A drum washing machine and a control method of the drum washing machine

Abstract

The application discloses a drum washing machine and a control method of the drum washing machine. The drum washing machine comprises a shell and an inner drum arranged in the shell. The shell is provided with a laundry putting opening, and a machine door is arranged at the laundry putting opening and can be opened and closed. The inner drum is provided with an inner drum opening, and an inner drum door is arranged at the inner drum opening and can be opened and closed. The inner drum door in the open position is provided with a detection device at a position where the inner drum door is in contact with the machine door. The detection device is triggered by the inner drum door or the machine door at the position where the inner drum door is in contact with the machine door, and a trigger signal is generated. The detection device senses the automatic opening of the inner drum door by being arranged at the position where the inner drum door in the open position is in contact with the machine door, and the detection of the incomplete closing of the inner drum door is realized. The application further provides a control method of the drum washing machine. The detection device is triggered and a trigger signal is generated when the inner drum door is closed. The detection device is released from the trigger and no trigger signal is generated under the action of the automatically opened inner drum door.

Description

Technical Field

[0001] This invention belongs to the field of household appliance technology, specifically, it relates to a drum washing machine and a control method for the drum washing machine. Background Technology

[0002] Washing machines, as one of the most widely used household appliances in people's daily lives, have helped people get rid of the trouble of laundry and brought great convenience to their lives. However, existing washing machines generally consist of an outer drum and an inner drum that is rotatably located inside the outer drum. The inner drum has multiple dewatering holes distributed on its wall. During the washing process, the washing water between the inner and outer drums is not utilized, resulting in waste of washing water between the inner and outer drums. Furthermore, dirt generated by the clothes during the washing process will enter the space between the inner and outer drums with the water flow and accumulate there. With prolonged use of the washing machine, the accumulation of dirt between the inner and outer drums will seriously affect the washing effect of the clothes, thereby reducing the user experience.

[0003] To address the aforementioned problems, a drum washing machine with a non-perforated inner drum has been developed. The inner drum opening is fitted with an openable / closable inner drum door, creating an independent internal chamber for holding wash water. During washing and rinsing, the wash water is contained within the inner drum, eliminating water between the inner and outer drums and resolving the issue of dirt accumulation between them, while also saving water consumption. As the structural characteristics of this non-perforated drum washing machine indicate, maintaining the airtightness of the inner drum door during washing and rinsing is crucial for creating this independent internal chamber. Furthermore, during the high-speed spin-drying process, if the inner drum door is not locked or not properly locked, it could lead to serious safety hazards. Therefore, detecting the proper closure of the inner drum door is critical for the normal operation of this non-perforated drum washing machine.

[0004] In view of this, the present invention is proposed. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a drum washing machine and a control method for the drum washing machine. By setting a detection device at the position where the inner drum door is in the open position and in contact with the machine door, the detection device can sense the automatic opening of the inner drum door, thereby achieving the purpose of detecting that the inner drum door is not closed properly.

[0006] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by the present invention is as follows:

[0007] The present invention provides a drum washing machine, including an outer shell and an inner drum disposed inside the outer shell. The outer shell has a clothes loading port with a door that can be opened and closed. The inner drum has an inner drum opening with a door that can be opened and closed. A detection device is provided at the position where the inner drum door is in the open position and contacts the machine door. The detection device is triggered by the action of the inner drum door or the machine door at the contact position and generates a trigger signal.

[0008] Furthermore, the detection device is located on the inner cylinder door or the machine door, and the detection device has a pressing part, at least part of which is exposed on the side of the inner cylinder door facing the machine door or on the side of the machine door facing the inner cylinder door.

[0009] Furthermore, when the inner cylinder door is in the minimum open position and in contact with the machine door when the machine door is closed, a first contact point is formed on the machine door. When the inner cylinder door is in the maximum open position and in contact with the machine door when the machine door is fully open, a second contact point is formed on the machine door. The pressing part exposed on the machine door covers the area between the first and second contact points.

[0010] Furthermore, the detection device includes a press triggering component and a pressure switch. The press triggering component includes an axially extending cylindrical sliding portion, a radially extending pressing portion formed by the end wall of the cylindrical sliding portion protruding towards the inner cylinder door, and a triggering portion formed by the top of the outer periphery of the cylindrical sliding portion protruding upward to trigger the pressure switch.

[0011] Furthermore, the cross-section of the trigger part in the vertical direction is triangular, and the side corresponding to one right-angled side of the trigger part is located on the top of the outer periphery of the sliding part. The side corresponding to the hypotenuse of the trigger part faces the inner cylinder door, and the side corresponding to the hypotenuse of the trigger part is arc-shaped and protrudes towards the inner cylinder door.

[0012] Furthermore, the pressure switch includes a square mounting portion disposed on the top of the cylindrical sliding portion and a sensing portion disposed on the bottom wall of the square mounting portion. The sensing portion extends toward the trigger portion. The top of the trigger portion triggers the sensing portion at the bottom of the sensing portion, or the top of the trigger portion slides axially past the sensing portion and releases the trigger from the sensing portion.

[0013] Furthermore, the detection device also includes a strip elastic sheet, which gradually slopes from top to bottom toward the inner cylinder door. The top end of the strip elastic sheet is located on one side of the square mounting part, and the bottom end is clamped between the top of the trigger part and the sensing part. The strip elastic sheet presses against the trigger sensing part under the support of the top of the trigger part, or the strip elastic sheet disengages from the support of the top of the trigger part and the sensing part to release the trigger.

[0014] Furthermore, the strip elastic sheet, the sensing part, and the triggering part are distributed sequentially from the outside to the inside of the inner cylinder. The sensing part extends downward beyond the top of the triggering part. The upper side of the strip elastic sheet covers the sensing part. The corner at the top of the triggering part and the outer periphery of the sensing part clamp the end of the strip elastic sheet.

[0015] Furthermore, the machine door is hollow to form a cavity, and an annular support component coaxial with the machine door is provided in the cavity. The pressure switch is fixed on the annular support component. The annular support component has two protrusions distributed vertically on the side facing the inner cylinder door. The cylindrical sliding part is sandwiched between the two protrusions and slides between the two protrusions. At least part of the pressing part is embedded in the cavity.

[0016] The present invention also provides a control method for a drum washing machine, which adopts the drum washing machine provided by the above technical solution; the detection device is triggered and generates a trigger signal when the inner drum door is closed, and the detection device is detrimental and does not generate a trigger signal when the inner drum door is automatically opened.

[0017] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0018] By installing a detection device at the point where the inner cylinder door is in the open position and in contact with the machine door, the detection device senses the automatic opening of the inner cylinder door and realizes the detection of the inner cylinder door not being closed properly.

[0019] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0020] The accompanying drawings, as part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments and descriptions of the invention are used to explain the invention, but do not constitute an undue limitation of the invention. Obviously, the drawings described below are merely some embodiments, and those skilled in the art can obtain other drawings based on these drawings without creative effort. In the drawings:

[0021] Figure 1 This is a schematic diagram of the structure of a drum washing machine provided in an embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram showing the positions of the first and second points formed on the machine door according to an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the assembly of the annular support member and the pressure switch provided in an embodiment of the present invention;

[0024] Figure 4 yes Figure 3 Enlarged view at point C;

[0025] Figure 5 This is a schematic diagram of the assembly of the outer frame, the annular support member, and the pressure switch provided in an embodiment of the present invention;

[0026] Figure 6 yes Figure 5 Enlarged view at point B;

[0027] Figure 7 This is a schematic diagram of the pressure switch provided in an embodiment of the present invention;

[0028] Figure 8 This is a schematic diagram of the structure of the annular support member provided in an embodiment of the present invention;

[0029] Figure 9 yes Figure 8 Enlarged view at point A.

[0030] Icons: 1-Outer shell; 11-Front panel; 12-Door; 121-Inner frame; 122-Outer frame; 2-Inner cylinder; 21-Inner cylinder door; 2-Detection device; 21-Pressing component; 211-Cylindrical sliding part; 212-Pressing part; 213-Claw; 2131-Connecting arm; 2132-Claw part; 22-Triggering component; 221-Triggering part; 23-Pressure switch; 231-Square mounting part; 232-Sensing part; 233-Strip elastic sheet; 3-Annular support; 31-Protrusion; 311-Sliding mounting hole; 32-Through hole; 33-Guide part; 34-Fixing part; 4-Support frame.

[0031] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the invention in any way, but rather to illustrate the concept of the invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0033] In the description of this invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0034] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0035] like Figure 1 , Figure 2 and Figure 3 As shown, the present invention provides a drum washing machine, including a shell 1 and an inner drum 2 disposed inside the shell 1. The shell 1 has a clothes loading port with a door 12 that can be opened and closed. The inner drum 2 has an inner drum door 21 that can be opened and closed. A detection device 2 is provided at the position where the inner drum door 21 is in the open position and contacts the door 12. The detection device 2 is triggered by the action of the inner drum door 21 or the door 12 at the contact position and generates a trigger signal.

[0036] In an embodiment of the present invention, a detection device 2 is provided at the position where the inner cylinder door 21 is in the open position and in contact with the machine door 12. The detection device 2 senses the automatic opening of the inner cylinder door 21, thereby detecting whether the inner cylinder door 21 is not closed properly.

[0037] The drum washing machine includes an outer shell 1 and an inner drum 2 rotatably disposed inside the outer shell 1. The outer shell 1 has a front panel 11 with a clothes inlet on the front panel 11 and a door 12 for opening and closing the clothes inlet. The inner drum 2 has an inner drum opening 2 and an inner drum door 21 for opening and closing the inner drum opening 2. The inner drum door 21 is positioned opposite the door 12. The inner drum 2 can independently hold washing water when washing clothes. The inner drum door 21 closes the inner drum opening 2 when the inner drum 2 rotates to wash clothes.

[0038] The control method for this drum washing machine includes: when washing clothes, the inner drum 2 rotates and the inner drum door 21 closes to seal the inner drum 2. The inner drum 2 drives the inner drum door 21 to rotate. The detection device 2 is triggered when the inner drum door 21 is closed and generates a trigger signal. If the detection device 2 continuously generates a trigger signal, it indicates that the inner drum door 21 is always in the closed state when the inner drum 2 rotates to wash clothes.

[0039] During the washing process, the clothes inside the inner drum 2 may be eccentric, causing the inner drum 2 to rotate unstablely. This may cause the inner drum door 21 to open automatically, or the user may not close the inner drum door 21 properly. Once opened, the inner drum door 21 will impact the machine door 12. The detection device 2 will be deactivated by the impact of the inner drum door 21 and will not generate a trigger signal. If the detection device 2 does not sense a trigger signal, it means that the inner drum door 21 is open and not closed properly.

[0040] like Figure 1 As shown, in an embodiment of the present invention, the detection device 2 is disposed on the inner cylinder door 21 or the machine door 12. The detection device 2 has a pressing part 212, at least part of which is exposed on the side of the inner cylinder door 21 facing the machine door 12 or on the side of the machine door 12 facing the inner cylinder door 21.

[0041] In embodiments of the present invention, the detection device 2 can be installed on the inner cylinder door 21 or on the machine door 12, which increases the range of installation positions of the detection device 2. Depending on the ease of installation and disassembly of the detection device 2 and the sensitivity of the trigger signal generated by the detection device 2 after impact, the detection device 2 can be installed on the machine door 12 or the inner cylinder door 21.

[0042] The detection device 2 has a pressing part 212, at least part of which is exposed outside the machine door 12 or the inner cylinder door 21. The pressing part 212 is used to receive the impact of the inner cylinder door 21, so that the detection device 2 is deactivated and does not generate a trigger signal.

[0043] like Figure 1 and Figure 2 As shown, specifically, when the inner cylinder door 21 is in the minimum open position and in contact with the machine door 12 when the machine door 12 is closed, a first contact point is formed on the machine door 12 that contacts the inner cylinder door 21. When the inner cylinder door 21 is in the maximum open position and in contact with the machine door 12 when the machine door 12 is fully open, a second contact point is formed on the machine door 12 that contacts the inner cylinder door 21. The pressing part 212 exposed on the machine door 12 covers the area between the first and second contact points.

[0044] The detection device 2 is installed on the machine door 12. When the inner cylinder door 21 impacts and contacts the machine door 12, it involves the inner cylinder door 21 in the minimum open position contacting the machine door 12 and the inner cylinder door 21 in the maximum open position contacting the machine door 12. When the machine door 12 is closed, the inner cylinder door 21 has a minimum opening angle in order to contact the machine door 12, and at this time, the inner cylinder door 21 is considered to be in the minimum open position. When the machine door 12 is fully open, the inner cylinder door 21 has a maximum opening angle in order to contact the machine door 12, and at this time, the inner cylinder door 21 is considered to be in the maximum open position.

[0045] The pressing part 212 exposed on the machine door 12 can accurately receive the impact pressing of the inner cylinder door 21 as long as it covers the area between the first point and the second point. The area covered by the pressing part 212 is greater than or equal to the area between the first point and the second point.

[0046] Preferably, when the inner cylinder door 21 is open normally and does not fall or misalign, the area between the first point and the second point extends radially and is located in the middle of the inner cylinder door 21 in the vertical direction, on the left side, with the first point being closer to the left edge of the inner cylinder door 21 relative to the second point.

[0047] like Figure 3 , Figure 4 and Figure 7 As shown, in an embodiment of the present invention, the detection device 2 includes a press trigger component 221 and a pressure switch 23. The press trigger component 221 includes an axially extending cylindrical sliding portion 211, a radially extending pressing portion 212 formed by the end wall of the cylindrical sliding portion 211 protruding toward the inner cylinder door 21, and a trigger portion 221 formed by the top of the outer periphery of the cylindrical sliding portion 211 protruding upward.

[0048] In an embodiment of the present invention, the press trigger part 221 includes a press component 21 and a trigger part 221 22. The press trigger part 221 includes an axially extending cylindrical sliding part 211, a press part 212, and a trigger part 221. The press component 21 includes the cylindrical sliding part 211 and the press part 212. The trigger part 221 22 includes the trigger part 221. When the inner cylinder door 21 is closed, the cylindrical sliding part 211, the press part 212, and the trigger part 221 are in a first position, and the trigger part 221 triggers the pressure switch 23. The inner cylinder door 21 automatically opens and impacts the press part 212. The cylindrical sliding part 211 slides axially to a second position, simultaneously driving the press part 212 and the trigger part 221 to slide to the second position. The trigger part 221 is deactivated from the pressure switch 23.

[0049] The machine door 12 includes an inner frame 121 and an outer frame 122. The inner frame 121 and the outer frame 122 are interlocked to form a cavity. An annular support member 3 with the same circumference as the machine door 12 is provided in the cavity. The outer frame 122 is annular. The annular support member 3 is embedded in the through hole 32. The side of the annular support member 3 facing the inner door is attached to the inner frame 121. The side of the annular support member 3 facing away from the inner cylinder door 21 abuts against the door glass located outside the outer frame 122.

[0050] The cylindrical sliding part 211 is hollow inside. The end wall of one end of the cylindrical sliding part 211 protrudes towards the inner cylinder door 21 to form a pressing part 212. The pressing part 212 extends radially and has a long strip structure, which can cover the radially extended area formed between the first point and the second point, increasing the area impacted by the inner cylinder door 21.

[0051] The outer periphery of one end of the cylindrical sliding part 211 protrudes radially to form an annular protrusion, which protrudes toward the inner cylinder door 21 to form a hollow, elongated pressing part 212; the end of the annular protrusion facing away from the inner cylinder 2 is provided with a claw 213, which includes an axially extending connecting arm 2131 and a claw part 2132. The end of the connecting arm 2131 facing the inner cylinder door 21 is connected to the outer periphery of the cylindrical sliding part 211, and the other end is provided with a claw part 2132, which slides axially on the machine door 12;

[0052] The annular protrusion extends axially to the side facing away from the inner cylinder door 21 to form a connecting arm 2131, and there is a gap between the connecting arm 2131 and the cylindrical sliding part 211.

[0053] In addition to the following structures, the detection device 2 may also include a press trigger 221 and a pressure switch 23.

[0054] like Figure 8 and Figure 9 As shown, the annular support member 3 has two protrusions 31 distributed vertically on the side facing the inner cylinder door 21. Each protrusion 31 has a sliding mounting hole 311. The cylindrical sliding part 211 is clamped between the two protrusions 31. The claw part 2132 of the claw 213 is inserted into the sliding mounting hole 311 and slides within the sliding mounting hole 311.

[0055] The lower protrusion 31 is a radially extending strip, and the protrusion 31 has two radially distributed sliding mounting holes 311, one of which is directly opposite the upper sliding mounting hole 311; the bottom of the lower protrusion 31 is provided with a support rib to improve the support strength of the protrusion.

[0056] At least part of the pressing part 212 is embedded in the cavity on the side of the inner frame 121 toward the inner cylinder door 21, and the pressing part 212 can slide on the inner frame 121;

[0057] The annular support member 3 protrudes towards the inner cylinder door 21 to form a hollow guide part 33. One end of the cylindrical sliding part 211 is open. The cylindrical sliding part 211 is embedded in the guide part 33 and slides on the guide part 33. A return spring is provided inside the cylindrical sliding part 211. The return spring extends axially. One end of the return spring extends into the guide part 33 and connects with the annular support member 3. The other end is connected in the guide part 33 to provide a return force for the guide part 33. The guide part 33 is located between two positioning protrusions arranged vertically.

[0058] The trigger part 221 has a triangular cross-section in the vertical direction. The side of the trigger part 221 corresponding to one right-angled side is located on the top of the outer periphery of the sliding part. The side of the trigger part 221 corresponding to the hypotenuse faces the inner cylinder door 21. The side of the trigger part 221 corresponding to the hypotenuse is arc-shaped and protrudes towards the inner cylinder door 21.

[0059] like Figure 3 , Figure 4 and Figure 7 As shown, in an embodiment of the present invention, the pressure switch 23 includes a square mounting portion 231 disposed on the top of the cylindrical sliding portion 211 and a sensing portion 232 disposed on the bottom wall of the square mounting portion 231. The sensing portion 232 extends toward the side of the trigger portion 221. The top of the trigger portion 221 triggers the sensing portion at the bottom of the sensing portion 232, or the top of the trigger portion 221 slides axially past the sensing portion and releases the trigger from the sensing portion.

[0060] In an embodiment of the present invention, when the inner cylinder door 21 is closed, the cylindrical sliding part 211, the pressing part 212, and the trigger part 221 are in the first position, and the top of the trigger part 221 triggers the sensing part at the bottom of the sensing part 232; the inner cylinder door 21 automatically opens and impacts the pressing part 212, the cylindrical sliding part 211 slides axially to the second position, and at the same time drives the pressing part 212 and the trigger part 221 to slide to the second position, and the top of the trigger part 221 slides axially past the sensing part 232 and de-triggers the sensing part 232;

[0061] The detection device 2 also includes a strip elastic sheet 233, which gradually slopes from top to bottom toward the inner cylinder door 21. The top end of the strip elastic sheet 233 is located on one side of the square mounting part 231, and the bottom end is clamped between the top of the trigger part 221 and the sensing part. The strip elastic sheet 233 is supported by the top of the trigger part 221 and presses against the trigger sensing part, or the strip elastic sheet 233 is released from the support of the top of the trigger part 221 and the sensing part.

[0062] Furthermore, the strip elastic sheet 233, the sensing part 232 and the trigger part 221 are distributed sequentially along the outer side to the inner side of the inner cylinder 2. The sensing part extends downward beyond the top of the trigger part 221. The upper side of the strip elastic sheet 233 covers the sensing part. The corner of the top of the trigger part 221 and the outer periphery of the sensing part clamp the end of the strip elastic sheet 233.

[0063] The triggering part 221 triggers the sensing part 232 using a strip elastic sheet 233. The sensing part 232 is columnar, and the sensing part at the bottom of the sensing part is hemispherical. The upper side of the strip elastic sheet 233 wraps around the sensing part along the direction from the outside to the inside of the inner cylinder 2. The sensing part 232 overlaps with the top of the triggering part 221, and the end of the strip elastic sheet 233 is clamped in the overlapping part.

[0064] When pressure switch 2 is triggered, trigger part 221 supports strip elastic sheet 233, and sensing part 232 presses down on strip elastic sheet 233. Strip elastic sheet 233 squeezes sensing part, so that sensing part is continuously triggered. When pressure switch 2 is de-triggered, the top of trigger part 221 squeezes strip elastic sheet 233 to slide, trigger part 221 changes position, releases the clamping of strip elastic sheet 233, strip elastic sheet 233 disengages from sensing part, so that sensing part is de-triggered.

[0065] Since the cross-section of the trigger part 221 in the vertical direction is triangular, the trigger part 221 can be separated from the sensing part 232 as quickly as possible.

[0066] like Figure 5 , Figure 6 , Figure 8 and Figure 9 As shown, the annular support 3 has a through hole 32, and the pressure switch 23 also includes a support frame 4. The support frame 4 includes a first mounting plate and a second mounting plate. The first mounting plate is fixed to the side of the annular support 3 facing the inner cylinder door 21 via a fixing part 34. A square mounting part 231 is provided on one side of the second mounting plate. The second mounting plate passes through the through hole 32. The support frame 4 supports the pressure switch 23 and improves the stability of the pressure switch 23. The fixing part 34 is a fixing hole. The through hole 32 is located above all the protrusions.

[0067] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present invention. The implementation schemes in the above embodiments can also be further combined or replaced. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A drum washing machine, comprising a casing and an inner drum disposed within the casing, wherein the casing has a clothes loading opening with a closable door, and the inner drum has an inner drum opening with a closable inner drum door, characterized in that, A detection device is installed at the point where the inner cylinder door in the open position contacts the machine door. The detection device is triggered by the action of the inner cylinder door or the machine door at the point of contact and generates a trigger signal. The detection device is located on the inner cylinder door or the machine door. The detection device has a pressing part, at least part of which is exposed on the side of the inner cylinder door facing the machine door or on the side of the machine door facing the inner cylinder door. When the inner cylinder door is in the minimum open position and in contact with the machine door when the machine door is closed, a first contact point is formed on the machine door. When the inner cylinder door is in the maximum open position and in contact with the machine door when the machine door is fully open, a second contact point is formed on the machine door. The pressing part exposed on the machine door covers the area between the first and second contact points.

2. The drum washing machine according to claim 1, characterized in that, The detection device includes a press triggering component and a pressure switch. The press triggering component includes an axially extending cylindrical sliding part, a radially extending pressing part formed by the end wall of the cylindrical sliding part protruding towards the inner cylinder door, and a triggering part formed by the top of the outer periphery of the cylindrical sliding part protruding upward to trigger the pressure switch.

3. The drum washing machine according to claim 2, characterized in that, The cross-section of the trigger part in the vertical direction is triangular. The side of the trigger part corresponding to one right-angled side is located on the top of the outer periphery of the sliding part. The side of the trigger part corresponding to the hypotenuse faces the inner cylinder door. The side of the trigger part corresponding to the hypotenuse is arc-shaped and protrudes towards the inner cylinder door.

4. The drum washing machine according to claim 2, characterized in that, The pressure switch includes a square mounting part located at the top of the cylindrical sliding part and a sensing part located at the bottom wall of the square mounting part. The sensing part extends toward the triggering part. The top of the triggering part triggers the sensing part at the bottom of the sensing part, or the top of the triggering part slides axially past the sensing part and releases the trigger from the sensing part.

5. The drum washing machine according to claim 4, characterized in that, The detection device also includes a strip elastic sheet, which gradually slopes from top to bottom toward the inner cylinder door. The top of the strip elastic sheet is located on one side of the square mounting part, and the bottom end is clamped between the top of the trigger part and the sensing part. The strip elastic sheet presses against the trigger sensing part under the support of the top of the trigger part, or the strip elastic sheet detaches from the support of the top of the trigger part and the sensing part to release the trigger.

6. The drum washing machine according to claim 5, characterized in that, The strip elastic sheet, the sensing part, and the triggering part are distributed sequentially from the outside to the inside of the inner cylinder. The sensing part extends downward beyond the top of the triggering part. The upper side of the strip elastic sheet covers the sensing part. The corner of the top of the triggering part and the outer periphery of the sensing part clamp the end of the strip elastic sheet.

7. The drum washing machine according to any one of claims 1-6, characterized in that, The machine door is hollow to form a cavity. A ring-shaped support is provided in the cavity, which is coaxial with the machine door. The pressure switch is fixed on the ring-shaped support. The ring-shaped support has two protrusions distributed vertically on the side facing the inner cylinder door. The cylindrical sliding part is sandwiched between the two protrusions and slides between the two protrusions. At least part of the pressing part is embedded in the cavity.

8. A control method for a drum washing machine, characterized in that, The drum washing machine according to any one of claims 1-7 is used; the detection device is triggered and generates a trigger signal when the inner drum door is closed, and the detection device is deactivated and does not generate a trigger signal when the inner drum door is automatically opened.

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