阅读说明：本技术 一种滚筒洗衣机及控制方法 (Roller washing machine and control method ) 是由 郝兴慧 吴迪 吕艳芬 金学峰 许升 李以民 于 2020-03-25 设计创作，主要内容包括：本发明公开了一种滚筒洗衣机及控制方法,所述滚筒洗衣机包括：滚筒,可独立盛放洗涤水；无线水位检测装置,设置在滚筒内检测滚筒内洗涤水的水位。本发明提供的滚筒洗衣机,通过无线水位传感技术解决了无孔内筒的滚筒洗衣机水位检测困难的问题,不仅测量精准,且易于实现,适用推广性更高。在进水的过程中,通过控制滚筒转动,保证所述无线水位检测装置处于滚筒的最底部,使得所述无线水位检测装置的测量结果更为精准,解决了现有的滚筒洗衣机洗涤水水位检测程序复杂、不精准的问题。(The invention discloses a drum washing machine and a control method, wherein the drum washing machine comprises: a drum which can independently contain washing water; and a wireless water level detection device arranged in the roller for detecting the water level of the washing water in the roller. The drum washing machine provided by the invention solves the problem of difficulty in detecting the water level of the drum washing machine with the non-porous inner drum by a wireless water level sensing technology, is accurate in measurement, easy to realize and higher in applicability and popularization. In the water inlet process, the wireless water level detection device is ensured to be positioned at the bottommost part of the roller by controlling the roller to rotate, so that the measurement result of the wireless water level detection device is more accurate, and the problems that the existing roller washing machine washing water level detection program is complex and inaccurate are solved.)

1. A drum washing machine is characterized in that: the method comprises the following steps:

a drum which can independently contain washing water;

and a wireless water level detection device arranged in the roller for detecting the water level of the washing water in the roller.

2. The washing machine as claimed in claim 1, wherein:

the wireless water level detection device is arranged on the inner wall of the roller; preferably, a lifting rib is arranged in the roller, and the wireless water level detection device is arranged in the lifting rib.

3. A drum washing machine according to claim 2, characterized in that:

the peripheral side wall part of the roller is outwards sunken to form an accommodating groove, and the wireless water level detection device is fixedly arranged in the accommodating groove;

preferably, the wireless water level detection device is arranged in the accommodating groove in a clamping and/or screw and/or bonding mode;

more preferably, the circumferential side wall of the drum has a lifter installation area for installing the lifter, and the accommodating groove is formed by outwardly recessing the circumferential side wall portion of the drum where the lifter installation area is located.

4. A drum washing machine according to claim 3, characterized in that:

the wireless water level detection device comprises a water level detection module, the water level detection module is provided with a detection end facing the washing water in the roller and a reference end communicated with the external atmospheric pressure, and the accommodating groove is provided with an atmospheric pressure communication hole communicated with the reference end and the external atmospheric pressure of the roller.

5. A drum washing machine according to claim 4, characterized in that:

the wireless water level detection device is provided with a shell with a hollow cavity, the water level detection module is located in the shell, the shell is provided with a detection communicating opening and a reference communicating opening, the detection end of the water level detection module penetrates through the detection communicating opening and extends into the roller, and the reference end is communicated with the air pressure communicating hole in the accommodating groove through the reference communicating opening.

6. A drum washing machine according to claim 5, characterized in that:

a sealing structure is arranged between the shell and the inner wall of the accommodating groove;

preferably, the sealing structure is a gasket disposed between the bottom surface of the housing and/or the side surface of the housing and the inner wall of the accommodating groove.

7. A drum washing machine according to claim 5, characterized in that:

the wireless water level detection device also comprises a wireless receiving module and a wireless sending module which are positioned in the shell, the wireless receiving module receives a detection instruction of the control unit of the washing machine and controls the water level detection module to detect the water level of the washing water in the drum, and the wireless sending module sends the water level information detected by the water level detection module to the control unit of the washing machine.

8. A drum washing machine according to claim 1, characterized in that:

the outer cylinder and the roller are respectively composed of a cylindrical outer cylinder peripheral side wall and a cylindrical roller peripheral side wall;

the same one side of urceolus and cylinder corresponds the end and is provided with the opening of seting up relatively in order to form cylinder nozzle and urceolus nozzle respectively, and the opposite side corresponds the end and all seals up and sets up in order to form at the bottom of the cylinder and the urceolus respectively, and during the washing, the inside washing water that can independently hold of cylinder.

9. A control method of a drum washing machine having any one of the above claims 1-8, characterized in that:

in the water inlet stage of the washing program/rinsing program, the wireless water level detection device detects the water level in the drum and feeds water level information back to the control unit of the washing machine, and the control unit controls the opening and closing conditions of a water inlet system of the washing machine according to the water level information.

10. The control method of a drum washing machine according to claim 9, characterized in that: taking the central axis of the roller as a horizontal line:

after each washing program/rinsing program is finished, controlling the rotary drum to rotate, rotating the wireless water level detection device to the bottommost part of the peripheral side wall of the rotary drum, locking the rotary drum at the same time, and directly starting the wireless water level detection device to detect the water level when water is fed next time;

or before the washing machine enters a water inlet stage, the wireless water level detection device is rotated to the bottommost part of the peripheral side wall of the drum, the drum is locked, the water inlet system is controlled to feed water, and meanwhile, the wireless water level detection device is started to carry out water level detection.

Technical Field

The invention relates to the technical field of laundry equipment, in particular to a drum washing machine and a control method.

Background

In the existing drum washing machine, as shown in fig. 1, a gas chamber 100 is configured for water level detection, the gas chamber 100 is communicated with an outer tub 2 of the washing machine, pressure generated by the level of water in the outer tub 2 is transmitted to the gas chamber 100, pressure in the gas chamber 100 is transmitted to a water level sensor 300 through a pressure pipe 200, and the water level sensor 300 is connected with a control board through a wire to transmit signals. In the process of using the washing machine, more and more users find that the household full-automatic washing machine is generally formed by sleeving an inner cylinder and an outer cylinder, because water flow frequently enters and exits between the inner cylinder and the outer cylinder, after the washing machine is continuously used, an area between the side walls of the inner cylinder and the outer cylinder also forms a space for storing dirt and dirt, and scale in tap water, free matters of washing powder, cellulose of clothes, organic matters of a human body and dust and bacteria brought by the clothes are easily remained between the side walls of the inner cylinder and the outer cylinder, and a layer of black and sticky dirty stains and dirt can be accumulated on an interlayer between the inner cylinder and the outer cylinder to form a hotbed for breeding germs.

In order to solve the above problems, it is required to structurally eliminate the secondary contamination of the laundry by the contaminants between the inner and outer drums, which requires the development of a non-porous inner drum washing machine,

the invention patent of application number 201510776031.0 discloses a water level detection structure of a water-free washing machine between barrels and the washing machine: the upper portion of interior bucket is close to the edge and is equipped with a plurality of holes of getting rid of, and the bottom of interior bucket is equipped with at least one interior bucket outlet, and outer bucket bottom is equipped with the telescopic drain valve that can shutoff interior bucket outlet, sets up the air chamber on the outer bucket, sets up pressure sensor on the air chamber, and the air chamber passes through telescopic drain valve and interior bucket intercommunication, the air chamber is equipped with the air chamber outlet that can discharge the water in the air chamber. The washing machine disclosed in the application avoids the problem that dirt is attached to the inner wall of the outer barrel although the water flow is prevented from staying between the inner barrels. However, the washing machine disclosed in the application needs the drain valve to accurately correspond to the connection position of the water outlet, and after the washing machine is used for a long time, due to the fact that the positioning error is possibly caused by reasons such as abrasion and the like, the water level detection cannot be carried out, and therefore the accurate monitoring of the water level of the non-porous drum washing machine cannot be well realized by the existing water level detection scheme.

In view of the above, the present invention is particularly proposed.

Disclosure of Invention

The technical problem to be solved by the invention is to overcome the defects of the prior art, and provide the drum washing machine, which solves the water level detection problem of the drum washing machine with the non-porous inner drum through a wireless water level sensing technology, and has the advantages of accurate measurement, easy realization and higher applicability and popularization.

In order to achieve the purpose, according to one aspect of the invention, the following technical scheme is adopted:

a drum washing machine comprising:

a drum which can independently contain washing water;

and a wireless water level detection device arranged in the roller for detecting the water level of the washing water in the roller.

Further, the wireless water level detection device is arranged on the inner wall of the roller; preferably, a lifting rib is arranged in the roller, and the wireless water level detection device is arranged in the lifting rib.

Furthermore, the peripheral side wall part of the roller is outwards sunken to form an accommodating groove, and the wireless water level detection device is fixedly arranged in the accommodating groove;

preferably, the wireless water level detection device is arranged in the accommodating groove in a clamping and/or screw and/or bonding mode;

more preferably, the circumferential side wall of the drum has a lifter installation area for installing the lifter, and the accommodating groove is formed by outwardly recessing the circumferential side wall portion of the drum where the lifter installation area is located.

Furthermore, the wireless water level detection device comprises a water level detection module, the water level detection module is provided with a detection end facing the washing water in the roller and a reference end communicated with the external atmospheric pressure, and the accommodating groove is provided with an atmospheric pressure communication hole communicated with the reference end and the external atmospheric pressure of the roller.

Furthermore, the wireless water level detection device is provided with a shell with a hollow cavity, the water level detection module is located in the shell, the shell is provided with a detection communicating opening and a reference communicating opening, the detection end of the water level detection module penetrates through the detection communicating opening and extends into the roller, and the reference end is communicated with the air pressure communicating hole in the accommodating groove through the reference communicating opening.

Further, a sealing structure is arranged between the shell and the inner wall of the accommodating groove;

preferably, the sealing structure is a gasket disposed between the bottom surface of the housing and/or the side surface of the housing and the inner wall of the accommodating groove.

Furthermore, the wireless water level detection device also comprises a wireless receiving module and a wireless transmitting module which are positioned in the shell, wherein the wireless receiving module receives a detection instruction of a control unit of the washing machine and controls the water level detection module to detect the water level of the washing water in the drum, and the wireless transmitting module transmits the water level information detected by the water level detection module to the control unit of the washing machine.

The outer cylinder and the roller are respectively composed of a cylindrical outer cylinder peripheral side wall and a cylindrical roller peripheral side wall;

the same one side of urceolus and cylinder corresponds the end and is provided with the opening of seting up relatively in order to form cylinder nozzle and urceolus nozzle respectively, and the opposite side corresponds the end and all seals up and sets up in order to form at the bottom of the cylinder and the urceolus respectively, and during the washing, the inside washing water that can independently hold of cylinder.

The wireless water level detection device detects the water level in the drum and feeds back the water level information to the control unit of the washing machine in the water inlet stage of the washing program/rinsing program, and the control unit controls the opening and closing conditions of the water inlet system of the washing machine according to the water level information.

Further, taking the central axis of the drum as a horizontal line:

after each washing program/rinsing program is finished, controlling the rotary drum to rotate, rotating the wireless water level detection device to the bottommost part of the peripheral side wall of the rotary drum, locking the rotary drum at the same time, and directly starting the wireless water level detection device to detect the water level when water is fed next time;

or before the washing machine enters a water inlet stage, the wireless water level detection device is rotated to the bottommost part of the peripheral side wall of the drum, the drum is locked, the water inlet system is controlled to feed water, and meanwhile, the wireless water level detection device is started to carry out water level detection.

After adopting the technical scheme, compared with the prior art, the invention has the following beneficial effects:

1. the drum washing machine provided by the invention solves the problem of difficulty in water level detection of the drum washing machine with the non-porous inner drum through a wireless water level sensing technology, is accurate in measurement, easy to realize and higher in applicability and popularization. The adopted wireless water level detection device is small in size, good in linearity, capable of accurately measuring the water level in the roller, capable of transmitting through wireless signals, and low in power consumption due to the fact that the wireless water level detection device is provided with a power supply or wirelessly powered.

2. According to the drum washing machine provided by the invention, the wireless water level detection device is arranged in the lifting rib of the drum washing machine, the problem that the water level detection device of the drum washing machine is difficult to install is effectively solved while the detection effect is not influenced, and the wireless water level detection device is hidden in the lifting rib, so that the arranged wireless water level detection device cannot be seen from the appearance, the integral attractiveness is improved, the space inside the drum is not occupied, the space utilization rate in the drum is improved, and the use experience of a user is improved.

3. According to the drum washing machine provided by the invention, the drum wall of the drum is partially outwards sunken to form the accommodating groove for installing the wireless water level detection device, and the profiling structure formed by stamping on the drum wall is used as the accommodating groove for installing the wireless water level detection device, so that the drum washing machine is simple in forming process, simple and convenient to install and higher in stability. Through with wireless water level detection device arranges the storage tank in through joint and/or screw and/or the mode of bonding for wireless water level detection device dismantles to change and installs fixed convenient and fast. This application still is provided with seal structure between wireless water level detection device and storage tank to the leakproofness of wash water in the assurance cylinder avoids a section of thick bamboo interior wash water to leak outward.

4. According to the control method of the drum washing machine, the wireless water level detection device is rotated to the bottommost part of the peripheral side wall of the drum by controlling the rotation of the drum, then the wireless water level detection device is started to start water level detection, and the wireless water level detection device is ensured to be always positioned at the bottommost part of the drum in the water inlet process, so that the measurement result of the wireless water level detection device is more accurate, and the problems that the existing drum washing machine is complex in washing water level detection program, inaccurate and the like are solved.

Drawings

FIG. 1 is a schematic view of a prior art washing machine;

FIG. 2 is a schematic view of the structure of the washing machine according to the present invention;

FIG. 3 is an enlarged view taken at A of FIG. 2 of the present invention;

wherein: 1. a drum; 101. a peripheral side wall of the drum; 1011. a containing groove; 10111. a pneumatic communication hole; 102. a drum bottom; 2. an outer cylinder 201, an outer cylinder peripheral side wall; 202. an outer cylinder bottom; 3. a drum door; 4. an outer cylinder door; 5. decorating the door; 6. a sealing structure; 7. a wireless water level detection device; 8. a housing; 9. lifting the ribs;

100. an air chamber; 200. an air duct; 300. water level sensor

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and the following embodiments are used for illustrating the present invention and are not intended 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", "rear", "left", "right", "vertical", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular 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 otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The present invention will be described in further detail with reference to examples.

As shown in fig. 2 and 3, the embodiment of the present invention provides a laundry treating apparatus, which includes a drum 1 for accommodating laundry while drying the laundry and independently accommodating washing water while washing the laundry, thereby preventing the washing water from being contaminated by dirt and bacteria accumulated outside the drum due to the cross flow of the washing water inside and outside the drum 1 during the washing process of the washing machine

Specifically, the application provides a drum washing machine, including shell 8, be equipped with urceolus 2 in the shell 8, urceolus 2 is connected with washing machine shell 8 through shock attenuation hanger spring and shock attenuation bracing piece respectively from top to bottom to realize that urceolus 2 can shake can install the purpose in washing machine casing 1. A roller 1 which is coaxially arranged is sleeved in the outer cylinder 2; the outer cylinder 2 and the roller 1 are respectively composed of a cylindrical outer cylinder peripheral side wall 201 and a cylindrical roller peripheral side wall 101, the corresponding ends of the same side of the outer cylinder 2 and the same side of the roller 1 are provided with openings which are oppositely arranged so as to respectively form a roller cylinder opening and an outer cylinder opening, and the corresponding ends of the other side are hermetically arranged so as to respectively form a roller cylinder bottom 102 and an outer cylinder bottom 202. Meanwhile, the front end of the washing machine shell 1 is provided with a decorative door 5 which can be opened outwards, and the position of the opening of the outer cylinder is provided with an outer cylinder door 4 which can be opened outwards, so that the opening of the outer cylinder can be correspondingly opened or closed by opening and closing the outer cylinder door 4; and a roller door 1 which can be opened outwards is arranged on the roller 1, so that the opening or the closing of the roller opening can be correspondingly realized by opening or closing the roller door 1. Thus, the effect of installing the drum 1, which can relatively rotate around the shaft and forms a closed water container during washing, in the outer tub 2 is achieved.

As shown in fig. 2, the present invention provides a drum washing machine, comprising: a drum 1 which can independently contain washing water; and a wireless water level detection device 7 disposed in the drum 1 for detecting the water level of the washing water in the drum 1. The problem of detecting the water level of the drum washing machine with the non-porous inner barrel is solved through a wireless water level sensing technology, the measurement is accurate, the implementation is easy, and the applicability and the popularization are higher.

Further, the wireless water level detection device 7 is arranged on the inner wall of the roller 1; preferably, a lifting rib 9 is arranged in the roller 1, a certain cavity structure is arranged inside the lifting rib 9, and the wireless water level detection device 7 is arranged in the cavity of the lifting rib 9. The wireless water level detection device is arranged in the lifting rib of the drum washing machine, the problem that the water level detection device of the drum washing machine is difficult to install is effectively solved while the detection effect is not influenced, the wireless water level detection device is hidden in the lifting rib, the arranged wireless water level detection device cannot be seen from the appearance, the integral attractiveness is improved, the space inside the drum is not occupied, the space utilization rate in the drum is improved, and the use experience of a user is improved.

Furthermore, the peripheral sidewall 101 of the roller 1 is partially recessed outward to form a receiving groove 1011, the receiving groove 1011 is formed by punching the peripheral sidewall 101 of the roller 1 outward from the roller 1, and the wireless water level detecting device 7 is fixedly disposed in the receiving groove 1011. The size of the space inside the containing groove 1011 is not smaller than the size of the wireless water level detection device 7, and preferably, the shape and size of the containing groove 1011 are matched with the shape and size of the wireless water level detection device 7, so that the waste of unnecessary space resources is effectively avoided, and the washing capacity of the roller is improved. The local outside sunken mountable that forms of section of thick bamboo wall of cylinder 1 wireless water level detection device 7's storage tank 1011, the die mould structure that forms through the punching press on the section of thick bamboo wall is as the installation wireless water level detection device's storage tank 1011, and not only molding process is simple, and installs simple and conveniently, and the steadiness is higher, can solve the inconvenient problem of current drum type washing machine water level detection device installation through simple die mould structure.

Preferably, wireless water level detection device 7 is arranged in storage tank 1011 through joint and/or screw and/or the mode that bonds, wireless water level detection device 7 is arranged in storage tank 1011 through the detachable mode, and is concrete, wireless water level detection device 7 is arranged in storage tank 1011 through joint or screw connection's mode. More preferably, the wireless water level detecting device 7 is assembled and connected with the containing groove 1011 in a clamping manner, specifically, the wireless water level detecting device 7 is provided with a clamping part, the inner wall of the containing groove 1011 is provided with a matching part corresponding to the clamping part and matched with the clamping part, the clamping part can be a clamping jaw, the matching part can be a clamping groove, the clamping and matching of the clamping claws and the clamping grooves realize the stable matching of the wireless water level detection device 7 and the containing groove 1011, it dismantles changes convenient and fast, through inciting somebody to action wireless water level detection device 7 does not need to set up supplementary adapting unit alone in arranging storage tank 1011 through joint complex erection joint mode in, realizes the installation with the help of wireless water level detection device 7 and storage tank 1011's self structure, simplifies the structure, and the assembly is firm for wireless water level detection device 7 dismantles to change and installs fixed convenient and fast.

Preferably, the circumferential sidewall 101 of the drum 1 has a lifting rib installation area for installing the lifting rib 9, the bottom surface of the lifting rib 9 is covered and installed on the inner wall of the circumferential sidewall 101 of a part of the drum 1, the circumferential sidewall 101 of the drum 1 covered by the bottom surface of the lifting rib 9 forms the lifting rib installation area, and the storage groove 1011 is formed by the outward concave part of the circumferential sidewall 101 of the drum 1 where the lifting rib installation area is located. Will storage tank 1011 sets up on 1 week lateral wall 101 of cylinder that promotes muscle installing zone, has not only solved effectively water level detection device installation problem hides wireless water level detection device in promoting the muscle simultaneously again, can not see the wireless water level detection device that sets up in the outward appearance, has improved holistic aesthetic property, does not occupy the inside space of cylinder moreover, improves cylinder inner space utilization, promotes user experience.

Further, the wireless water level detecting device 7 includes a water level detecting module having a detecting end facing the washing water inside the drum 1 and a reference end communicating with the external atmospheric pressure. The detection end senses the pressure change of the washing water in the roller 1, the water level height in the roller 1 is determined through the change of the pressure value detected by the detection end, the accommodating groove 1011 is provided with an air pressure communication hole 10111 for communicating the reference end with the external atmospheric pressure of the roller 1, and the air pressure communication hole 10111 is formed in the peripheral side wall 101 of the roller 1, so that the reference end of the water level detection module is communicated with the cavity between the roller 1 and the outer barrel 2 and further communicated with the external atmospheric pressure. The water level detection module detects the water level of the washing water in the roller 1 by sensing the pressure difference between the pressure of the washing water in the roller 1 and the external atmospheric pressure, and feeds back the detected water level information to the control unit of the washing machine through the wireless communication module, wherein the wireless communication module carries out wireless communication in a wlan or Bluetooth or other wireless communication modes.

In the present application, the water level detection module uses an MEMS chip as a pressure sensor to detect the water level of the washing water in the drum, and the current MEMS pressure sensors include a MEMS silicon piezoresistive pressure sensor and a MEMS silicon capacitive pressure sensor, both of which are micro-mechanical electronic sensors formed on a silicon wafer. The MEMS silicon piezoresistive pressure sensor adopts a high-precision semiconductor resistance strain gauge to form a Wheatstone bridge as a force-electricity conversion measuring circuit, and has high measuring precision, low power consumption and extremely low cost. The output of the piezoresistive sensor of the Wheatstone bridge is zero and almost no power is consumed if no pressure changes. The MEMS silicon piezoresistive pressure sensor adopts the inner wall of a circular stress cup silicon film with fixed periphery, four high-precision semiconductor strain gauges are directly carved at the position with maximum stress on the surface of the silicon film by adopting the MEMS technology to form a Wheatstone measuring bridge which is used as a force-electricity conversion measuring circuit to directly convert the physical quantity of pressure into electric quantity, and the measuring precision can reach 0.01-0.03% FS. The MEMS silicon capacitive pressure sensor utilizes the MEMS technology to manufacture a transverse barrier shape on a silicon chip, an upper transverse barrier and a lower transverse barrier form a group of capacitive pressure sensors, the upper transverse barrier is displaced downwards under the action of pressure, the distance between the upper transverse barrier and the lower transverse barrier is changed, and the capacitance between the plates is also changed, namely delta pressure is equal to delta capacitance. The MEMS pressure sensor that this application adopted is not only small, and the linearity is good, can accurate measurement cylinder internal water level, and can carry out wireless output with wireless communication's such as wlan or bluetooth with the signal that obtains, wireless connection between water level detection module and washing machine's the control unit, the wireless transmission of signal has been realized, need not to consider water level detection module and washing machine's the control unit's the line connection problem, the inconvenient problem of the wired transmission of the signal of the control unit of water level detection module and washing machine has been solved, and it is more convenient to use.

Further, wireless water level detection device 7 has the casing of well plenum chamber, water level detection module is located in the casing, the casing has detection intercommunication mouth and benchmark intercommunication mouth, water level detection module's sense terminal passes detect the intercommunication mouth stretch into in the cylinder 1 with the washing water contact in the cylinder 1, the water pressure change of washing water in the perception section of thick bamboo, detect the intercommunication mouth with sealing connection between water level detection module's the sense terminal to guarantee the inside leakproofness of wireless water level detection device 7 casing, avoid the interior washing water of section of thick bamboo to enter into the casing through detecting the intercommunication mouth, cause destruction to the inside structure of wireless water level detection device 7, influence its normal use.

The detection end faces the inside of the roller 1, the reference end is arranged at the other end departing from the detection end, and the reference end is communicated with the atmospheric pressure outside the roller 1. Specifically, the reference end is communicated with the pneumatic communication hole 10111 on the accommodating groove 1011 through the reference communication opening, and the reference communication opening is communicated with the pneumatic communication hole 10111 through a pipeline. Alternatively, as shown in fig. 3, the reference communication port is provided corresponding to the position of the gas pressure communication hole 10111, and the communication of the reference communication port with the gas pressure communication hole 10111 is directly achieved. Preferably, the reference communication port and the air pressure communication hole 10111 are arranged in a position corresponding to each other and are directly communicated with each other, an auxiliary communication component does not need to be separately arranged, the structure is simplified, and the cost is reduced.

Further, because a certain gap is formed between the housing of the wireless water level detection device 7 and the inner wall of the accommodating groove 1011, the washing water in the roller 1 easily flows out of the roller 1 from the air pressure communicating hole 10111 or enters into the cavity of the housing from the reference communicating hole, in order to avoid the above phenomena, a sealing structure 6 is arranged between the housing of the wireless water level detection device 7 and the inner wall of the accommodating groove 1011, so that the sealing performance of the washing water in the roller is ensured, the washing water in the roller is prevented from leaking out of the air pressure communicating hole 10111, or enters into the housing from the reference communicating hole to damage the internal structure of the wireless water level detection device, and the normal use of the wireless water level detection device is influenced.

Preferably, as shown in fig. 2 and 3, the receiving groove 1011 includes a bottom wall that is recessed outward from the peripheral side wall 101 of the roller 1 and a peripheral wall connected between the bottom wall and the peripheral side wall 101 of the roller 1, the bottom wall and the peripheral wall enclose a receiving groove 1011 having a certain receiving space inside of which one end is open, an opening end of the receiving groove 1011 faces the internal space of the roller 1, the air pressure communicating hole 10111 is opened on the bottom wall of the receiving groove 1011, the sealing structure 6 is disposed between the bottom surface of the housing and/or the side surface of the housing and the internal wall of the receiving groove 1011, the sealing structure 6 is a sealing gasket disposed between the bottom surface of the housing and/or the side surface of the housing and the internal wall of the receiving groove 1011, and the sealing gasket may be of an elastic rubber structure. This application has guaranteed the leakproofness of washing water in the cylinder effectively at the seal structure that sets up between wireless water level detection device and storage tank, avoids a section of thick bamboo washing water to leak outward, perhaps enters into the inside phenomenon of casing and takes place.

Further, the wireless water level detection device 7 further includes a wireless receiving module and a wireless transmitting module, which are located in the housing, the wireless receiving module receives a detection instruction of the control unit of the washing machine and controls the water level detection module to detect the water level of the washing water in the drum 1, and the wireless transmitting module transmits the water level information detected by the water level detection module to the control unit of the washing machine.

Further, the wireless water level detection device 7 is provided with a wireless charging module, and the wireless water level detection device is powered by a power supply or adopts a wireless power supply mode. In this application wireless water level detection device adopts wireless power supply's mode to supply power, has avoided current water level detection device and power supply line to be connected inconvenient problem.

The wireless water level detection device detects the water level in the drum and feeds back the water level information to the control unit of the washing machine, and the control unit controls the on-off condition of the water inlet system of the washing machine according to the water level information. When water inlet system begins to intake, start wireless water level detection device, wireless water level detection device detects the water level in real time or once every interval timing detection to with the water level information feedback that detects to washing machine's the control unit, the storage has preset water level in washing machine's the server, whether the current water level that control unit judged wireless water level detection device feedback reaches preset water level, if judge that the current water level has reached preset water level, then control water inlet system closes, stops intaking.

Further, taking the central axis of the drum as a horizontal line: after each washing program/rinsing program is finished, the roller is controlled to rotate to enable the wireless water level detection device to rotate to the bottommost part of the peripheral side wall of the roller, the roller is locked at the same time, and the wireless water level detection device is directly started to detect the water level when water is fed next time. The bottom wall of the outer barrel is provided with a locking part, when a washing or rinsing program is finished each time, a control unit of the washing machine controls the rotary drum to rotate, the wireless water level detection device is rotated to the bottommost part of the peripheral side wall of the rotary drum, and the locking part is controlled to move to lock and position the rotary drum, so that when the next washing or rinsing program enters a water inlet stage, the wireless water level detection device is directly started.

Or, in another scheme, before the washing machine enters a water inlet stage in each washing program/rinsing program, the wireless water level detection device is firstly rotated to the bottommost part of the peripheral side wall of the drum, the drum is locked through the locking part, then the water inlet system is controlled to feed water, and meanwhile, the wireless water level detection device is started to start water level detection. In the whole water inlet process, the roller is in a locked state, and the wireless water level detection device is ensured to be always positioned at the bottommost part of the roller, so that the measurement accuracy of the wireless water level detection device is ensured.

According to the control method of the drum washing machine, the wireless water level detection device is rotated to the bottommost part of the peripheral side wall of the drum by controlling the rotation of the drum, then the wireless water level detection device is started to start water level detection, and the wireless water level detection device is ensured to be always positioned at the bottommost part of the drum in the water inlet process, so that the measurement result of the wireless water level detection device is more accurate, and the problems that the existing drum washing machine is complex in washing water level detection program and inaccurate are solved.

The embodiments in the above embodiments can be further combined or replaced, and the embodiments are only used for describing the preferred embodiments of the present invention, and do not limit the concept and scope of the present invention, and various changes and modifications made to the technical solution of the present invention by those skilled in the art without departing from the design idea of the present invention belong to the protection scope of the present invention.