Drum washing machine, method for operating same, and corresponding computer program product

Abstract

The present invention discloses a drum washing machine (1) comprising: an outer drum (11); and an inner tub (12) for receiving items to be washed, the inner tub (12) being rotatably arranged within the outer tub (11); wherein the bottom wall of the outer cylinder (11) comprises a displaceable part (111) which can be controllably displaced relative to the inner cylinder (12) so as to correspondingly and locally adjust a gap (13) between the outer cylinder (11) and the inner cylinder (12). The invention also correspondingly discloses a method for operating the drum washing machine (1) and a corresponding computer program product. According to certain exemplary embodiments of the present invention, through displacement of the displaceable portion (111), negative pressure dehydration can be achieved without high-speed rotation of the drum, thereby simplifying design and reducing noise, and in addition, water consumption and heating energy consumption in a soaking stage can also be reduced.

Description

Technical Field

[0001] The present invention relates to a drum washing machine, a corresponding method for operating a drum washing machine and a corresponding computer program product. Background Art

[0002] With the improvement of people's living standards and the advancement of technology, more and more household appliances are entering thousands of households to assist and enrich people's lives.

[0003] Obviously, washing machines, as washing equipment, greatly facilitate people's lives. At present, drum washing machines have been greatly popularized due to their excellent performance and other reasons.

[0004] The drum washing machine dehydrates by rotating the inner drum at a high speed, which makes the clothes in the drum also rotate at a high speed. Under the action of centrifugal force, the water in the fabric fibers is thrown off, thus achieving a dehydration effect. However, the machine generates a lot of noise during the high-speed dehydration stage; and the high-speed rotation of the inner drum has high requirements for the vibration and strength design of the whole machine.

[0005] Moreover, the inner drum is rotatably arranged in the outer drum, and a certain safety distance needs to be maintained between them to adapt to the high-speed rotation of the inner drum. This distance causes a large amount of water to be located between the inner drum and the outer drum in the bottom area during the soaking stage, and the clothes cannot be well soaked, resulting in waste.

[0006] Therefore, there is still a need for further improvement of drum washing machines. Summary of the invention

[0007] In order to overcome one of the above disadvantages and / or other possible disadvantages in the prior art not mentioned herein, an object of the present invention is to provide an improved drum washing machine, a corresponding method for operating a drum washing machine and a corresponding computer program product.

[0008] According to a first aspect of the present invention, there is provided a drum washing machine, comprising: an outer drum; and an inner drum for receiving laundry to be washed, the inner drum being rotatably arranged in the outer drum; wherein the bottom wall of the outer drum comprises a displaceable portion which can be controllably displaced relative to the inner drum and accordingly locally adjust a gap between the outer drum and the inner drum.

[0009] According to an optional embodiment of the present invention, the drum washing machine is configured to be able to automatically adjust the gap through the displaceable part during operation.

[0010] According to an optional embodiment of the present invention, the displaceable portion is configured to reduce the gap.

[0011] According to an optional embodiment of the present invention, the displaceable portion is configured to be at least partially fit to the inner cylinder.

[0012] According to an optional embodiment of the present invention, the displaceable portion is configured to be able to move up and down.

[0013] According to an optional embodiment of the present invention, the outer cylinder comprises a cylinder body, the cylinder body is provided with an opening in a bottom area, and the displaceable part is connected to the cylinder body to close the opening.

[0014] According to an optional embodiment of the present invention, the opening is configured in a rectangular shape and is constructed symmetrically with respect to a vertical plane passing through a central axis of the outer cylinder.

[0015] According to an optional embodiment of the present invention, the drum washing machine further comprises a driving mechanism for driving the displaceable part.

[0016] According to an optional embodiment of the present invention, the displaceable part includes a main body part and a connecting part arranged around the main body part and connected to the main body part, the main body part is displaceably connected to the cylinder through the connecting part, and the driving mechanism acts on the main body part.

[0017] According to an optional embodiment of the present invention, the connecting portion has greater flexibility than the main body portion.

[0018] According to an optional embodiment of the present invention, the connecting portion is configured as a stretchable structure.

[0019] According to an optional embodiment of the present invention, the driving mechanism is configured as a linear driving mechanism.

[0020] According to an optional embodiment of the present invention, the driving mechanism is configured as one of the following: a cam mechanism, a worm gear mechanism, a connecting rod mechanism, a screw nut mechanism, and a linear motor.

[0021] According to an optional embodiment of the present invention, the driving mechanism further comprises a tray for supporting the main body part, and the tray is preferably connected to the main body part.

[0022] According to an optional embodiment of the present invention, the main body portion has an arc shape matching the shape of the cylinder.

[0023] According to an optional embodiment of the present invention, the displaceable portion is further provided with a through suction port leading to the gap, and the drum washing machine further comprises a pump fluidically connected to the suction port.

[0024] According to an optional embodiment of the present invention, the suction port is fluidly connected to the pump through a flexible tube to accommodate the displacement of the displaceable part.

[0025] According to an optional embodiment of the present invention, the displaceable portion is provided with a protruding annular sealing structure on the side facing the inner cylinder, the annular sealing structure is configured to be able to fit to the outer side of the inner cylinder to form a suction space, the suction port leads to the suction space, and the pump is configured to be able to suck gas and liquid.

[0026] According to a second aspect of the present invention, a method for operating a drum washing machine according to any of the above embodiments is provided, the method comprising a soaking stage, the soaking stage comprising at least the following steps: S1: displacing the displaceable portion toward the inner drum to locally reduce the gap between the outer drum and the inner drum; and S2: injecting water to soak the laundry.

[0027] According to an optional embodiment of the present invention, the soaking stage further includes the following step: heating the injected water.

[0028] According to a third aspect of the present invention, a method for operating a drum washing machine according to any of the above embodiments is provided, the method comprising a negative pressure dehydration stage, the negative pressure dehydration stage comprising at least the following steps: Sa: displacing the displaceable portion toward the inner drum and contacting the outer side of the inner drum to form a suction space; and Sb: sucking the suction space so that the air in the inner drum passes through the object to be dehydrated.

[0029] According to an optional embodiment of the present invention, the method further includes the following steps: after step Sb, displacing the displaceable part away from the inner cylinder to allow the inner cylinder to rotate in the outer cylinder; rotating the inner cylinder a predetermined number of times to change the posture of the object to be dehydrated in the inner cylinder; and then repeating steps Sa and Sb.

[0030] According to a fourth aspect of the present invention, a computer program product, in particular a computer-readable program carrier, is provided, which contains or stores computer program instructions, and when the computer program instructions are executed by a processor, the method according to any of the above embodiments is implemented.

[0031] According to certain exemplary embodiments of the present invention, negative pressure dehydration can be achieved by shifting the shiftable part without high-speed rotation of the drum, thereby simplifying the design and reducing noise, and also reducing water consumption and heating energy consumption during the soaking stage. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The present invention will be described in more detail below with reference to the accompanying drawings, so that the principles, features and advantages of the present invention can be better understood. The accompanying drawings include:

[0033] Figure 1 A front cutaway schematic diagram of a drum washing machine according to an exemplary embodiment of the present invention is shown.

[0034] Figure 2 Shows Figure 1 A side cutaway schematic diagram of a drum washing machine is shown.

[0035] Figure 3 Shows Figure 1 The outer drum of the drum washing machine shown in the figure is relative to the inner drum and Figure 1 A front cross-sectional schematic diagram of a working state compared to another different working state.

[0036] Figure 4 Shows Figure 3 A side cutaway schematic diagram of a drum washing machine is shown.

[0037] Figure 5 , Figure 6 The effect of a drive mechanism on a displaceable portion of an outer cylinder according to an exemplary embodiment of the present invention is shown in a front view and a perspective view, respectively.

[0038] Figure 7 A combination of a drive mechanism and a displaceable part according to an exemplary embodiment of the present invention is shown in a perspective view.

[0039] Figure 8 The stereogram shows Figure 7 The drive mechanism shown.

[0040] Fig. 9 Shows Figure 8 A side view of the drive mechanism is shown.

[0041] Fig.10 A possible cam mechanism is schematically shown as an example of a drive mechanism.

[0042] Fig.11 A possible worm gear mechanism is schematically shown as an example of a drive mechanism.

[0043] Fig.12 Shown separately Figure 7 A stereogram of the displaceable part in FIG.

[0044] Fig.13 Shows Fig.12 A cross-sectional view of the displaceable portion is shown.

[0045] Fig.14 A flowchart of a method for operating a drum washing machine according to an exemplary embodiment of the present invention is shown.

[0046] Fig.15 A flowchart of a method for operating a drum washing machine according to another exemplary embodiment of the present invention is shown. DETAILED DESCRIPTION

[0047] In order to make the technical problems, technical solutions and beneficial technical effects to be solved by the present invention clearer, the present invention will be further described in detail in conjunction with the accompanying drawings and multiple exemplary embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the scope of protection of the present invention, and each embodiment may share the same view or multiple views for description, but all features appearing in the same figure cannot be interpreted as features that must be possessed by an embodiment. On the contrary, as long as they are not mutually exclusive technically, they can be combined in any suitable manner. Moreover, for the sake of simplicity, different embodiments of different aspects may be presented in the same specific design, but such presentation does not mean that the embodiments of these aspects should appear together. The disassembly and / or combination of all possible embodiments and / or technical features should also take into account the description of the specification and the content that can be directly and unambiguously determined by those skilled in the art based on the description of the specification.

[0048] Before starting the description, it should be pointed out that, for the sake of convenience, this document may use position terms or direction terms for description, and the position terms or direction terms are relative to the normal use state of the drum washing machine. Those skilled in the art can clearly understand this from the description of the present invention without causing confusion. In this case, the position terms and direction terms should not be simply interpreted as the position or direction in any state.

[0049] Figure 1 A front cutaway schematic diagram of a drum washing machine according to an exemplary embodiment of the present invention is shown.

[0050] Figure 2 Shows Figure 1 A side cutaway schematic diagram of a drum washing machine is shown.

[0051] Figure 3 Shows Figure 1 The outer drum of the drum washing machine shown in the figure is relative to the inner drum and Figure 1 A front cross-sectional schematic diagram of a working state compared to another different working state.

[0052] Figure 4 Shows Figure 3 A side cutaway schematic diagram of a drum washing machine is shown.

[0053] like Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, according to one aspect of the present invention, there is provided a drum washing machine 1, which comprises: a non-rotating outer drum 11; and an inner drum 12 for receiving laundry to be washed, wherein the inner drum 12 is rotatably arranged in the outer drum 11; wherein the bottom wall of the outer drum 11 comprises a displaceable portion 111 which can be controllably displaced relative to the inner drum 12 and accordingly locally adjust a gap 13 between the outer drum 11 and the inner drum 12.

[0054] Those skilled in the art can understand that the present invention focuses on the bottom area of ​​the outer drum 11 of the drum washing machine 1 and the corresponding control method, and other parts are not the focus of the present invention. Therefore, for the sake of clarity and simplicity, other aspects are not described in detail. Any possible implementation of other aspects is feasible as long as it does not conflict with the technical idea of ​​the present invention. The present invention does not impose any limitation on this.

[0055] Here, the technical meaning of "controlledly" means that the displaceable part 111 is displaced under the instruction of active control intention, rather than the non-actively controlled displacement generated during the operation of the drum washing machine 1, for example, for shock absorption considerations or passive reasons. In particular, the "controlledly" of the present invention means that the controller (not shown) of the drum washing machine 1 actively issues corresponding control instructions to displace the displaceable part 111, with the purpose of correspondingly locally adjusting the gap 13 between the outer drum 11 and the inner drum 12. After reading the following description of the present invention, those skilled in the art can better understand this.

[0056] According to an exemplary embodiment of the present invention, the drum washing machine 1 is configured to automatically adjust the gap 13 during operation through the displaceable part 111. This can be well integrated into the automatic control of the drum washing machine 1, providing possibilities for various optimizations of the washing program.

[0057] According to an exemplary embodiment of the present invention, in particular by Figure 1 and Figure 2 Respectively Figure 3 and Figure 4 By comparison, it can be seen that the displaceable portion 111 is configured to reduce the gap 13. This can reduce the gap between the outer tub 11 and the inner tub 12 in this area as needed, so that, for example, when water needs to be added to soak clothes, especially when the clothes need to be heated, the reduced distance between the outer tub 11 and the inner tub 12 can reduce the amount of water used and correspondingly increase the heating speed to achieve a better soaking effect.

[0058] Further advantageously, the displaceable portion 111 is configured to be at least partially attached to the outer wall of the inner drum 12. Such attachment can minimize the distance between the outer drum 11 and the inner drum 12 in this area, and also provide the possibility of negative pressure dehydration for the drum washing machine 1. For example, when the outer peripheral area of ​​the displaceable portion 111 is attached, especially sealed to the corresponding area on the inner drum 12, negative pressure can be applied to the gap area between the middle part of the displaceable portion 111 and the inner drum 12 to extract water from the clothes, and the application of negative pressure will cause the air to flow out. Figure 4 The liquid flows through the clothes as shown by the arrows in the figure, thereby taking away the water in the clothes.

[0059] Of course, negative pressure dehydration can be used in conjunction with centrifugal spin dehydration, but it is more preferably used instead of centrifugal spin dehydration. Due to this negative pressure dehydration, high-speed rotation of the inner drum 12 is not required, so it has low noise, low energy consumption and small vibration. Moreover, negative pressure dehydration replaces high-speed centrifugal dehydration, which reduces the impact of the vibration of the drum, that is, the inner drum, on the machine and reduces the requirements for the strength of the whole machine. In addition, the drum does not require high-speed dehydration, which can reduce the strength design of the drum system, and the reinforcing ribs on the rear end surface of the drum can be optimized to save more space. In addition, it can also be understood that the drum does not require high-speed dehydration, and the vibration displacement of the drum will be smaller, which can reduce the safety distance between the drum and other systems, and provide space for increasing the volume of the drum or designing other systems.

[0060] The above describes the displacement characteristics of the displaceable portion 111. Obviously, as a method that is easy to implement, the displaceable portion 111 is configured to be able to move up and down to achieve the above displacement characteristics of the displaceable portion 111.

[0061] In the following, how to realize the displacement characteristic of the displaceable portion 111 of the outer cylinder 11 will be described in conjunction with some more specific exemplary embodiments.

[0062] According to an exemplary embodiment of the present invention, the outer cylinder 11 comprises a cylinder body 112, wherein the cylinder body 112 is provided with an opening 113 at a bottom area, and the displaceable part 111 is connected to the cylinder body 112 to close the opening 113. The cylinder body 112 can be understood as the main body of the outer cylinder 11.

[0063] Since the barrel 112 is discussed here, the working state of the displaceable portion 111 can be described by the position of the displaceable portion 111 relative to the barrel 112, for example, Figure 1 and Figure 2 As shown, from the end view, the displaceable portion 111 is roughly on the cylindrical contour of the drum body 112. At this time, the inner drum 12 maintains a certain safe distance from the outer drum 11, so that the inner drum 12 can rotate safely and perform normal washing operations. This position can be the default initial position.

[0064] According to an exemplary embodiment of the present invention, the opening 113 is configured as a rectangle and is constructed symmetrically with respect to a vertical plane passing through the central axis of the outer cylinder 11. In this case, the extension direction of the opening 113 is parallel to the central axis of the outer cylinder 11, and the symmetry axis of the opening 113 is exactly located on the vertical plane.

[0065] In order to be able to drive the displaceable portion 111, as Figure 1-Figure 4 As shown, the drum washing machine 1 may further include a driving mechanism 14 for driving the displaceable part 111. The control of the driving mechanism 14 may be performed by a corresponding program of the drum washing machine 1, thereby being integrated into a corresponding washing program.

[0066] As a more specific exemplary embodiment, Figure 1-Figure 4 As shown, the displaceable part 111 includes a main body part 1111 and a connecting part 1112 arranged around the main body part 1111 and connected to the main body part 1111, the main body part 1111 is displaceably connected to the cylinder 112 through the connecting part 1112, and the driving mechanism 14 acts on the main body part 1111.

[0067] In order to facilitate the movement of the displaceable part 111, the connecting part 1112 may have greater flexibility relative to the main part 1111. In this case, vibration decoupling can be achieved between the barrel 112 of the outer barrel 11 and the displaceable part 111, that is, the vibration generated by the outer barrel 11 will not be transmitted to the displaceable part 111, and vice versa.

[0068] In particular, the connecting portion 1112 may be configured as an expandable structure to adapt to the displacement of the main body portion 1111 relative to the cylinder 112. The expandable structure may be, for example, a corrugated structure or an elastic structure.

[0069] As described above, the displaceable portion 111 is configured to be able to move up and down, and for this purpose, the driving mechanism 14 can be correspondingly configured as a linear driving mechanism.

[0070] As the linear drive mechanism, there are illustrative examples of a cam mechanism, a worm gear mechanism, a connecting rod mechanism, a screw nut mechanism, a linear motor, and the like.

[0071] For example, Figure 5-Figure 6 The effect of the drive mechanism 14 on the displaceable portion 111 of the outer cylinder 11 according to an exemplary embodiment of the present invention is shown in a front view and a perspective view, respectively.

[0072] To make it clearer, Figure 7 The combination of the drive mechanism 14 and the displaceable part 111 according to an exemplary embodiment of the present invention is shown in a perspective view.

[0073] Figure 8 The stereogram shows Figure 7 The drive mechanism 14 is shown. Fig. 9 Shows Figure 8 A side view of the drive mechanism 14 is shown.

[0074] from Figure 5-Figure 9 It can be seen that the driving mechanism 14 further includes a tray 141 for supporting the main body portion 1111, and the tray 141 is preferably connected to the bottom of the main body portion 1111. By supporting the main body portion 1111 with the tray 141, the up and down displacement of the displaceable portion 111 can be better controlled, and in particular, by connecting the tray 141 to the main body portion 1111, the displacement of the displaceable portion 111 can be precisely controlled by the driving mechanism 14.

[0075] like Figure 8 As shown, four protrusions are provided at the four corners above the tray 141 , and these protrusions respectively support the four corners of the tray 141 and can be fixed to the tray 141 by, for example, screws.

[0076] Since the barrel 112 is cylindrical as a whole, it is advantageous if Figure 7 As shown, the main body portion 1111 has an arc shape matching the shape of the barrel 112 .

[0077] As mentioned above, when the displaceable portion 111 is partially attached to the outer wall of the inner drum 12, negative pressure dehydration can be performed. For this purpose, the displaceable portion 111 is also provided with a through suction port 1113 connected to the gap 13. The drum washing machine 1 also includes a pump 15 fluidly connected to the suction port 1113, which can be used to remove the water from the inner drum 12. Figure 1-Figure 4 As can be seen, especially Figure 4 As shown by the arrow in the figure, the water in the clothes can be pumped out by the pump 15. Obviously, those skilled in the art will understand that the suction port 1113 can also be used to discharge the water in the outer drum 11 after the normal washing process is completed, and then the displaceable part 111 is displaced to the inner drum 12 to perform the above-mentioned negative pressure dehydration. Before the negative pressure dehydration, centrifugal spin dehydration can be performed first, or negative pressure dehydration can be performed after centrifugal spin dehydration, or only negative pressure dehydration can be performed directly. Centrifugal dehydration requires that the displaceable part 111 is at a certain safety distance from the inner drum 12.

[0078] Especially if Figure 1 and Figure 3 As shown, according to an exemplary embodiment of the present invention, the suction port 1113 is fluidly connected to the pump 15 through the flexible tube 16 to accommodate the displacement of the displaceable portion 111. Moreover, the flexible tube 16 is also convenient for arrangement.

[0079] Especially if Figure 7As shown, the displaceable portion 111 is provided with a protruding annular sealing structure 1114 (also referred to as a lip) on the side facing the inner tube 12, and the annular sealing structure 1114 is configured to be able to fit to the outer side of the inner tube 12 to form a suction space 17 (see Figure 3 and Figure 4 ), the suction port 1113 leads to the suction space 17, and the pump 15 is configured to be able to suck gas and liquid.

[0080] The displaceable part 111 can be integrally formed, for example, by rubber. As for the connection between the connecting part 1112 of the displaceable part 111 and the barrel 112, any suitable method can be adopted, and the present invention does not impose any limitation on this.

[0081] from Figure 6-Figure 9 It can be seen that this driving mechanism 14 adopts a connecting rod mechanism, which drives the gear to rotate through the motor, and then drives a rod to swing through the gear meshing. Since the rod is pivotally connected to another rod in the middle area, the other rod will also move in coordination, so that the tray 141 can move up and down. Those skilled in the art can understand that the two rods have a total of four ends, one end of one of the rods is driven by the motor as described above, and the other three ends can slide in the corresponding slide grooves, so that the angle between the two rods can be changed to complete the above-mentioned lifting operation. This driving mechanism 14 is commonly found on various lifting platforms. Here, it will not be repeated.

[0082] As mentioned above, the driving mechanism 14 is not limited to the above-mentioned link mechanism. Fig.10 A possible cam mechanism is shown as an example of a drive mechanism 14, Fig.11 A possible worm gear mechanism is shown as an example of a drive mechanism 14 .

[0083] In addition, in order to more clearly show Figure 7 The displaceable portion 111 in Fig.12 Shown separately Figure 7 A perspective view of the displaceable portion 111 in FIG. Fig.13 Shows Fig.12 1 and 2. The cross-sectional view of the displaceable portion 111 is shown. From these figures in conjunction with the above description, a better understanding can be obtained.

[0084] According to an exemplary embodiment of the present invention, the driving mechanism 14 may be arranged on the housing of the drum washing machine 1 .

[0085] Although it is mentioned above that the operation of the drum washing machine 1 can be controlled by combining the displacement of the displaceable part 111, for a more specific purpose, such as Fig.14As shown, another aspect of the present invention further provides a method for operating the above-mentioned drum washing machine 1, the method comprising a soaking stage, and the soaking stage may at least include the following steps: S1: displacing the displaceable part 111 toward the inner drum 12, especially at least partially fitting to the inner drum 12, so as to locally reduce the gap 13 between the outer drum 11 and the inner drum 12; and S2: injecting water to soak the laundry.

[0086] As mentioned above, the steeping phase may also include the step of heating the injected water.

[0087] Likewise, for more specific purposes, such as Fig.15 As shown, another aspect of the present invention provides a method for operating the above-mentioned drum washing machine 1, the method including a negative pressure dehydration stage, and the negative pressure dehydration stage includes at least the following steps: Sa: displacing the displaceable part 111 toward the inner drum 12 and contacting the outer side of the inner drum 12 to form a suction space 17; and Sb: sucking the suction space 17 to allow the air in the inner drum 12 to pass through the object to be dehydrated.

[0088] According to an exemplary embodiment of the present invention, the method further includes the following steps: after step Sb, displacing the displaceable portion 111 away from the inner cylinder 12 (for example, to a safe distance) to allow the inner cylinder 12 to rotate in the outer cylinder 11; rotating the inner cylinder 12 a predetermined number of times to change the posture of the object to be dehydrated in the inner cylinder 12; and then repeating steps Sa and Sb.

[0089] By repeating the dehydration process for many times, a better dehydration effect can be achieved.

[0090] It is obvious to those skilled in the art that Fig.14 and Fig.15 The method shown can be incorporated into the washing program of the drum washing machine 1. For example, the two methods can be implemented at different stages in a complete washing process, which is very advantageous.

[0091] According to yet another aspect of the present invention, a computer program product, in particular a computer-readable program carrier, is provided, which contains or stores computer program instructions. When the computer program instructions are executed by a processor, the method according to any of the above embodiments is implemented.

[0092] Although specific embodiments have been described above, these embodiments are not intended to limit the scope of the present disclosure, even when only a single embodiment is described with respect to specific features. The feature examples provided in the present disclosure are intended to be illustrative, not limiting, unless otherwise expressly stated. In specific implementations, multiple features can be combined with each other where technically feasible, depending on actual needs. Various substitutions, changes, and modifications may also be conceived without departing from the spirit and scope of the present invention.

Claims

1. A drum washing machine (1), comprising: outer cylinder(11); and An inner drum (12) for receiving objects to be washed, the inner drum (12) being rotatably arranged in the outer drum (11); The bottom wall of the outer cylinder (11) comprises a displaceable portion (111) which can be controllably displaced relative to the inner cylinder (12) to correspondingly locally adjust the gap (13) between the outer cylinder (11) and the inner cylinder (12).

2. The drum washing machine (1) according to claim 1, characterized in that: The drum washing machine (1) is configured to be able to automatically adjust the gap (13) through the displaceable part (111) during operation.

3. The drum washing machine (1) according to claim 1 or 2, characterized in that: The displaceable portion (111) is configured to reduce the gap (13).

4. The drum washing machine (1) according to claim 3, characterized in that: The displaceable portion (111) is configured to be at least partially fit to the inner cylinder (12).

5. The drum washing machine (1) according to any one of claims 1 to 4, characterized in that: The displaceable portion (111) is configured to be able to move up and down.

6. The drum washing machine (1) according to any one of claims 1 to 5, characterized in that: The outer cylinder (11) comprises a cylinder body (112) provided with an opening (113) in a bottom area, and the displaceable part (111) is connected to the cylinder body (112) to close the opening (113).

7. The drum washing machine (1) according to claim 6, characterized in that: The opening (113) is configured in a rectangular shape and is constructed symmetrically with respect to a vertical plane passing through a central axis of the outer cylinder (11).

8. The drum washing machine (1) according to any one of claims 1 to 7, characterized in that: The drum washing machine (1) further comprises a driving mechanism (14) for driving the displaceable part (111).

9. The drum washing machine (1) according to claim 8, characterized in that: The displaceable part (111) comprises a main body part (1111) and a connecting part (1112) arranged around the main body part (1111) and connected to the main body part (1111); the main body part (1111) is displaceably connected to the cylinder (112) via the connecting part (1112); and the driving mechanism (14) acts on the main body part (1111).

10. The drum washing machine (1) according to claim 9, characterized in that: The connecting portion (1112) has greater flexibility than the main body portion (1111); and / or The connecting portion (1112) is configured as a stretchable structure; and / or The drive mechanism (14) is configured as a linear drive mechanism.

11. The drum washing machine (1) according to claim 10, characterized in that: The driving mechanism (14) is configured as one of the following: a cam mechanism, a worm gear mechanism, a connecting rod mechanism, a screw nut mechanism, a linear motor; and / or The driving mechanism (14) further comprises a tray (141) for supporting the main body portion (1111), and the tray (141) is preferably connected to the main body portion (1111).

12. The drum washing machine (1) according to any one of claims 9 to 11, characterized in that: The main body portion (1111) has an arc shape matching the shape of the cylinder (112).

13. The drum washing machine (1) according to any one of claims 1 to 12, characterized in that: The displaceable portion (111) is also provided with a through suction port (1113) leading to the gap (13), and the drum washing machine (1) further comprises a pump (15) fluidically connected to the suction port (1113).

14. The drum washing machine (1) according to claim 13, characterized in that: The suction port (1113) is fluidically connected to the pump (15) through a flexible tube (16) to accommodate the displacement of the displaceable portion (111).

15. The drum washing machine (1) according to claim 14, characterized in that: The displaceable portion (111) is provided with a protruding annular sealing structure (1114) on the side facing the inner tube (12); the annular sealing structure (1114) is configured to be able to fit onto the outer side of the inner tube (12) to form a suction space (17); the suction port (1113) leads to the suction space (17); and the pump (15) is configured to be able to suck gas and liquid.

16. A method for operating a drum washing machine (1) according to any one of claims 1 to 15, the method comprising a soaking phase, the soaking phase comprising at least the following steps: S1: displacing the displaceable portion (111) toward the inner cylinder (12) to locally reduce the gap (13) between the outer cylinder (11) and the inner cylinder (12); and S2: Pour water to soak the laundry.

17. The method according to claim 16, characterized in that The soaking stage also includes the following steps: The injected water is heated.

18. A method for operating a drum washing machine (1) according to any one of claims 1 to 15, the method comprising a negative pressure dehydration stage, the negative pressure dehydration stage comprising at least the following steps: Sa: displacing the displaceable portion (111) toward the inner cylinder (12) to contact the outer side of the inner cylinder (12) to form a suction space (17); and Sb: The suction space (17) is sucked to allow the air in the inner cylinder (12) to pass through the object to be dehydrated.

19. The method according to claim 18, characterized in that The method further comprises the following steps: After step Sb, the displaceable portion (111) is displaced away from the inner cylinder (12) to allow the inner cylinder (12) to rotate within the outer cylinder (11); Rotating the inner drum (12) a predetermined number of times to change the posture of the object to be dehydrated in the inner drum (12); and Then repeat steps Sa and Sb.

20. A computer program product, in particular a computer-readable program carrier, comprising or storing computer program instructions, which, when executed by a processor, implement the method according to any one of claims 16 to 19.

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