WO2023169156A1

WO2023169156A1 - Drum washing machine

Info

Publication number: WO2023169156A1
Application number: PCT/CN2023/075825
Authority: WO
Inventors: 刘凯; 于明亮; 刘晓春; 侯永顺
Original assignee: 青岛海尔洗衣机有限公司; 海尔智家股份有限公司
Priority date: 2022-03-10
Filing date: 2023-02-14
Publication date: 2023-09-14
Also published as: CN116770555A

Abstract

A drum washing machine, comprising: an inner cylinder (200), which independently holds water during laundry washing, and a water level detection apparatus (300), wherein the water level detection apparatus (300) comprises a water level detection element (310), which is installed on the inner cylinder (200), and the water level detection element (310) is provided with a water pressure probe (311), which is arranged on the inner side of the inner cylinder for acquiring the water pressure in the cylinder; and an air pressure detection apparatus, which is arranged on the outer side of the inner cylinder and acquires the current environmental air pressure by means of an air pressure probe (312). The water level detection element (310) determines the water level by means of the magnitude of the water pressure in the cylinder, and can also acquire the current environmental air pressure, thereby eliminating the effect of a change in the environmental air pressure on a water level detection result, such that the accuracy of the water level detection result can be improved.

Description

A drum washing machine

Technical field

The present invention belongs to the technical field of washing machines, and specifically relates to a drum washing machine.

Background technique

Existing drum washing machines generally include an inner cylinder and an outer cylinder, and a plurality of dehydration holes are provided on the wall of the inner cylinder. However, during the washing process, the washing water between the inner cylinder and the outer cylinder will not be used, resulting in a waste of this part of the washing water. At the same time, part of the dirt generated during the washing process will remain between the inner cylinder and the outer cylinder, making it difficult to clean. Long-term accumulation will pollute the wash water and affect the washing effect.

In order to solve the above problems, a washing machine is proposed that does not have a dewatering hole on the inner cylinder, so that the inner cylinder can independently hold the washing water during the washing process, thereby avoiding the situation of water accumulation between the inner and outer cylinders during the washing process. It saves the amount of washing water and also largely avoids the accumulation of dirt between the inner and outer cylinders.

However, since there is no water between the inner cylinder and the outer cylinder during the washing process, the water level cannot be detected by setting a water level detection device in the outer cylinder in a traditional washing machine. If the water level detection device is directly installed on the inner drum, since the inner drum needs to rotate during the washing process, the water level detection device will rotate with the inner drum. If the same method as a traditional washing machine is used, the water level detection device and the fixed control device will be installed. The system is directly connected through signal lines to realize the transmission of water level signals. The wiring method is relatively complicated and requires a large number of control cables between the inner cylinder and the outer cylinder, which may also affect the rotation of the inner cylinder.

In order to realize signal transmission between the moving water level detection device and the fixed control system, wireless communication technology is applied to the above-mentioned washing machine in the prior art, and the water level signal detected by the water level detection device is sent to the control system through wireless communication. , thereby controlling the operation of the washing machine. The detection principle of existing water level detection devices is mostly to detect the water pressure value and then further convert it into the corresponding water level value. However, the actual water pressure is often affected by the ambient air pressure. At the same water level, if the air pressure of the environment where the washing machine is located is different, the detected water pressure value will also be different, which will lead to the water level detection result being different from the actual There is an error between the water levels, which is not conducive to accurate control of the laundry water level.

In view of this, the present invention is proposed.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the deficiencies of the existing technology and provide a drum washing machine that can eliminate the influence of ambient air pressure on water level detection results.

In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is:

A drum washing machine includes an inner drum that independently holds water when washing clothes, and a water level detection module. The water level detection module includes a water level detection element installed on the inner drum. The water level detection element has:

The water pressure detection part is set inside the inner cylinder and is used to obtain the water pressure in the cylinder;

The air pressure detection part is set outside the inner cylinder and is used to obtain the current ambient air pressure.

Further, a protective shell is installed on the outside of the inner cylinder, and the part of the water level detection element located outside the inner cylinder is arranged inside the protective shell; the protective shell is provided with a connecting rod connecting the inner and outer sides of the protective shell. A first through hole, through which the air pressure detection part is connected to the external environment.

Further, the protective shell 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 facing away from the opening;

The protective cover is fastened to the opening of the protective box, and the protective cover is provided with a second through hole through which the water supply pressure detection part passes.

Furthermore, the outer periphery of the first through hole extends from the inner wall of the protective box to the inside of the protective box by a certain length to form a sleeve part, and the air pressure detection part is an air pressure probe inserted in the sleeve part.

Further, the inner wall of the sleeve portion near the extended end of the sleeve portion protrudes toward the inside of the sleeve portion to form an annular boss. A washer is set on the air pressure probe, and the washer and the annular boss face the inside of the protective box. surface contact.

Further, 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 protection device covering the water pressure probe is installed on the inside of the inner cylinder. Cover, a detection hole is provided on the protective cover to connect the water pressure probe with the inside of the inner cylinder.

Further, the outer circumference of the detection hole protrudes toward the inner wall of the inner cylinder to form a cylindrical portion, the water pressure probe is partially inserted in the cylindrical portion, and the detection end of the water pressure probe does not protrude from the protection. The surface of the cover facing away from the inner wall of the inner cylinder.

Further, a protective shell is installed on the outside of the inner cylinder, and the part of the water level detection element located outside the inner cylinder is arranged inside the protective shell;

The protective shell is provided with a mounting hole, the inner cylinder is provided with a third through hole corresponding to the mounting hole, and the protective cover is provided with a connecting portion corresponding to the mounting hole; the connecting pieces pass through the protective shell in sequence. The mounting hole and the third through hole are connected with the connecting part.

Further, a sealing member is provided between the protective cover and the inner wall of the inner cylinder, the sealing member has a sealing surface facing the inner wall of the inner cylinder, and the outer peripheral area of the sealing surface is in sealing fit with the inner wall of the inner cylinder; the installation port and the third through hole is located inside the area enclosed by the outer periphery of the sealing surface;

The sealing member has a sealing hole corresponding to the installation opening, the water pressure probe is inserted into the sealing hole, and the sealing hole is The inner wall is in sealing fit with the outer peripheral side wall of the water pressure probe.

Further, the drum washing machine also includes an outer cylinder, and the inner cylinder is arranged inside the outer cylinder; the water level detection module also includes a wireless power supply device, and the wireless power supply device includes:

The packaging shell 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 the lowest position;

A wireless power supply component is provided inside the packaging shell and used to supply power to the water level detection component.

After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art.

In the present invention, the water level detection element can simultaneously obtain the water pressure in the inner cylinder and the current external ambient air pressure to determine the water level in the cylinder. This eliminates the impact of changes in ambient air pressure on the water level detection results, thereby improving the efficiency of the water level detection. The accuracy of the water level detection results of drum washing machines is helpful to ensure the washing effect.

In the present invention, a protective shell is installed on the outside of the inner cylinder so that the air pressure detection part is located inside the protective shell, which can protect the air pressure detection part and prevent the air pressure detection part from being damaged due to vibration of the inner drum during the operation of the drum washing machine. Collision with surrounding structures, causing damage.

In the present invention, the water pressure probe located inside the inner cylinder is covered inside the protective cover, which prevents the water pressure probe from being damaged by the impact force of rolling clothing in the cylinder. The sealing member simultaneously covers the location of the installation opening and the third through hole on the inner wall of the inner cylinder, and achieves sealing by fitting the outer peripheral area with the inner wall of the inner cylinder, eliminating the trouble of setting up a separate sealing structure for each opening on the inner cylinder, simplifying The sealing structure of the inner cylinder also reduces the assembly process.

In the present invention, wireless power supply is used to power the water level detection element. The wireless power supply element is arranged inside the packaging case, and the packaging case is installed on the outer cylinder, which protects the wireless power supply element and ensures that the wireless power supply element No contact with washing water, safer and more reliable.

Specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

Description of the drawings

The drawings, as part of the present invention, are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the drawings in the following description are only some embodiments. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without exerting creative efforts. In the attached picture:

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

Figure 2 is a partial structural schematic diagram of the drum washing machine from another perspective according to the embodiment of the present invention;

Figure 3 is a schematic structural diagram of a water level detection device in an embodiment of the present invention;

Figure 4 is a schematic diagram of the A-A section in Figure 3 of the present invention;

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

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

Figure 7 is a schematic structural diagram of the front flange of the inner cylinder in the embodiment of the present invention;

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

In the picture: 100, outer cylinder; 101, front flange of outer cylinder; 200, inner cylinder; 201, front flange of inner cylinder; 202, installation 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, washer; 325, installation hole; 330, protection Cover; 331, second through hole; 332, groove; 333, claw; 340, protective cover; 341, detection hole; 342, cylindrical part; 343, screw column; 350, sealing gasket; 351, sealing hole; 352. Sealing part; 353. Fourth through hole; 400. Wireless power supply device; 410. Wireless power supply component; 420. Packaging box; 430. Packaging cover.

It should be noted that these drawings and text descriptions are not intended to limit the scope of the invention in any way, but are intended to illustrate the concept of the invention for those skilled in the art by referring to specific embodiments.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following examples are used to illustrate the present invention. , but are not used to limit the scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "inner", "outer", etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description. It does not indicate or imply that the device or element referred to must have a specific orientation or a specific orientation. construction and operation, and therefore should not be construed as limitations of the invention.

In the description of the present invention, it should be noted that, unless otherwise clearly stated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection. Connection, or integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood on a case-by-case basis.

As shown in FIGS. 1 to 8 , an embodiment of the present invention provides a drum washing machine, including an outer tub 100 and an inner tub 200 . Among them, the inner cylinder 200 is arranged in the outer cylinder 100 and can independently hold water when washing clothes.

Specifically, no dewatering hole is provided on the wall of the inner cylinder 200, and an inner cylinder door (not shown in the figure) is installed at the mouth of the cylinder. When washing clothes, the inner cylinder door is closed, so that the inner cylinder 200 is in a closed state and can independently contain washing water. During the washing/rinsing process, there is no water stored between the inner cylinder 200 and the outer cylinder 100, which can save washing water and avoid accumulation of dirt between the inner cylinder 200 and the outer cylinder 100.

In this embodiment, the inner cylinder 200 can drain water by providing a drainage hole on the wall of the inner cylinder 200 and installing a sealing assembly at the drainage hole. During the washing/rinsing process, the sealing assembly blocks the drainage hole, allowing the inner barrel 200 to independently hold water. During drainage, the inner cylinder 200 is controlled to reach a certain rotation speed, and the sealing assembly can open the drainage hole under the action of centrifugal force to realize the discharge of wash water. The outer tub 100 is connected to the drainage structure of the washing machine, and the water discharged from the inner tub 200 enters the outer tub 100 and then is discharged from the washing machine through the drainage structure.

The drum washing machine in this embodiment also includes a water level detection module. The water level detection module 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 . Among them, the wireless power supply device 400 can wirelessly supply power to the water level detection device 300 to make the water level detection device 300 work and obtain the water level in the inner cylinder 200 .

Specifically, the water level detection device 300 in this embodiment includes a water level detection element 310. The water level detection element 310 receives power from the wireless power supply device 400 to implement water level detection. The water level detection element 310 has a water pressure detection part and an air pressure detection part, wherein the water pressure detection part is arranged inside the inner cylinder 200 and is used to obtain the water pressure in the cylinder; the air pressure detection part is arranged outside the inner cylinder 200 and is used to To obtain the current ambient air pressure.

In this embodiment, the water level detection element 310 can obtain the water pressure inside the inner tube 200 and the current external ambient air pressure at the same time, and comprehensively determine the water level in the tube based on the water pressure inside the tube and the current ambient air pressure. In this way, the impact 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.

In one implementation of this embodiment, a gauge pressure liquid 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 cylinder 200 is determined based on the relative values of the pressures detected by the water pressure probe 311 and the air pressure probe 312, rather than the absolute value of the water pressure detected by the water pressure probe 311, which can improve the water level of the drum washing machine. The accuracy of detection helps ensure the washing effect of the drum washing machine by controlling the water level more accurately.

In the specific solution of this 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 to the lowest position with the inner cylinder 200, the water pressure probe of the water level detection element 310 311 is basically located at the lowest point in the inner cylinder 200, and the obtained water level detection structure is more accurate.

The water level detection device 300 is installed on the front flange 201 of the inner cylinder. Compared with the method of arranging the detection device on the wall of the inner cylinder 200, the water level detection element 310 can be reduced when the clothes are rolled and beaten in the inner cylinder 200. The impact caused by the pressure probe 311 prevents the water pressure probe 311 located inside the inner cylinder 200 from being damaged by the impact of clothing. At the same time, it also reduces the probability that the water pressure probe 311 is covered by the clothing inside the tube, thereby preventing the clothing inside the tube from affecting the accuracy of the water pressure detection result.

Correspondingly, in order to realize the wireless power supply of the wireless power supply device 400 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 is consistent with the water level detection device 300 when the inner cylinder 200 rotates to the lowest position. location correspondence.

Specifically, the water level detection element 310 includes a coil that can be mutually inducted with the wireless power supply device 400, and the wireless power supply device 400 can generate a changing magnetic field. When the water level detection element 310 rotates with the inner cylinder 200 and approaches the lowest point, it enters the coverage range of the magnetic field. The magnetic field excites a current in the coil, thereby providing electric energy to the water level detection element 310 so that the water level detection element 310 can work and obtain the internal content. Water level information in the cylinder 200.

In another solution of this embodiment, the water level detection device can also be installed on the rear flange of the inner cylinder, and the wireless power supply device is correspondingly installed on the rear flange of the outer cylinder, which can also achieve a similar effect.

In a further solution of this embodiment, the water level detection device 300 further includes a protective housing installed outside the inner cylinder 200, and the portion of the water level detection element 310 located outside the inner cylinder 200 is disposed inside the protective housing. Specifically, the protective shell is installed on the outer surface of the front flange 201 of the inner cylinder. The part of the water level detection element 310 located outside the inner cylinder 200 includes an air pressure probe 312, a coil receiving power from the wireless power supply device 400 and other electronic components. The above-mentioned electronic components are arranged inside the protective shell to prevent them from being directly exposed to the outside of the inner cylinder 200, which can play a certain protective role.

For example, during the operation of the drum washing machine, the inner drum 200 may vibrate to a large extent. The existence of the protective shell can prevent electronic components such as the air pressure probe 312 from colliding with the outer drum 100 or other structures due to the vibration of the inner drum 200. Impact damage to electronic components such as the air pressure probe 312 is avoided. On the other hand, the water discharged from the inner cylinder 200 enters the outer cylinder 100. The arrangement of the protective shell can especially prevent the coils and the like from being directly immersed in the drainage water, causing short circuit damage.

In this embodiment, the protective shell 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 inner cylinder front flange 201. The protective cover 330 The opening of the protective box 320 is fastened to form a relatively closed space between the protective box 320 and the protective cover 330 .

Specifically, a plurality of claws 333 are provided on the outer periphery of the protective cover 330, and the claws 333 engage with the open edge of the protective box 320 to achieve relative fixation of the protective box 320 and the protective cover 330.

In order to achieve the water pressure probe 311 and the air pressure probe 312 of the water level detection element 310 to obtain the water pressure in the cylinder and the current ambient air pressure respectively, a third connecting rod is provided on the surface of the protective box 320 facing away from the open opening, which connects the inner and outer sides of the protective box 320. A through hole 321. The air pressure probe 312 is connected to the external environment through the first through hole 321, so that the current ambient air pressure can be detected. The protective cover 330 is provided with a second through hole 331, and the water pressure probe 311 passes through the second through hole 331. An installation port 202 is provided on the front flange 201 of the inner cylinder, and the water pressure probe 311 extends into the inner cylinder 200 through the installation port 202.

In this embodiment, a plurality of protruding mutually perpendicular reinforcing ribs are provided on the inner surface of the protective cover 330 , 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 part of the water level detection element 310.

Further, the outer periphery of the first through hole 321 extends from the inner wall of the protective box 320 to the inside of the protective box 320 to form a sleeve part 322 for a certain length. The air pressure probe 312 is inserted into the sleeve part 322, and the detection end of the air pressure probe 312 (i.e. The lower end of the air pressure probe 312 in Figure 4 does not protrude from the outer surface of the protective box 320.

In the above solution, the air pressure probe 312 is inserted in the sleeve part 322 and can communicate with the outside of the protective box 320 through the first through hole 321, so that the purpose of obtaining the current ambient air pressure can be achieved. The detection end of the air pressure probe 312 is flush with the outer surface of the protective box 320, or is slightly recessed in the outer surface of the protective box 320, which can effectively protect the detection end of the air pressure probe 312 and prevent the air pressure probe 312 from colliding with the structure of the outer cylinder 100. Collision. The arrangement of the sleeve part 322 cooperates with the air pressure probe 312 and also facilitates the positioning of the water level detection element 310 and the protective box 320 when they are assembled.

In a further solution of this embodiment, the inner wall of the sleeve part 322 protrudes toward the inside of the sleeve part 322 to form an annular boss 323 at a position close to the extended end of the sleeve part 322 , and a gasket 324 is set on the air pressure probe 312 . The air pressure probe 312 is inserted into the sleeve portion 322 , and the gasket 324 is in contact with the surface of the annular boss 323 facing the inside of the protective box 320 .

Specifically, the gasket 324 is clamped between the annular boss 323 and the main body portion of the water level detection element 310 .

Preferably, the outer diameter of the gasket 324 is just equal to, or slightly smaller than, the inner diameter of the sleeve portion 322 .

In the above solution, by fitting the gasket 324 on the air pressure probe 312, on the one hand, the air pressure probe 312 can be fixed without direct contact between the air pressure probe 312 and the sleeve portion 322, thereby preventing the air pressure probe 312 from being in contact with the sleeve. Collision occurs between the barrel portions 322 and damage occurs. On the other hand, there is a gap between the outer peripheral side wall of the air pressure probe 312 and the inner wall of the sleeve portion 322. The gasket 324 can also seal the gap to prevent the water in the outer cylinder 100 from passing through the first drain during the drainage process. The through hole 321 is filled into the inside of the protective box 320, causing the internal electronic components to be damaged by water immersion.

In this embodiment, the water level detection device 300 also includes a protection structure provided for the water pressure probe 311. Specifically, a protective cover 340 covering the water pressure probe 311 is installed inside the inner cylinder 200, and a detection hole 341 is opened in the protective cover 340 to allow water to flow through. The pressure probe 311 is connected with the inside of the inner cylinder 200 .

The arrangement of the protective cover 340 prevents the clothes inside the tube from hitting the water pressure probe 311 during rolling and beating, thereby protecting the water pressure probe 311 from being easily damaged.

Further, the outer circumference of the detection hole 341 protrudes toward the inner wall of the inner cylinder 200, that is, the inner surface of the inner cylinder front flange 201 to form a cylindrical portion 342. The water pressure probe 311 is partially inserted in the cylindrical portion 342, and the water pressure The detection end of the probe 311 (ie, the upper end of the water pressure probe 311 in Figure 4) does not protrude from the surface of the protective cover 340 facing away from the inner cylinder front flange 201.

In the above solution, the cylindrical portion 342 on the protective cover 340 completely surrounds the detection end of the water pressure probe 311, and the water in the inner cylinder 200 can contact the water pressure probe 311 through the detection hole 341 and the cylindrical portion 342, thereby realizing the water pressure probe 311. The pressure probe 311 detects the water pressure in the cylinder. However, the clothes in the tube can only cover the surface of the protective cover 340 and will not impact or scratch the water pressure probe 311.

In this embodiment, the outer protective box 320 and the inner protective cover 340 are connected as a whole by the connecting piece passing through the front flange 201 of the inner cylinder, thereby realizing the installation of the water level detection device 300 .

Specifically, the protective box 320 is provided with a mounting hole 325, the inner cylinder front flange 201 is provided with a third through hole 203 corresponding to the mounting hole 325, and the protective cover 340 is provided with a connecting portion corresponding to the mounting hole 325. The connecting piece passes through the mounting hole 325 and the third through hole 203 from the outside of the protective box 320 in sequence, and is connected to the connecting portion to complete the installation of the water level detection device 300 .

In detail, the protective box 320 is provided with mounting holes 325 with stepped inner walls near both ends, the connecting members are screws, and the connecting parts on the protective cover 340 are screw posts 343. The screw column 343 is inserted into the third through hole 203 on the front flange 201 of the inner cylinder. The screw penetrates through the mounting hole 325 on the protective box 320. One end of the screw is fixed against the inner wall of the ladder structure of the mounting hole 325, and the other end Screw into screw post 343.

Through the above structure, there is no need to separately fix the protective box 320 and the protective cover 340 on the inner cylinder front flange 201, which simplifies the installation operation of the water level detection device 300.

In a further solution of this embodiment, a seal is provided between the protective cover 340 and the inner cylinder front flange 201 to prevent water leakage at the installation port 202 and the third through hole 203 on the inner cylinder front flange 201 .

Specifically, the sealing member is a sealing gasket 350. The sealing gasket 350 has a sealing surface facing the inner cylinder front flange 201. The outer circumference of the sealing surface protrudes toward the inner cylinder front flange 201 to form a sealing portion 352. Through the sealing portion 352 is in sealing fit with the inner surface of the inner cylinder front flange 201, so that water in the inner cylinder 200 will not penetrate between the sealing gasket 350 and the inner cylinder front flange 201. The installation opening 202 and the third through hole 203 are both located within the area enclosed by the sealing portion 352 on the front flange 201 of the inner cylinder, thereby preventing water in the inner cylinder 200 from leaking through the installation opening 202 and the third through hole 203.

Since the water pressure probe 311 needs to be in contact with the water in the inner cylinder 200, the sealing gasket 350 is installed on the front flange 201 of the inner cylinder. A sealing hole 351 is provided at the position of the mounting port 202 . The water pressure probe 311 is installed in the sealing hole 351, and the inner wall of the sealing hole 351 is in sealing fit with the outer peripheral side wall of the water pressure probe 311, so that there will be no water seepage between the sealing hole 351 and the water pressure probe 311, and there will be no Water penetrates between the sealing gasket 350 and the inner cylinder front flange 201 through the sealing hole 351.

Further, the sealing gasket 350 is also provided with a fourth through hole 353 for the screw column 343 to pass through. In order to prevent the water in the inner cylinder 200 from entering between the sealing gasket 350 and the inner cylinder front flange 201 through the fourth through hole 353, thereby causing water leakage at the installation port 202 or the third through hole 203, the protective cover 340 and the sealing gasket are At least the area surrounding the fourth through hole 353 needs to be sealed between 350 .

In the specific solution of this embodiment, the surface of the sealing gasket 350 facing the protective cover 340 is in sealing fit with the protective cover 340 along its outer circumference. At the same time, the end surface of the cylindrical portion 342 on the protective cover 340 is in sealing fit with the sealing gasket 350 .

Through the above structure, the sealing effect after the water level detection device 300 is installed on the front flange 201 of the inner cylinder can be effectively ensured, and water leakage of the inner cylinder 200 can be avoided.

In a further solution of this embodiment, the wireless power supply device 400 installed on the outer barrel 100 includes a packaging shell, and a wireless power supply element 410 disposed inside the packaging shell. The wireless power supply element 410 is used to generate a changeable magnetic field to detect water levels. Component 310 is powered.

The packaging shell specifically includes a packaging box 420 and a packaging cover 430, which are fastened together to package the wireless power supply element 410 inside, thereby protecting the wireless power supply element 410. Even if water leakage occurs in the drum washing machine, 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.

In a further solution of this embodiment, the water level detection module further includes a signal feedback device. The signal feedback device specifically includes a signal sending element provided on the inner cylinder 200 and electrically connected to the water level detection element 310, and a signal sending element. The signal receiving component of the component communication connection.

In the above solution, the signal transmitting element is electrically connected to the water level detecting element 310, and can obtain the detection result of the water level in the inner cylinder 200 by the water level detecting element 310, and then send it to the signal receiving element through wireless communication. The signal sending element is wired to the water level detection element 310 to obtain the water level detection result, and needs to be arranged on the inner cylinder 200 in conjunction with the water level detection element 310 . The signal receiving element is electrically connected to the control system of the drum washing machine, and transmits the received water level detection result to the control system for controlling the operation of the drum washing machine. The water level detection module realizes information transmission through a wireless communication connection between the signal sending element and the signal receiving element, saving the layout of connecting cables and avoiding the problem of complicated internal wiring structure of the drum washing machine.

In the preferred solution of this embodiment, the signal sending element is located outside the inner cylinder 200 and is connected with the water level detection element 310 In the integrated arrangement, the signal transmitting element is also arranged inside the protective housing composed of the protective box 320 and the protective cover 330 . Similarly, the signal receiving element and the wireless power supply element 410 are integrated and packaged together inside the packaging shell composed of the packaging box 420 and the packaging cover 430 .

In the above solution, the signal transmitting element and the water level detecting element 310, and the signal receiving element and the wireless power supply element 410 are respectively integrated, simplifying the overall structure of the water level detecting module, thereby simplifying the assembly process of the drum washing machine. The signal transmitting element is integrated with the water level detecting element 310, and the wireless power supply element 410 supplies power to the water level detecting element 310 and the signal transmitting element simultaneously. When the signal sending element and the water level detecting element 310 rotate with the inner cylinder 200 to the coverage area of the magnetic field generated by the wireless power supply element 410, that is, close to the lowest position, the wireless power supply element 410 can send signals to the signal sending element and the water level detecting element 310. When power is supplied, the water level detection element 310 detects the water level height in the inner cylinder 200, and sends the detection result to the signal receiving element through the signal sending element, so that the control system can obtain the water level height in the inner cylinder 200.

In this embodiment, the water level detection element 310 can simultaneously obtain the water pressure in the inner cylinder 200 and the current ambient air pressure outside the inner cylinder 200, and determine the water level height in the inner cylinder 200 by comparing the obtained water pressure value and air pressure value. It can eliminate the influence of ambient air pressure changes on the water level detection results and improve the accuracy of the drum washing machine in detecting the water level height in the inner drum 200 .

A protective cover 340 for protecting the water pressure probe 311 is installed on the inside of the inner cylinder 200, and a protective shell composed of a protective box 320 and a protective cover 330 is installed on the outside of the inner cylinder 200 to protect the air pressure probe 312, ensuring that the water pressure probe 311 and air pressure are The probe 312 will not be damaged easily, thus ensuring the accuracy of the water level detection results. The part of the water level detection element 310 located outside the inner cylinder 200 is entirely located inside the protective shell, which also ensures that the electronic components will not be immersed in water when the inner cylinder 200 drains water to the outer cylinder 100, thus preventing the electronic components from being damaged by water immersion.

The above are only preferred embodiments of the present invention, and do not limit the present invention in any form. Although the present invention has been disclosed above in preferred embodiments, it is not intended to limit the present invention. Anyone familiar with the technology of this patent Without departing from the scope of the technical solution of the present invention, personnel can make some changes or modify the above-mentioned technical contents into equivalent embodiments with equivalent changes. In essence, any simple modifications, equivalent changes and modifications made to the above embodiments still fall within the scope of the present invention.

Claims

A drum washing machine includes an inner drum that independently holds water when washing clothes, and a water level detection module. The water level detection module includes a water level detection element installed on the inner drum. It is characterized in that the water level detection element has:

The water pressure detection part is set inside the inner cylinder and is used to obtain the water pressure in the cylinder;

The air pressure detection part is set outside the inner cylinder and is used to obtain the current ambient air pressure.
The drum washing machine according to claim 1, characterized in that a protective shell is installed on the outside of the inner drum, and the part of the water level detection element located outside the inner drum is arranged inside the protective shell; the protective shell A first through hole connecting the inner and outer sides of the protective housing is provided on the body, and the air pressure detection part is connected to the external environment through the first through hole.
The drum washing machine according to claim 2, characterized in that the protective shell 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 facing away from the opening;

The protective cover is fastened to the opening of the protective box, and the protective cover is provided with a second through hole through which the water supply pressure detection part passes.
The drum washing machine according to claim 3, wherein the outer periphery of the first through hole extends from the inner wall of the protective box to the inside of the protective box to form a sleeve part, and the air pressure detection part is inserted into the protective box. Air pressure probe in sleeve part.
The drum washing machine according to claim 4, wherein the inner wall of the sleeve portion protrudes toward the interior of the sleeve portion to form an annular boss near the extended end of the sleeve portion, and a washer is set on the air pressure probe. The gasket is in contact with the surface of the annular boss facing the inside of the protective box.
The drum washing machine according to any one of claims 1 to 5, characterized in that an installation port is provided on the inner cylinder, and the water pressure detection part is a water pressure sensor that passes through the installation port and extends into the inner cylinder. Probe; a protective cover covering the water pressure probe is installed on the inside of the inner cylinder, and a detection hole is provided on the protective cover to connect the water pressure probe with the inside of the inner cylinder.
The drum washing machine according to claim 6, wherein the outer circumference of the detection hole protrudes toward the inner wall of the inner cylinder to form a cylindrical portion, and the water pressure probe is partially inserted into the cylindrical portion, and the water pressure The detection end of the probe does not protrude from the surface of the protective cover facing away from the inner wall of the inner cylinder.
The drum washing machine according to claim 6 or 7, characterized in that a protective shell is installed on the outside of the inner cylinder, and the part of the water level detection element located outside the inner cylinder is arranged inside the protective shell;

The protective shell is provided with a mounting hole, the inner cylinder is provided with a third through hole corresponding to the mounting hole, and the protective cover is provided with a connecting portion corresponding to the mounting hole; the connecting pieces pass through the protective shell in sequence. The mounting hole and the third through hole are connected with the connecting part.
The drum washing machine according to claim 8, wherein a protective cover is provided between the protective cover and the inner wall of the inner drum. Seal, the seal has a sealing surface facing the inner wall of the inner cylinder, the outer peripheral area of the sealing surface is in sealing fit with the inner wall of the inner cylinder; the installation port and the third through hole are located in the area surrounded by the outer periphery of the sealing surface internal;

The sealing member has a sealing hole corresponding to the installation opening, the water pressure probe is inserted into the sealing hole, and the inner wall of the sealing hole is sealingly fitted to the outer peripheral side wall of the water pressure probe.
The drum washing machine according to any one of claims 1 to 9, characterized in that the drum washing machine further includes an outer drum, and the inner drum is arranged inside the outer drum; the water level detection module further includes a wireless power supply device, so The wireless power supply device includes:

The packaging shell 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 the lowest position;

A wireless power supply component is provided inside the packaging shell and used to supply power to the water level detection component.