WO2014205886A1

WO2014205886A1 - Automatic cleaning washer

Info

Publication number: WO2014205886A1
Application number: PCT/CN2013/080414
Authority: WO
Inventors: 舒海; 许升; 李海涛; 王玲臣
Original assignee: 海尔集团公司; 青岛海尔洗衣机有限公司
Priority date: 2013-06-28
Filing date: 2013-07-30
Publication date: 2014-12-31
Also published as: DE112013007198B4; JP6210351B2; KR20160022861A; US20160145792A1; DE112013007198T5; JP2016536057A

Abstract

An automatic cleaning washer comprises an inner barrel (2) and an outer barrel (1). Cleaning particles (4) for cleaning the inner wall of the outer barrel (1) and the outer wall of the inner barrel (2) are disposed in a chamber (3) between the inner barrel (2) and the outer barrel (1). The following one, two or three improved structures are disposed on the inner surface of an outer barrel bottom (5): a sloping area (7) disposed on the inner surface of the outer barrel bottom (5), the area being disposed along a circumferential direction, a position close to a center (8) of the outer barrel bottom being higher than a position close to an outer barrel sidewall (9), and a water discharging opening (6) of the outer barrel bottom (5) being disposed on a lowest position of the outer barrel bottom (5); a ring water passage (12) disposed on the inner surface of the outer barrel bottom (5), adjacent to the outer barrel sidewall (9) and recessed along a circumferential direction, and the water discharging opening (6) of the outer barrel bottom (5) being in communication with the ring water passage (12); and a water blocking convex rib (13) disposed one side facing the water discharging opening (6), of a surface of the outer barrel bottom (5), and disposed on one side of the water discharging opening (6) of the outer barrel bottom (5) along a rotation direction when the inner barrel (2) performs dehydration. The improved structure of the outer barrel bottom (5) of the washer greatly improves the speed and the scouring strength of a water flow, and accordingly, the cleaning particles (4) can be completely discharged.

Description

Self-cleaning washing machine

The invention relates to the field of washing machines, in particular to a self-cleaning washing machine which is provided with cleaning particles between inner and outer barrels to automatically clean the wall between the inner and outer barrels as the water flows.

Background technique

The existing pulsator washing machine is a closed environment between the inner and outer barrels. Only the water flow can pass. Due to the limitations of the above structure of the washing machine and the particularity of the use environment, after 3-5 months of use, the outer wall of the inner barrel and The inner wall of the outer tub will adhere to dirt, which will breed different degrees of bacteria, and most of the bacteria that breed are harmful to the human body. With the improvement of people's living standards and the improvement of quality of life requirements, the solution to the health problems of washing machines has become very urgent. The investigation of the internal environment of the washing machine by relevant scientific research institutions shows that the seriousness of the internal pollution of the washing machine has been increasingly valued by consumers. In order to fundamentally avoid the secondary dirt of the washing machine to the laundry and to better be responsible for the health of the user, the cleaning problem of the internal environment of the washing machine has become an urgent problem to be overcome.

Chinese Patent No. 200820183308. 4 discloses a drum washing machine with barrel cleaning, which comprises an inner barrel, an outer barrel and a plurality of round silicone balls for cleaning the inner and outer barrel walls, and the rotation of the inner barrel is used to drive the flow of water during washing. Thereby, the silica gel ball between the inner barrel and the outer barrel of the washing machine is moved and continuously hits the two walls of the inner and outer barrels to achieve the purpose of cleaning the inner and outer barrel walls.

However, in the above-mentioned washing machine structure, after the drainage, since the rubber ball or the flexible particles are freely scattered in the barrel, a large noise is generated in the high-speed dehydration process, and the energy consumption of the washing machine is increased, which affects the life of the washing machine.

In addition, the applicant discloses in Chinese application 201010160548. 4 a washing machine and a method for cleaning the inner and outer barrels of a washing machine using flexible granules, wherein the washing machine adopts a law of placing flexible granules between the inner and outer barrels of the washing machine, and the water in the washing process. The sexual flow drives the flexible particles to impact and rub the inner and outer barrel walls of the washing machine to clean the inner and outer barrels of the washing machine.

However, the above-mentioned washing machine structure has the following drawbacks: If the flexible particles are always placed between the inner and outer barrels, the collision with the inner and outer barrel walls during the dehydration of the washing machine generates a large noise, which also damages the particles and reduces the effect of the particles on the cleaning effect; The cleaning particles are discharged, the above structure is difficult to completely discharge, and there are still residual particles during dehydration; in addition, since the gap between the bottom of the inner tub and the bottom of the outer tub is small, the water flow is difficult to wash between the inner and outer tub bottoms for a long time. The dirt accumulation is large and it is not easy to handle, and the cleaning particles of the above structure cannot achieve self-cleaning of the inner bottom region.

The present invention has been made in view of the above. SUMMARY OF THE INVENTION The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art, and to provide a self-cleaning washing machine that improves the drainage flow rate to discharge cleaning particles to the bottom of the tub. In order to solve the above technical problem, the basic idea of adopting the technical solution of the present invention is: a self-cleaning washing machine comprising an inner tub and an outer tub, wherein a chamber between the inner tub and the outer tub is provided to rotate with water to clean the inner wall of the outer tub and the outer wall of the inner tub The cleaning particles are provided on the inner surface of the outer tub bottom with one or two or three modified structures as follows: First improvement: an inclined region provided on the inner surface of the outer tub bottom, the region is arranged in the circumferential direction, close to The height of the center of the bottom of the outer tub is higher than the height of the side wall of the outer tub, and the bottom drain of the outer tub is set at the lowest point of the bottom of the outer tub; the second improvement: the inner surface of the bottom of the outer tub, the side wall of the adjacent outer tub The annular water channel is recessed in the circumferential direction, and the bottom bottom drain port communicates with the annular water channel; the third improvement: a water retaining rib is provided on a side of the bottom surface corresponding to the drain port of the outer tub, and rotates along the inner tub when dehydrating The direction of the bottom of the outer bottom of the bucket is set. Further, the height of the inner surface of the bottom of the outer tub is gradually lowered from the center toward the side wall of the tub in the radial direction, and the bottom of the outer tub has a conical structure with a high center and a low circumference. Further, the height of the inner surface of the bottom of the outer tub is gradually lower in the circumferential direction clockwise or counterclockwise, and the direction of the lowering is related to the direction of rotation when the inner tub of the washing machine is dehydrated.

Further, the height of the inner surface of the outer tub bottom is inclined to the horizontal plane by an angle α 0 < α 30° in the radial direction. Further, the inner surface height of the outer tub bottom is inclined at an angle to the horizontal plane in the radial direction. α 0< α ^ 3 ° The difference between the highest and lowest heights is 5_30mm when it is gradually decreasing in the circumferential direction, or 1/10-1/3 of the minimum distance between the inner and outer barrel bottoms. Further, the depth of the annular channel It is gradually clockwise or counterclockwise in the circumferential direction, and the downward direction is related to the direction of rotation when the inner tub of the washing machine is dehydrated. The drain port is located at the lowest point of the annular water channel, and one side is adjacent to the shallowest portion of the annular water channel. Alternatively, the width of the annular water channel is gradually widened clockwise or counterclockwise in the circumferential direction, and the direction of change is related to the direction of rotation when the inner tub of the washing machine is dehydrated. The drain opening is located at the widest point of the annular water channel, and the side is narrowest at the narrowest point of the annular water channel. Adjacent. Further, the annular water channel is formed by being gradually inclined from the center of the outer tub bottom toward the outer side wall of the tub and engaging with the outer side wall of the outer tub. Further, the annular waterway has a width of 10 - 60 and a depth of 3 - 15 Further, the water retaining rib is formed by a radial rib from a center of the outer tub bottom to the side of the drain port, and the radial rib is tangent to the side of the drain port. Alternatively, the water retaining rib is formed by an arcuate rib on the side of the bottom of the outer tub to the side of the drain, and the contour of the curved rib and the side of the drain is smoothly transitioned. Further, the water retaining rib has a height of 5-20 mm. Further, the water retaining rib is formed by a height difference section between the highest and lowest joints when the bottom surface of the outer tub is gradually changed clockwise or counterclockwise in the circumferential direction. The cleaning granules are arranged between the inner and outer barrels to clean the inner and outer barrel walls, and the principle that the washings in the inner tub rub the inner barrel to prevent the dirt from breeding bacteria; the cleaning particles may be sponge materials or rubber or Plastic foams, such as foamed rubber, foamed plastics, foamed composite polyurethanes, preferably with adsorbent materials, make it better to clean the barrel wall, the cleaning particles must have a certain elasticity, and the density in the dry state It is smaller than water, has the property of being saturated with water in water, and is inexpensive. Even if it is not reused, the cost per discharge is not high. The cleaning particles used are spherical, square, elliptical, cylindrical, tetrahedral or other irregular agglomerated particulate matter, the number of which is 10-50, and the density of these particles is smaller than water, which has a certain Elasticity and wear resistance. After the washing machine of the present invention is finished, in order to avoid the noise generated by the cleaning particles hitting the barrel wall between the inner and outer barrels during high-speed dehydration, and reducing the service life of the inner and outer barrels, the water flows through the drainage water by washing particles before draining and high-speed dehydration. The mouth is discharged or collected and reused. In order to save resources and reduce the use cost, the washing machine of the present invention preferably reuses the cleaning particles, and a drainage device is arranged under the outer tub of the washing machine to communicate with the drain port, and the device collects the cleaning particles by draining dehydration during drainage and dehydration, and blocks the cleaning. At the same time, the granules can smoothly discharge the swarf, the sheet material such as coins, buttons and the like and other small things smaller than the cleaning particles to avoid clogging; when the water enters again, the cleaning granules float upward with the rise of the water level, and are separated from the drainage. The device enters the chamber between the inner and outer barrels by the drain port, and continues to clean the wall between the inner and outer barrels as the water flows. The self-cleaning washing machine of the present invention controls different movements of the inner tub during the draining process and/or the dehydrating process, so that the washing particles flow into the drain port together with the washing water, are collected by the drain device or directly discharged, and the inner tub is controlled during the draining process. -50 rpm / low rotation, so that the cleaning particles between the inner and outer barrel walls fall between the inner and outer barrels, and flow into the drainage port along with the water in the outer barrel; during the dehydration stage, the inner barrel is controlled to perform at least one braking action. The cleaning particles between the inner and outer barrel walls fall between the inner and outer barrels and flow into the drainage port along with the water poured out from the clothes. After adopting the above technical solutions, the present invention has the following advantageous effects as compared with the prior art. The washing machine of the present invention rotates in the inner and outer barrels due to the non-stop rotation of the pulsator or the inner barrel during the washing process. The water in the inner tank exchanges with the water in the inner tub to form a water flow, which drives the cleaning particles placed in the chamber between the inner and outer barrels to swim in the water, collides and rubs against the barrel wall between the inner and outer barrels, and simultaneously assists in water soaking. The cleaning of the inner and outer barrel walls and the bottom of the inner barrel bottom prevents the generation of dirt and eliminates the growth of bacteria. When the user washes the clothes, the inner and outer barrels are also cleaned, washed at any time, cleaned at any time, leaving no dirt, and clean. The improved structure of the outer tub bottom according to the present invention is a structure in which the bottom surface of the outer tub is inclined downward from the center of the outer tub bottom to the circumferential direction, a tilting and descending structure which is consistent with the dehydration rotation direction in the circumferential direction, and a circumferential annular water passage structure. And the water retaining rib structure on one side of the drain port, the above structure enables the cleaning particles on the bottom surface of the outer tub to completely flow into the drain port with the water flow when draining, and avoids the cleaning particles when the partial cleaning particles are dehydrated due to the stranding in the outer tub. Noise is generated by hitting the barrel wall. DRAWINGS

1 is a schematic structural view of an inner and outer barrel of a washing machine according to the present invention;

Figure 2 is a schematic view of the outer tub bottom of the washing machine of the present invention;

3 is a cross-sectional view taken along line A-A of FIG. 2; FIG. 4 is a cross-sectional view taken along the line B-B of FIG. 2; FIG. 5 is a schematic view showing the structure of the outer tub according to the present invention; detailed description

The specific embodiments of the present invention are described in further detail below with reference to the accompanying drawings.

As shown in FIG. 1, the washing machine of the present invention comprises an outer tub 1 and an inner tub 2, and a cleaning granule 4 of a cleaning bucket wall is arranged in a chamber 3 between the outer tub 1 and the inner tub 2, during the washing/rinsing process, The water flow drives the cleaning particles placed between the inner and outer barrels to swim, colliding and rubbing the inner and outer barrel walls, and at the same time cleaning the inner and outer barrel walls and the bottom barrel bottom under the aid of water immersion; in order to avoid the high-speed dehydration stage of the clothes, Cleaning the pellets between the inner and outer barrels causes noise pollution, so the cleaning particles need to be discharged or collected for reuse.

The washing machine of the invention adopts recycling and reuse of the cleaning particles, and a particle recovery device is installed under the water outlet of the washing machine, and the cleaning particles are blocked and recovered in the lower part of the drainage port every time the drainage is performed, and the drainage includes drainage when dehydrating; The buoyancy of the water is used to float the cleaning particles from the drain to the chamber between the inner and outer barrels. During the drainage process, the inner tub is controlled to rotate at a low rotation speed, so that the cleaning particles between the inner and outer barrel walls fall between the inner and outer barrels, and flow into the drainage port along with the water in the outer barrel; in the dehydration stage, the inner barrel is controlled to perform at least one braking action. , causing the cleaning particles between the inner and outer barrel walls to fall inside Between the outer tubs, drain into the drain with the water from the clothes. When draining, the inner bucket rotates in the same direction at a low speed to drive the water flow to rotate. The centrifugal force of the water flow acts on the inner wall of the outer tub. When the water level is lowered to the bottom drain port position, the water flow first flows into the bottom drain port under the action of centrifugal force. The inner tub rotates in the same direction as the draining phase during dehydration. As shown in Fig. 2, the present invention improves the inner surface of the outer tub bottom 5 so that the washing particles are easily flowed into the drain port 6 with the water flow during the draining process, and the inner tub rotates during the draining process. The improvement of the outer tub bottom 5 includes one or two or three combinations of the following four structures: the bottom surface of the outer tub is inclined downwardly, the structure 10, 11, the outer bottom annular water channel 12 structure, and the drain port 6 - side The structure of the water retaining rib 13 is. Specifically: Embodiment 1

As shown in FIG. 2 and FIG. 3, in the embodiment, the improvement of the outer tub bottom is specifically: the structure 10 of the bottom surface of the outer tub is inclined downwardly from the center 8 of the outer tub bottom toward the outer side wall 9 of the outer tub, and the outer tub The inner surface of the bottom 5 is provided with a surface inclined area 7, which is arranged in the circumferential direction, the height of the position near the center 8 of the outer tub bottom is higher than the height of the position near the side wall 9 of the outer tub, and the washing machine drain 6 is provided at the bottom of the outer tub. At the office. When the structure is favorable for drainage, especially when the amount of water in the late stage of drainage is small, the drainage water flows the cleaning particles into the drainage port. The surface inclined area 7 is a structure which is gradually lowered from the center 8 of the outer tub bottom toward the edge. Specifically, the inner surface height of the outer tub bottom 5 is gradually lowered from the center 8 toward the outer side wall 9 of the tub body in the radial direction, and the outer tub bottom 5 is a cone-shaped structure with a high center and a low circumference. The angle α between the inner surface of the outer tub bottom 5 and the horizontal plane in the radial direction is 0 < α 30° (see Fig. 3). The surface inclined area is an annular area, and the radial width L, that is, the difference between the outer radius and the inner radius of the annular area and the outer barrel bottom radius R satisfy: R/5<L<R. Embodiment 2 As shown in FIG. 2 and FIG. 4, in the embodiment, the improvement of the outer tub bottom is specifically: the inclined gradually lowering structure 11 which is consistent with the dehydration rotation direction of the inner tub in the circumferential direction, and the inner surface height of the outer tub bottom 5 along the circumference The direction is gradually clockwise or counterclockwise, and the direction of the downward direction is the same as the direction of rotation when the inner tub of the washing machine is dehydrated. Generally, the dehydration direction of the inner drum of the existing washing machine is clockwise, so the inner surface height of the outer tub bottom 5 is gradually lower clockwise (refer to FIG. 2), and the drain port 6 is disposed at the lowest point of the outer bottom of the tub, 14 and the highest side. At 15 adjacent. The structure not only facilitates the discharge of the cleaning particles when draining, but also facilitates the cleaning of the particles which may remain in the outer tub when the water is removed from the clothes before the high-speed dewatering. The cleaning particles generally become low in the inner and outer barrels after draining. At the gap, the inner tub rotates to fall off the bottom of the tub. Specifically, when the height of the inner surface of the outer tub bottom 5 changes gradually along the circumferential direction, the height difference H between the highest point 15 and the lowest point 14 is 5-30 mm, or 1/10_1/3 of the minimum distance between the inner and outer barrel bottoms. Embodiment 3 This embodiment is a combination of Embodiment 1 and Embodiment 2. The change in the height of the inner surface of the outer tub bottom is: while gradually decreasing from the center toward the outside in the radial direction, the circumferential direction is also gradually lower, and the structure is further When it is drained, the cleaning particles are discharged into the drain port with the water flow. Each of the above embodiments has an inner surface of the outer tub bottom of the inclined structure, and the potential energy caused by the difference in the tilt height is converted into water flow energy to increase the impact force of the water flow, and the cleaning particles are prevented from remaining on the inner surface of the outer tub bottom. Embodiment 4

As shown in FIG. 2 and FIG. 5, in the embodiment, the improvement of the outer tub bottom is specifically as follows: the outer tub bottom 5 is adjacent to the outer tub side wall 9 and is provided with a concave annular water channel 12 in the circumferential direction, the drain port 6 and The annular water channels 12 are in communication. Preferably, the drain port 6 is disposed in the annular water channel 12, or the annular water channel 12 passes through the drain port 6 (refer to FIG. 5). Further, the depth of the annular water channel 12 is gradually decreased clockwise or counterclockwise in the circumferential direction, and gradually decreases. In the same direction as the rotation of the inner tub of the washing machine, the drain port 6 is disposed at the lowest point of the annular water channel 12, one side is adjacent to the shallowest portion of the annular water channel; and/or the width of the annular water channel 12 is clockwise or counterclockwise in the circumferential direction. The width is changed, and the direction of change is the same as the direction of rotation when the inner tub of the washing machine is dehydrated. The drain port 6 is disposed at the widest point of the annular water channel, and one side is adjacent to the narrowest portion of the annular water channel. The annular water channel 12 has a width of 10 - 60 and a depth of 3 - 15 or the annular water channel 12 has a width of 1 / 30 to 1 / 5 of the radius of the bottom of the barrel. In combination with the first embodiment, the annular water channel 12 described in this embodiment is The outer bottom center direction 8 is formed by the downward direction of the outer side wall 9 of the outer tub and the outer side wall 9 of the outer tub. Embodiment 5

As shown in FIG. 2 and FIG. 6, since the drain port 6 has two sides 61 62 in the circumferential direction of the outer tub bottom 3, according to the direction in which the inner tub is dehydrated and rotated, it is generally rotated clockwise, and one side 61 is rotated against the inner tub when dehydrating. The direction, that is, the side that first passes through the drain when rotating; the other side 62 is the direction of rotation when the inner tub is dehydrated, that is, the side that passes through the drain after the rotation. The surface of the outer tub bottom 3 corresponding to the embodiment of the present embodiment is provided with a water retaining rib 13 (see FIG. 2) corresponding to the rotation direction of the drain port 6 along the rotation direction of the inner tub. The inner tub rotates during dehydration and drainage, and the water flow is driven in one direction. Rotating, the water retaining rib 13 blocks the flow of water to form an enlarged drainage vortex at the drain port 6, increasing the flow rate, facilitating cleaning particles to enter the drain port 6, wherein the water retaining rib 13 is from the bottom of the tub The center 8 is formed by a radial rib on the side of the drain port 62, and the radial rib is tangential to the side 62 of the drain.

Alternatively, the water retaining rib 13 is formed by an arcuate rib of the outer bottom center 8 to the drain side 62, and the arcuate rib and the drain side 62 have a smooth transition. The height of the water retaining rib 13 in this embodiment is 5-20 mm, or 1/10_1/2 of the distance between the inner and outer barrel bottoms. Embodiment 6 This embodiment is a combination of Embodiment 2 and Embodiment 5. The water retaining rib 13 of the present embodiment has the highest and lowest joints when the bottom surface of the outer tub is gradually changed clockwise or counterclockwise in the circumferential direction. The height difference section is formed (see Fig. 6), and the drain port 6 is provided at the lowest portion 14 of the bottom of the tub, which is adjacent to the highest point 15 along the side 62 of the rotation direction of the inner tub. Embodiment 7 This embodiment is a combination of Embodiments 1, 2, 4 and Embodiment 5. The structural improvement of the outer tub bottom described in this embodiment includes: The bottom surface of the outer tub is radially oriented from the center 8 of the outer tub bottom. The structure 10 of the outer side wall 9 of the outer side of the outer tub is inclined downwardly, the inclined downward structure 11 which is consistent with the direction of dewatering rotation of the inner tub in the circumferential direction, the annular water channel 12 structure of the outer bottom of the outer tub, and the structure of the water retaining rib 13 of the side of the drain 6 (See Figure 2). The improved structure of the outer bottom of the barrel of the invention facilitates the discharge of the cleaning particles, especially when the drainage is finished and dewatered. Due to the flat structure of the existing outer bottom of the barrel, the cleaning particles are easily stranded on the bottom of the outer barrel when the water is small, and the structure of the present invention is used to increase The flow rate and the flushing force of the water flow can completely discharge the cleaning particles. The embodiments in the above-described embodiments may be further combined or substituted, and the embodiments are merely described for the preferred embodiments of the present invention, and are not intended to limit the scope and scope of the present invention. Various changes and modifications made by those skilled in the art to the technical solutions of the present invention are within the scope of the present invention.

Claims

claims

1. A self-cleaning washing machine, including an inner barrel and an outer barrel. The chamber between the inner barrel and the outer barrel is provided with cleaning particles that rotate with the water flow to clean the inner wall of the outer barrel and the outer wall of the inner barrel. It is characterized by: at the bottom of the outer barrel. The surface is provided with one, two or three of the following improved structures:

The first improvement: an inclined area provided on the inner surface of the outer barrel bottom. This area is arranged along the circumferential direction. The height near the center of the outer barrel bottom is higher than the height near the side wall of the outer barrel. The drain outlet at the bottom of the outer barrel is located outside. The lowest point at the bottom of the barrel;

The second improvement: An annular water channel is provided on the inner surface of the outer barrel bottom and adjacent to the side wall of the outer barrel and is concave along the circumferential direction. The drain outlet at the bottom of the outer barrel is connected with the annular water channel;

The third improvement: A water-blocking rib is provided on the side of the bottom surface of the outer barrel corresponding to the drain outlet, and is provided on the drain outlet side of the bottom of the outer barrel along the direction of rotation of the inner barrel during dehydration.

2. The self-cleaning washing machine according to claim 1, characterized in that: the height of the inner surface of the outer barrel bottom gradually decreases along the radial direction from the center toward the side wall of the outer barrel, and the outer barrel bottom is higher in the center and lower around the perimeter. conical structure.

3. The self-cleaning washing machine according to claim 1 or 2, characterized in that: the height of the inner surface of the outer barrel bottom gradually decreases clockwise or counterclockwise along the circumferential direction, and the decreasing direction is consistent with the rotation direction of the inner barrel of the washing machine during dehydration. related.

4. The self-cleaning washing machine according to claim 1 or 2, characterized in that: the height of the inner surface of the outer barrel bottom and the inclination angle between the horizontal plane and the radial direction α 0 < α 30°

5. The self-cleaning washing machine according to claim 3, characterized in that: the angle between the height of the inner surface of the outer barrel bottom and the inclination of the horizontal plane along the radial direction α 0 < α sC3°, when it gradually decreases along the circumferential direction. The height difference between the highest and lowest is 5-30 or 1/10-1/3 of the minimum distance between the inner and outer barrel bottoms

6. The self-cleaning washing machine according to claim 1, characterized in that: the depth of the annular water channel gradually decreases clockwise or counterclockwise along the circumferential direction, and the decreasing direction is related to the rotation direction of the inner barrel of the washing machine during dehydration, and the drainage outlet It is located at the lowest point of the annular water channel, and is adjacent to the shallowest part of the annular water channel on one side.

7. The self-cleaning washing machine according to claim 1 or 6, characterized in that: the width of the annular water channel gradually widens clockwise or counterclockwise along the circumferential direction, and the changing direction is related to the rotation direction of the inner barrel of the washing machine during dehydration. Drainage The mouth is located at the widest part of the annular water channel, and is adjacent to the narrowest part of the annular water channel on one side.

8. The self-cleaning washing machine according to claim 1 or 6, characterized in that: the annular water channel is formed by sloping downward from the center of the bottom of the outer tub toward the side wall of the outer tub and cooperating with the side wall of the outer tub.

9. The self-cleaning washing machine according to claim 1, characterized in that: the width of the annular water channel is 10-60mm and the depth is 3-15

10. The self-cleaning washing machine according to claim 1, characterized in that: the water-blocking convex rib is composed of a radial convex rib from the center of the outer barrel bottom to one side of the drain outlet, and the radial convex rib is connected to the One side of the drain outlet is tangent.

11. The self-cleaning washing machine according to claim 1, characterized in that: the water-blocking convex rib is composed of an arc-shaped convex rib from the center of the outer barrel bottom to the side of the drain outlet, and the arc-shaped convex rib is connected with the said water-blocking convex rib. The contours on the drain side transition smoothly.

12. The self-cleaning washing machine according to claim 10 or 11, characterized in that: the height of the water-blocking rib is 5-20mm.

13. The self-cleaning washing machine according to claim 10 or 11, characterized in that: the height of the water-blocking convex rib is gradually lowered from the bottom surface of the outer barrel in a clockwise or counterclockwise direction along the circumferential direction of the highest and lowest joints. Differential cross-section formation.