A drum washing machine

Abstract

The present application belongs to the technical field of washing machines, and discloses a drum washing machine, which comprises an inner drum for independently containing water when washing clothes and a water level detection module, wherein the water level detection module comprises a water level detection element installed on the inner drum, and the water level detection element has a water pressure detection part arranged on the inner side of the inner drum and used for obtaining the water pressure in the drum and an air pressure detection part arranged on the outer side of the inner drum and used for obtaining the current ambient air pressure.In the present application, the water level detection element can judge the water level condition through the water pressure in the drum and can also obtain the current ambient air pressure, so that the influence of the change of the ambient air pressure on the water level detection result is eliminated, and the accuracy of the water level detection result is improved.

Description

Technical Field

[0001] This invention belongs to the field of washing machine technology, specifically, it relates to a drum washing machine. Background Technology

[0002] Existing front-loading washing machines generally consist of an inner drum and an outer drum, with multiple drain holes on the inner drum wall. However, during the washing process, the washing water between the inner and outer drums is not utilized, resulting in waste. Simultaneously, some dirt generated during the washing process remains between the inner and outer drums, making it difficult to clean. Over time, this accumulation can contaminate the washing water and affect the washing effect.

[0003] To address the aforementioned issues, a washing machine without a dewatering hole on the inner drum is proposed. This allows the inner drum to independently hold the washing water during the washing process, thus preventing water accumulation between the inner and outer drums, saving on washing water consumption, and also significantly reducing the accumulation of dirt between the inner and outer drums.

[0004] However, since there is no water between the inner and outer drums during the washing process, the water level cannot be detected using the traditional method of installing a water level detection device inside the outer drum. If the water level detection device is directly installed on the inner drum, it will rotate along with the inner drum during the washing process. If the same method as traditional washing machines is used, connecting the water level detection device directly to the fixed control system via a signal line to transmit the water level signal, the wiring method is quite complex, requiring a large number of control cables between the inner and outer drums, and it may also affect the rotation of the inner drum.

[0005] To achieve signal transmission between the moving water level detection device and the fixed control system, existing technologies utilize wireless communication in the aforementioned washing machine. The water level signal detected by the detection device is transmitted wirelessly to the control system, thereby controlling the washing machine's operation. Most existing water level detection devices work by detecting water pressure and then converting it into a corresponding water level value. However, actual water pressure is often affected by ambient air pressure. At the same water level, different ambient air pressures will result in different detected water pressure values, leading to errors between the detected water level and the actual water level, which is detrimental to accurate water level control.

[0006] In view of this, the present invention is hereby proposed. Summary of the Invention

[0007] 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 can eliminate the influence of ambient air pressure on water level detection results.

[0008] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by the present invention is as follows:

[0009] A drum washing machine includes an inner drum that independently holds water during washing clothes, and a water level detection module. The water level detection module includes a water level detection element mounted on the inner drum, the water level detection element having:

[0010] The water pressure detection unit is located inside the inner cylinder and is used to obtain the water pressure inside the cylinder;

[0011] The air pressure detection unit is located on the outside of the inner cylinder and is used to obtain the current ambient air pressure.

[0012] Furthermore, a protective shell is installed on the outer side of the inner cylinder, and the portion of the water level detection element located on the outer side of the inner cylinder is disposed inside the protective shell; a first through hole is provided on the protective shell to connect the inner and outer sides of the protective shell, and the air pressure detection part is connected to the external environment through the first through hole.

[0013] Furthermore, the protective housing includes:

[0014] The protective box has an opening facing the outer wall of the inner cylinder, and the first through hole is provided on the surface of the protective box opposite to the opening;

[0015] A protective cover is fastened to the opening of the protective box, and a second through hole is provided on the protective cover for the water pressure detection part to pass through.

[0016] Furthermore, the outer periphery of the first through hole extends a certain length from the inner wall of the protective box into the interior of the protective box to form a sleeve portion, and the air pressure detection part is an air pressure probe inserted into the sleeve portion.

[0017] Furthermore, the inner wall of the sleeve portion protrudes into the sleeve portion near the extended end of the sleeve portion to form an annular boss, and a gasket is fitted on the air pressure probe, the gasket abutting against the surface of the annular boss facing the inside of the protective box.

[0018] Furthermore, an installation port is provided on the inner cylinder, and the water pressure detection part is a water pressure probe that passes through the installation port and extends into the inner cylinder; a protective cover covering the water pressure probe is installed on the inner side of the inner cylinder, and a detection hole is provided on the protective cover to allow the water pressure probe to communicate with the inside of the inner cylinder.

[0019] Furthermore, the outer periphery of the detection hole protrudes towards the inner wall of the inner cylinder to form a cylindrical part, and the water pressure probe is partially inserted into the cylindrical part, and the detection end of the water pressure probe does not protrude from the surface of the protective cover facing away from the inner wall of the inner cylinder.

[0020] Furthermore, a protective shell is installed on the outer side of the inner cylinder, and the portion of the water level detection element located on the outer side of the inner cylinder is disposed inside the protective shell;

[0021] The protective housing has an installation hole, the inner cylinder has a third through hole corresponding to the installation hole, and the protective cover has a connecting part corresponding to the installation hole; the connecting piece passes through the installation hole and the third through hole sequentially from the outside of the protective housing and connects with the connecting part.

[0022] Furthermore, a sealing element is provided between the protective cover and the inner wall of the inner cylinder. The sealing element has a sealing surface facing the inner wall of the inner cylinder, and the outer peripheral area of ​​the sealing surface is in sealing contact with the inner wall of the inner cylinder. The mounting port and the third through hole are located inside the area enclosed by the outer periphery of the sealing surface.

[0023] A sealing hole is provided on the sealing element corresponding to the installation port. The water pressure probe is inserted into the sealing hole, and the inner wall of the sealing hole is sealed and fitted with the outer peripheral side wall of the water pressure probe.

[0024] Furthermore, the drum washing machine also includes an outer drum, and the inner drum is disposed inside the outer drum; the water level detection module also includes a wireless power supply device, the wireless power supply device comprising:

[0025] The encapsulation housing is installed on the outer cylinder, and the installation position corresponds to the position of the water level detection element when the inner cylinder rotates to its lowest point.

[0026] A wireless power supply element, disposed inside the encapsulation housing, is used to supply power to the water level detection element.

[0027] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art.

[0028] In this invention, the water level detection element can simultaneously acquire the water pressure inside the inner drum and the current ambient air pressure outside to determine the water level inside the drum. This eliminates the influence of changes in ambient air pressure on the water level detection results, thereby improving the accuracy of the water level detection results of the drum washing machine and helping to ensure the washing effect.

[0029] In this invention, a protective shell is installed on the outside of the inner drum, so that the air pressure detection part is located inside the protective shell. This can protect the air pressure detection part and prevent it from colliding with the surrounding structure and being damaged due to the vibration of the inner drum during the operation of the drum washing machine.

[0030] In this invention, the water pressure probe located inside the inner cylinder is encased within a protective cover, preventing damage from the impact of clothing tumbling inside the cylinder. The sealing element simultaneously covers the mounting opening and the third through hole on the inner wall of the inner cylinder, achieving a seal through its outer periphery fitting against the inner wall. This eliminates the need for separate sealing structures for each opening on the inner cylinder, simplifying the sealing structure and reducing assembly steps.

[0031] In this invention, a wireless power supply is used to power the water level detection element. The wireless power supply element is set inside the encapsulation shell, and the encapsulation shell is installed on the outer cylinder, which protects the wireless power supply element and ensures that the wireless power supply element does not come into contact with the washing water, making it safer and more reliable.

[0032] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0033] 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:

[0034] Figure 1 This is a partial structural schematic diagram of a drum washing machine in an embodiment of the present invention;

[0035] Figure 2 This is a partial structural schematic diagram of the drum washing machine from another perspective in an embodiment of the present invention;

[0036] Figure 3 This is a schematic diagram of the water level detection device in an embodiment of the present invention;

[0037] Figure 4 This is the present invention. Figure 3 Schematic diagram of section AA;

[0038] Figure 5 This is an exploded view of the water level detection device in an embodiment of the present invention;

[0039] Figure 6 This is a schematic diagram of the water level detection device installed on the front flange of the inner cylinder in an embodiment of the present invention;

[0040] Figure 7 This is a schematic diagram of the structure of the inner cylinder front flange in an embodiment of the present invention;

[0041] Figure 8 This is an exploded view of the wireless power supply device in an embodiment of the present invention.

[0042] In the diagram: 100, outer cylinder; 101, outer cylinder front flange; 200, inner cylinder; 201, inner cylinder front flange; 202, mounting port; 203, third through hole; 300, water level detection device; 310, water level detection element; 311, water pressure probe; 312, air pressure probe; 320, protective box; 321, first through hole; 322, sleeve part; 323, annular boss; 324, gasket; 325, mounting hole; 330, protective cover; 331, second through hole; 332, groove; 333, claw; 340, protective cover; 341, detection hole; 342, cylindrical part; 343, screw post; 350, sealing gasket; 351, sealing hole; 352, sealing part; 353, fourth through hole; 400, wireless power supply device; 410, wireless power supply element; 420, encapsulation box; 430, encapsulation cover.

[0043] 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

[0044] 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.

[0045] 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.

[0046] 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.

[0047] like Figures 1 to 8 As shown, an embodiment of the present invention provides a drum washing machine, including an outer drum 100 and an inner drum 200. The inner drum 200 is disposed inside the outer drum 100 and can independently hold water when washing clothes.

[0048] Specifically, the inner drum 200 does not have dewatering holes on its wall, and an inner drum door (not shown in the figure) is installed at the drum opening. During washing, the inner drum door is closed, keeping the inner drum 200 sealed and able to independently hold the washing water. During the washing / rinsing process, no water remains between the inner drum 200 and the outer drum 100, thus saving water consumption and preventing the accumulation of dirt between them.

[0049] In this embodiment, the inner drum 200 can drain water by providing a drain hole on the drum wall and installing a sealing component at the drain hole. During washing / rinsing, the sealing component blocks the drain hole, allowing the inner drum 200 to hold water independently. During drainage, the inner drum 200 is controlled to reach a certain rotation speed, and the sealing component can open the drain hole under centrifugal force to drain the washing water. The outer drum 100 is connected to the drainage structure of the washing machine; water discharged from the inner drum 200 enters the outer drum 100 and is then discharged from the washing machine through the drainage structure.

[0050] The drum washing machine in this embodiment also includes a water level detection module, which specifically includes a water level detection device 300 installed on the inner drum 200 and a wireless power supply device 400 installed on the outer drum 100. The wireless power supply device 400 can wirelessly supply power to the water level detection device 300, enabling the water level detection device 300 to operate and obtain the water level height in the inner drum 200.

[0051] Specifically, the water level detection device 300 in this embodiment includes a water level detection element 310, which receives power from the wireless power supply device 400 to detect the water level. The water level detection element 310 has a water pressure detection section and an air pressure detection section. The water pressure detection section is located inside the inner cylinder 200 to obtain the water pressure inside the cylinder; the air pressure detection section is located outside the inner cylinder 200 to obtain the current ambient air pressure.

[0052] In this embodiment, the water level detection element 310 can simultaneously acquire the water pressure inside the inner cylinder 200 and the current ambient air pressure, and comprehensively determine the water level inside the cylinder based on the water pressure inside the cylinder and the current ambient air pressure. In this way, the influence of changes in ambient air pressure on the actual value of the detected water pressure can be eliminated, and the problem of different ambient air pressures affecting the water level detection results can be avoided.

[0053] In one embodiment of this invention, a gauge pressure level sensor is used as the water level detection element 310. The water pressure detection part is a water pressure probe 311, and the air pressure detection part is an air pressure probe 312. The actual water level in the inner drum 200 is determined based on the relative value of the pressure detected by the water pressure probe 311 and the air pressure probe 312, rather than based on the absolute value of the water pressure detected by the water pressure probe 311. This improves the accuracy of water level detection in the drum washing machine, and more precise water level control helps ensure the washing effect of the drum washing machine.

[0054] In this specific embodiment, the water level detection device 300 is installed on the front flange 201 of the inner cylinder and is close to the outer periphery of the inner cylinder 200. When the water level detection device 300 rotates with the inner cylinder 200 to the lowest position, the water pressure probe 311 of the water level detection element 310 is basically located at the lowest point in the inner cylinder 200, and the obtained water level detection structure is more accurate.

[0055] Installing the water level detection device 300 on the front flange 201 of the inner drum reduces the impact on the water pressure probe 311 of the water level detection element 310 when clothes tumble and fall inside the inner drum 200, compared to installing the detection device on the drum wall. This prevents the water pressure probe 311, located inside the inner drum 200, from being damaged by the clothes. It also reduces the probability of the water pressure probe 311 being covered by clothes inside the drum, thus preventing the clothes from affecting the accuracy of the water pressure detection results.

[0056] Accordingly, in order to enable the wireless power supply device 400 to wirelessly supply power to the water level detection element 310, the wireless power supply device 400 is installed on the front flange 101 of the outer cylinder, and its installation position corresponds to the position of the water level detection device 300 when it rotates to the lowest position with the inner cylinder 200.

[0057] Specifically, the water level detection element 310 includes a coil that is mutually inductive with the wireless power supply device 400, which can generate a changing magnetic field. When the water level detection element 310 rotates with the inner cylinder 200 and approaches its lowest point, it enters the coverage area of ​​the magnetic field. The magnetic field induces a current in the coil, thereby providing electrical energy to the water level detection element 310, enabling it to operate and acquire water level information in the inner cylinder 200.

[0058] In another embodiment, the water level detection device can be installed on the inner cylinder rear flange, and the wireless power supply device can be installed on the outer cylinder rear flange, which can achieve a similar effect.

[0059] In a further embodiment, the water level detection device 300 also includes a protective housing installed on the outside of the inner cylinder 200, with the portion of the water level detection element 310 located on the outside of the inner cylinder 200 disposed inside the protective housing. Specifically, the protective housing is installed on the outer surface of the front flange 201 of the inner cylinder, and the portion of the water level detection element 310 located on the outside of the inner cylinder 200 includes electronic components such as a pressure probe 312 and a coil receiving power from the wireless power supply device 400. By placing these electronic components inside the protective housing, their direct exposure to the outside of the inner cylinder 200 is avoided, thus providing a certain degree of protection.

[0060] For example, during the operation of a drum washing machine, the inner drum 200 may experience significant vibrations. The protective shell prevents electronic components such as the pressure probe 312 from colliding with the outer drum 100 or other structures during the vibration of the inner drum 200, thus avoiding damage to these components. Furthermore, the protective shell prevents coils and other components from being directly immersed in the drain water, thus avoiding short-circuit damage.

[0061] In this embodiment, the protective housing specifically includes a protective box 320 and a protective cover 330. The protective box 320 has an opening facing the outer wall of the inner cylinder 200, that is, the front surface of the front flange 201 of the inner cylinder. The protective cover 330 is fastened to the opening of the protective box 320, thereby forming a relatively closed space between the protective box 320 and the protective cover 330.

[0062] Specifically, the outer periphery of the protective cover 330 is provided with several claws 333, which engage with the open edge of the protective box 320 to achieve relative fixation between the protective box 320 and the protective cover 330.

[0063] To enable the water pressure probe 311 and air pressure probe 312 of the water level detection element 310 to obtain the water pressure inside the cylinder and the current ambient air pressure respectively, a first through hole 321 connecting the inside and outside of the protective box 320 is provided on the surface of the protective box 320 facing away from the open end. The air pressure probe 312 communicates with the external environment through the first through hole 321, thereby detecting the current ambient air pressure. A second through hole 331 is provided on the protective cover 330, through which the water pressure probe 311 passes. An installation port 202 is provided on the front flange 201 of the inner cylinder, through which the water pressure probe 311 extends into the inner cylinder 200.

[0064] In this embodiment, the inner surface of the protective cover 330 is provided with multiple mutually perpendicular reinforcing ribs, and a rectangular groove 332 is provided on the outer periphery of the second through hole 331. When the water pressure probe 311 passes through the second through hole 331, the groove 332 is used to avoid the main body of the water level detection element 310.

[0065] Furthermore, the outer periphery of the first through hole 321 extends a certain length from the inner wall of the protective box 320 into the interior of the protective box 320 to form a sleeve portion 322. The air pressure probe 312 is inserted into the sleeve portion 322, and the detection end of the air pressure probe 312 (i.e., Figure 4 The lower end of the medium pressure probe 312 does not protrude from the outer surface of the protective box 320.

[0066] In the above scheme, the pressure probe 312 is inserted into the sleeve portion 322 and can communicate with the outside of the protective box 320 through the first through hole 321, thereby achieving the purpose of obtaining the current ambient air pressure. The detection end of the pressure probe 312 is flush with or slightly recessed into the outer surface of the protective box 320, which can effectively protect the detection end of the pressure probe 312 and prevent the pressure probe 312 from colliding with the outer cylinder 100 structure. The sleeve portion 322, in conjunction with the pressure probe 312, also facilitates the positioning of the water level detection element 310 during assembly with the protective box 320.

[0067] In a further embodiment, the inner wall of the sleeve portion 322 protrudes into the sleeve portion 322 near the extended end of the sleeve portion 322 to form an annular boss 323, and a washer 324 is fitted onto the air pressure probe 312. The air pressure probe 312 is inserted into the sleeve portion 322, and the washer 324 abuts against the surface of the annular boss 323 facing the interior of the protective box 320.

[0068] Specifically, the washer 324 is clamped between the annular boss 323 and the main body of the water level detection element 310.

[0069] Preferably, the outer diameter of the washer 324 is exactly equal to or slightly smaller than the inner diameter of the sleeve portion 322.

[0070] In the above solution, by fitting a washer 324 onto the pressure probe 312, the pressure probe 312 can be fixed without direct contact between it and the sleeve portion 322, preventing damage from collisions. Furthermore, since there is a gap between the outer peripheral wall of the pressure probe 312 and the inner wall of the sleeve portion 322, the washer 324 can also seal this gap, preventing water from the outer cylinder 100 from entering the protective box 320 through the first through hole 321 during drainage, thus preventing water damage to the internal electronic components.

[0071] In this embodiment, the water level detection device 300 also includes a protective structure for the water pressure probe 311. Specifically, a protective cover 340 covering the water pressure probe 311 is installed on the inner side of the inner cylinder 200, and a detection hole 341 is opened on the protective cover 340 to allow the water pressure probe 311 to communicate with the inside of the inner cylinder 200.

[0072] The protective cover 340 prevents the clothes inside the tub from hitting the water pressure probe 311 during the tumbling and tumbling process, thus protecting the water pressure probe 311 from easy damage.

[0073] Furthermore, the outer periphery of the detection hole 341 protrudes towards the inner wall of the inner cylinder 200, that is, the inner surface of the front flange 201 of the inner cylinder, to form a cylindrical portion 342. The water pressure probe 311 is partially inserted into the cylindrical portion 342, and the detection end of the water pressure probe 311 (i.e., Figure 4 The upper end of the medium water pressure probe 311 does not protrude from the surface of the protective cover 340 facing away from the inner cylinder front flange 201.

[0074] In the above scheme, the cylindrical part 342 on the protective cover 340 completely surrounds the detection end of the water pressure probe 311. Water in the inner cylinder 200 can contact the water pressure probe 311 through the detection hole 341 and the cylindrical part 342, enabling the water pressure probe 311 to detect the water pressure inside the cylinder. However, the clothes inside the cylinder can only cover the surface of the protective cover 340 and will not impact or scratch the water pressure probe 311.

[0075] In this embodiment, the outer protective box 320 and the inner protective cover 340 are connected as one unit by a connector passing through the inner cylinder front flange 201, thereby realizing the installation of the water level detection device 300.

[0076] Specifically, a mounting hole 325 is provided on the protective box 320, a third through hole 203 is provided on the inner cylinder front flange 201 corresponding to the mounting hole 325, and a connecting part is provided on the protective cover 340 corresponding to the mounting hole 325. A connector passes through the mounting hole 325 and the third through hole 203 from the outside of the protective box 320 and connects with the connecting part to complete the installation of the water level detection device 300.

[0077] In detail, the protective box 320 has mounting holes 325 with stepped inner walls near both ends. The connecting parts are screws, and the connecting parts on the protective cover 340 are screw posts 343. The screw posts 343 are inserted into the third through hole 203 on the inner cylinder front flange 201. The screws are inserted into the mounting holes 325 on the protective box 320, with one end of the screw abutting against the stepped inner wall of the mounting hole 325 for fixation, and the other end screwed into the screw post 343.

[0078] With the above structure, it is not necessary to fix the protective box 320 and the protective cover 340 to the inner cylinder front flange 201 respectively, which simplifies the installation operation of the water level detection device 300.

[0079] In a further embodiment, a sealing element is provided between the protective cover 340 and the inner cylinder front flange 201 to prevent water leakage at the mounting port 202 and the third through hole 203 on the inner cylinder front flange 201.

[0080] Specifically, the sealing element is a gasket 350, which has a sealing surface facing the inner cylinder front flange 201. The outer periphery of the sealing surface protrudes towards the inner cylinder front flange 201 to form a sealing portion 352. The sealing portion 352 is sealed and fitted to the inner surface of the inner cylinder front flange 201, preventing water from the inner cylinder 200 from seeping between the gasket 350 and the inner cylinder front flange 201. The mounting port 202 and the third through hole 203 are both located inside the area enclosed by the sealing portion 352 on the inner cylinder front flange 201, thereby preventing water in the inner cylinder 200 from leaking out through the mounting port 202 and the third through hole 203.

[0081] Since the water pressure probe 311 needs to come into contact with the water in the inner cylinder 200, a sealing hole 351 is made on the sealing gasket 350 at the position corresponding to the mounting port 202 on the front flange 201 of the inner cylinder. The water pressure probe 311 passes through the sealing hole 351, and the inner wall of the sealing hole 351 is sealed and fitted with the outer peripheral side wall of the water pressure probe 311, so that no water will leak between the sealing hole 351 and the water pressure probe 311, and thus no water will seep into the space between the sealing gasket 350 and the front flange 201 of the inner cylinder through the sealing hole 351.

[0082] Furthermore, the gasket 350 is also provided with a fourth through hole 353 through which the screw post 343 passes. To prevent water in the inner cylinder 200 from entering between the gasket 350 and the front flange 201 of the inner cylinder through the fourth through hole 353, thereby causing water leakage at the mounting port 202 or the third through hole 203, the area surrounding the fourth through hole 353 between the protective cover 340 and the gasket 350 must be sealed.

[0083] In the specific embodiment, the surface of the sealing gasket 350 facing the protective cover 340 is sealed and fitted with the protective cover 340 along its outer periphery. At the same time, the end face of the cylindrical portion 342 on the protective cover 340 is sealed and fitted with the sealing gasket 350.

[0084] The above structure effectively ensures the sealing effect after the water level detection device 300 is installed on the inner cylinder front flange 201, thus preventing water leakage from the inner cylinder 200.

[0085] In a further embodiment, the wireless power supply device 400 installed on the outer cylinder 100 includes a housing and a wireless power supply element 410 disposed inside the housing. The wireless power supply element 410 is used to generate a variable magnetic field to supply power to the water level detection element 310.

[0086] The encapsulation housing specifically includes an encapsulation box 420 and an encapsulation cover 430, which are fastened together to encapsulate the wireless power supply element 410 inside, thereby protecting the wireless power supply element 410. Even if the drum washing machine leaks, the wireless power supply element 410 will not come into contact with the washing water because it is encapsulated, making it safer and more reliable.

[0087] In a further embodiment, the water level detection module further includes a signal feedback device. The signal feedback device specifically includes a signal transmitting element disposed on the inner cylinder 200 and electrically connected to the water level detection element 310, and a signal receiving element communicatively connected to the signal transmitting element.

[0088] In the above scheme, the signal transmitting element is electrically connected to the water level detection element 310, which can acquire the detection result of the water level in the inner drum 200 by the water level detection element 310, and then transmit it to the signal receiving element via wireless communication. Alternatively, the signal transmitting element and the water level detection element 310 can be wired together to acquire the water level detection result, requiring both to be installed on the inner drum 200. The signal receiving element is electrically connected to the control system of the drum washing machine, transmitting the received water level detection result to the control system for controlling the operation of the drum washing machine. The water level detection module achieves information transmission through the wireless communication connection between the signal transmitting element and the signal receiving element, saving on cable routing and avoiding the problem of complex internal wiring structures in the drum washing machine.

[0089] In a preferred embodiment, the signal transmitting element is located outside the inner cylinder 200 and integrated with the water level detection element 310. The signal transmitting element is also housed inside the protective housing formed by the protective box 320 and the protective cover 330. Similarly, the signal receiving element is integrated with the wireless power supply element 410 and together encapsulated inside the encapsulation housing formed by the encapsulation box 420 and the encapsulation cover 430.

[0090] In the above scheme, the signal transmitting element and the water level detection element 310, as well as the signal receiving element and the wireless power supply element 410, are integrated, simplifying the overall structure of the water level detection module and thus simplifying the assembly process of the drum washing machine. The signal transmitting element and the water level detection element 310 are integrated, and the wireless power supply element 410 simultaneously supplies power to both the water level detection element 310 and the signal transmitting element. When the signal transmitting element and the water level detection element 310 rotate with the inner drum 200 into the coverage area of ​​the magnetic field generated by the wireless power supply element 410, that is, near the lowest point, the wireless power supply element 410 can supply power to the signal transmitting element and the water level detection element 310. The water level detection element 310 detects the water level in the inner drum 200 and transmits the detection result to the signal receiving element through the signal transmitting element, so that the control system can obtain the water level in the inner drum 200.

[0091] In this embodiment, the water level detection element 310 can simultaneously acquire the water pressure in the inner drum 200 and the current ambient air pressure outside the inner drum 200. By comparing the acquired water pressure value and air pressure value, the water level height in the inner drum 200 can be determined, which can eliminate the influence of ambient air pressure changes on the water level detection result and improve the accuracy of the drum washing machine in detecting the water level height in the inner drum 200.

[0092] A protective cover 340 is installed inside the inner cylinder 200 to protect the water pressure probe 311. A protective housing consisting of a protective box 320 and a protective cover 330 is installed outside the inner cylinder 200 to protect the air pressure probe 312, ensuring that the water pressure probe 311 and the air pressure probe 312 are not easily damaged, thereby ensuring the accuracy of the water level detection results. The portion of the water level detection element 310 located outside the inner cylinder 200 is entirely inside the protective housing, which also ensures that the electronic components are not immersed in water when the inner cylinder 200 drains water into the outer cylinder 100, preventing damage to the electronic components from water immersion.

[0093] 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. 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 an inner drum that independently holds water during washing clothes, and a water level detection module, characterized in that, The water level detection module includes a water level detection device installed on the front flange of the inner cylinder and near the outer periphery of the inner cylinder. The water level detection device includes a water level detection element, which has the following characteristics: The water pressure detection unit is located inside the inner cylinder and is used to obtain the water pressure inside the cylinder; A pressure probe is installed on the outside of the inner cylinder to obtain the current ambient air pressure; A protective shell is installed on the outside of the inner cylinder, and the portion of the water level detection element located on the outside of the inner cylinder is disposed inside the protective shell; a first through hole is provided on the protective shell to connect the inner and outer sides of the protective shell, and the air pressure probe is connected to the external environment through the first through hole; The outer periphery of the first through hole extends a certain length into the protective housing to form a sleeve portion. The inner wall of the sleeve portion protrudes into the sleeve portion near the extended end to form an annular boss. The air pressure probe is inserted into the sleeve portion. A gasket is fitted on the air pressure probe, and the gasket is clamped between the annular boss and the main body of the water level detection element.

2. The drum washing machine according to claim 1, characterized in that, The protective housing includes: The protective box has an opening facing the outer wall of the inner cylinder, and the first through hole is provided on the surface of the protective box opposite to the opening; A protective cover is fastened to the opening of the protective box, and a second through hole is provided on the protective cover for the water pressure detection part to pass through; The inner surface of the protective cover is provided with multiple mutually perpendicular reinforcing ribs, and a rectangular groove is provided on the outer periphery of the second through hole to avoid the main body of the water level detection element.

3. The drum washing machine according to claim 2, characterized in that, The outer periphery of the first through hole extends a certain length from the inner wall of the protective box into the interior of the protective box to form the sleeve portion, and the detection end of the air pressure probe does not protrude from the outer surface of the protective box.

4. The drum washing machine according to claim 3, characterized in that, There is a gap between the outer peripheral sidewall of the air pressure probe and the inner wall of the sleeve; the washer abuts against the surface of the annular boss facing the inside of the protective box, and the outer peripheral diameter of the washer is exactly equal to or slightly smaller than the inner diameter of the sleeve.

5. The drum washing machine according to any one of claims 1-4, characterized in that, An installation port is provided on the inner cylinder, and the water pressure detection part is a water pressure probe that passes through the installation port and extends into the inner cylinder; a protective cover covering the water pressure probe is installed on the inner side of the inner cylinder, and a detection hole is provided on the protective cover to allow the water pressure probe to communicate with the inside of the inner cylinder.

6. The drum washing machine according to claim 5, characterized in that, The outer periphery of the detection hole protrudes towards the inner wall of the inner cylinder to form a cylindrical part. The water pressure probe is partially inserted into the cylindrical part, and the detection end of the water pressure probe does not protrude from the surface of the protective cover facing away from the inner wall of the inner cylinder, so that the cylindrical part completely surrounds the detection end of the water pressure probe.

7. The drum washing machine according to claim 6, characterized in that, The protective housing has an installation hole, the inner cylinder front flange has a third through hole corresponding to the installation hole, and the protective cover has a connecting part corresponding to the installation hole; the connecting piece passes through the installation hole and the third through hole sequentially from the outside of the protective housing and connects with the connecting part. The inner wall of the mounting hole has a stepped structure, the connector is a screw, and the connecting part is a screw post; the screw post passes through the third through hole, the screw passes through the mounting hole, one end of which is fixed against the inner wall of the stepped structure of the mounting hole, and the other end is screwed into the screw post.

8. The drum washing machine according to claim 7, characterized in that, A sealing gasket is provided between the protective cover and the inner wall of the inner cylinder. The sealing gasket has a sealing surface facing the inner wall of the inner cylinder. The outer periphery of the sealing surface protrudes towards the front flange of the inner cylinder to form a sealing part. The sealing part is sealed and fitted to the inner surface of the front flange of the inner cylinder. The mounting port and the third through hole are located inside the area enclosed by the sealing part on the front flange of the inner cylinder. A sealing hole is provided on the sealing gasket corresponding to the installation port. The water pressure probe passes through the sealing hole, and the inner wall of the sealing hole is sealed and fitted with the outer peripheral side wall of the water pressure probe. A fourth through hole is provided on the sealing gasket for the screw post to pass through. The end face of the cylindrical part is sealed and fitted with the sealing gasket.

9. The drum washing machine according to any one of claims 1-4, characterized in that, The drum washing machine further includes an outer drum, and the inner drum is disposed inside the outer drum; the water level detection module further includes a wireless power supply device, which includes: The encapsulation housing is installed on the outer cylinder, and the installation position corresponds to the position of the water level detection element when the inner cylinder rotates to its lowest point. A wireless power supply element, disposed inside the encapsulation housing, is used to supply power to the water level detection element; The water level detection module includes a signal feedback device, which specifically includes a signal transmitting element disposed on the inner cylinder and electrically connected to the water level detection element; the signal transmitting element is disposed inside the protective housing, and the wireless power supply element supplies power to both the water level detection element and the signal transmitting element.

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