CN109281117A - The roller washing machine of non-porous interior bucket - Google Patents
The roller washing machine of non-porous interior bucket Download PDFInfo
- Publication number
- CN109281117A CN109281117A CN201811067956.8A CN201811067956A CN109281117A CN 109281117 A CN109281117 A CN 109281117A CN 201811067956 A CN201811067956 A CN 201811067956A CN 109281117 A CN109281117 A CN 109281117A
- Authority
- CN
- China
- Prior art keywords
- interior bucket
- porous interior
- outer barrel
- porous
- washing machine
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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
- D06F23/00—Washing machines with receptacles, e.g. perforated, having a rotary movement, e.g. oscillatory movement, the receptacle serving both for washing and for centrifugally separating water from the laundry
- D06F23/02—Washing machines with receptacles, e.g. perforated, having a rotary movement, e.g. oscillatory movement, the receptacle serving both for washing and for centrifugally separating water from the laundry and rotating or oscillating about a horizontal axis
- D06F23/025—Washing machines with receptacles, e.g. perforated, having a rotary movement, e.g. oscillatory movement, the receptacle serving both for washing and for centrifugally separating water from the laundry and rotating or oscillating about a horizontal axis with a rotatable imperforate tub
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- 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
- D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
- D06F37/02—Rotary receptacles, e.g. drums
- D06F37/04—Rotary receptacles, e.g. drums adapted for rotation or oscillation about a horizontal or inclined axis
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- 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
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Detail Structures Of Washing Machines And Dryers (AREA)
Abstract
The invention discloses a kind of roller washing machines of non-porous interior bucket, including cabinet and it is located in the box body water inlet system, drainage system, outer barrel, non-porous interior bucket, water level sensor, driver, door body and the control panel in portion, the outside of the door body is equipped with door closure sealing ring, the water level sensor end of probe runs through and extends to the inside of outer barrel, one end at the top of the non-porous interior bucket is equipped with seal assembly, the side of the non-porous interior bucket is equipped with flange shaft, and the non-porous interior bucket is fixedly connected by flange shaft with outer barrel.The present invention passes through being used cooperatively between non-porous interior bucket and seal assembly, it is connected to non-porous inner barrel and outer barrel directly, there is no slurry between inner barrel and outer barrel non-porous in washing process, and in dehydration, slurry is discharged by the seal assembly in non-porous interior bucket, non-porous interior bucket, outer barrel inner wall and flange shaft adherency lint and dirt are effectively prevented, cleaning is facilitated, avoids the case where secondary pollution is caused to clothing.
Description
Technical field
The present invention relates to domestic electric appliance technical field more particularly to a kind of roller washing machines of non-porous interior bucket.
Background technique
Interior bucket used in roller washing machine at present, is covered with many drainage holes thereon, and inner barrel and outer barrel is directly connected to.Washed
In journey between inner barrel and outer barrel be full of slurry, slurry of this part between inner barrel and outer barrel to laundry performance almost
It is not promoted, causes the waste of water resource.Simultaneously as slurry of this part between inner barrel and outer barrel is washed
Contacted with interior bucket outer wall, outer barrel inner wall and flange shaft always in journey, after some cycles, interior bucket outer barrel, outer barrel inner wall with
And flange shaft can adhere to several lint and dirt, and be difficult to clear up, and cause secondary pollution to clothing.
Summary of the invention
The present invention is directed to solve at least some of the technical problems in related technologies.For this purpose, of the invention
One purpose is to propose a kind of roller washing machine of non-porous interior bucket, is connected to inner barrel and outer barrel directly, i.e., in washing process
There is no slurry between middle inner barrel and outer barrel, and in dehydration, slurry is arranged by the interior bucket seal assembly in interior bucket
Out, it is convenient to clean, avoids causing secondary pollution to clothing.
A kind of roller washing machine of non-porous interior bucket according to an embodiment of the present invention, including cabinet and is located in the box body portion
Water inlet system, drainage system, outer barrel, non-porous interior bucket, water level sensor, driver, door body and control panel, the door body it is outer
Side is equipped with door closure sealing ring, and the water level sensor end of probe runs through and extend to the inside of outer barrel, the non-porous interior bucket top
One end be equipped with seal assembly, the side of the non-porous interior bucket is equipped with flange shaft, and the non-porous interior bucket passes through flange shaft and outer barrel
It is fixedly connected.
Preferably, the water inlet system includes inlet valve and circulating pump, and the inlet valve is mounted on the inside of cabinet, and into
Water valve is connect with extraneous tap, and the water outlet of the inlet valve is communicated with water inflowing box, the water inflowing box far from inlet valve one
End is connected to outer barrel, and the circulating pump is located in the box body the bottom of chamber, and the output end of the circulating pump is communicated with spray tube, described
Spray tube is equipped with spray head far from one end of circulating pump.
Preferably, the drainage system includes draining pump, and the draining pump is located in the box body the bottom of chamber, the draining pump
Intake-outlet be communicated with drainpipe, one end of the drainpipe is connected to the bottom of outer barrel, the other end of the drainpipe
Run through and extend to the outside of cabinet.
Preferably, it is provided with heating device, damper in said tub, hangs spring, bearing block and is fixedly mounted on bearing block
Internal bearing, the heating device are fixedly mounted on the rear lower of outer barrel, and the damper is fixedly mounted on the lower part of outer barrel
And be fixedly connected with the bottom of cabinets cavity, the top hung spring and be mounted on outer barrel, the top for hanging spring and cabinet it is interior
Wall is fixedly connected, and the bearing block is fixedly mounted on the outside of outer barrel, and the inner wall of bearing block one end and cabinet far from outer barrel
It is fixedly connected.
Preferably, the seal assembly includes cavity, spring, centrifugation body, sealing element, sealing ring, and the inside cavity is set
There are guide rod A, spacing collar B, be equipped with several apopore C cavity wall week, the sealing element is mounted on centrifugation body, the centrifugation body
It can move back and forth on the guide rod A in portion in the cavity, the spring passes through guide rod A, is mounted in guide rod A and spacing collar B
Between, and as the reciprocating motion of centrifugation body is extruded or is discharged.
Preferably, the non-porous interior bucket is equipped with taper, and section middle section is in isosceles trapezoid, and both ends are cylindrical.
Preferably, the seal assembly is converted between washing state and dewatering state according to the revolving speed of non-porous interior bucket, when
In the state of washing, the seal assembly is in close state the non-porous interior bucket, non-porous interior bucket can be sealed, when described non-porous
For interior bucket in dewatering state, the seal assembly is in the open state, so that the slurry of non-porous interior bucket is discharged to outer barrel.
Beneficial effect in the present invention is: by being used cooperatively between non-porous interior bucket and seal assembly, making non-porous interior bucket
It is not connected to directly with outer barrel, i.e., there is no slurry between inner barrel and outer barrel non-porous in washing process, and in dehydration, pass through
Slurry is discharged seal assembly in non-porous interior bucket, and it is viscous to effectively prevent non-porous interior bucket, outer barrel inner wall and flange shaft
Attached lint and dirt facilitate cleaning, avoid the case where causing secondary pollution to clothing.
Detailed description of the invention
Attached drawing is used to provide further understanding of the present invention, and constitutes part of specification, with reality of the invention
It applies example to be used to explain the present invention together, not be construed as limiting the invention.In the accompanying drawings:
Fig. 1 is a kind of structural schematic diagram of the roller washing machine of non-porous interior bucket proposed by the present invention；
Fig. 2 be Fig. 1 of the present invention along the sectional view of A-A；
Fig. 3 is the schematic diagram of the non-porous interior bucket of the present invention；
Fig. 4 is the non-porous interior bucket of the present invention and interior bucket seal assembly scheme of installation；
Fig. 5 is cross-sectional view of the interior bucket seal assembly of the present invention in washing state；
Fig. 6 is cross-sectional view of the interior bucket seal assembly of the present invention in dewatering state.
In figure: 1 cabinet, 2 water inlet systems, 21 inlet valves, 22 water inflowing boxes, 23 circulating pumps, 24 spray tubes, 25 spray heads, 3 drainings
Spring, 44 bearing blocks, 45 bearings, 5 non-porous is hung in system, 31 draining pumps, 32 drainpipes, 4 outer barrels, 41 heating devices, 42 dampers, 43
Interior bucket, 6 water level sensors, 7 drivers, 8 door body, 9 control panels, 10 door closure sealing rings, 11 seal assemblies, 12 flange shafts.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.
Examples of the embodiments are shown in the accompanying drawings, and in which the same or similar labels are throughly indicated identical or classes
As element or element with the same or similar functions.The embodiments described below with reference to the accompanying drawings are exemplary, purport
It is being used to explain the present invention, and is being not considered as limiting the invention.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" "inner", "outside", " up time
The orientation or positional relationship of the instructions such as needle ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " be orientation based on the figure or
Positional relationship is merely for convenience of description of the present invention and simplification of the description, rather than the device or element of indication or suggestion meaning must
There must be specific orientation, be constructed and operated in a specific orientation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include one or more of the features.In the description of the present invention, the meaning of " plurality " is two or more,
Unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be mechanical connect
It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary
The interaction relationship of the connection in portion or two elements.It for the ordinary skill in the art, can be according to specific feelings
Condition understands the concrete meaning of above-mentioned term in the present invention.
Referring to Fig.1-6, a kind of roller washing machine of non-porous interior bucket, the water inlet system including cabinet 1 and inside cabinet 1
System 2, drainage system 3, outer barrel 4, non-porous interior bucket 5, water level sensor 6, driver 7, door body 8 and control panel 9, driver 7 are logical
The mode crossing belt or directly driving is connect with the flange shaft 12 of non-porous interior bucket 5, and the outside of door body 8 is equipped with door closure sealing ring 10, door
Body 8 is fixed on cabinet, and is cooperated with non-porous interior bucket 5, and by turning on or off for picking and placing clothing for door body 8, water level is passed
6 end of probe of sensor runs through and extends to the inside of outer barrel 4, and water level sensor is connected by hose with outer barrel, for judging washing
Water level, the one end at 5 top of non-porous interior bucket are equipped with seal assembly 11, and the side of non-porous interior bucket 5 is equipped with flange shaft 12, before flange shaft 12
End is opened wide, and debit's clothing is used for, and non-porous interior bucket 5 is fixedly connected by flange shaft 12 with outer barrel 4.
Water inlet system 2 includes inlet valve 21 and circulating pump 23, and inlet valve 21 is mounted on the inside of cabinet 1, and inlet valve 21
It is connect with extraneous tap, the water outlet of inlet valve 21 is communicated with water inflowing box 22, and water inflowing box 22 is for distributing laundry clothes, liquid detergent
Or softener, the one end of water inflowing box 22 far from inlet valve 21 are connected to outer barrel 4, circulating pump 23 passes through spray tube 24 and spray head 25
Slurry is sprayed into non-porous interior bucket 5, circulating pump 23 is located at the bottom of 1 inner cavity of cabinet, and the output end of circulating pump 23 is communicated with
Spray tube 24, spray tube 24 are equipped with spray head 25 far from one end of circulating pump 23.
Drainage system 3 includes draining pump 31, and slurry is discharged outside complete machine by pipeline for draining pump 31, and draining pump 31
In the bottom of 1 inner cavity of cabinet, the intake-outlet of draining pump 31 is communicated with drainpipe 32, one end and the outer barrel 4 of drainpipe 32
Bottom connection, the other end of drainpipe 32 run through and extend to the outside of cabinet 1.
It is provided with heating device 41, damper 42 in outer barrel 4, hang spring 43, bearing block 44 and is fixedly mounted on bearing block 44
Internal bearing 45, heating device 41 are fixedly mounted on the rear lower of outer barrel 4, and heating device 41 heats slurry,
After slurry reaches water level, heating device 41 heats slurry, when being heated to the temperature of program setting,
Slurry is sprayed into non-porous interior bucket 5 by circulating pump 23, damper 42 be fixedly mounted on the lower part of outer barrel 4 and in cabinet 1
The bottom of chamber is fixedly connected, and hangs the top that spring 43 is mounted on outer barrel 4, and the top for hanging spring 43 is fixedly connected with the inner wall of cabinet 1, axis
The outside that seat 44 is fixedly mounted on outer barrel 4 is held, and the one end of bearing block 44 far from outer barrel is fixedly connected with the inner wall of cabinet 1, used
It makes rotating motion in the non-porous interior bucket 5 of support.
Seal assembly 11 includes cavity 111, spring 112, centrifugation body 113, sealing element 114, sealing ring 115, in cavity 111
Portion is equipped with guide rod A, spacing collar B, is equipped with several apopore C in 111 wall week of cavity, and sealing element 114 is mounted on centrifugation body 113,
Centrifugation body 113 can move back and forth on the guide rod A inside cavity 111, and spring 112 passes through guide rod A, is mounted on guide rod A
Among spacing collar B, and as the reciprocating motion of centrifugation body 113 is extruded or is discharged.
Non-porous interior bucket 5 is equipped with taper, and section middle section is in isosceles trapezoid, and both ends are cylindrical, is equipped in its front several
Under dewatering state, water flow under the influence of centrifugal force, can facilitate drainage hole D towards the movement outside of the front of non-porous interior bucket 5
Improve drainage efficiency.
Seal assembly 11 is converted between washing state and dewatering state according to the revolving speed of non-porous interior bucket 5, when non-porous interior bucket 5
In the state of washing, seal assembly 11 is in close state, and can seal non-porous interior bucket 5, when non-porous interior bucket 5 is in dewatering state
When, seal assembly 11 is in the open state, so that the slurry of non-porous interior bucket 5 is discharged to outer barrel 4
Working principle:
Seal assembly 11 has washing state and dewatering state, when roller washing machine is in washing, the revolving speed of non-porous interior bucket 5
It is generally located in 40-55 and turns seal assembly 11 and be in washing state, i.e. sealing state, at this time elastic force of the sealing element 114 in spring 112
Under seal the drainage hole D of non-porous 5 front of interior bucket, when in dewatering state, control system guarantees that non-porous interior bucket turns this in 60-100
Section, continuous service several minutes are centrifuged body 113 under the influence of centrifugal force at this time, towards interior bucket movement outside, band dynamic seal
114 compressed springs 112, so that the drainage hole D in non-porous interior bucket 5 is spatially connected to the water outlet C on cavity 111, it is non-porous
Slurry in interior bucket 5 flows out outer barrel 4.
Non-porous interior bucket is to be full of nothing in slurry in the effect in several minutes that 60-100 turns this section continuous service
When the interior bucket 5 of hole, the clothing eccentric load in non-porous interior bucket 5 is very big, needs after first slurry is discharged, guarantees that the vibration of complete machine exists
In controlled range, high speed dewatering is run later.
The water intake mode of roller washing machine is as follows: slurry enters water inflowing box 22 by inlet valve 21 and water supply hose,
Liquid detergent or softener for rinsing in water inflowing box 22 enter outer barrel 4 later；Water level sensor 6 perceives slurry and reaches
To when setting water level, that is, stop water inlet；Post heating device 41 start to work, slurry is heated, when being heated to set
When determining temperature, that is, stop heating；Circulating pump 23 is started to work later, and slurry is sprayed into nothing by spray tube 24 and spray head 25
Clothing is washed in hole interior bucket 5.
In conclusion the roller washing machine of the non-porous interior bucket, is made by the cooperation between non-porous interior bucket 5 and seal assembly 11
With, be connected to non-porous interior bucket 5 directly with outer barrel 4, i.e., it is no between interior bucket 5 non-porous in washing process and outer barrel 4 to wash use
Water, and in dehydration, slurry is discharged by the seal assembly 11 in non-porous interior bucket 5, effectively prevents non-porous interior bucket
5,4 inner wall of outer barrel and flange shaft 12 adhere to lint and dirt, facilitate cleaning, avoid the feelings for causing secondary pollution to clothing
Condition.
In the present invention unless specifically defined or limited otherwise, fisrt feature in the second feature " on " or " down " can be with
It is that the first and second features directly contact or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature be directly above or diagonally above the second feature, or be merely representative of
First feature horizontal height is higher than second feature.Fisrt feature can be under the second feature " below ", " below " and " below "
One feature is directly under or diagonally below the second feature, or is merely representative of first feature horizontal height less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
Centainly refer to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be any
One or more embodiment or examples in can be combined in any suitable manner.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (7)
1. a kind of roller washing machine of non-porous interior bucket, it is characterised in that: including cabinet and be located in the box body portion water inlet system,
The outside of drainage system, outer barrel, non-porous interior bucket, water level sensor, driver, door body and control panel, the door body is equipped with door
Lid sealing ring, the water level sensor end of probe run through and extend to the inside of outer barrel, and one end at the top of the non-porous interior bucket is set
There is seal assembly, the side of the non-porous interior bucket is equipped with flange shaft, and the non-porous interior bucket is fixedly connected by flange shaft with outer barrel.
2. the roller washing machine of non-porous interior bucket according to claim 1, it is characterised in that: the water inlet system includes water inlet
Valve and circulating pump, the inlet valve is mounted on the inside of cabinet, and inlet valve is connect with extraneous tap, and the inlet valve goes out
The mouth of a river is communicated with water inflowing box, and the water inflowing box is connected to far from one end of inlet valve with outer barrel, and the circulating pump is located in the box body chamber
Bottom, the output end of the circulating pump is communicated with spray tube, and the spray tube is equipped with spray head far from one end of circulating pump.
3. the roller washing machine of non-porous interior bucket according to claim 1, it is characterised in that: the drainage system includes draining
Pump, the draining pump are located in the box body the bottom of chamber, and the intake-outlet of the draining pump is communicated with drainpipe, the drainpipe
One end be connected to the bottom of outer barrel, the other end of the drainpipe runs through and extends to the outside of cabinet.
4. the roller washing machine of non-porous interior bucket according to claim 1, it is characterised in that: be provided with heating in said tub
Device, damper hang spring, bearing block and the bearing being fixedly mounted on inside bearing block, and the heating device is fixedly mounted outside
The rear lower of bucket, the damper is fixedly mounted on the lower part of outer barrel and is fixedly connected with the bottom of cabinets cavity, described to hang spring
It is mounted on the top of outer barrel, the top for hanging spring is fixedly connected with the inner wall of cabinet, and the bearing block is fixedly mounted on outer barrel
Outside, and the one end of bearing block far from outer barrel is fixedly connected with the inner wall of cabinet.
5. the roller washing machine of non-porous interior bucket according to claim 1, it is characterised in that: the seal assembly includes chamber
Body, spring, centrifugation body, sealing element, sealing ring, the inside cavity are equipped with guide rod A, spacing collar B, cavity wall week are equipped with several
Apopore C, the sealing element are mounted on centrifugation body, and the centrifugation body can move back and forth on the guide rod A in portion in the cavity, institute
State spring across guide rod A, be mounted among guide rod A and spacing collar B, and with centrifugation body reciprocating motion be extruded or
Release.
6. the roller washing machine of non-porous interior bucket according to claim 1, it is characterised in that: the non-porous interior bucket is equipped with cone
Degree, section middle section are in isosceles trapezoid, and both ends are cylindrical.
7. the roller washing machine of non-porous interior bucket according to claim 1, it is characterised in that: the seal assembly is according to non-porous
The revolving speed of interior bucket is converted between washing state and dewatering state, when the non-porous interior bucket is in the state of washing, the sealing group
Part is in close state, and can seal non-porous interior bucket, and when the non-porous interior bucket is in dewatering state, the seal assembly is in and beats
Open state, so that the slurry of non-porous interior bucket is discharged to outer barrel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811067956.8A CN109281117A (en) | 2018-09-13 | 2018-09-13 | The roller washing machine of non-porous interior bucket |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811067956.8A CN109281117A (en) | 2018-09-13 | 2018-09-13 | The roller washing machine of non-porous interior bucket |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109281117A true CN109281117A (en) | 2019-01-29 |
Family
ID=65181123
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811067956.8A Pending CN109281117A (en) | 2018-09-13 | 2018-09-13 | The roller washing machine of non-porous interior bucket |
Country Status (1)
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| WO2020182015A1 (en) * | 2019-03-13 | 2020-09-17 | 青岛海尔滚筒洗衣机有限公司 | Drainage sealing device of a drum washing machine and drum washing machine |
| WO2020182014A1 (en) * | 2019-03-13 | 2020-09-17 | 青岛海尔滚筒洗衣机有限公司 | Drum washing machine |
| WO2020181986A1 (en) * | 2019-03-13 | 2020-09-17 | 青岛海尔滚筒洗衣机有限公司 | Drainage sealing device, and front-loading washing machine and control method therefor |
| CN111691148A (en) * | 2019-03-13 | 2020-09-22 | 青岛海尔滚筒洗衣机有限公司 | Drainage sealing device of drum washing machine and drum washing machine |
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| WO2022062728A1 (en) * | 2020-09-25 | 2022-03-31 | 青岛海尔滚筒洗衣机有限公司 | Washing machine control method and washing machine |
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| WO2022068525A1 (en) * | 2020-09-30 | 2022-04-07 | 无锡小天鹅电器有限公司 | Control method for front-loading washing machine, front-loading washing machine, and computer storage medium |
| CN112111906B (en) * | 2019-06-03 | 2024-07-16 | 青岛海尔洗衣机有限公司 | Washing machine and control method thereof |
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