A drum washing machine and its control method

Abstract

This invention discloses a drum washing machine and its control method. The drum washing machine includes: a drum that can independently hold washing water; and a wireless water level detection device installed inside the drum to detect the water level of the washing water inside the drum. The drum washing machine provided by this invention solves the problem of difficult water level detection in drum washing machines with non-perforated inner drums by using wireless water level sensing technology. This method is not only accurate but also easy to implement and has wider applicability. During the water filling process, by controlling the rotation of the drum, the wireless water level detection device is ensured to be at the bottom of the drum, making the measurement results of the wireless water level detection device more accurate and solving the problems of complex and inaccurate washing water level detection procedures in existing drum washing machines.

Description

Technical Field

[0001] This invention relates to the field of laundry equipment technology, and in particular to a drum washing machine and its control method. Background Technology

[0002] Existing front-loading washing machines, such as Figure 1 As shown, water level detection is achieved by constructing an air chamber 100, which is connected to the outer drum 2 of the washing machine. The pressure generated by the water level in the outer drum 2 is transmitted to the air chamber 100. The pressure inside the air chamber 100 is transmitted to the water level sensor 300 through the pressure guide pipe 200. The water level sensor 300 is connected to the control board via wires to transmit signals. This detection scheme requires that there is water in the outer drum 2. During the use of washing machines, more and more users have found that household fully automatic washing machines are generally composed of inner and outer drums. Due to the frequent flow of water between the inner and outer drums, after continuous use, the area between the side walls of the inner and outer drums becomes a space for dirt and grime to accumulate. Scale from tap water, loose detergent residue, cellulose from clothing, organic matter from the human body, and dust and bacteria brought in by clothing can easily remain between the side walls of the inner and outer drums. A layer of black and sticky dirt and grime will accumulate in the space between the inner and outer drums, becoming a breeding ground for bacteria.

[0003] To solve the above problems, it is necessary to eliminate the secondary pollution of clothes by dirt between the inner and outer drums, which requires the development of a washing machine with a non-perforated inner drum.

[0004] Patent application number 201510776031.0 discloses a water level detection structure and washing machine for a waterless drum washing machine: The inner drum has multiple water-spraying holes near its upper edge, and at least one inner drum drain outlet at its bottom. The outer drum has a telescopic drain valve at its bottom that can block the inner drum drain outlet. An air chamber is provided on the outer drum, and a pressure sensor is installed on the air chamber. The air chamber is connected to the inner drum through the telescopic drain valve, and the air chamber has a drain outlet to discharge water. While this disclosed washing machine avoids water stagnation between the inner drums and prevents dirt from adhering to the inner wall of the outer drum, it requires precise alignment between the drain valve and the drain outlet. After long-term use, wear and tear may cause positioning errors, making water level detection impossible. Therefore, existing water level detection schemes cannot accurately monitor the water level of a drum washing machine without holes.

[0005] In view of this, the present invention is hereby proposed. Summary of the Invention

[0006] 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 that solves the water level detection problem of drum washing machines without a perforated inner drum through wireless water level sensing technology. It is not only accurate in measurement, but also easy to implement and has greater applicability and scalability.

[0007] To achieve this objective, according to one aspect of the present invention, the present invention adopts the following technical solution:

[0008] A drum washing machine, comprising:

[0009] The drum can hold the washing water independently;

[0010] A wireless water level detection device is installed inside the drum to detect the water level of the washing water inside the drum.

[0011] Furthermore, the wireless water level detection device is disposed on the inner wall of the drum; preferably, the drum is provided with lifting ribs, and the wireless water level detection device is disposed inside the lifting ribs.

[0012] Furthermore, the peripheral sidewall of the roller is recessed outward to form a receiving groove, and the wireless water level detection device is fixedly installed in the receiving groove;

[0013] Preferably, the wireless water level detection device is placed in the receiving groove by means of snap-fit ​​and / or screw and / or adhesive;

[0014] More preferably, the peripheral wall of the roller has a lifting rib mounting area for mounting the lifting rib, and the receiving groove is formed by the outward indentation of the peripheral wall portion of the roller where the lifting rib mounting area is located.

[0015] Furthermore, the wireless water level detection device includes a water level detection module, which has a detection end facing the washing water inside the drum and a reference end communicating with the external atmospheric pressure. The receiving groove is provided with an air pressure communication hole that connects the reference end with the external atmospheric pressure of the drum.

[0016] Furthermore, the wireless water level detection device has a hollow cavity housing, the water level detection module is located inside the housing, the housing has a detection communication port and a reference communication port, the detection end of the water level detection module extends into the drum through the detection communication port, and the reference end is connected to the air pressure communication hole on the receiving groove through the reference communication port.

[0017] Furthermore, a sealing structure is provided between the housing and the inner wall of the receiving groove;

[0018] Preferably, the sealing structure is a sealing gasket disposed between the bottom surface of the housing and / or the side surface of the housing and the inner wall of the receiving groove.

[0019] Furthermore, the wireless water level detection device also includes a wireless receiving module and a wireless transmitting module located inside the housing. The wireless receiving module receives the detection command from the control unit of the washing machine and controls the water level detection module to detect the water level of the washing water in the drum. The wireless transmitting module sends the water level information detected by the water level detection module to the control unit of the washing machine.

[0020] Furthermore, it also includes an outer cylinder coaxially mounted and fitted outside the drum, the outer cylinder and the drum being respectively composed of a cylindrical outer cylinder sidewall and a drum sidewall;

[0021] The outer drum and the drum are provided with opposite openings on the same side to form the drum opening and the outer drum opening respectively. The opposite ends on the other side are sealed to form the drum bottom and the outer drum bottom respectively. During washing, the inside of the drum can independently hold the washing water.

[0022] Another objective of the present invention is to provide a control method for a drum washing machine having any of the above-described features. During the water intake phase of the washing / rinsing program, the wireless water level detection device detects the water level inside the drum and feeds back the water level information to the control unit of the washing machine. The control unit controls the opening and closing of the washing machine's water intake system based on the water level information.

[0023] Furthermore, the central axis of the roller is taken as the horizontal line:

[0024] After each washing / rinsing cycle, the control drum rotates to move the wireless water level detection device to the bottom of the drum's circumferential sidewall, and the drum is locked. When water is added next time, the wireless water level detection device is directly activated to detect the water level.

[0025] Alternatively, before the washing machine enters the water intake stage, the wireless water level detection device can be rotated to the bottom of the drum's circumferential side wall, the drum can be locked, and then the water intake system can be controlled to take in water while simultaneously activating the wireless water level detection device to begin water level detection.

[0026] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0027] 1. The drum washing machine provided by this invention solves the problem of difficult water level detection in drum washing machines without perforated inner drums by using wireless water level sensing technology. This technology not only provides accurate measurement but is also easy to implement and has wider applicability. The wireless water level detection device used is small in size, has good linearity, can accurately measure the water level inside the drum, and can transmit the data wirelessly. Furthermore, it has its own power supply or is wirelessly powered, resulting in low power consumption.

[0028] 2. The drum washing machine provided by the present invention sets the wireless water level detection device inside the lifting rib of the drum washing machine. While ensuring that the detection effect is not affected, it effectively solves the problem of difficult installation of the water level detection device in the drum washing machine. Furthermore, the wireless water level detection device is hidden inside the lifting rib, so it is not visible from the outside, which improves the overall aesthetics. Moreover, it does not occupy the internal space of the drum, improves the utilization rate of the internal space of the drum, and enhances the user experience.

[0029] 3. The drum washing machine provided by this invention has a drum wall that is partially recessed outward to form a receiving groove for installing the wireless water level detection device. The receiving groove for the wireless water level detection device is a pressed structure formed on the drum wall, which not only simplifies the molding process but also makes installation simple, convenient, and more stable. By placing the wireless water level detection device in the receiving groove using snap-fit ​​and / or screw and / or adhesive methods, the disassembly, replacement, and installation of the wireless water level detection device are convenient and quick. This application also provides a sealing structure between the wireless water level detection device and the receiving groove to ensure the sealing of the washing water inside the drum and prevent leakage.

[0030] 4. The control method for a drum washing machine provided by the present invention controls the rotation of the drum to rotate the wireless water level detection device to the bottom of the drum's circumferential side wall, and then starts the wireless water level detection device to start water level detection. During the water intake process, the wireless water level detection device is always at the bottom of the drum, making the measurement results of the wireless water level detection device more accurate, and solving the problems of complex and inaccurate water level detection procedures in existing drum washing machines. Attached Figure Description

[0031] Figure 1 A schematic diagram of the structure of a washing machine in the prior art;

[0032] Figure 2 A schematic diagram of the structure of the washing machine provided by the present invention;

[0033] Figure 3 This invention Figure 2 Enlarged view of point A in the middle;

[0034] The components include: 1. Roller; 101. Roller sidewall; 1011. Receiving groove; 10111. Air pressure communication hole; 102. Roller bottom; 2. Outer cylinder; 201. Outer cylinder sidewall; 202. Outer cylinder bottom; 3. Roller door; 4. Outer cylinder door; 5. Decorative door; 6. Sealing structure; 7. Wireless water level detection device; 8. Outer shell; 9. Lifting ribs;

[0035] 100. Air chamber; 200. Air delivery pipe; 300. Water level sensor Detailed Implementation

[0036] 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.

[0037] 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.

[0038] 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.

[0039] The present invention will be further described in detail below with reference to the embodiments.

[0040] like Figure 2 and Figure 3 As shown in the embodiment of the present invention, a clothing handling device is introduced, which includes a drum 1. This drum can hold clothes during drying and can independently hold washing water during washing, thus avoiding the problem of washing water being contaminated by dirt and bacteria accumulated outside the drum 1 during the washing process of a washing machine.

[0041] Specifically, this application provides a drum washing machine, including a casing 8, inside which is an outer drum 2. The outer drum 2 is connected to the washing machine casing 8 via shock-absorbing springs and shock-absorbing support rods at the top and bottom, respectively, so as to achieve the purpose of the outer drum 2 being vibratingly installed inside the washing machine casing 1. The outer drum 2 is fitted with a coaxially arranged drum 1; the outer drum 2 and the drum 1 are respectively composed of a cylindrical outer drum peripheral wall 201 and a drum peripheral wall 101. The corresponding ends on the same side of the outer drum 2 and the drum 1 are provided with opposite openings to form the drum opening and the outer drum opening, respectively. The corresponding ends on the other side are sealed to form the drum bottom 102 and the outer drum bottom 202, respectively. At the same time, a decorative door 5 that can be opened outward is installed at the front end of the washing machine casing 1. An outer drum door 4 that can be opened outward is provided at the position of the outer drum opening, so as to open or close the outer drum opening by opening and closing the outer drum door 4; and an outer drum door 1 that can be opened outward is installed on the drum 1, so as to open or close the drum opening by opening and closing the drum door 1. Thus, the effect of installing a drum 1 in the outer drum 2 that can rotate relative to the axis and form a closed water container during washing is achieved.

[0042] like Figure 2 As shown, this invention provides a drum washing machine, including: a drum 1, which can independently hold washing water; and a wireless water level detection device 7, which is installed inside the drum 1 to detect the water level of the washing water inside the drum 1. The wireless water level sensing technology solves the water level detection problem in drum washing machines without perforated inner drums, providing not only accurate measurement but also ease of implementation and wider applicability.

[0043] Furthermore, the wireless water level detection device 7 is disposed on the inner wall of the drum 1; preferably, a lifting rib 9 is provided inside the drum 1, and the lifting rib 9 has a certain cavity structure inside, with the wireless water level detection device 7 disposed within the cavity of the lifting rib 9. This invention places the wireless water level detection device within the lifting rib of the drum washing machine, effectively solving the installation difficulty of the water level detection device in the drum washing machine while ensuring that the detection effect is not affected. Furthermore, by hiding the wireless water level detection device within the lifting rib, it is not visible from the outside, improving the overall aesthetics, and does not occupy internal drum space, thus increasing the utilization rate of internal drum space and enhancing the user experience.

[0044] Furthermore, a portion of the peripheral wall 101 of the drum 1 is recessed outward to form a receiving groove 1011. The receiving groove 1011 is formed by stamping a portion of the peripheral wall 101 of the drum 1 outward. The wireless water level detection device 7 is fixedly installed within the receiving groove 1011. The internal space of the receiving groove 1011 is not less than the volume of the wireless water level detection device 7. Preferably, the shape and size of the receiving groove 1011 match the shape and size of the wireless water level detection device 7, effectively avoiding unnecessary waste of space resources and increasing the washing capacity of the drum. The drum wall of the drum 1 is partially recessed outward to form a receiving groove 1011 for installing the wireless water level detection device 7. The molding structure formed by stamping on the drum wall serves as the receiving groove 1011 for installing the wireless water level detection device. This not only simplifies the molding process but also makes installation simple and convenient, and provides higher stability. The problem of inconvenient installation of water level detection devices in existing drum washing machines can be solved through a simple molding structure.

[0045] Preferably, the wireless water level detection device 7 is placed in the receiving groove 1011 by means of snap-fit ​​and / or screw and / or adhesive. The wireless water level detection device 7 is placed in the receiving groove 1011 in a detachable manner. Specifically, the wireless water level detection device 7 is placed in the receiving groove 1011 by means of snap-fit ​​or screw connection. More preferably, the wireless water level detection device 7 and the receiving groove 1011 are assembled and connected by a snap-fit ​​method. Specifically, the wireless water level detection device 7 has a snap-fit ​​part, and the inner wall of the receiving groove 1011 has a mating part corresponding to the snap-fit ​​part, which cooperates with the snap-fit ​​part. The snap-fit ​​part can be a claw, and the mating part can be a groove. The snap-fit ​​cooperation between the wireless water level detection device 7 and the receiving groove is realized through the snap-fit ​​cooperation of the claw and the groove, so that the wireless water level detection device 7 and the receiving groove 1011 are stably engaged. Its disassembly and replacement are convenient and quick. By placing the wireless water level detection device 7 in the receiving groove 1011 through the snap-fit ​​installation connection method, there is no need to set up a separate auxiliary connecting component. The installation is realized by the structure of the wireless water level detection device 7 and the receiving groove 1011 themselves, which simplifies the structure, makes the assembly firm, and makes the disassembly, replacement and installation of the wireless water level detection device 7 convenient and quick.

[0046] Preferably, the peripheral wall 101 of the roller 1 has a lifting rib mounting area for mounting the lifting rib 9. The bottom surface of the lifting rib 9 covers and is mounted on the inner wall of a portion of the peripheral wall 101 of the roller 1. The peripheral wall 101 of the roller 1 covered by the bottom surface of the lifting rib 9 forms the lifting rib mounting area. The receiving groove 1011 is formed by the outward indentation of the portion of the peripheral wall 101 of the roller 1 where the lifting rib mounting area is located. By setting the receiving groove 1011 on the peripheral wall 101 of the roller 1 in the lifting rib mounting area, not only is the installation problem of the water level detection device effectively solved, but the wireless water level detection device is also hidden inside the lifting rib, making it invisible from the outside, thus improving the overall aesthetics. Furthermore, it does not occupy internal space of the roller, improving the utilization rate of internal space and enhancing the user experience.

[0047] Furthermore, the wireless water level detection device 7 includes a water level detection module, which has a detection end facing the washing water inside the drum 1 and a reference end connected to the external atmospheric pressure. The detection end senses the pressure change of the washing water inside the drum 1, and determines the water level height inside the drum 1 by the pressure change detected by the detection end. The receiving groove 1011 has a pressure communication hole 10111 connecting the reference end to the external atmospheric pressure of the drum 1. The pressure communication hole 10111 is opened on the peripheral side wall 101 of the drum 1, so that the reference end of the water level detection module is connected to the chamber between the drum 1 and the outer drum 2, and thus connected to the external atmospheric pressure. The water level detection module detects the water level inside the drum 1 by sensing the pressure difference between the washing water pressure inside the drum 1 and the external atmospheric pressure, and feeds back the detected water level information to the control unit of the washing machine through a wireless communication module. The wireless communication module uses wireless communication methods such as WLAN or Bluetooth for wireless communication.

[0048] In this application, the water level detection module uses a MEMS chip as a pressure sensor to detect the water level of the washing water in the drum. Current MEMS pressure sensors include MEMS silicon piezoresistive pressure sensors and MEMS silicon capacitive pressure sensors, both of which are microelectromechanical sensors fabricated on silicon wafers. MEMS silicon piezoresistive pressure sensors use high-precision semiconductor strain gauges to form a Wheatstone bridge as the force-to-electrical conversion measurement circuit, offering high measurement accuracy, low power consumption, and extremely low cost. The Wheatstone bridge piezoresistive sensor has zero output and consumes almost no power when there is no pressure change. The MEMS silicon piezoresistive pressure sensor uses a circular stress cup with a fixed inner wall of a silicon thin film. Using MEMS technology, four high-precision semiconductor strain gauges are directly etched at the point of maximum stress on its surface to form a Wheatstone bridge as the force-to-electrical conversion measurement circuit, directly converting the physical quantity of pressure into an electrical quantity. Its measurement accuracy can reach 0.01-0.03%FS. MEMS silicon capacitive pressure sensors utilize MEMS technology to fabricate a grid-like structure on a silicon wafer. The upper and lower grids form a capacitive pressure sensor group. When pressure is applied, the upper grid displaces downwards, changing the spacing between the upper and lower grids, thus altering the capacitance between the two grids; that is, Δpressure = Δcapacitance. The MEMS pressure sensor used in this application is not only small in size and has good linearity, but it can also accurately measure the water level inside the drum. Furthermore, it can wirelessly output the obtained signal via WLAN or Bluetooth, allowing for wireless connection between the water level detection module and the washing machine's control unit. This wireless signal transmission eliminates the need for wiring between the water level detection module and the washing machine's control unit, solving the problem of inconvenient wired signal transmission and making it more convenient to use.

[0049] Furthermore, the wireless water level detection device 7 has a hollow cavity housing, and the water level detection module is located inside the housing. The housing has a detection connection port and a reference connection port. The detection end of the water level detection module extends through the detection connection port into the drum 1 and contacts the washing water inside the drum 1 to sense changes in the water pressure of the washing water inside the drum. The detection connection port and the detection end of the water level detection module are sealed together to ensure the airtightness of the housing of the wireless water level detection device 7 and prevent the washing water inside the drum from entering the housing through the detection connection port, which would damage the internal structure of the wireless water level detection device 7 and affect its normal use.

[0050] The detection end faces the inside of the roller 1, and the reference end is located at the other end opposite to the detection end. The reference end is connected to the atmospheric pressure outside the roller 1. Specifically, the reference end is connected to the air pressure communication hole 10111 on the receiving groove 1011 through the reference communication port, and the reference communication port and the air pressure communication hole 10111 can be connected by a pipeline. Alternatively, as... Figure 3As shown, the reference connection port and the pressure connection hole 10111 are positioned correspondingly, directly achieving communication between the reference connection port and the pressure connection hole 10111. Preferably, this application adopts a direct communication method where the reference connection port and the pressure connection hole 10111 are positioned correspondingly, eliminating the need for a separate auxiliary connection component, simplifying the structure and reducing costs.

[0051] Furthermore, since there is a certain gap between the housing of the wireless water level detection device 7 and the inner wall of the receiving groove 1011, the washing water in the drum 1 can easily flow out of the drum 1 from the air pressure communication hole 10111 or enter the cavity of the housing from the reference communication port. In order to avoid the above phenomenon, this application provides a sealing structure 6 between the housing of the wireless water level detection device 7 and the inner wall of the receiving groove 1011 to ensure the sealing of the washing water in the drum, and to prevent the washing water in the drum from leaking out from the air pressure communication hole 10111 or entering the interior of the housing from the reference communication port, which would damage the internal structure of the wireless water level detection device and affect the normal use of the wireless water level detection device.

[0052] Preferably, such as Figure 2 and Figure 3 As shown, the receiving groove 1011 includes a bottom wall that is recessed outward from the peripheral side wall 101 of the drum 1 and a peripheral wall connecting the bottom wall and the peripheral side wall 101 of the drum 1. The bottom wall and the peripheral wall enclose a receiving groove 1011 with an open end and a certain internal accommodating space. The open end of the receiving groove 1011 faces the internal space of the drum 1. The air pressure communication hole 10111 is opened on the bottom wall of the receiving groove 1011. The sealing structure 6 is disposed between the bottom surface and / or the side surface of the housing and the inner wall of the receiving groove 1011. The sealing structure 6 is a sealing gasket disposed between the bottom surface and / or the side surface of the housing and the inner wall of the receiving groove 1011. The sealing gasket can be made of elastic rubber. The sealing structure provided in this application between the wireless water level detection device and the receiving groove effectively ensures the sealing of the washing water in the drum, preventing the washing water in the drum from leaking out or entering the inside of the housing.

[0053] Furthermore, the wireless water level detection device 7 also includes a wireless receiving module and a wireless transmitting module located inside the housing. The wireless receiving module receives the detection command from the control unit of the washing machine and controls the water level detection module to detect the water level of the washing water in the drum 1. The wireless transmitting module sends the water level information detected by the water level detection module to the control unit of the washing machine.

[0054] Furthermore, the wireless water level detection device 7 includes a wireless charging module, and the wireless water level detection device is either self-powered or uses a wireless power supply mode. The wireless water level detection device in this application uses wireless power supply, avoiding the inconvenience of connecting existing water level detection devices to power lines.

[0055] Another objective of this invention is to provide a control method for a drum washing machine. During the water intake phase of the washing / rinsing program, the wireless water level detection device detects the water level inside the drum and feeds the water level information back to the washing machine's control unit. The control unit controls the opening and closing of the washing machine's water intake system based on the water level information. Simultaneously with the start of water intake, the wireless water level detection device is activated. The device detects the water level in real time or at regular intervals and feeds the detected water level information back to the washing machine's control unit. The washing machine's server stores preset water levels. The control unit determines whether the current water level detected by the wireless water level detection device has reached the preset water level. If the control unit determines that the current water level has reached the preset water level, it controls the water intake system to close, stopping the water intake.

[0056] Furthermore, taking the central axis of the drum as a horizontal line: after each washing / rinsing cycle, the drum is rotated to move the wireless water level detection device to the bottom of the drum's circumferential wall, simultaneously locking the drum. Upon the next water intake, the wireless water level detection device is directly activated to detect the water level. A locking component is provided on the bottom wall of the outer drum. Upon completion of each washing or rinsing cycle, the washing machine's control unit controls the drum to rotate, moving the wireless water level detection device to the bottom of the drum's circumferential wall and controlling the locking component to lock the drum in position. Thus, upon the next water intake stage of the washing or rinsing cycle, the wireless water level detection device is directly activated.

[0057] Alternatively, in another approach, before each wash / rinse cycle begins the water intake phase, the wireless water level detection device is rotated to the bottom of the drum's sidewall and locked using a locking mechanism. Then, the water intake system is activated, and the wireless water level detection device begins its water level monitoring. Throughout the entire water intake process, the drum remains locked, ensuring the wireless water level detection device remains at the bottom of the drum to guarantee its accuracy.

[0058] The control method for a drum washing machine provided by the present invention controls the rotation of the drum to rotate the wireless water level detection device to the bottom of the drum's circumferential side wall, and then starts the wireless water level detection device to start water level detection. During the water intake process, the wireless water level detection device is always at the bottom of the drum, making the measurement results of the wireless water level detection device more accurate and solving the problem of complex and inaccurate water level detection procedures in existing drum washing machines.

[0059] The implementation schemes in the above embodiments can be further combined or replaced, and the embodiments are merely descriptions of preferred embodiments of the present invention, and are not intended to limit the concept and scope of the present invention. Various changes and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the design concept of the present invention shall fall within the protection scope of the present invention.

Claims

1. A drum washing machine, characterized in that: include: The drum can hold the washing water independently; An outer cylinder is coaxially mounted on the outside of the drum, and the outer cylinder and the drum are respectively composed of a cylindrical outer cylinder sidewall and a drum sidewall. A wireless water level detection device is used to detect the water level of the washing water inside the drum. The wireless water level detection device is installed on the inner wall of the drum. The drum is provided with lifting ribs, and the wireless water level detection device is installed inside the lifting ribs. The receiving groove is set on the circumferential sidewall of the roller in the lifting rib installation area, wherein the circumferential sidewall of the roller is partially recessed outward to form a receiving groove, and the wireless water level detection device is fixedly installed in the receiving groove. The wireless water level detection device includes a water level detection module. The water level detection module has a detection end facing the washing water inside the drum and a reference end communicating with the external atmospheric pressure. The receiving groove has an air pressure communication hole that connects the reference end with the external atmospheric pressure of the drum. The air pressure communication hole is opened on the peripheral side wall of the drum. The reference end of the water level detection module communicates with the chamber between the drum and the outer cylinder, and thus communicates with the external atmospheric pressure. A locking component is provided on the bottom wall of the outer cylinder, which rotates the wireless water level detection device to the bottom of the circumferential side wall of the drum and locks the drum.

2. A drum washing machine according to claim 1, characterized in that: The wireless water level detection device is placed in the receiving groove by means of snap-fit ​​and / or screw and / or adhesive.

3. A drum washing machine according to claim 2, characterized in that: The peripheral wall of the roller has a lifting rib mounting area for mounting the lifting rib, and the receiving groove is formed by the outward indentation of the peripheral wall portion of the roller where the lifting rib mounting area is located.

4. A drum washing machine according to claim 1, characterized in that: The wireless water level detection device has a hollow cavity housing, and the water level detection module is located inside the housing. The housing has a detection communication port and a reference communication port. The detection end of the water level detection module extends into the drum through the detection communication port, and the reference end is connected to the air pressure communication hole on the receiving groove through the reference communication port.

5. A drum washing machine according to claim 4, characterized in that: A sealing structure is provided between the housing and the inner wall of the receiving groove.

6. A drum washing machine according to claim 5, characterized in that: The sealing structure is a sealing gasket disposed between the bottom surface and / or the side surface of the housing and the inner wall of the receiving groove.

7. A drum washing machine according to claim 4, characterized in that: The wireless water level detection device also includes a wireless receiving module and a wireless transmitting module located inside the housing. The wireless receiving module receives the detection command from the control unit of the washing machine and controls the water level detection module to detect the water level of the washing water in the drum. The wireless transmitting module sends the water level information detected by the water level detection module to the control unit of the washing machine.

8. A drum washing machine according to claim 1, characterized in that: The outer drum and the drum are provided with opposite openings on the same side to form the drum opening and the outer drum opening respectively. The opposite ends on the other side are sealed to form the drum bottom and the outer drum bottom respectively. During washing, the inside of the drum can independently hold the washing water.

9. A control method for a drum washing machine according to any one of claims 1-8, characterized in that: During the water intake phase of the washing / rinsing program, the wireless water level detection device detects the water level inside the drum and feeds the water level information back to the washing machine's control unit. The control unit then controls the opening and closing of the washing machine's water intake system based on the water level information.

10. The control method for a drum washing machine according to claim 9, characterized in that: With the central axis of the roller as the horizontal line: After each washing / rinsing cycle, the control drum rotates to move the wireless water level detection device to the bottom of the drum's circumferential sidewall, and the drum is locked. When water is added next time, the wireless water level detection device is directly activated to detect the water level. Alternatively, before the washing machine enters the water intake stage, the wireless water level detection device can be rotated to the bottom of the drum's circumferential side wall, the drum can be locked, and then the water intake system can be controlled to take in water while simultaneously activating the wireless water level detection device to begin water level detection.

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