CN107780137B - Washing machine without water between inner and outer barrels and control method thereof - Google Patents

Abstract

The invention provides a washing machine without water between an inner barrel and an outer barrel and a control method thereof, wherein the washing machine comprises: an outer tub; the inner barrel is rotatably arranged in the outer barrel; the impeller is rotatably arranged at the bottom of the inner barrel; in the washing/rinsing process, the inner barrel is filled with water, and no water exists between the inner barrel and the outer barrel; the bucket wall of interior bucket sets up the row's husky passageway that is used for debris such as silt to discharge: in the washing/rinsing process of the washing machine, water flow cannot flow out of the sand discharge channel, and in the dewatering process, impurities such as silt washed by the water flow are discharged from the sand discharge channel. The washing machine without water between the inner barrel and the outer barrel discharges sand and other sundries on clothes by arranging the sand discharge channel on the inner barrel.

Description

A washing machine with no water between inner and outer tubs and a control method thereof

technical field

The invention relates to the technical field of laundry devices, in particular, to a washing machine with no water between inner and outer tubs and a control method thereof.

Background technique

As shown in FIG. 1 , the existing washing machine includes a casing 16 , an outer tub 15 and an inner tub 14A arranged in the casing 16 , and the inner tub 14A is rotatably arranged in the outer tub 15 . In order to realize the dehydration function of clothes, the wall of the inner tub 14A is covered with dehydration holes, so that when washing clothes, the washing water will flow from the dehydration holes to between the inner tub 14A and the outer tub 15, and this part of the washing water cannot be Fully utilized, resulting in waste of water resources.

In addition, due to the problem of water storage between the inner tub 14A and the outer tub 15, it will cause the outer wall of the inner tub 14A, the inner wall of the outer tub 15 and the area between the inner tub 14A and the outer tub 15 to breed dirt, contaminating the user's clothes, Seriously affect the user's laundry experience.

In order to solve the above-mentioned problems, as shown in FIG. 2, there is a washing machine in the prior art, the main structural feature of which is that there are no holes on the barrel wall of the inner tub 14B, so that during washing, only the inner tub 14B has water, and the inner tub 14B and the inner tub 14B have no holes. There is no water between the outer tubs 15, which not only saves the water consumption for laundry, but also prevents the growth of dirt between the inner tub 14B and the outer tub 15, avoids clothing pollution, improves the washing effect, and enhances the user experience.

After the above-mentioned washing machine without water between the inner tub and the outer tub is used for a period of time, since there are no holes on the inner tub 14B, the sediment and other debris after washing may not be discharged in time, which leads to the bottom of the inner tub 14B. The accumulation of debris such as sediment will affect the user's laundry effect.

In order to solve the problem of discharging sundries such as sediment in a washing machine without water between the inner tub and the outer tub during washing, the present invention is specially proposed.

SUMMARY OF THE INVENTION

In order to solve the above problems, the first purpose of the present invention is to provide a waterless washing machine between the inner and outer tubs, specifically, the following technical solutions are adopted:

A washing machine without water between inner and outer tubs, comprising:

outer barrel;

The inner barrel is rotatably arranged in the outer barrel;

and a pulsator, which is rotatably arranged at the bottom of the inner barrel;

During the washing/rinsing process, the inner barrel is filled with water, and there is no water between the inner barrel and the outer barrel;

The barrel wall of the inner barrel is provided with a sand removal channel for discharging debris such as sediment: during the dehydration process of the washing machine, the water flow washes the debris such as sediment and discharges the debris from the sand removal channel.

As a preferred embodiment of the present invention, the sand inlet of the sand removal channel is arranged at the bottom of the inner barrel and below the pulsator, and the sand outlet of the sand removal channel is arranged close to the injection port on the upper part of the inner barrel and leads to the inner barrel and the inner barrel. between the outer barrels;

The setting of the sand inlet and the sand outlet of the sand discharge channel satisfies that: during the dehydration process of the washing machine, the water flow washes the sediment and other sundries to be discharged from the sand discharge outlet.

As a preferred embodiment of the present invention, a sand discharge cover is installed on the barrel wall of the inner barrel, and a sand discharge channel is formed between the sand discharge cover and the barrel wall of the inner barrel;

The sand inlet of the sand discharge channel is set at the bottom of the inner barrel and below the pulsator, and the sand outlet of the sand discharge channel is set close to the upper part of the inner barrel and is higher than the highest water level of the washing machine.

As a preferred embodiment of the present invention, the sand discharge cover includes a top wall and side walls on opposite sides of the top wall, the side walls are in close contact with the inner wall of the inner tub, and the top wall and the inner wall of the inner tub are spaced to form Sand removal channel.

As a preferred embodiment of the present invention, the inner barrel includes an inner barrel bottom and a barrel body surrounded by a circle along the inner barrel bottom, the pulsator is rotatably mounted on the inner barrel bottom, and the upper end side wall of the barrel body open sand discharge openings;

One end of the sand discharge cover extends to the bottom of the inner barrel and forms a sand inlet of the sand discharge channel with the bottom of the inner barrel, and the other end cooperates with the sand discharge opening to form a sand discharge port of the sand discharge channel;

Preferably, the sand inlet of the sand discharge channel is arranged at the lowest position of the bottom of the inner barrel.

As a preferred embodiment of the present invention, the sand inlet of the sand removal channel is arranged at the lowest position of the bottom of the inner barrel, and the sand removal opening is opened on the upper end side wall of the barrel body.

As a preferred embodiment of the present invention, the end of the sand discharge cover extending to the bottom of the inner tub includes a first transverse wall extending toward the center of the inner tub, a first vertical wall connected to the first transverse wall and extending toward the bottom of the inner tub, and a first vertical wall connected to the first transverse wall and extending toward the bottom of the inner tub. a second transverse wall connected with the vertical walls and extending toward the center of the inner tub;

The first vertical wall is matched with the outer edge of the pulsator, and the second horizontal wall is spaced from the bottom of the inner barrel to form a sand inlet for a sand discharge channel.

As a preferred embodiment of the present invention, the inner barrel further includes a flange, the flange is installed on the bottom of the inner barrel, and the flange, the bottom and the barrel form a watertight inner barrel, the A gimbal is installed on the injection port on the upper part of the barrel;

A circle of dewatering holes is arranged on the barrel body near one end of the balance ring, and the sand discharge opening is located above the dewatering holes.

As a preferred embodiment of the present invention, the sand discharge cover includes a plurality of them, which are evenly distributed along the circumferential direction of the inner wall of the inner barrel;

Preferably, the sand discharge cover includes 1-6;

Further preferably, the sand discharge cover includes four.

The first purpose of the present invention is to provide a control method of a washing machine without water between the inner and outer tubs, specifically, the following technical solutions are adopted:

A method for controlling a washing machine without water between the inner and outer tubs as described above, the washing machine executes the washing/rinsing procedure, the pulsator rotates and stirs the water flow at the rotation speed ω1 to wash the clothes, and the water flow cannot pass through the sand discharge port of the sand discharge channel at the rotation speed ω1. outflow;

The washing machine executes the dehydration program, the pulsator and the inner tub rotate synchronously at the speed ω2 to dehydrate the clothes, and the water flow washes the sediment and other debris at the speed ω2 and is discharged from the sand discharge port of the sand discharge channel;

Among them, the rotational speed ω1 is smaller than the rotational speed ω2.

The third purpose of the present invention is to provide a control method of a washing machine without water between the inner and outer tubs, specifically, the following technical solutions are adopted:

A method for controlling a washing machine without water between the inner and outer tubs as described above, wherein the washing machine further includes a sand removal program, and the sand removal program includes:

The washing machine receives an instruction to start the sand removal program;

The washing machine controls the inner barrel to rotate at a rotational speed of ω3, and the sediment and other sundries in the inner barrel are discharged from the sand discharge port through the sand discharge channel under the centrifugal action;

The rotational speed ω3 is greater than the rotational speed ω1 and less than the rotational speed ω2, the rotational speed ω1 is the rotational speed of the washing machine during washing/rinsing, and the rotational speed ω2 is the rotational speed of the washing machine during dehydration.

In the washing machine without water between the inner and outer barrels of the present invention, the sediment and other sundries on the clothes can be discharged during the dehydration process by arranging a sand discharge channel on the inner barrel.

In addition, in order to ensure that there is no water between the inner tub and the outer tub of the washing machine during washing, it is required that debris such as sediment is only discharged from the sand discharge channel during dehydration. According to the working characteristics of the washing machine during washing and dehydration, the rotation speed of dehydration is greater than the rotation speed of washing, and the centrifugal force during dehydration is greater than the centrifugal force during washing/rinsing. Therefore, when setting the sand removal channel, the sand inlet and sand outlet of the sand removal channel should be set in such a way that the centrifugal force during the washing process cannot make the debris such as sediment be discharged from the sand removal channel, and the centrifugal force in the dehydration process makes the Sediment and other sundries are discharged from the sand discharge channel.

The invention utilizes the working characteristics of the washing machine to set the sand inlet and the sand discharge port of the sand discharge channel to realize the method of discharging debris such as sediment only during dehydration, with simple structure and low cost, and can effectively solve the problem of sediment remaining in the inner tub problems within.

Description of drawings

Fig. 1 is the structural representation of the existing washing machine with water between the inner and outer barrels;

2 is a schematic structural diagram of an existing waterless washing machine between the inner and outer barrels;

Figure 3 is a partial cross-sectional view of the washing machine without water between the inner and outer tubs of the present invention;

Figure 4 is a cross-sectional view of the washing machine without water between the inner and outer tubs of the present invention.

Description of the symbols in the drawings: 1-balance ring 2-sand discharge port 3-sand discharge cover 4-barrel body 5-pulsator 6-inner barrel bottom 7-flange plate 8-dehydration hole 9-first transverse wall 10-th A vertical wall 11-a second horizontal wall 12-installation openings 14A, 14B-inner barrel 15-outer barrel 16-shell 17-motor 18-drainage pipe.

Detailed ways

Below in conjunction with accompanying drawing, a kind of washing machine without water between inner and outer tubs of the present invention and its control method are described in detail:

Example 1

A washing machine with no water between inner and outer tubs of this embodiment includes: an outer tub;

The inner barrel is rotatably arranged in the outer barrel;

and a pulsator, which is rotatably arranged at the bottom of the inner barrel;

During the washing/rinsing process, the inner barrel is filled with water, and there is no water between the inner barrel and the outer barrel;

The barrel wall of the inner barrel is provided with a sand removal channel for discharging debris such as sediment: during the dehydration process of the washing machine, the water flow washes the debris such as sediment and discharges the debris from the sand removal channel.

In the washing machine without water between the inner and outer barrels of the present invention, the sediment and other sundries on the clothes can be discharged during the dehydration process by arranging a sand discharge channel on the inner barrel.

Further, the setting of the sand removal channel of the present invention satisfies that: during the washing/rinsing process of the washing machine, the water flow cannot flow out of the sand removal channel, and during the dehydration process, the water flow washes out debris such as sediment and discharged from the sand removal channel. This can ensure that during the washing/rinsing process, there is no water between the inner tub and the outer tub, and debris such as sediment is only discharged from the sand removal channel during dehydration.

In order to ensure that there is no water between the inner tub and the outer tub of the washing machine during washing, it is required that debris such as sediment is only discharged from the sand discharge channel during dehydration. In order to achieve this technical purpose, the following basic ideas can be adopted:

On the one hand, the timing of sand removal can be controlled by controlling the on-off of the sand removal channel. The on-off of the sand removal channel can be realized by the control of electrical components, or it can be realized by control according to the physical structure.

As an implementation method, an electrical valve for controlling the on-off of the sand discharge channel can be set up, and the valve can be controlled to be closed during washing/rinsing and opened during dehydration, and further control the sand discharge during dehydration.

As another implementation method, a physical switch can be set in the sand discharge channel to control its on-off. The physical switch uses the rotation speed during dehydration to be greater than the rotation speed during washing. Therefore, the centrifugal force during dehydration is greater. Under this centrifugal force, the physical When the switch is turned on, the sand removal channel is turned on for sand removal.

On the other hand, the sand removal channel can be set according to the characteristics of the washing machine in the washing process, mainly by setting the position of the sand inlet and the sand outlet of the sand removal channel to ensure that the washing water cannot be discharged from the sand removal channel during washing/rinsing. , During dehydration, the washing water can be discharged from the sand removal channel due to the greater centrifugal force.

According to the working characteristics of the washing machine during washing and dehydration, the rotation speed of dehydration is greater than the rotation speed of washing. Therefore, when setting the sand removal channel, it is only necessary to set the sand inlet and sand outlet of the sand removal channel according to this principle. the purpose of this invention.

Specifically, the setting method of the sand discharge channel in this embodiment is as follows: the sand inlet of the sand discharge channel is set at the bottom of the inner barrel and below the pulsator, and the sand discharge port of the sand discharge channel is set close to the injection port on the upper part of the inner barrel And lead to between the inner barrel and the outer barrel;

The sand inlet and sand outlet of the sand removal channel are set so that: during the washing/rinsing process of the washing machine, the water flow cannot flow out from the sand outlet; .

In this embodiment, the sand inlet of the sand removal channel is arranged at the bottom of the inner barrel and below the pulsator. The mouth is hidden under the pulsator to keep the inner barrel without holes.

In this embodiment, the sand discharge port of the sand discharge channel is set close to the injection port on the upper part of the inner barrel and leads between the inner barrel and the outer barrel, so as to ensure that during washing/rinsing, even if the washing water enters the sand discharge channel, due to the The height of the sand outlet can limit its discharge.

The sand removal channel of this embodiment can be formed by the inner barrel itself, and the barrel wall of the inner barrel is integrally formed to form a sand removal channel that penetrates up and down.

The sand removal channel in this embodiment can also be installed on the inner wall of the inner tub by the cover structure to form a sand removal channel that penetrates up and down.

Embodiment 2

As shown in Figures 3 and 4, in a washing machine without water between the inner and outer barrels of the present embodiment, a sand discharge cover 3 is installed on the barrel wall of the inner barrel, and a sand discharge channel is formed between the sand discharge cover 3 and the barrel wall of the inner barrel;

The sand inlet of the sand discharge channel is set at the bottom of the inner barrel and below the pulsator 5, and the sand outlet 2 of the sand discharge channel is set close to the upper part of the inner barrel and is higher than the highest water level of the washing machine.

In this embodiment, the sand discharge cover 3 is installed on the barrel wall of the inner barrel, and there is a certain gap between the sand discharge cover 3 and the barrel wall of the inner barrel to form a sand discharge channel. In this way, the structure and manufacturing method of the inner barrel do not need to be changed, it is easy to implement, the cost is low, and it is easy to popularize and implement.

The sand inlet of the sand removal channel is arranged at the bottom of the inner barrel and below the pulsator 5. On the one hand, it is beneficial for the sediment in the inner barrel to enter the sand removal channel, and on the other hand, the sand inlet of the sand removal channel can be hidden from the wave. Below the wheel 5, keep the inner barrel without holes.

The sand discharge port of the sand discharge channel is set close to the discharge port on the upper part of the inner barrel and is higher than the highest water level of the washing machine to ensure that even if the washing water enters the sand discharge channel during washing/rinsing, due to the height of the sand discharge port of the sand discharge channel Above the maximum water level of the washing machine to avoid water leaks during wash/rinse.

As a preferred implementation of this embodiment, the sand discharge cover 3 includes a top wall and side walls on opposite sides of the top wall, the side walls are in close contact with the inner wall of the inner tub, and the top wall and the inner wall of the inner tub are spaced apart Set up to form a sand discharge channel.

In this embodiment, the inner barrel includes an inner barrel bottom 6 and a barrel body 4 that forms a circle along the inner barrel bottom. The pulsator 5 is rotatably installed on the inner barrel bottom 6, and the upper end side wall of the barrel body 4 is provided with openings. Sand discharge opening; one end of the sand discharge cover 3 extends to the inner barrel bottom 6 and forms the sand inlet of the sand discharge channel with the inner barrel bottom, and the other end cooperates with the sand discharge opening to form the sand discharge port 2 of the sand discharge channel.

In this embodiment, a sand discharge opening is provided on the upper side wall of the barrel body 4, and the sand discharge cover 3 cooperates with the sand discharge opening to form a relatively sealed sand discharge opening. On the one hand, due to the covering of the sand discharge cover 3, the appearance of the inner barrel can be kept without holes.

Preferably, the sand inlet of the sand discharge channel in this embodiment is arranged at the lowest position of the bottom 6 of the inner barrel.

Therefore, in this embodiment, the sand inlet and the installation position of the sand outlet of the sand discharge channel are limited to ensure that during washing/rinsing, the washing water will not be discharged from the sand discharge channel, and during dehydration, debris such as sediment will not be discharged. It can be discharged from the sand discharge channel.

Further, the end of the sand discharge cover 3 extending to the bottom of the inner barrel 6 in this embodiment includes a first transverse wall 9 extending toward the center of the inner barrel, a first vertical wall 10 connected with the first transverse wall 9 and extending toward the bottom of the inner barrel, and a first vertical wall 10 extending toward the bottom of the inner barrel. A second horizontal wall 11 connected to the vertical wall 10 and extending toward the center of the inner barrel; the first vertical wall 10 is matched with the outer edge of the pulsator 5 , and the second horizontal wall 11 is spaced from the inner barrel bottom 6 to form a sand discharge channel. Sand inlet.

The sand discharge cover 3 of the present embodiment is designed at one end of the inner barrel bottom 6 according to the mechanism characteristics of the inner barrel bottom 6 and the pulsator 5 . Pay attention to the cooperation with the pulsator 5 so as not to affect the normal rotation of the pulsator 5 .

In addition, the first vertical wall 10 and the outer edge of the pulsator 5 are arranged at intervals, so that the sediment enters the lower part of the pulsator 5 and then enters the sand inlet of the sand discharge channel.

The inner barrel described in this embodiment further includes a flange 7, which is mounted on the inner barrel bottom 6, and the flange 7, the inner barrel bottom 6 and the barrel body 4 enclose a watertight inner barrel, and the barrel The gimbal 1 is installed on the injection port on the upper part of the body 4 . The tub body 4, the tub bottom 6, and the flange 7 together form a watertight inner tub, and the interior is filled with water for washing clothes.

In this embodiment, a circle of dewatering holes 8 is provided on one end of the barrel close to the balance ring 1 , and the sand discharge openings are located above the dewatering holes 8 . In this embodiment, the inner part of the balance ring 1 protrudes into the barrel 4, and the dehydration hole 8 is set facing the balance ring 1, so that the balance ring 1 can block the dehydration hole 8 in this circle, and the appearance of the inner barrel can be kept clean hole.

The location of the dehydration holes 8 in this embodiment can ensure that during washing/rinsing, the washing water will not be discharged from the dehydration holes, and during dehydration, the thrown water will be discharged to the outer tub through the dehydration holes 8 for further discharge.

In this embodiment, the sand discharge opening is arranged on the dewatering hole 8, which can certainly also realize that during washing/rinsing, the washing water will not be discharged from the sand discharge channel, and during dehydration, sediment and other sundries can be discharged from the sand discharge channel.

As an implementation of this embodiment, the sand discharge cover 3 includes a plurality of them, which are distributed evenly along the circumferential direction of the inner wall of the inner tub. A plurality of sand discharge channels are formed between the plurality of sand discharge covers 3 and the inner wall of the inner barrel, which is more conducive to the discharge of sediment.

Preferably, the sand removal covers include 1-6; further preferably, the sand removal covers include 4.

In order to realize the up-and-down installation of the sand discharge cover 3, in order to cooperate with the installation of the sand discharge cover 3, an installation port 12 is provided on the inner wall of the inner barrel bottom 6 corresponding to the sand discharge cover 3, and the rest of the inner wall of the inner barrel bottom 6 is provided with a week of stirring protrusions rise.

The washing machine without water between the inner and outer tubs of this embodiment:

(1) The barrel body 4, the barrel bottom 6, and the flange 7 together form a watertight inner barrel, and the interconnected parts of each component should be reliably sealed without water leakage.

(2) The bottom opening formed by the sand discharge cover 3 and the barrel bottom 6 should be located at the bottom of the inner barrel, so that the sediment can enter the sand discharge channel along the opening.

(3) The upper part of the barrel 4 and the upper part of the sand discharge cover 3 should be provided with a sand discharge opening to facilitate the discharge of sediment, and the opening should be higher than the height corresponding to the highest washing water level of the washing machine to avoid water leakage during the washing process.

(4) The sand discharge channel formed by the sand discharge cover 3, the barrel bottom 6 and the barrel body 4 should extend from the bottom of the inner barrel to the uppermost discharge opening, and the middle should be smooth to facilitate the discharge of sediment.

(5) A plurality of sand discharge covers 3 are allowed to be formed into an integrated structure, so as to facilitate the discharge of sediment.

(6) The sand discharge cover 3, the barrel bottom 6 and the barrel body 4 can preferably form an effective sealing cooperation, so as to facilitate the discharge of sediment.

The washing machine without water between the inner and outer tubs of this embodiment:

When washing/rinsing, the tub body 4, the tub bottom 6 and the flange 7 together form a watertight inner tub, and the water inside is used for washing clothes.

During the washing/rinsing process, if the clothes are contaminated with sediment and other foreign objects, the washed sediment will sink into the gap formed by the pulsator 5, the bottom of the bucket 6 and the flange 7 due to the action of gravity.

During dehydration, the motor 17 drives the inner barrel to rotate at a high speed, and the high-speed rotating water flow drives the sediment in the gap formed by the pulsator 5, the barrel bottom 6 and the flange 7, and forms along the sand discharge cover 3, the barrel bottom 6 and the barrel body 4. The sand discharge channel is raised to the sand discharge port 2, and the inner tub of the washing machine is thrown out, thereby solving the problem of sediment accumulation.

The waterless washing machine between the tubs formed in this embodiment has a simple structure, low cost, and can effectively solve the problem of sediment accumulation at the bottom.

Embodiment 3

The present embodiment provides a method for controlling a washing machine without water between the inner and outer tubs as described above:

The washing machine executes the washing/rinsing procedure, and the pulsator rotates and stirs the water flow at the rotation speed ω1 to wash the clothes, and the water flow cannot flow out from the sand discharge port of the sand discharge channel when the rotation speed is ω1;

The washing machine executes the dehydration program, the pulsator and the inner tub rotate synchronously at the speed ω2 to dehydrate the clothes, and the water flow washes the sediment and other debris at the speed ω2 and is discharged from the sand discharge port of the sand discharge channel;

Among them, the rotational speed ω1 is smaller than the rotational speed ω2.

The control method of this embodiment is simple, convenient, and easy to implement by setting the rotational speed ω1 during washing/rinsing and the rotational speed ω2 during dehydration to meet the requirements of sand removal.

Embodiment 4

This embodiment provides a method for controlling a washing machine without water between the inner and outer tubs as described above, wherein the washing machine further includes a sand removal program, and the sand removal program includes:

The washing machine receives the instruction to start the sand removal program;

The washing machine controls the inner barrel to rotate at a rotational speed of ω3, and the sediment and other sundries in the inner barrel are discharged from the sand discharge port through the sand discharge channel under the centrifugal action;

The rotational speed ω3 is greater than the rotational speed ω1 and less than the rotational speed ω2, the rotational speed ω1 is the rotational speed of the washing machine during washing/rinsing, and the rotational speed ω2 is the rotational speed of the washing machine during dehydration.

In this embodiment, by setting a sand removal program, the washing machine executes the rotation speed ω3 in the sand removal program, and the setting of the rotation speed ω3 satisfies that the debris such as sediment cannot be discharged from the sand removal channel at the rotation speed of washing/rinsing, and when the rotation speed ω3 is reached Or when it is larger, the sediment is discharged from the sand removal channel to achieve the sand removal effect.

The control method of the present embodiment does not need to change the washing program of the washing machine, and sets a separate sand removal program, so that the sand removal effect is better.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention in any form. Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Within the scope of the technical solution of the present invention, personnel can make some changes or modifications to equivalent examples of equivalent changes by using the above-mentioned technical content, but any content that does not depart from the technical solution of the present invention is based on the technical solution of the present invention. Substantially any simple modifications, equivalent changes and modifications made to the above embodiments still fall within the scope of the solutions of the present invention.

Claims (12)

1. A washing machine without water between inner and outer tubs, comprising: outer barrel; The inner barrel is rotatably arranged in the outer barrel; and a pulsator, which is rotatably arranged at the bottom of the inner barrel; During the washing/rinsing process, the inner barrel is filled with water, and there is no water between the inner barrel and the outer barrel; It is characterized in that, the barrel wall of the inner barrel is provided with a sand removal channel for discharging debris such as sediment: during the dehydration process of the washing machine, the water flow washes out debris such as sediment and the sand is discharged from the sand removal channel; A sand discharge cover is installed on the barrel wall of the inner barrel, and a sand discharge channel is formed between the sand discharge cover and the barrel wall of the inner barrel; The end of the sand discharge cover extending to the bottom of the inner barrel includes a first transverse wall extending toward the center of the inner barrel, a first vertical wall connected with the first transverse wall and extending toward the bottom of the inner barrel, and a first vertical wall connected with the first vertical wall and extending toward the center of the inner barrel. two horizontal walls; The first vertical wall is matched with the outer edge of the pulsator, and the second horizontal wall is spaced from the bottom of the inner barrel to form a sand inlet for a sand discharge channel; A dewatering hole is provided on the barrel wall of the inner barrel near the balance ring, and the sand discharging port of the sand discharging channel is set higher than the dewatering hole; wherein A valve for controlling the on-off of the sand discharge channel is provided in the sand discharge channel, and the control is configured to be closed during washing/rinsing and open during dehydration; and/or A switch for controlling the on-off of the sand removal channel is arranged in the sand removal channel, and the switch is configured to be turned on under the centrifugal force during dehydration, so that the sand removal channel is connected. 2. A kind of washing machine without water between inner and outer barrels according to claim 1, is characterized in that, The sand inlet of the sand removal channel is arranged at the bottom of the inner barrel and below the pulsator, and the sand outlet of the sand removal channel is arranged close to the injection port on the upper part of the inner barrel and leads between the inner barrel and the outer barrel; The setting of the sand inlet and the sand outlet of the sand discharge channel satisfies that: during the dehydration process of the washing machine, the water flow washes the sediment and other sundries to be discharged from the sand discharge outlet. 3. a kind of washing machine without water between the inner and outer barrels according to claim 1 or 2, is characterized in that, The sand inlet of the sand discharge channel is set at the bottom of the inner barrel and below the pulsator, and the sand outlet of the sand discharge channel is set close to the injection port on the upper part of the inner barrel and is higher than the highest water level of the washing machine. 4. A kind of washing machine without water between the inner and outer barrels according to claim 3, is characterized in that, The sand discharge cover includes a top wall and side walls on opposite sides of the top wall, the side walls are in close contact with the inner wall of the inner tub, and a sand discharge channel is formed between the top wall and the inner wall of the inner tub. 5. The washing machine without water between the inner and outer tubs according to claim 3, wherein, The inner barrel includes an inner barrel bottom and a barrel body surrounded by a circle along the inner barrel bottom, the pulsator is rotatably installed on the inner barrel bottom, and a sand discharge opening is provided on the upper end side wall of the barrel body; One end of the sand discharge cover extends to the bottom of the inner barrel and forms a sand inlet of the sand discharge channel with the bottom of the inner barrel, and the other end cooperates with the sand discharge opening to form a sand discharge port of the sand discharge channel. 6 . The washing machine without water between the inner and outer tubs according to claim 5 , wherein the sand inlet of the sand discharge channel is arranged at the lowest position of the bottom of the inner tub. 7 . 7. The washing machine without water between the inner and outer tubs according to claim 5, characterized in that, The inner barrel also includes a flange plate, the flange plate is installed on the bottom of the inner barrel, the flange plate, the inner barrel bottom and the barrel body are enclosed to form a watertight inner barrel, and a balance ring is installed on the injection port on the upper part of the barrel body. ; A circle of dewatering holes is arranged on the barrel body near one end of the balance ring, and the sand discharge opening is located above the dewatering holes. 8. The washing machine without water between the inner and outer tubs according to claim 3, wherein, The sand discharge cover includes a plurality of them, which are distributed evenly along the circumferential direction of the inner wall of the inner barrel. 9 . The washing machine without water between inner and outer tubs according to claim 8 , wherein the sand discharge covers comprise 1-6 pieces. 10 . 10 . The washing machine without water between the inner and outer tubs according to claim 8 , wherein the sand discharge covers comprise four. 11 . 11. A method for controlling a washing machine without water between the inner and outer tubs according to any one of claims 1-10, wherein, The washing machine executes the washing/rinsing procedure, and the pulsator rotates and stirs the water flow at the rotation speed ω1 to wash the clothes, and the water flow cannot flow out from the sand discharge port of the sand discharge channel when the rotation speed is ω1; The washing machine executes the dehydration program, the pulsator and the inner tub rotate synchronously at the speed ω2 to dehydrate the clothes, and the water flow washes the sediment and other debris at the speed ω2 and is discharged from the sand discharge port of the sand discharge channel; Among them, the rotational speed ω1 is smaller than the rotational speed ω2. 12. A method for controlling a washing machine without water between the inner and outer tubs according to any one of claims 1-10, wherein the washing machine further comprises a sand removal program, and the sand removal program comprises: The washing machine receives the instruction to start the sand removal program; The washing machine controls the inner barrel to rotate at a rotational speed of ω3, and the sediment and other sundries in the inner barrel are discharged from the sand discharge port through the sand discharge channel under the centrifugal action; The rotational speed ω3 is greater than the rotational speed ω1 and less than the rotational speed ω2, the rotational speed ω1 is the rotational speed of the washing machine during washing/rinsing, and the rotational speed ω2 is the rotational speed of the washing machine during dehydration.

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