CN113981660B - Ultrasonic wave drum washing machine and self-cleaning method thereof - Google Patents
Ultrasonic wave drum washing machine and self-cleaning method thereof Download PDFInfo
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- CN113981660B CN113981660B CN202111354384.3A CN202111354384A CN113981660B CN 113981660 B CN113981660 B CN 113981660B CN 202111354384 A CN202111354384 A CN 202111354384A CN 113981660 B CN113981660 B CN 113981660B
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- 238000004140 cleaning Methods 0.000 title claims abstract description 120
- 238000005406 washing Methods 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 27
- 239000007788 liquid Substances 0.000 claims abstract description 34
- 238000004506 ultrasonic cleaning Methods 0.000 claims abstract description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- 238000010438 heat treatment Methods 0.000 claims abstract description 9
- 239000002131 composite material Substances 0.000 claims description 14
- 230000000694 effects Effects 0.000 abstract description 17
- 238000005202 decontamination Methods 0.000 abstract description 3
- 230000003588 decontaminative effect Effects 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 150000001875 compounds Chemical class 0.000 abstract 1
- 239000000919 ceramic Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000013078 crystal Substances 0.000 description 2
- 239000003599 detergent Substances 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 241001330002 Bambuseae Species 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- 244000052616 bacterial pathogen Species 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012459 cleaning agent Substances 0.000 description 1
- 238000012864 cross contamination Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F39/00—Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Cleaning By Liquid Or Steam (AREA)
Abstract
The invention provides a drum washing machine and a self-cleaning method thereof, wherein the drum washing machine comprises an inner drum and an outer drum which are coaxially arranged, and further comprises an ultrasonic transducer arranged on the end face of the outer drum and a heater arranged between the outer drum and the inner drum in the vertical direction, wherein an emitter of the ultrasonic transducer passes through the projection of the wall of the inner drum along the drum body direction. The self-cleaning method comprises a water inlet step, wherein cleaning liquid enters the outer cylinder of the washing machine, and the liquid level at least exceeds the emitter of the ultrasonic transducer; heating, namely heating the cleaning liquid to 60-80 ℃ and keeping the temperature constant; an ultrasonic cleaning step and a drainage step; the ultrasonic cleaning step includes a low-frequency cleaning and a high-frequency cleaning or a compound cleaning step. The invention realizes the ultrasonic self-cleaning of the drum washing machine through the ultrasonic transducer arranged on the end surface of the outer drum, and has the advantages of environmental protection, convenience, rapidness and good decontamination effect.
Description
Technical Field
The invention relates to the field of clothes cleaning, in particular to an ultrasonic roller washing machine and a self-cleaning method thereof.
Background
Along with the continuous improvement of the living standard of people, the importance of consumers on healthy life is higher and higher, and the washing machine is gradually free from the positioning of pure clothes washing equipment and gradually changes and upgrades to the clothes health care equipment. After the washing machine is used for a long time, a thick layer of dirt is adhered to the outer wall of the metal inner cylinder, and a large amount of germs and mold are bred in a closed and moist environment in the washing machine, so that cross contamination is generated on clothes in the inner cylinder, and various potential hazards are formed to the health of users. Therefore, aiming at the problem of secondary pollution in the washing process of clothes of the washing machine, the daily cleaning of the outer wall of the inner cylinder is very important.
At present, the traditional washing machine inner cylinder cleaning method mainly comprises a manual disassembly cleaning method, an inner cylinder self-rotation rinsing method and an internal high-pressure water flow jet cleaning method, wherein the former cleaning method has good cleaning effect, but is labor-saving and quite uneconomical; the latter two methods, although belonging to self-cleaning technology, do not have ideal cleaning effect and are time-consuming. Therefore, it is necessary to design a high-efficiency self-cleaning method for the inner cylinder of the washing machine without disassembly and assembly.
Disclosure of Invention
The invention provides an ultrasonic roller washing machine and a self-cleaning method thereof in view of the problems that the inner cylinder of the existing washing machine is labor-consuming and time-consuming and the cleaning effect is not ideal.
The technical scheme of the invention is as follows:
the utility model provides a drum type washing machine, includes inner tube and urceolus that coaxial arrangement, and the inner tube can rotate around the central axis drive, still includes, sets up at the ultrasonic transducer of urceolus terminal surface, with the driver that ultrasonic transducer electricity is connected and set up the heater of vertical direction below between urceolus and the inner tube, ultrasonic transducer's projecting transducer passes through the projection of inner tube section of thick bamboo wall along the barrel body direction.
Specifically, ultrasonic transducer is two, along vertical direction symmetry setting down, satisfies around the angle alpha that the central axis formed between two ultrasonic transducer: alpha is more than or equal to 60 degrees and less than or equal to 90 degrees. The heater is arranged in a gap between the inner cylinder and the outer cylinder between the two ultrasonic transducers.
In particular, the ultrasonic transducer can work in two working modes of low frequency and high frequency,
specifically, in the low-frequency working mode, the resonant frequency of the ultrasonic transducer is f r1 =20±1kHz; in a high-frequency working mode, the resonant frequency of the ultrasonic transducer is f r2 ＝60±1kHz。
A self-cleaning method of a drum washing machine, comprising:
a water inlet step, namely opening a water inlet valve of the washing machine to enable cleaning liquid to enter an outer barrel of the washing machine, wherein the liquid level of the cleaning liquid at least exceeds an emitter of an ultrasonic transducer;
and a heating step, namely starting a heater, heating the cleaning liquid to 60-80 ℃, and keeping the temperature constant.
An ultrasonic cleaning step, wherein the occurrence frequency of the driver is controlled to be f d The driving signals of the inner cylinder are transmitted to the ultrasonic transducer, and simultaneously the inner cylinder is controlled to rotate unidirectionally at a low speed, and the driving frequency f is controlled d The method meets the following conditions:
f d ＝(f r +f a )/2；
wherein:
f a the anti-resonant frequency of the ultrasonic transducer in the current operating mode,
f r the resonant frequency of the ultrasonic transducer in the current working mode;
and a water draining step, namely opening a water draining valve of the washing machine, and draining the cleaned dirt along with the cleaning liquid.
Preferably, the ultrasonic cleaning step includes:
a low-frequency cleaning step, namely controlling the ultrasonic transducer to work in a low-frequency working mode to perform low-frequency cleaning;
and a high-frequency cleaning step, wherein the ultrasonic transducer is controlled to work in a high-frequency working mode to perform high-frequency cleaning.
Specifically, the cleaning time of the low-frequency cleaning step and the high-frequency cleaning step is 5min.
Preferably, the ultrasonic cleaning step includes a composite cleaning step, namely, a first ultrasonic transducer of the two ultrasonic transducers is controlled to work in a low-frequency cleaning mode, and a second ultrasonic transducer is controlled to work in a high-frequency working mode, and the cleaning is kept for 10 minutes.
Preferably, the ultrasonic cleaning step includes:
a low-frequency cleaning step, namely controlling the ultrasonic transducer to work in a low-frequency working mode, and performing low-frequency cleaning for 5min;
and a composite cleaning step, namely controlling a first ultrasonic transducer of the two ultrasonic transducers to work in a low-frequency cleaning mode, and controlling a second ultrasonic transducer to work in a high-frequency working mode, and carrying out composite cleaning for 10 minutes.
And a high-frequency cleaning step, wherein the ultrasonic transducer is controlled to work in a high-frequency working mode, and high-frequency cleaning is carried out for 5min.
Specifically, the rotation speed v of the inner cylinder satisfies: v is more than or equal to 0.2rpm and less than or equal to 60rpm, and the draining step keeps the inner cylinder rotating at a low speed.
According to the self-cleaning washing machine inner barrel, the ultrasonic transducer arranged on the end face of the outer barrel emits ultrasonic waves to the cleaning liquid on the side wall of the inner barrel, dirt crystals on the side wall of the inner barrel are impacted by cavitation generated in the cleaning liquid by the ultrasonic waves, and the dirt crystals are peeled off and separated from the side wall of the inner barrel, so that the self-cleaning of the inner barrel of the washing machine is realized. Compared with the prior art, the invention realizes the advantages of green environmental protection, convenience, rapidness and good decontamination effect of the self-cleaning sanitary appliance of the washing machine by using ultrasonic waves.
Drawings
FIG. 1 is a schematic view of an ultrasonic transducer according to the present invention;
FIG. 2 is a schematic side view of a washing machine according to the present invention;
fig. 3 is a front view schematically showing a washing machine according to the present invention.
In the figure:
1, an inner cylinder; 2, an outer cylinder; 3, an ultrasonic transducer; 4 a heater;
11 central axis; 12 bearings; 13, a motor; 14 the inner cylinder wall;
21 an outer cylinder bottom; 22, the wall of the outer cylinder;
31. 311, 312 piezoceramic rings; 32 balancing weights; 33 emitter; 34 rear end cap.
Detailed Description
The present invention will be described in detail below with reference to the drawings and the specific embodiments, and in the present specification, the dimensional proportion of the drawings does not represent the actual dimensional proportion, but only represents the relative positional relationship and connection relationship between the components, and the components with the same names or the same reference numerals represent similar or identical structures, and are limited to the schematic purposes.
The drum washing machine in the invention refers to a drum washing machine with an inner drum center line horizontally arranged, and a Z-axis positive direction of a coordinate system in each drawing represents a vertical upward direction.
The structure of the ultrasonic transducer used in this embodiment is shown in fig. 1, the ultrasonic transducer 3 includes a piezoelectric ceramic ring 31, a counterweight 32, an emitter 33, and a rear end cap 34. The four piezoelectric ceramic rings 311 between the two weights 32 are installed at the node surface of the first-order longitudinal vibration of the transducer to excite the first-order longitudinal vibration mode of the transducer, wherein the first-order longitudinal vibration mode is the low-frequency operation mode of the ultrasonic transducer, and the two piezoelectric ceramic rings 312 between the weights 32 and the emitter 33 and the two piezoelectric ceramic rings 312 between the weights 32 and the rear end cover 34 are installed at the node surface of the second-order longitudinal vibration of the transducer to excite the second-order longitudinal vibration mode of the transducer, wherein the second-order longitudinal vibration mode is the high-frequency operation mode of the ultrasonic transducer.
For the ultrasonic transducer, it is electrically connected with a driver 35 mounted outside the bottom surface of the outer cylinder and having an output frequency f d Is driven by (f) to the ultrasonic transducer d For the optimal driving frequency of the ultrasonic transducer with minimum loss under a given working mode, the optimal driving frequency f d For the resonant frequency f in the corresponding working mode r And antiresonant frequency f a Arithmetic mean of (i), i.e
f d ＝(f a +f r )/2，
And the resonant frequency corresponds to the resonant frequency of the emitter in the working mode, namely the external emission frequency of the emitter in the working mode.
In this embodiment, the resonant frequency of the low-frequency operation mode of the ultrasonic transducer is f r1 =20±1kHz, the resonant frequency of the high-frequency operation mode of the ultrasonic transducer is f r2 ＝60±1kHz。
The horizontal drum washing machine inner drum 1 and the outer drum 2 are shown in a side view schematic diagram of the washing machine in fig. 2, the inner drum and the outer drum are coaxially arranged, the central axis 11 is horizontal, the inner drum is rotatably connected with the drum bottom 21 of the outer drum of the washing machine through a bearing 12, and the motor 13 is used for controlling and driving the inner drum to rotate around the central axis in a controlled manner.
As shown in a front schematic view of the washing machine in fig. 3, two ultrasonic transducers 3 are symmetrically installed on the lower position of the outer cylinder bottom 21 on the vertical surface, the flared end of the horn-shaped emitter 33 points to the direction of the inner cylinder 1, and the projection of the flared end of the emitter along the central axis direction passes through the inner cylinder wall 15, and the angle α between the two ultrasonic transducers 3 around the central axis 11 satisfies: alpha is more than or equal to 60 degrees and less than or equal to 90 degrees. A heater 4 is further arranged between the gap between the inner cylinder wall 14 and the outer cylinder wall 22 clamped by the two ultrasonic transducers, and the heater comprises a heating end for heating the cleaning liquid and a constant temperature device for collecting and controlling the temperature of the cleaning liquid.
The invention also provides a self-cleaning method for the drum washing machine, which comprises the following steps:
and in the water inlet step, a water inlet valve is opened, so that the cleaning liquid flows into the outer cylinder through the water inlet pipe, and the liquid level at least exceeds the emitter of the ultrasonic transducer, so that the ultrasonic energy emitted by the ultrasonic transducer can act on the cleaning liquid, cavitation effect is generated in the cleaning liquid, and dirt on the cylinder wall is impacted. In order to improve the decontamination effect, the cleaning liquid is preferably a mixture of water and a detergent, the detergent can improve the activity of the cleaning liquid and the solubility of soluble dirt in the cleaning liquid, but the cleaning liquid can also be cleaned by using only water, and the water of the cleaning liquid is not particularly required, and the water is usually connected with tap water supplied by municipal administration in actual use.
And in the heating step, a heater is started, and the temperature of the cleaning liquid is kept at a constant temperature within 60-80 ℃ so as to exert the activity of the cleaning agent, and the method is beneficial to reducing the content of dissolved air in the cleaning liquid and improving the clear effect of ultrasound. In this embodiment, the constant temperature is set to 70 ℃.
And in the ultrasonic cleaning step, the inner cylinder is controlled to rotate at a constant speed of 30rpm, and the ultrasonic transducer is started to carry out ultrasonic cleaning, and because the inner cylinder always rotates at a constant speed in the ultrasonic cleaning process, each position on the side wall of the inner cylinder always passes through an ultrasonic action area emitted by the ultrasonic transducer periodically, the wall of the inner cylinder is relatively uniformly cleaned, and the dirt on the wall of the inner cylinder is uniformly and effectively removed.
Specifically, according to the characteristics of the ultrasonic transducer in two working modes of low frequency and high frequency, the ultrasonic cleaning step can be subdivided into three steps of low frequency cleaning, composite cleaning and high frequency cleaning.
In the low frequency cleaning step, both of the ultrasonic transducers are operated in a low frequency cleaning mode. And keep for 5min, i.e. the working frequency of the first ultrasonic transducer and the second ultrasonic transducer are both at the resonant frequency f r Operate at =20±1kHz.
In the composite cleaning step, the first ultrasonic transducer is operated in a low-frequency operation mode, and the resonance frequency f r =20±1kHz; the second ultrasonic transducer works in a high-frequency working mode, and the resonance frequency f r =60±1kHz. Because the inner cylinder rotates at a low speed, each position on the side wall of the inner cylinder alternately passes through the low-frequency ultrasonic cleaning area and the high-frequency ultrasonic cleaning area.
In the high-frequency cleaning step, the two ultrasonic transducers are operated in a high-frequency operation mode, and the resonant frequency f r =60±1kHz, and kept for 5-10 minutes.
In the ultrasonic cleaning process, a large number of fine acoustic cavitation bubbles are generated in the cleaning liquid through cavitation action of ultrasonic waves emitted by an ultrasonic transducer in the cleaning liquid, and dirt on the side wall can be loosened due to impact action of the bubbles when the bubbles are closed, so that the dirt and the cylinder wall are finally peeled off. The dirt with different structures and particle sizes is sensitive to ultrasonic waves with different frequencies, in general, dirt with larger particle sizes is sensitive to low-frequency ultrasonic waves, and dirt with smaller particle sizes is sensitive to high-frequency ultrasonic waves. Therefore, the combination of low-frequency cleaning and high-frequency cleaning can obtain a cleaning effect better than that of single-frequency ultrasonic cleaning, and after the composite cleaning mode is adopted, dirt on the side wall of the inner cylinder alternately passes through the low-frequency cleaning area and the high-frequency cleaning area when the inner cylinder rotates, so that the cleaning effect is further optimized through the alternate effect.
And in the draining step, a draining valve is opened to drain the cleaning liquid containing dirt, and the inner cylinder is preferably kept to rotate during draining, so that the effects of continuously stirring the cleaning liquid and preventing dirt from precipitating are achieved, and solid particles in the dirt are prevented from remaining in the washing machine by accelerating the draining of the cleaning liquid. After the water is drained, water can be repeatedly introduced as required, and clear liquid and dirt residues in the cylinder are rinsed and drained cleanly through the rotation and stirring of the inner cylinder.
It should be noted that, in the ultrasonic cleaning step, the cleaning step is divided into three steps of low-frequency cleaning, composite cleaning and high-frequency cleaning, which are one of the preferred embodiments of the present invention, and the ultrasonic cleaning and descaling effects can be achieved by performing the low-frequency cleaning, the high-frequency cleaning or the composite cleaning independently.
In the invention, the rotating speed of the inner cylinder is set to be 30rpm which is the optimal setting considering the maximization of the cleaning effect, so that the inner cylinder can at least completely rotate for one circle in the ultrasonic cleaning process, and each point on the side wall of the inner cylinder can uniformly pass through an ultrasonic cleaning area to realize ultrasonic cleaning, and the rotating speed of the inner cylinder is at least more than 0.2rpm. In order to ensure that the time for the inner cylinder side wall to pass through the ultrasonic cleaning area reaches the minimum working time of the ultrasonic cleaning effect, the rotating speed of the inner cylinder should be less than 60rpm, so that the cleaning time continuously subjected to ultrasonic cleaning in each period reaches the minimum working time required by effective cleaning for each point on the inner cylinder side wall.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solution of the present invention should fall within the scope of protection defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (9)
1. The drum washing machine comprises an inner drum (1) and an outer drum (2) which are coaxially arranged, wherein the inner drum can rotate around a central axis (11) in a driving way, and is characterized by further comprising,
an ultrasonic transducer (3) arranged on the end face of the outer cylinder, a driver (35) electrically connected with the ultrasonic transducer and a heater (4) arranged between the outer cylinder (2) and the inner cylinder (1) and at the lower part in the vertical direction, wherein an emitter (33) of the ultrasonic transducer (3) passes through the wall (14) of the inner cylinder and projects along the cylinder body direction;
the number of the ultrasonic transducers is two;
the two ultrasonic transducers can execute a composite cleaning step, namely, when in cleaning, a first ultrasonic transducer in the two ultrasonic transducers (3) is controlled to work in a low-frequency cleaning mode, and a second ultrasonic transducer is controlled to work in a high-frequency working mode;
in the composite cleaning step, when the inner cylinder (1) rotates, each position on the side wall of the inner cylinder (1) alternately passes through a low-frequency ultrasonic cleaning area and a high-frequency ultrasonic cleaning area.
2. A drum washing machine as claimed in claim 1, characterized in that the ultrasonic transducers are arranged symmetrically downwards in the vertical direction, the angle α formed between the two ultrasonic transducers about the central axis (11) being such that: the angle alpha is more than or equal to 60 degrees and less than or equal to 90 degrees, and the heater (4) is arranged in a gap between the inner cylinder (1) and the outer cylinder (2) between the two ultrasonic transducers (3).
3. A drum washing machine as claimed in claim 1 or 2, characterized in that the ultrasonic transducer (3) is capable of operating in two modes, a low frequency mode and a high frequency mode, in which the resonant frequency of the ultrasonic transducer is f r1 =20±1kHz; in a high-frequency working mode, the resonant frequency of the ultrasonic transducer is f r2 ＝60±1kHz。
4. A self-cleaning method for a drum washing machine as claimed in any one of claims 1 to 3, comprising:
a water inlet step, namely opening a water inlet valve of the washing machine to enable cleaning liquid to enter an outer barrel (2) of the washing machine, wherein the liquid level of the cleaning liquid at least exceeds the upper end of an emitter (33) of an ultrasonic transducer (3);
a heating step, namely starting a heater (4), heating the cleaning liquid to 60-80 ℃, and keeping the temperature constant;
an ultrasonic cleaning step of controlling the frequency of occurrence of the driver (35) to be f d And transmits the driving signal of the ultrasonic transducer to the ultrasonic transducer(3) Simultaneously controls the inner cylinder (1) to rotate unidirectionally at a low speed, and drives the frequency f d The method meets the following conditions:
f d ＝(f r +f a )/2；
wherein:
f a an anti-resonant frequency of the ultrasonic transducer in the current operating mode;
f r the resonant frequency of the ultrasonic transducer in the current working mode;
a water draining step, namely opening a water draining valve of the washing machine, and draining the cleaned dirt along with the cleaning liquid;
the ultrasonic cleaning step further comprises a composite cleaning step, namely a first ultrasonic transducer in the two ultrasonic transducers (3) is controlled to work in a low-frequency cleaning mode, and a second ultrasonic transducer is controlled to work in a high-frequency working mode;
in the composite cleaning step, when the inner cylinder (1) rotates, each position on the side wall of the inner cylinder (1) alternately passes through a low-frequency ultrasonic cleaning area and a high-frequency ultrasonic cleaning area.
5. The self-cleaning method of a drum washing machine as claimed in claim 4, wherein the ultrasonic cleaning step comprises:
a low-frequency cleaning step, wherein the ultrasonic transducer (3) is controlled to work in a low-frequency working mode to perform low-frequency cleaning;
and a high-frequency cleaning step, wherein the ultrasonic transducer (3) is controlled to work in a high-frequency working mode to perform high-frequency cleaning.
6. The self-cleaning method of drum washing machine as claimed in claim 5, wherein the washing time of the low frequency washing step and the high frequency washing step is 5min.
7. The self-cleaning method of a drum washing machine as claimed in claim 4, wherein the complex cleaning step is maintained for 10 minutes.
8. The self-cleaning method of a drum washing machine as claimed in claim 4, wherein the ultrasonic cleaning step comprises:
a low-frequency cleaning step, wherein the ultrasonic transducer (3) is controlled to work in a low-frequency working mode, and the low-frequency cleaning is carried out for 5min;
a composite cleaning step, namely performing composite cleaning for 10 minutes;
and a high-frequency cleaning step, wherein the ultrasonic transducer (3) is controlled to work in a high-frequency working mode, and high-frequency cleaning is carried out for 5min.
9. A drum washing machine self-cleaning method as claimed in any one of claims 5-8, characterized in that the rotation speed v of the inner drum (1) is such that: v is more than or equal to 0.2rpm and less than or equal to 60rpm, and the inner cylinder is kept to rotate at a low speed in the drainage step.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111354384.3A CN113981660B (en) | 2021-11-16 | 2021-11-16 | Ultrasonic wave drum washing machine and self-cleaning method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111354384.3A CN113981660B (en) | 2021-11-16 | 2021-11-16 | Ultrasonic wave drum washing machine and self-cleaning method thereof |
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| CN113981660A CN113981660A (en) | 2022-01-28 |
| CN113981660B true CN113981660B (en) | 2023-12-22 |
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