is formed in the first air leakage prevention member, and the second air leakage prevention member is located in this chamber. The top of the chamber is communicated with the first water pipe 61, and the middle position close to the chamber is communicated with the water inlet 212. This section of the chamber is denoted as a communication chamber 71 for communicating the first water pipe 61 and the water inlet 212. The end chamber located below the communication chamber 71 is denoted as a receiving chamber 72. Generally, the second air leakage prevention member is located in this receiving chamber 72. The second air leakage prevention member is a spherical structure 73. 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 chamber 71.

[0052] When the washing tub 2 rotates, under the action of centrifugal force, the spherical structure 73 is always located within the accommodating chamber 72. In this case, the water inlet 212 remains in communication with the corresponding communication chamber 71 and the first water pipe 61. When the washing tub 2 stops rotating, two air leakage prevention units are located at the upper part, and one air leakage prevention unit is located at the bottom end. Under the action of its own gravity, the spherical structure 73 of the air leakage prevention unit located at the bottom end is located within the accommodating chamber 72, and the water inlet 212 at the bottom end (this water inlet 212 is immersed in water) remains in communication with the corresponding communication chamber 71 and the first water pipe 61, allowing drainage. Under the action of its own gravity, the spherical structure 73 of the air leakage prevention unit located at the upper part moves towards the first water pipe 61. Since the outer diameter of the spherical structure 73 is greater than the inner diameter of the first water pipe 61, the first water pipe 61 can be sealed. Especially when the drain pump 67 is activated, under the suction force of the drain pump 67, the spherical structure 73 can more tightly seal the first water pipe 61 to prevent air leakage from the first water pipe 61. Of course, it is also possible to make the outer diameter of the spherical structure 73 greater than the inner diameter of the communication chamber 71. In this way, the spherical structure 73 can directly seal the communication chamber 71, that is, indirectly seal the first water pipe 61, and can also prevent air leakage from the first water pipe 61.

[0053] It should be noted that the air leakage prevention device may only include two air leakage prevention units. One of the three water inlets 212 is the main one and the other two are auxiliary. No air leakage prevention unit is provided at the main water inlet 212, and air leakage prevention units are only provided at the other two water inlets 212. When the washing tub 2 stops rotating, the main water inlet 212 is located at the bottom for drainage, and the other two water inlets 212 are correspondingly sealed through the air leakage prevention units.

[0054] As Figure 10 and Figure 11 shown, the drum washing machine of the present invention further includes an electromagnetic heating device. The electromagnetic heating device is installed on the fixing device. Exemplarily, the electromagnetic heating device can be installed within the lower accommodating area 514 of the main frame 51. Through the electromagnetic heating device, the metal tub 21 can be directly heated to increase the temperature of the washing water within the metal tub 21. Among them, the metal tub 21 can be made of magnetically conductive stainless steel.

[0055] Continue to refer to Figure 10 and Figure 11, The electromagnetic heating device 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 installed on the fixing device. Exemplarily, the driving member can be installed in the lower accommodating area 514 of the main frame 51. After the electromagnetic heating member 81 is powered on, the driving member can be started. 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 making the electromagnetic heating member 81 reciprocate along the axial direction of the metal cylinder 21, the metal cylinder 21 can be uniformly heated, thereby improving the heating efficiency.

[0056] Continue to refer to Figure 10 and Figure 11 , The driving member is preferably a motor, denoted as the 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. Among them, the lead screw 83 is fixedly connected to the output shaft of the second motor 82, and the nut 84 is connected to the electromagnetic heating member 81. The second motor 82 can drive the lead screw 83 to rotate. When the lead screw 83 rotates, the nut 84 can move left and right along the lead screw 83, and at the same time drive the electromagnetic heating member 81 to reciprocate along the axial direction of the metal cylinder 21.

[0057] The electromagnetic heating device further includes a guiding assembly. The guiding assembly includes a first guiding member and a second guiding member. Among them, the first guiding member is arranged on the fixing device, and the second guiding member is arranged on the electromagnetic heating member 81. During the process of the second motor 82 driving the electromagnetic heating member 81 to reciprocate, the first guiding member and the second guiding member cooperate with each other to prevent the electromagnetic heating member 81 from swaying left and right during the movement. Through such a setting, the electromagnetic heating member 81 is more stable during the reciprocating movement, and the heating efficiency is improved.

[0058] Continue to refer to Figure 10 and Figure 11 , The first guiding member includes two support plates 85 arranged oppositely. Looking from Figure 11 above, the two support plates 85 are arranged relatively left and right. Each support plate 85 is provided with a guiding groove 851. The guiding groove 851 extends along the length direction of the metal cylinder 21. The second guiding member includes a guiding rod 86 and a connecting rod 87. The guiding rod 86 is fixedly connected to the electromagnetic heating member 81 through the connecting rod 87. During installation, the guiding rod 86 is placed between the two support plates 85, and both ends of the guiding rod 86 are respectively located in the guiding grooves 851 arranged on the two support plates 85. The guiding rod 86 is adapted to the guiding groove 851. During the reciprocating movement of the electromagnetic heating member 81, both ends of the guiding rod 86 slide along the guiding groove 851, which can prevent the electromagnetic heating member 81 from swaying left and right.

[0059] It should be noted that in practical applications, those skilled in the art can also set the first guiding member and the second guiding member into other structural forms. For example, the first guiding member includes two horizontal guiding rods arranged side by side left and right, and the second guiding member is set as a vertical plate-like member with two guiding holes opened on the plate-like member, and the two guiding holes respectively correspond to the two guiding rods, etc. Such adjustments and changes to the specific structural forms of the first guiding member and the second guiding member do not deviate from the principles and scope of the present invention and should all be defined within the protection scope of the present invention.

[0060] Continue to refer to Figure 10 , the number of the guiding rods 86 and the connecting rods 87 is both two, the guiding rods 86 and the connecting rods 87 correspond one by one, the guiding rods 86 are connected to the electromagnetic heating member 81 through the corresponding connecting rods 87, and the two guiding rods 86 are arranged front and back along the length direction of the metal cylinder 21. Through the common guiding of the two guiding rods 86 arranged front and back, the stability of the electromagnetic heating member 81 during the reciprocating movement can be further improved.

[0061] Continue to refer to Figure 10 , the guiding groove 851 is inclined downward along the direction from the front end of the metal cylinder 21 towards the rear end of the metal cylinder 21. From the figure, it can be seen that the guiding groove 851 is inclined downward to the right. In this way, during the reciprocating movement of the electromagnetic heating member 81, the distance between it and the outer cylinder wall of the metal cylinder 21 remains unchanged, which is beneficial to improving the heating efficiency.

[0062] Wherein, a horizontal plate-like member 88 can be arranged between the two connecting rods 87, and a through hole is opened on the plate-like member 88. A vertical rod-like member 89 is arranged on the nut 84, and the top end of the rod-like member 89 passes through the through hole, and moreover, the rod-like member 89 can move freely up and down in the through hole. In this way, the electromagnetic heating member 81 can be driven to move back and forth through the vertical rod-like member 89, and the electromagnetic heating member 81 is also allowed to move up and down.

[0063] Based on the above-mentioned drum washing machine, the present invention also provides a washing water heating method, as Figure 12 shown, the washing water heating method includes the following steps: S1: Obtain the target heating temperature of the washing water in the metal cylinder; S2: Compare the target heating temperature with the preset temperature; S3: According to the comparison result, select the corresponding heating program to heat the washing water in the metal cylinder. Before the washing machine leaves the factory, multiple heating programs can be pre-stored in the washing machine, and the heating programs have a corresponding relationship with the target heating temperature of the washing water. Before heating, first obtain the target heating temperature of the washing water, and then select the corresponding heating program according to the target temperature. Through such a setting, the washing machine becomes more intelligent.

[0064] As Figure 13As shown, step S3 specifically includes: S31: If the target heating temperature is less than the preset temperature, select the 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, select the second heating program to heat the washing water in the metal cylinder; wherein, the control accuracy of the first heating program is better than that of the second heating program.

[0065] That is to say, there are two heating programs pre-stored in the washing machine. When the target heating temperature is less than the preset temperature, it means that the clothes to be washed cannot withstand high temperatures. In this case, using the first heating program with high control accuracy can more accurately control the temperature of the washing water and avoid damaging the clothes due to too high water temperature; on the contrary, when the target heating temperature is greater than or equal to the preset temperature, it means that the clothes to be washed can withstand high temperatures. In this case, using the second heating program with slightly lower control accuracy can simplify the heating process and improve the heating efficiency.

[0066] During the execution of the first heating program or the second heating program, the heating intensity of the electromagnetic heating device can be adjusted according to the real-time temperature of the washing water and the target heating temperature, or the heating intensity of the electromagnetic heating device can be adjusted according to the heating time.

[0067] Preferably, before executing the first heating program or the second heating program, obtain the total amount of the washing water in the metal cylinder; compare the total amount with the preset water amount; if the total amount is less than the preset water amount, during the execution of the first heating program or the second heating program, obtain the current temperature of the washing water in the metal cylinder; according to the current temperature and the target heating temperature, selectively adjust the heating intensity of the electromagnetic heating device; if the total amount is not less than the preset water amount, during the execution of the first heating program or the second heating program, selectively adjust the heating intensity of the electromagnetic heating device according to the heating time of the electromagnetic heating device.

[0068] That is to say, before executing the heating program, first obtain the total amount of the washing water. When the total amount of the washing water is less than the preset water amount, it means that the washing water is less. During the heating process, if the heating intensity of the electromagnetic heating component is adjusted according to the heating time, the control difficulty is relatively large and it is easy to cause the water temperature to be too high. In this case, it is preferred 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 the control is more accurate; on the contrary, when the total amount of the washing water is greater than or equal to the preset water amount, it means that the washing water is more. In this case, adjusting the heating intensity of the electromagnetic heating device according to the heating time is more convenient for control.

[0069] The following will introduce in detail 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 program or the second heating program, in combination with two specific embodiments.

[0070] First, introduce 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.

[0071] During the execution of the first heating program or the second heating program, obtain the current temperature of the washing water in the metal cylinder; according to the current temperature and the target heating temperature, selectively adjust the heating intensity of the electromagnetic heating device. During the heating process, the real-time water temperature of the washing water can be collected in real time or intermittently, recorded as the current water temperature, and according to the current water temperature and the target heating temperature, selectively adjust the heating intensity of the electromagnetic heating device. Among them, it can be adjusted according to the difference between the target heating temperature and the current water temperature, or it can also be adjusted according to the ratio of the current water temperature to the target heating temperature, etc. Such flexible adjustment and change do not deviate from the principle and scope of the present invention and should all be limited within the protection scope of the present invention. Preferably, the heating intensity of the electromagnetic heating device is selectively adjusted according to the difference between the target heating temperature and the current temperature.

[0072] In a possible situation, according to the heating intensity from low to high, the electromagnetic heating device includes a low gear, a medium gear, and a high gear.

[0073] During the execution of the first heating program, the steps 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 include: S310: Make the electromagnetic heating device heat the washing water in the metal cylinder at a high gear; S311: When the difference between the target heating temperature and the current temperature reaches the first preset value, make the electromagnetic heating device heat the washing water in the metal cylinder at a medium gear; S312: When the difference between the target heating temperature and the current temperature reaches the second preset value, make the electromagnetic heating device heat the washing water in the metal cylinder at a low gear until the temperature of the washing water in the metal cylinder reaches the target heating temperature; During the execution of the second heating program, the steps 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 include: S320: Make the electromagnetic heating device heat the washing water in the metal cylinder at a high gear; S321: When the difference between the target heating temperature and the current temperature reaches the first preset value, make the electromagnetic heating device heat the washing water in the metal cylinder at a medium gear until the temperature of the washing water in the metal cylinder reaches the target heating temperature; where the first preset value is greater than the second preset value.

[0074] Exemplarily, the preset temperature is 50 degrees, the first preset value is 10, the second preset value is 5. If the target heating temperature of the washing water is 45 degrees, which is less than the preset temperature, the first heating program is adopted. First, high gear heating is used. During the heating process, the water temperature of the washing water is detected in real time. When the water temperature reaches 35 degrees, it is reduced to medium gear for continuous heating. When the water temperature reaches 40 degrees, it is reduced to low gear for continuous heating until the water temperature reaches 45 degrees. If the target heating temperature of the washing water is 55 degrees, which is greater than the preset temperature, the second heating program is adopted. First, high gear heating is also used. During the heating process, the water temperature of the washing water is detected in real time. When the water temperature reaches 45 degrees, it is reduced to medium gear for continuous heating until the water temperature reaches 55 degrees.

[0075] In another possible scenario, according to the heating intensity from low to high, the electromagnetic heating device includes the first gear, the second gear, the third gear, the fourth gear, and the fifth gear.

[0076] During the execution of 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: making the electromagnetic heating device use the fifth gear to heat the washing water in the metal cylinder; S311: when the difference between the target heating temperature and the current temperature reaches the first preset value, making the electromagnetic heating device use the fourth gear to heat the washing water in the metal cylinder; S312: when the difference between the target heating temperature and the current temperature reaches the second preset value, making the electromagnetic heating device use the third gear to heat the washing water in the metal cylinder; S313: when the difference between the target heating temperature and the current temperature reaches the third preset value, making the electromagnetic heating device use the second gear to heat the washing water in the metal cylinder; S314: when the difference between the target heating temperature and the current temperature reaches the fourth preset value, making the electromagnetic heating device use the first gear to heat the washing water in the metal cylinder until the temperature of the washing water in the metal cylinder reaches the target heating temperature. During the execution of 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: making the electromagnetic heating device use the fifth gear to heat the washing water in the metal cylinder; S321: when the difference between the target heating temperature and the current temperature reaches the first preset value, making the electromagnetic heating device use the fourth gear to heat the washing water in the metal cylinder; S322: when the difference between the target heating temperature and the current temperature reaches the third preset value, making the electromagnetic heating device use the third gear to heat the washing water in the metal cylinder 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, the second preset value is greater than the third preset value, and the third preset value is greater than the fourth preset value.

[0077] Exemplarily, the preset temperature is 50 degrees, the first preset value is 15, the second preset value is 10, the third preset value is 6, and the fourth preset value is 3. If the target heating temperature of the washing water is 45 degrees, which is less than the preset temperature, the first heating program is adopted. First, the fifth gear is used for heating. During the heating process, the water temperature of the washing water is detected in real time. When the water temperature reaches 30 degrees, it is reduced to the fourth gear for continuous heating. When the water temperature reaches 35 degrees, it is reduced to the third gear for continuous heating. When the water temperature reaches 39 degrees, it is reduced to the second gear for continuous heating. When the water temperature reaches 42 degrees, it is reduced to the first gear for continuous heating until the water temperature reaches 45 degrees. If the target heating temperature of the washing water is 55 degrees, which is greater than the preset temperature, the second heating program is adopted. First, the fifth gear is also used for heating. During the heating process, the water temperature of the washing water is detected in real time. When the water temperature reaches 40 degrees, it is reduced to the fourth gear for continuous heating. When the water temperature reaches 39 degrees, it is reduced to the third gear for continuous heating until the water temperature reaches 55 degrees.

[0078] The following introduces how to adjust the heating temperature of the electromagnetic heating device according to the heating time.

[0079] In a possible scenario, according to the heating intensity from low to high, the electromagnetic heating device includes a low gear, a medium gear, and a high gear.

[0080] During the execution of 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: making the electromagnetic heating device use the high gear to heat the washing water in the metal cylinder; S311: when the heating time of the electromagnetic heating device reaches the first preset time, making the electromagnetic heating device use the medium gear to heat the washing water in the metal cylinder; S312: when the heating time of the electromagnetic heating device reaches the second preset time, making the electromagnetic heating device use the low gear to heat the washing water in the metal cylinder until the temperature of the washing water in the metal cylinder reaches the target heating temperature. During the execution of 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: making the electromagnetic heating device use the high gear to heat the washing water in the metal cylinder; S321: when the heating time of the electromagnetic heating device reaches the first preset time, making the electromagnetic heating device use the medium gear to heat the washing water in the metal cylinder until the temperature of the washing water in the metal cylinder reaches the target heating temperature. Among them, the first preset time is less than the second preset time.

[0081] Exemplarily, the preset temperature is 50 degrees, the first preset time is 2 minutes, and the second preset time is 3 minutes. If the target heating temperature is 45 degrees, which is less than the preset temperature, the first heating program is adopted. First, high gear heating is used. During the heating process, when the heating time reaches 2 minutes, it is reduced to medium gear and continues to heat. When the heating time reaches 3 minutes, it is reduced to low gear and continues to heat until the water temperature reaches 45 degrees. If the target heating temperature is 55 degrees, which is greater than the preset temperature, the second heating program is adopted. First, high gear heating is used. During the heating process, when the heating time reaches 2 minutes, it is reduced to medium gear and continues to heat until the water temperature reaches 55 degrees.

[0082] In another possible scenario, according to the heating intensity from low to high, the electromagnetic heating device includes the first gear, the second gear, the third gear, the fourth gear, and the fifth gear.

[0083] During the execution of 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: making the electromagnetic heating device use the fifth gear to heat the washing water in the metal cylinder; S311: when the heating time of the electromagnetic heating device reaches the first preset time, making the electromagnetic heating device use the fourth gear to heat the washing water in the metal cylinder; S312: when the heating time of the electromagnetic heating device reaches the second preset time, making the electromagnetic heating device use the third gear to heat the washing water in the metal cylinder; S313: when the heating time of the electromagnetic heating device reaches the third preset time, making the electromagnetic heating device use the second gear to heat the washing water in the metal cylinder; S314: when the heating time of the electromagnetic heating device reaches the fourth preset time, making the electromagnetic heating device use the first gear to heat the washing water in the metal cylinder until the temperature of the washing water in the metal cylinder reaches the target heating temperature. During the execution of 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: making the electromagnetic heating device use the fifth gear to heat the washing water in the metal cylinder; S321: when the heating time of the electromagnetic heating device reaches the first preset time, making the electromagnetic heating device use the fourth gear to heat the washing water in the metal cylinder; S322: when the heating time of the electromagnetic heating device reaches the third preset time, making the electromagnetic heating device use the third gear to heat the washing water in the metal cylinder until the temperature of the washing water in the metal cylinder reaches the target heating temperature. Among them, 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.

[0084] Exemplarily, 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, which is lower than the preset temperature, the first heating program is adopted. First, the fifth gear is used for heating. During the heating process, when the heating time reaches 1 minute, it is reduced to the fourth gear and continues to heat. When the heating time reaches 1.5 minutes, it is reduced to the third gear and continues to heat. When the heating time reaches 2 minutes, it is reduced to the second gear and continues to heat. When the heating time reaches 3 minutes, it is reduced to the first gear and continues to heat until the water temperature reaches 45 degrees. If the target heating temperature is 55 degrees, which is higher than the preset temperature, the second heating program is adopted. First, the fifth gear is used for heating. During the heating process, when the heating time reaches 1 minute, it is reduced to the fourth gear and continues to heat. When the heating time reaches 2 minutes, it is reduced to the third gear and continues to heat until the water temperature reaches 55 degrees.

[0085] So far, the technical solution of the present invention has been described in conjunction with the preferred embodiments shown in the drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A method for heating washing water of a drum washing machine, the drum washing machine comprising a cabinet, characterized in that, The drum washing machine further includes: A fixing device, which is arranged inside the cabinet; A metal cylinder, which is rotatably arranged inside the fixing device and is used for accommodating articles to be washed and washing water; and An electromagnetic heating device, which is arranged on the fixing device and can heat the metal cylinder to increase the temperature of the washing water inside the metal cylinder; The method for heating the washing water includes: S1: Obtain the target heating temperature of the washing water inside the metal cylinder; S2: Compare the target heating temperature with a preset temperature; S3: According to the comparison result, select a corresponding heating program to heat the washing water inside the metal cylinder; Step S3 specifically includes: S31: If the target heating temperature is less than the preset temperature, select a first heating program to heat the washing water inside the metal cylinder; S32: If the target heating temperature is not less than the preset temperature, select a second heating program to heat the washing water inside the metal cylinder; Wherein, the control accuracy of the first heating program is higher than that of the second heating program.

2. The washing water heating method according to claim 1, wherein, The method for heating the washing water further includes: before executing the first heating program or the second heating program, Obtain the total amount of the washing water inside the metal cylinder; Compare the total amount with a preset water amount; If the total amount is less than the preset water amount, then during the execution of the first heating program or the second heating program, Obtain the current temperature of the washing water inside the metal cylinder; Selectively adjust 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, then during the execution of the first heating program or the second heating program, Selectively adjust the heating intensity of the electromagnetic heating device according to the heating time of the electromagnetic heating device.

3. The washing water heating method according to claim 1, characterized in that, The method for heating the washing water further includes: during the execution of the first heating program or the second heating program, Obtain the current temperature of the washing water inside the metal cylinder; Selectively adjust the heating intensity of the electromagnetic heating device according to the current temperature and the target heating temperature.

4. The washing water heating method according to claim 3, wherein The step of "selectively adjust the heating intensity of the electromagnetic heating device according to the current temperature and the target heating temperature" specifically includes: Selectively adjust the heating intensity of the electromagnetic heating device according to the difference between the target heating temperature and the current temperature.

5. The washing water heating method according to claim 4, wherein According to the heating intensity from low to high, the electromagnetic heating device includes a low gear, a medium gear and a high gear, During the execution of the first heating program, the step of "selectively adjust the heating intensity of the electromagnetic heating device according to the difference between the target heating temperature and the current temperature" specifically includes: S310: Make the electromagnetic heating device heat the washing water inside the metal cylinder with the high gear; S311: When the difference between the target heating temperature and the current temperature reaches a first preset value, make the electromagnetic heating device heat the washing water inside the metal cylinder with the medium gear; S312: When the difference between the target heating temperature and the current temperature reaches a second preset value, cause the electromagnetic heating device to heat the washing water in the metal cylinder at the low gear until the temperature of the washing water in the metal cylinder reaches the target heating temperature; During the execution of 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: Cause the electromagnetic heating device to heat the washing water in the metal cylinder at the high gear; S321: When the difference between the target heating temperature and the current temperature reaches the first preset value, cause the electromagnetic heating device to heat the washing water in the metal cylinder at the medium 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.

6. The washing water heating method according to claim 4, characterized in that, According to the heating intensity from low to high, the electromagnetic heating device includes a first gear, a second gear, a third gear, a fourth gear, and a fifth gear. During the execution of 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: Cause the electromagnetic heating device to heat the washing water in the metal cylinder at the fifth gear; S311: When the difference between the target heating temperature and the current temperature reaches the first preset value, cause the electromagnetic heating device to heat the washing water in the metal cylinder at the fourth gear; S312: When the difference between the target heating temperature and the current temperature reaches the second preset value, cause the electromagnetic heating device to heat the washing water in the metal cylinder at the third gear; S313: When the difference between the target heating temperature and the current temperature reaches the third preset value, cause the electromagnetic heating device to heat the washing water in the metal cylinder at the second gear; S314: When the difference between the target heating temperature and the current temperature reaches the fourth preset value, cause the electromagnetic heating device to heat the washing water in the metal cylinder at the first gear until the temperature of the washing water in the metal cylinder reaches the target heating temperature; During the execution of 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: Cause the electromagnetic heating device to heat the washing water in the metal cylinder at the fifth gear; S321: When the difference between the target heating temperature and the current temperature reaches the first preset value, cause the electromagnetic heating device to heat the washing water in the metal cylinder at the fourth gear; S322: When the difference between the target heating temperature and the current temperature reaches the third preset value, cause the electromagnetic heating device to heat the washing water in the metal cylinder at the third 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, the second preset value is greater than the third preset value, and the third preset value is greater than the fourth preset value.

7. The washing water heating method according to claim 1, wherein The washing water heating method further includes: during the execution of the first heating program or the second heating program, selectively adjusting the heating intensity of the electromagnetic heating device according to the heating time of the electromagnetic heating device.

8. The washing water heating method according to claim 7, characterized in that, According to the heating intensity from low to high, the electromagnetic heating device includes a low gear, a medium gear, and a high gear. During the execution of 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: Making the electromagnetic heating device heat the washing water in the metal cylinder using the high gear; S311: When the heating time of the electromagnetic heating device reaches the first preset time, making the electromagnetic heating device heat the washing water in the metal cylinder using the medium gear; S312: When the heating time of the electromagnetic heating device reaches the second preset time, making the electromagnetic heating device heat the washing water in the metal cylinder using the low gear until the temperature of the washing water in the metal cylinder reaches the target heating temperature; During the execution of 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: Making the electromagnetic heating device heat the washing water in the metal cylinder using the high gear; S321: When the heating time of the electromagnetic heating device reaches the first preset time, making the electromagnetic heating device heat the washing water in the metal cylinder using the medium 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.

9. The washing water heating method according to claim 7, characterized in that According to the heating intensity from low to high, the electromagnetic heating device includes a first gear, a second gear, a third gear, a fourth gear, and a fifth gear. During the execution of 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: Making the electromagnetic heating device heat the washing water in the metal cylinder using the fifth gear; S311: When the heating time of the electromagnetic heating device reaches the first preset time, making the electromagnetic heating device heat the washing water in the metal cylinder using the fourth gear; S312: When the heating time of the electromagnetic heating device reaches the second preset time, making the electromagnetic heating device heat the washing water in the metal cylinder using the third gear; S313: When the heating time of the electromagnetic heating device reaches the third preset time, making the electromagnetic heating device heat the washing water in the metal cylinder using the second gear; S314: When the heating time of the electromagnetic heating device reaches the fourth preset time, make the electromagnetic heating device use the first gear to heat the washing water in the metal cylinder until the temperature of the washing water in the metal cylinder reaches the target heating temperature; During the execution of 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: Make the electromagnetic heating device use the fifth gear to heat the washing water in the metal cylinder; S321: When the heating time of the electromagnetic heating device reaches the first preset time, make the electromagnetic heating device use the fourth gear to heat the washing water in the metal cylinder; S322: When the heating time of the electromagnetic heating device reaches the third preset time, make the electromagnetic heating device use the third gear to heat the washing water in the metal cylinder 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, the second preset time is less than the third preset time, and the third preset time is less than the fourth preset time.

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