CN116770555A

CN116770555A - Drum washing machine

Info

Publication number: CN116770555A
Application number: CN202210231621.5A
Authority: CN
Inventors: 刘凯; 于明亮; 刘晓春; 侯永顺
Original assignee: Qingdao Haier Washing Machine Co Ltd; Haier Smart Home Co Ltd
Current assignee: Qingdao Haier Washing Machine Co Ltd; Haier Smart Home Co Ltd
Priority date: 2022-03-10
Filing date: 2022-03-10
Publication date: 2023-09-19
Also published as: WO2023169156A1

Abstract

The invention 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 arranged on the inner drum, and the water level detection element comprises: the water pressure detection part is arranged at the inner side of the inner cylinder and is used for acquiring the water pressure in the cylinder; the air pressure detection part is arranged on the outer side of the inner cylinder and used for acquiring the current ambient air pressure. In the invention, the water level detection element judges the water level condition according to the water pressure in the cylinder, and can acquire the current ambient air pressure at the same time, thereby eliminating the influence of the ambient air pressure change on the water level detection result and improving the accuracy of the water level detection result.

Description

Drum washing machine

Technical Field

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

Background

The prior drum washing machine generally comprises an inner drum and an outer drum, wherein a plurality of dehydration holes are arranged on the wall of the inner drum. However, in the washing process, the washing water between the inner cylinder and the outer cylinder is not utilized, so that the waste of the washing water is caused. Meanwhile, part of dirt generated in the washing process can remain between the inner cylinder and the outer cylinder, so that the dirt is difficult to clean, and long-term accumulation can pollute washing water and affect the washing effect.

In order to solve the problems, a washing machine with an inner cylinder without a dewatering hole is provided, so that the inner cylinder can independently hold washing water in the washing process, the situation of water storage between the inner cylinder and the outer cylinder in the washing process can be avoided, the consumption of the washing water is saved, and the situation of dirt accumulation between the inner cylinder and the outer cylinder is avoided to a great extent.

However, since there is no water between the inner tub and the outer tub in the washing process, it is impossible to detect the water level by means of a water level detecting device provided in the outer tub in the conventional washing machine. If install water level detection device directly on the inner tube, because the inner tube needs to rotate in the washing process for water level detection device rotates along with the inner tube together, if adopt with traditional washing machine the same mode, directly pass through signal line connection with the control system that fixes the setting with water level detection device, realize water level signal's transmission, it is comparatively complicated to walk the line mode, needs to set up a large amount of control cables between inner tube and urceolus, still probably causes the influence to the rotation of inner tube.

In order to realize signal transmission between the moving water level detection device and the fixed control system, the wireless communication technology is applied to the washing machine in the prior art, and the water level signal detected by the water level detection device is sent to the control system in a wireless communication mode, so that the operation of the washing machine is controlled. The detection principle of the existing water level detection device is mostly that the water pressure value is detected and then converted into a corresponding water level value. However, the actual water pressure is often affected by the air pressure of the environment, and under the same water level, the air pressure of the environment where the washing machine is located is different, and the detected water pressure values are different, so that an error exists between the obtained water level detection result and the actual water level, and the accurate control of the washing water level is not facilitated.

In view of this, the present invention has been made.

Disclosure of Invention

The invention aims to solve the technical problem of overcoming the defects of the prior art and providing a drum washing machine capable of eliminating the influence of ambient air pressure on a water level detection result.

In order to solve the technical problems, the invention adopts the basic conception of the technical scheme that:

a drum washing machine comprising an inner tub for independently holding water while washing laundry, and a water level detection module including a water level detection element mounted on the inner tub, the water level detection element having:

the water pressure detection part is arranged at the inner side of the inner cylinder and is used for acquiring the water pressure in the cylinder;

the air pressure detection part is arranged on the outer side of the inner cylinder and used for acquiring the current ambient air pressure.

Further, a protective shell is arranged on the outer side of the inner cylinder, and the part of the water level detection element, which is positioned on the outer side of the inner cylinder, is arranged in the protective shell; the protection shell is provided with a first through hole communicated with the inner side and the outer side of the protection shell, and the air pressure detection part is communicated with the external environment through the first through hole.

Further, the protective housing includes:

the protection box is provided with an opening facing the outer wall of the inner cylinder, and the first through hole is formed in the surface of the protection box facing away from the opening;

the protective cover is buckled on the opening of the protective box, and a second through hole for the water pressure detection part to penetrate out is formed in the protective cover.

Further, the periphery of the first through hole extends to a certain length from the inner wall of the protection box to the inside of the protection box to form a sleeve part, and the air pressure detection part is an air pressure probe inserted into the sleeve part.

Further, the inner wall of the sleeve part is close to the position of the extending tail end of the sleeve part and protrudes towards the inside of the sleeve part to form an annular boss, a gasket is sleeved on the air pressure probe, and the gasket is abutted with the surface of the annular boss, which faces towards the inside of the protection box.

Further, an installation opening is formed in the inner cylinder, and the water pressure detection part is a water pressure probe penetrating through the installation opening and extending into the inner cylinder; the inner side of the inner cylinder is provided with a protective cover for covering the water pressure probe, and the protective cover is provided with a detection hole for communicating the water pressure probe with the inner cylinder.

Further, the outer circumference of the detection hole protrudes to form a cylindrical part on the inner wall of the inner cylinder, the water pressure probe is partially inserted into the cylindrical part, and the detection end of the water pressure probe is not protruded out of the surface of the protective cover, which is opposite to the inner wall of the inner cylinder.

Further, a protective shell is arranged on the outer side of the inner cylinder, and the part of the water level detection element, which is positioned on the outer side of the inner cylinder, is arranged in the protective shell;

a mounting hole is formed in the protective shell, a third through hole corresponding to the mounting Kong Kaishe is formed in the inner cylinder, and a connecting part is arranged on the protective cover corresponding to the mounting hole; the connecting piece sequentially passes through the mounting hole and the third through hole from the outside of the protective shell and is connected with the connecting part.

Further, a sealing piece is arranged between the protective cover and the inner wall of the inner cylinder, the sealing piece is provided with a sealing surface facing the inner wall of the inner cylinder, and the peripheral area of the sealing surface is in sealing fit with the inner wall of the inner cylinder; the mounting port and the third through hole are positioned in an area surrounded by the periphery of the sealing surface;

the sealing piece is provided with a sealing hole corresponding to the mounting opening, the water pressure probe penetrates through the sealing hole, and the inner wall of the sealing hole is in sealing fit with the peripheral side wall of the water pressure probe.

Further, the drum washing machine further comprises an outer drum, and the inner drum is arranged in the outer drum; the water level detection module further comprises a wireless power supply device, and the wireless power supply device comprises:

the packaging shell is arranged on the outer cylinder, and the installation position corresponds to the position when the water level detection element rotates to the lowest position along with the inner cylinder;

and the wireless power supply element is arranged inside the packaging shell and is used for supplying power to the water level detection element.

By adopting the technical scheme, compared with the prior art, the invention has the following beneficial effects.

In the invention, the water level detection element can simultaneously acquire the water pressure in the inner cylinder and the current external ambient air pressure for judging the water level condition in the cylinder, so that the influence of the ambient air pressure change on the water level detection result is eliminated, the accuracy of the water level detection result of the drum washing machine is improved, and the washing effect is ensured.

According to the invention, the protective shell is arranged on the outer side of the inner cylinder, so that the air pressure detection part is positioned in the protective shell, the air pressure detection part can be protected, and the situation that the air pressure detection part collides with surrounding structures to cause damage due to vibration of the inner cylinder in the running process of the drum washing machine is prevented.

According to the invention, the water pressure probe positioned in the inner cylinder is covered in the protective cover, so that the water pressure probe is prevented from being damaged by the tumbling impact force of the underwear in the cylinder. The sealing piece covers the positions of the mounting opening and the third through hole on the inner wall of the inner barrel simultaneously, sealing is realized through the lamination of the peripheral area and the inner wall of the inner barrel, the trouble of arranging a sealing structure for each opening on the inner barrel is omitted, the sealing structure of the inner barrel is simplified, and meanwhile, the assembly process is reduced.

According to the invention, a wireless power supply mode is adopted to supply power to the water level detection element, wherein the wireless power supply element is arranged inside the packaging shell, and the packaging shell is arranged on the outer cylinder, so that the wireless power supply element is protected, the wireless power supply element is prevented from contacting washing water, and the water level detection element is safer and more reliable.

The following describes the embodiments of the present invention in further detail with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. It is evident that the drawings in the following description are only examples, from which other drawings can be obtained by a person skilled in the art without the inventive effort. In the drawings:

fig. 1 is a schematic view showing a part of a drum washing machine in accordance with an embodiment of the present invention;

FIG. 2 is a schematic view showing a part of a drum washing machine according to another view angle of the embodiment of the present invention;

FIG. 3 is a schematic view of a water level detecting apparatus according to an embodiment of the present invention;

FIG. 4 is a schematic view of the section A-A of FIG. 3 in accordance with the present invention;

fig. 5 is an exploded view of a water level detecting apparatus in an embodiment of the present invention;

FIG. 6 is a schematic view of a water level detection device mounted on a front flange of an inner barrel according to an embodiment of the present invention;

FIG. 7 is a schematic view of the front flange of the inner barrel according to an embodiment of the present invention;

fig. 8 is an exploded view of a wireless power supply in an embodiment of the present invention.

In the figure: 100. an outer cylinder; 101. a front flange of the outer cylinder; 200. an inner cylinder; 201. an inner barrel front flange; 202. a mounting port; 203. a third through hole; 300. a water level detecting device; 310. a water level detecting element; 311. a water pressure probe; 312. an air pressure probe; 320. a protective case; 321. a first through hole; 322. a sleeve portion; 323. an annular boss; 324. a gasket; 325. a mounting hole; 330. a protective cover; 331. a second through hole; 332. a groove; 333. a claw; 340. a protective cover; 341. a detection hole; 342. a cylindrical portion; 343. a screw post; 350. a sealing gasket; 351. sealing the hole; 352. a sealing part; 353. a fourth through hole; 400. a wireless power supply device; 410. a wireless power supply element; 420. packaging the box; 430. and (5) packaging the cover.

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

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions in the embodiments will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention, and the following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

As shown in fig. 1 to 8, an embodiment of the present invention provides a drum washing machine including an tub 100 and an inner tub 200. Wherein, the inner tub 200 is disposed in the outer tub 100, and can independently hold water when washing laundry.

Specifically, no dehydration holes are arranged on the wall of the inner cylinder 200, and an inner cylinder door (not shown in the figure) is arranged at the cylinder opening. When washing clothes, the inner barrel door is closed, so that the inner barrel 200 is in a closed state, and washing water can be independently contained. In the washing/rinsing process, no water exists between the inner barrel 200 and the outer barrel 100, so that the purposes of saving the water consumption for washing and avoiding the accumulation of dirt between the inner barrel 200 and the outer barrel 100 can be realized.

In this embodiment, the inner cylinder 200 may be drained by providing a drain hole in the wall of the inner cylinder 200 and installing a sealing assembly at the drain hole. During the washing/rinsing process, the sealing assembly seals the drain hole so that the inner tub 200 independently holds water. When the washing water is discharged, the inner cylinder 200 is controlled to reach a certain rotating speed, and the sealing assembly can open the water discharge hole under the action of centrifugal force, so that the washing water is discharged. The outer tub 100 communicates with a drain structure of the washing machine, and water discharged from the inner tub 200 enters the outer tub 100 and is discharged out of the washing machine through the drain structure.

The drum washing machine of the present embodiment further includes a water level detection module, which specifically includes a water level detection device 300 mounted on the inner tub 200, and a wireless power supply device 400 mounted on the outer tub 100. The wireless power supply device 400 can wirelessly supply power to the water level detection device 300, so that the water level detection device 300 works to obtain the water level height in the inner cylinder 200.

Specifically, the water level detecting device 300 in the present embodiment includes a water level detecting element 310, and the water level detecting element 310 receives power from the wireless power supply device 400 to achieve water level detection. The water level detecting element 310 has a water pressure detecting portion and a gas pressure detecting portion, wherein the water pressure detecting portion is disposed inside the inner cylinder 200 for obtaining the water pressure in the cylinder; the air pressure detection part is arranged outside the inner cylinder 200 and is used for acquiring the current ambient air pressure.

In this embodiment, the water level detecting element 310 can simultaneously obtain the water pressure in the inner cylinder 200 and the current external ambient air pressure, and comprehensively determine the water level in the cylinder according to the water pressure in the cylinder and the current ambient air pressure. In this way, the influence of the change of the ambient air pressure on the actual value of the detected water pressure can be eliminated, and the problem that the water level detection result is influenced by different ambient air pressures is avoided.

In one implementation of this embodiment, a gauge pressure type liquid level sensor is used as the water level detecting element 310, the water pressure detecting portion is a water pressure probe 311, and the air pressure detecting portion is an air pressure probe 312. The actual water level in the inner cylinder 200 is judged according to the relative value of the pressure detected by the water pressure probe 311 and the air pressure probe 312, instead of judging the water level by the absolute value of the water pressure detected by the water pressure probe 311, the accuracy of the water level detection of the drum washing machine can be improved, and the washing effect of the drum washing machine can be guaranteed by controlling the water level more accurately.

In the embodiment of the present embodiment, the water level detecting means 300 is installed on the inner tub front flange 201 near the outer circumference of the inner tub 200. When the water level detecting device 300 rotates to the lowest position along with the inner cylinder 200, the water pressure probe 311 of the water level detecting element 310 is basically positioned at the lowest position in the inner cylinder 200, and the obtained water level detecting structure is more accurate.

The water level detecting device 300 is mounted on the inner drum front flange 201, compared with the mode of arranging the detecting device on the drum wall of the inner drum 200, the impact on the water pressure probe 311 of the water level detecting element 310 when clothes tumble in the inner drum 200 can be reduced, and the water pressure probe 311 positioned on the inner side of the inner drum 200 is prevented from being damaged by the clothes. Meanwhile, the probability that the water pressure probe 311 is covered by the underwear is also reduced, so that the underwear can be prevented from influencing the accuracy of the water pressure detection result.

Accordingly, in order to achieve wireless power supply of the wireless power supply device 400 to the water level detecting element 310, the wireless power supply device 400 is disposed on the outer tub front flange 101, and its installation position corresponds to a position when the water level detecting device 300 rotates to the lowest position with the inner tub 200.

Specifically, the water level detecting element 310 includes a coil that can be mutually induced with the wireless power supply 400, and the wireless power supply 400 can generate a varying magnetic field. The water level detecting element 310 enters the coverage of the magnetic field when rotating along with the inner cylinder 200 to be close to the lowest position, and the magnetic field excites current in the coil, so that the water level detecting element 310 is supplied with electric energy, and the water level detecting element 310 can work and acquire water level information in the inner cylinder 200.

In another scheme of the embodiment, the water level detection device can 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, so that a similar effect can be achieved.

In a further aspect of this embodiment, the water level detection apparatus 300 further includes a protective housing installed outside the inner cylinder 200, and a portion of the water level detection element 310 located outside the inner cylinder 200 is disposed inside the protective housing. Specifically, the protecting housing is mounted on the outer surface of the inner barrel front flange 201, the portion of the water level detecting element 310 located outside the inner barrel 200 includes an air pressure probe 312, and electronic elements such as a coil for receiving power supplied by the wireless power supply device 400, and the electronic elements are disposed inside the protecting housing, so that the electronic elements are prevented from being directly exposed outside the inner barrel 200, and a certain protecting effect can be achieved.

For example, during the operation of the drum washing machine, the inner drum 200 may generate larger vibration, and the existence of the protective housing can avoid the situation that the electronic components such as the air pressure probe 312 collide with the outer drum 100 or other structures along with the vibration of the inner drum 200, so as to avoid the impact damage to the electronic components such as the air pressure probe 312. On the other hand, the water flow discharged from the inner cylinder 200 enters the outer cylinder 100, and the arrangement of the protective shell can particularly avoid the problem of short circuit damage caused by directly soaking the coil and the like in the water flow.

In this embodiment, the protection casing specifically includes a protection box 320 and a protection cover 330, where the protection box 320 has an opening facing the outer wall of the inner cylinder 200, that is, the front side surface of the inner cylinder front flange 201, and the protection cover 330 is buckled with the opening of the protection box 320, so that a relatively closed space is formed between the protection box 320 and the protection cover 330.

Specifically, the periphery of the protective cover 330 is provided with a plurality of claws 333, and the protective box 320 and the protective cover 330 are relatively fixed by clamping the claws 333 with the open edge of the protective box 320.

In order to achieve the purpose that the water pressure probe 311 and the air pressure probe 312 of the water level detection element 310 respectively acquire the water pressure in the cylinder and the current ambient air pressure, a first through hole 321 which is communicated with the inner side and the outer side of the protective box 320 is arranged on the surface of the protective box 320, which is back to the opening, and the air pressure probe 312 is communicated with the external environment through the first through hole 321, so that the current ambient air pressure can be detected. The protecting cover 330 is provided with a second through hole 331, and the water pressure probe 311 penetrates out of the second through hole 331. The inner cylinder front flange 201 is provided with a mounting opening 202, and the water pressure probe 311 passes through the mounting opening 202 and stretches into the inner cylinder 200.

In this embodiment, the inner side surface of the protecting cover 330 is provided with a plurality of protruding reinforcing ribs perpendicular to each other, 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 for avoiding the main body of the water level detecting element 310.

Further, the outer circumference of the first through hole 321 extends from the inner wall of the protection box 320 to a certain length inside the protection 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. the lower end of the air pressure probe 312 in fig. 4) does not protrude from the outer surface of the protection box 320.

In the above-mentioned scheme, the air pressure probe 312 is inserted into the sleeve portion 322 and can be externally communicated with the protection box 320 through the first through hole 321, so that the purpose of acquiring 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 protection box 320, or slightly recessed in the outer surface of the protection box 320, so that the detection end of the air pressure probe 312 can be effectively protected, and the air pressure probe 312 is prevented from colliding with the outer cylinder 100. The sleeve portion 322 is provided to cooperate with the air pressure probe 312 to also facilitate positioning of the water level detecting member 310 when assembled with the shield case 320.

In a further embodiment of the present invention, the inner wall of the sleeve portion 322 protrudes into the sleeve portion 322 at a position near the extending end of the sleeve portion 322 to form an annular boss 323, and the air pressure probe 312 is sleeved with a gasket 324. The air pressure probe 312 is inserted into the sleeve portion 322, and the gasket 324 abuts against the surface of the annular boss 323 facing the inside of the shield case 320.

Specifically, the gasket 324 is sandwiched between the annular boss 323 and the body portion of the water level detecting member 310.

Preferably, the outer peripheral diameter of the washer 324 is just equal to, or slightly less than, the inner diameter of the sleeve portion 322.

In the above-mentioned scheme, through the suit packing ring 324 on air pressure probe 312, on the one hand can realize the fixed to air pressure probe 312 under the condition that does not have direct contact between air pressure probe 312 and sleeve portion 322, avoid producing between air pressure probe 312 and sleeve portion 322 and collide with and then take place the damage. On the other hand, a gap exists between the outer circumferential side wall of the air pressure probe 312 and the inner wall of the sleeve portion 322, and the gasket 324 can also play a sealing role on the gap, so that water in the outer cylinder 100 is prevented from being poured into the protective box 320 through the first through hole 321 in the water draining process, and the electronic components in the protective box are damaged by water immersion.

In this embodiment, the water level detecting device 300 further includes a protection structure provided for the water pressure probe 311. Specifically, a protective cover 340 covering the water pressure probe 311 is attached to the inner side of the inner cylinder 200, and a detection hole 341 is formed in the protective cover 340 to communicate the water pressure probe 311 with the inside of the inner cylinder 200.

Through the setting of safety cover 340, prevented that the clothing from rolling and beating the in-process and pounding on water pressure probe 311, can protect water pressure probe 311 to be difficult to damage.

Further, the inner wall of the inner cylinder 200 is protruded from the outer circumference of the detection hole 341, that is, the inner side surface of the inner cylinder front flange 201 forms a cylindrical portion 342, the hydraulic probe 311 is partially inserted into the cylindrical portion 342, and the detection end of the hydraulic probe 311 (that is, the upper end of the hydraulic probe 311 in fig. 4) does not protrude from the surface of the protection cover 340 facing away from the inner cylinder front flange 201.

In the above-mentioned scheme, the cylindrical portion 342 on the protecting cover 340 completely surrounds the detection end of the water pressure probe 311, and the water in the inner cylinder 200 can contact with the water pressure probe 311 through the detection hole 341 and the cylindrical portion 342, so as to realize the detection of the water pressure in the cylinder by the water pressure probe 311. But the clothes in the drum can only cover the surface of the protective cover 340, and no impact or scratch is generated on the water pressure probe 311.

In this embodiment, the outer protective case 320 is integrally connected to the inner protective cover 340 by a connector passing through the inner cylinder front flange 201, thereby achieving the installation of the water level detection device 300.

Specifically, the protection box 320 is provided with a mounting hole 325, the inner barrel front flange 201 is provided with a third through hole 203 corresponding to the mounting hole 325, and the protection cover 340 is provided with a connecting portion corresponding to the mounting hole 325. The water level detecting device 300 is installed by connecting the connection part by passing the installation hole 325 and the third through hole 203 sequentially from the outside of the shield case 320 through the connection part.

In detail, mounting holes 325 with stepped inner walls are respectively provided at positions near both ends of the protection case 320, the connecting members are screws, and the connecting portions of the protection case 340 are screw posts 343. The screw post 343 is inserted into the third through hole 203 on the inner barrel front flange 201, the screw is inserted from the mounting hole 325 on the protection box 320, one end of the screw is abutted against the inner wall of the stepped structure of the mounting hole 325, and the other end is screwed into the screw post 343.

With the above structure, it is not necessary to fix the protection case 320 and the protection cover 340 on the inner tub front flange 201, respectively, and the installation operation of the water level detection device 300 is simplified.

In a further aspect of this embodiment, a sealing member is disposed between the protective cover 340 and the inner barrel front flange 201, for preventing water leakage at the mounting opening 202 and the third through hole 203 on the inner barrel front flange 201.

Specifically, the sealing member is a sealing gasket 350, the sealing gasket 350 has a sealing surface facing the inner barrel front flange 201, the outer circumference of the sealing surface protrudes towards the inner barrel front flange 201 to form a sealing part 352, and the sealing part 352 is in sealing fit with the inner side surface of the inner barrel front flange 201, so that water of the inner barrel 200 cannot permeate between the sealing gasket 350 and the inner barrel front flange 201. The mounting port 202 and the third through hole 203 are both located inside the area surrounded by the sealing portion 352 on the inner tube front flange 201, so that water in the inner tube 200 can be prevented from leaking out through the mounting port 202 and the third through hole 203.

Because the water pressure probe 311 needs to be in contact with the water in the inner cylinder 200, a sealing hole 351 is formed in the sealing pad 350 at a position corresponding to the mounting port 202 on the inner cylinder front flange 201. The water pressure probe 311 is penetrated 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 no water seepage occurs between the sealing hole 351 and the water pressure probe 311, and no water seeps between the sealing gasket 350 and the inner barrel front flange 201 through the sealing hole 351.

Further, a fourth through hole 353 for the screw post 343 to pass through is provided in the sealing gasket 350. In order to avoid 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, and thus to cause water leakage at the mounting port 202 or the third through hole 203, a seal is required between the protection cover 340 and the sealing gasket 350 at least around the region of the fourth through hole 353.

In the embodiment, the gasket 350 is sealed to the protective cover 340 along the outer periphery thereof on the surface of the protective cover 340, and the end surface of the cylindrical portion 342 on the protective cover 340 is sealed to the gasket 350.

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

In a further aspect of the present embodiment, the wireless power supply device 400 mounted on the outer tub 100 includes an encapsulation case, and a wireless power supply element 410 disposed inside the encapsulation case, the wireless power supply element 410 being configured to generate a changeable magnetic field to supply power to the water level detection element 310.

The package housing specifically includes a package box 420 and a package cover 430, which are fastened to package the wireless power supply element 410 inside, so as to protect the wireless power supply element 410. Even if the drum washing machine has a water leakage fault, the wireless power supply element 410 is not contacted with the washing water due to being packaged, so that the drum washing machine is safer and more reliable.

In a further aspect of this embodiment, the water level detection module further includes a signal feedback device, where 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.

In the above-mentioned scheme, the signal transmitting element is electrically connected with the water level detecting element 310, so that the detection result of the water level detecting element 310 on the water level in the inner cylinder 200 can be obtained, and then transmitted to the signal receiving element by means of wireless communication. The signal transmitting element is connected with the water level detecting element 310 in a wired manner to obtain a water level detecting result, and needs to be arranged on the inner barrel 200 in a communication manner with the water level detecting element 310. The signal receiving element is electrically connected with a 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 wireless communication connection between the signal transmitting element and the signal receiving element, saves the arrangement of connecting cables, and avoids the problem of complex wiring structure in the drum washing machine.

In a preferred embodiment of this embodiment, the signal transmitting element is located outside the inner cylinder 200 and is integrally disposed with the water level detecting element 310, and the signal transmitting element is also disposed inside the protective housing formed by the protective case 320 and the protective cover 330. Similarly, the signal receiving element is integrally disposed with the wireless power supply element 410 and is packaged together inside the package case formed by the package case 420 and the package cover 430.

In the above scheme, the signal transmitting element and the water level detecting element 310, and the signal receiving element and the wireless power supply element 410 are integrally provided, respectively, so that the overall structure of the water level detecting module is simplified, and thus, the assembly process of the drum washing machine can be simplified. The signal transmitting element is integrated with the water level detecting element 310, and power is supplied to both the water level detecting element 310 and the signal transmitting element by the wireless power supply element 410. When the signal transmitting element and the water level detecting element 310 rotate along with the inner cylinder 200 to the coverage area of the magnetic field generated by the wireless power supply element 410, that is, to a position close to the lowest position, the wireless power supply element 410 can supply power to the signal transmitting element and the water level detecting element 310, the water level detecting element 310 detects the water level in the inner cylinder 200, and the detection result is transmitted to the signal receiving element through the signal transmitting element, so that the control system can acquire the water level in the inner cylinder 200.

In this embodiment, the water level detecting 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, so as to eliminate the influence of the ambient air pressure change on the water level detection result and improve the accuracy of the detection of the water level height in the inner cylinder 200 by the drum washing machine.

The inner side of the inner cylinder 200 is provided with the protective cover 340 for protecting the water pressure probe 311, and the outer side of the inner cylinder 200 is provided with the protective shell formed by the protective box 320 and the protective cover 330 for protecting the air pressure probe 312, so that the water pressure probe 311 and the air pressure probe 312 are not easily damaged, and the accuracy of the water level detection result is ensured. The portion of the water level detecting element 310 located outside the inner cylinder 200 is integrally located inside the protective housing, and it is also ensured that each electronic component is not soaked in water when the inner cylinder 200 drains water to the outer cylinder 100, and the electronic components are prevented from being soaked and damaged by water.

The foregoing description is only illustrative of the preferred embodiment of the present invention, and is not to be construed as limiting the invention, but is to be construed as limiting the invention to any and all simple modifications, equivalent variations and adaptations of the embodiments described above, which are within the scope of the invention, may be made by those skilled in the art without departing from the scope of the invention.

Claims

1. A drum washing machine comprising an inner tub for independently holding water while washing laundry, and a water level detection module including a water level detection element mounted on the inner tub, characterized in that the water level detection element has:

2. The drum washing machine as claimed in claim 1, wherein a protective housing is installed at an outer side of the inner tub, and a portion of the water level detecting element located at the outer side of the inner tub is disposed inside the protective housing; the protection shell is provided with a first through hole communicated with the inner side and the outer side of the protection shell, and the air pressure detection part is communicated with the external environment through the first through hole.

3. The drum washing machine as claimed in claim 2, wherein the protective housing includes:

4. A drum washing machine as claimed in claim 3, wherein the outer circumference of the first through hole extends from the inner wall of the protective case to the inside of the protective case by a certain length to form a sleeve part, and the air pressure detecting part is an air pressure probe inserted into the sleeve part.

5. The drum type washing machine as claimed in claim 4, wherein the inner wall of the sleeve portion is protruded toward the inside of the sleeve portion at a position near the extended end of the sleeve portion to form an annular boss, and the air pressure probe is sleeved with a gasket, and the gasket is abutted with the surface of the annular boss toward the inside of the protective case.

6. The drum type washing machine as claimed in any one of claims 1 to 5, wherein the inner tub is provided with a mounting port, and the water pressure detecting part is a water pressure probe penetrating through the mounting port and extending into the inner tub; the inner side of the inner cylinder is provided with a protective cover for covering the water pressure probe, and the protective cover is provided with a detection hole for communicating the water pressure probe with the inner cylinder.

7. The drum washing machine as claimed in claim 6, wherein the outer circumference of the sensing hole is protruded to the inner wall of the inner drum to form a cylindrical part, the water pressure probe is partially inserted into the cylindrical part, and the sensing end of the water pressure probe is not protruded to the surface of the protective cover facing away from the inner wall of the inner drum.

8. The drum washing machine as claimed in claim 6, wherein a protective case is installed at an outer side of the inner tub, and a portion of the water level detecting element located at the outer side of the inner tub is disposed inside the protective case;

9. The drum type washing machine as claimed in claim 8, wherein a sealing member is provided between the protective cover and the inner wall of the inner tub, the sealing member having a sealing surface facing the inner wall of the inner tub, and an outer peripheral region of the sealing surface is in sealing engagement with the inner wall of the inner tub; the mounting port and the third through hole are positioned in an area surrounded by the periphery of the sealing surface;

10. The drum washing machine as claimed in any one of claims 1 to 5, further comprising an outer tub, the inner tub being provided inside the outer tub; the water level detection module further comprises a wireless power supply device, and the wireless power supply device comprises: