JP7547512B2 - washing machine - Google Patents

Description

The present invention belongs to the field of washing machines, specifically, to a washing machine that does not require cleaning, in which wash water does not cross-flow between the inner and outer tubs, and in particular, to a washing machine that can filter and collect lint from a non-perforated inner tub.

Generally, a washing machine of the prior art includes an inner tub and an outer tub, with the inner tub attached inside the outer tub. The outer tub is used to contain wash water, and clothes are placed in the inner tub. A washing structure such as a pulsator is also attached inside the inner tub. The inner tub and/or the pulsator rotate when driven by a motor to generate a wash water flow to wash the clothes. During the washing process, the inner tub is connected to the outer tub through a spin hole provided in the inner tub, so that water is stored inside both the inner tub and the outer tub. Therefore, the following three problems exist in a typical washing machine of the prior art.

Firstly, water is wasted. Only the water in the inner tank is needed during actual operation.

Secondly, bacteria grow. The water at the connection between the inner and outer tubs cannot be completely drained, and it is impossible to clean it, so with long-term use, bacteria will grow in the outer tub and contaminate clothes.

Thirdly, the presence of an outer tub significantly reduces the capacity of the washing machine. With a typical washing machine, the only way to increase the capacity is to enlarge the entire structure of the washing machine, which ends up taking up an excessive amount of the user's living space, making it extremely inconvenient for users with small floor plans.

To solve the above problems, the applicant has provided a washing machine with a hole-free inner tub. In this washing machine, the inner tub is made into a sealed container without spin-drying holes, so that the wash water is stored in the inner tub, and the inner tub has two functions: water storage and spin-washing. This avoids the problem that the space between the inner and outer tubs cannot be cleaned because the wash water flows between them, resulting in contamination.

However, because the non-perforated inner tub is a sealed inner tub, lint and other debris that falls off clothes during the washing process remains in the wash water. When the washing machine is drained, the lint accumulates near the drain of the non-perforated inner tub, causing the drain to become clogged and preventing the washing machine from draining properly.

In addition, because the non-perforated inner tub is sealed, it is difficult to expel lint that gets mixed into the wash water during the washing process. In particular, in the final spin stage, the drain water flow weakens, but the centrifugal force must be applied to the water and it must rise to the drain outlet at the top of the inner tub before it can be discharged. This further weakens the drainage force, causing a large amount of lint to remain in the inner tub, significantly affecting the washing machine's ability to clean clothes.

In addition, the lint filters of conventional washing machines cannot collect lint indefinitely, and are not equipped with a function to quickly clean the lint filter each time the washing machine processes clothes. As a result, the washing machine continues to operate with the lint filter in a saturated state, which can easily cause problems such as the lint filter being unable to quickly and effectively collect lint in the tub.

In view of the above, we propose the present invention.

The technical problem that this invention aims to solve is to provide a washing machine that solves the problems that occur during the washing process of a washing machine that does not require cleaning, such as lint accumulating in the drain of the non-perforated inner tub, clogging the drain, and leaving a large amount of lint in the non-perforated inner tub, in order to eliminate the defects of the prior art.

In order to solve the above technical problems, in a first aspect, the present invention discloses a washing machine that includes an inner tub that constitutes a rotatable water storage tank, in which a lint filter is provided, and in which water in the inner tub passes through the lint filter, filtering out lint in the passing water.

The lint filter further has a filtration chamber inside. The lint filter is provided with a water inlet and a water outlet that connect the filtration chamber to the inside of the inner tank. The water inlet and the water outlet are each provided with a check valve that controls the flow direction of the water. Either the inside of the filtration chamber, the water outlet, or the check valve, or a combination of these, is provided with a filtering structure that filters lint in the passing water flow, and is used to trap the lint inside the filtration chamber.

The inner tank also has a dirt discharge hole. The dirt discharge hole connects the lint filter chamber to the outer tank outside the inner tank.

Alternatively, a water collection tank is provided below the inner tub. A flow path is provided on the side wall of the inner tub, extending vertically downward, with the lower end of the flow path extending into the water collection tank. The dirt discharge hole is used to connect the filtration chamber of the lint filter to the flow path, and to discharge the blocked lint from the dirt discharge hole to the outside of the inner tub together with the drainage water from the washing machine.

In addition, the filtration chamber inside the lint filter is equipped with a centrifugal valve structure that controls the opening and closing of the dirt discharge hole. When the rotation speed of the inner tank reaches a specified value, the valve core of the centrifugal valve structure is subjected to the action of centrifugal force and opens the dirt discharge hole.

The inner tank has a vertical axis and is a tank-like structure with an open upper end. The lint filter is installed in the middle of the side wall of the inner tank. The side wall of the inner tank is tapered, with a larger radial size at the upper end and a smaller radial size at the lower end.

In addition, multiple lint filters are distributed on the side walls of the inner tub, with each lint filter spaced symmetrically about the axis of the inner tub.

Furthermore, the inner tub has multiple wash water levels. At least a portion of the lint filter is higher than the minimum wash water level in the inner tub, and preferably the highest portion of the lint filter is lower than the maximum wash water level in the inner tub.

In addition, there are multiple drainage holes distributed at the top end of the inner tank. The inner tank is rotatably fitted into the outer tank, and each drainage hole connects the inner tank to the outer tank.

Alternatively, a drain outlet is provided at the top end of the inner tank, and a water collection tank is provided below the inner tank. A flow path is provided on the side wall of the inner tank, extending vertically downward. The upper end of the flow path is connected to the drain outlet, and the lower end extends into the water collection tank. The drain outlet connects the inside of the inner tank to the water collection tank outside the inner tank through the flow path, and is used to discharge water that has risen to the mouth of the inner tank due to centrifugal force from the drain outlet to the outside of the inner tank.

The centrifugal valve structure further includes a valve core that can move to seal or open the hole, a centrifugal device that is connected to the valve core and that uses centrifugal force to pull the valve core and open the hole when the inner tank rotates at high speed, and an elastic member that is connected to the valve core and that moves the valve core against the centrifugal force and closes the hole when the inner tank rotates at low speed.

The lint filter further includes a casing. The casing is engaged with and attached to the inside of the side wall of the inner tank. The casing and the inner tank surround the filtration chamber. A first opening and a second opening are respectively installed on both sides of the casing of the lint filter that face each other in the rotation direction of the inner tank. A valve body that can rotate around an axis is respectively installed in the first opening and the second opening. The rotation axis of the valve body is parallel to the axis of the inner tank. The valve body rotates toward the inside of the casing when struck by the water flow, and can open the opening, and is restricted in position by the casing so that it cannot rotate outside the casing. As a result, when the inner tank rotates around the axis, the water flow strikes the valve body of one opening, causing it to rotate inward and opening the corresponding opening, but the valve body of the other opening is restricted in position by the casing and closes the corresponding opening. As a result, the effect of selectively opening and selectively closing the openings on both sides of the lint filter is achieved. In addition, a water outlet is provided on the side of the casing that faces the inside of the inner tank and/or on the upper and lower sides. The water outlet is provided with a lattice structure that filters lint from the outflowing water flow.

By using the above technical solution, the present invention has the following beneficial effects compared to the prior art:

By installing a lint filter in the holeless inner tub to filter and collect lint in the wash water, the amount of lint remaining in the wash water is reduced and the cleaning effect is improved. In particular, by installing a dirt discharge hole with a centrifugal valve in the lint filter so that the lint collected by the lint filter can be swept away together with the drain water flow from the washing machine, the effect of automatically cleaning the lint filter using the drain water flow every time a wash is performed is achieved.

In a second aspect, the present invention provides a washing machine that includes an inner tub that constitutes a rotatable water storage tank, the inner tub is provided with a drain outlet, and the drain outlet is provided with a lint filter.

Furthermore, the lint filter is one or a combination of a lattice structure, a mesh structure, and a comb-tooth structure that covers the drain.

Furthermore, the lint filter is an integral part of the inner tub. Alternatively, the lint filter is an independent part that is fixedly attached to the inner tub. Preferably, a balance ring is attached to the inner tub, and the lint filter is fixedly connected to the balance ring or is molded integrally therewith.

The lint filter is attached to the inner circumference of the side wall of the inner tub and has a ring-shaped structure that covers the drain outlet. The lint filter and the inner wall of the inner tub together surround a water passage space, which communicates with the outside of the inner tub through the drain outlet. The water passage space communicates with the inside of the inner tub through the filtering gaps in the lint filter.

Preferably, the upper and lower sides of the annular lint filter are directly or indirectly connected to the inner wall of the inner tank.

The inner tub has a vertical axis and is a tub-like structure with an open upper end. The side wall of the inner tub is tapered, with a larger radial size at the upper end and a smaller radial size at the lower end. At least one drain outlet is provided in the ceiling of the side wall of the inner tub. A ring-shaped lint filter is provided on the inner periphery of the ceiling of the inner tub.

The lint filter further includes a plurality of filter teeth distributed at intervals along the circumferential direction of the inner tank, and the gaps between adjacent filter teeth form filter gaps that allow the water flow to pass through. The width d of the filter gap is smaller than the hole diameter D of the drain outlet. Preferably, the filter teeth have a sheet-like structure, and if the included angle between the sheet-like filter teeth and the radial cross section of the inner tank is a, a is equal to or greater than 0 and less than 90.

In addition, the annular lint filter is tapered, gradually shrinking from bottom to top.

The annular lint filter is further divided into an upper collecting section and a lower filtering section. The collecting section and filtering section are tapered with different taper degrees, the taper degree a2 of the collecting section being greater than the taper degree a1 of the filtering section. Alternatively, the collecting section is cylindrical, and the filtering section is tapered. Preferably, the filtering section is provided with a collecting tank that is recessed toward the inside of the water passage space and opens toward the inside of the inner tank.

Furthermore, each of the filtering comb teeth is connected through at least one fixed ring. Preferably, each of the filtering comb teeth is integrally installed with the fixed ring.

Furthermore, the lower end of each filter comb tooth is connected to the inner wall of the inner tank, and the upper end is connected to the inner wall of the inner tank via a water stop plate.

The water stop plate is installed horizontally and is annular, extending in the radial direction of the inner tank. The inner circumference of the annular water stop plate is connected to the upper ends of each filter comb tooth, and the outer circumference is connected to the inner circumference of the inner tank.

By using the above technical solution, the present invention has the following beneficial effects compared to the prior art:

By installing a lint filter that covers the drain in the non-perforated inner tub and filtering out lint in the drain water flow of the washing machine, the problem of lint in the wash water flowing to the drain and clogging the drain is prevented. This improves the smoothness of drainage in the washing machine. In particular, by making the lint filter tapered, the lint filtered by the lint filter can be moved upward by the impact of the drain water flow. This avoids the problem of lint accumulating below the lint filter and affecting the smoothness of drainage, and achieves the effect of improving the filtering efficiency of the lint filter.

In addition, the present invention has a simple structure, is highly effective, and is suitable for widespread use.

Specific embodiments of the present invention will be described in more detail below with reference to the accompanying drawings.

The drawings are used as part of the present invention for further understanding of the present invention. Furthermore, the schematic embodiments of the present invention and their explanations are used for interpreting the present invention, but do not unduly limit the present invention. Needless to say, the drawings described below are only a part of the embodiments, and a person skilled in the art can derive further drawings from these drawings without requiring creative labor.

FIG. 1 is a schematic structural diagram of a washing machine according to an embodiment of the present invention. FIG. 2 is a schematic structural diagram of a washing machine according to another embodiment of the present invention. FIG. 3 is a schematic diagram of an enlarged structure of part A in FIG. 1 in an embodiment of the present invention. FIG. 4 is a schematic structural diagram of the lint filter when closed, taken along line BB in FIG. 3, in the embodiment of the present invention. FIG. 5 is a schematic structural diagram of the lint filter when opened, taken along line BB of FIG. 3 in the embodiment of the present invention. FIG. 6 is a schematic structural diagram of a washing machine according to a further embodiment of the present invention. FIG. 7 is a schematic diagram of an enlarged structure of part C in FIG. 6 in an embodiment of the present invention. FIG. 8 is a schematic diagram of a side structure of a lint filter according to an embodiment of the present invention. FIG. 9 is a schematic structural diagram of a lint filter according to an embodiment of the present invention. FIG. 10 is a schematic diagram of an enlarged structure of part C in FIG. 6 in another embodiment of the present invention. FIG. 11 is a schematic diagram of a side structure of a lint filter according to another embodiment of the present invention. FIG. 12 is a schematic structural diagram of a lint filter according to another embodiment of the present invention.

It should be noted that these drawings and written descriptions are not intended to limit the scope of the inventive concept in any manner, but are intended to explain the inventive concept to those skilled in the art with reference to specific embodiments.

In order to clarify the purpose, technical solution and advantages of the embodiments of the present invention, the following will clearly and concisely describe the technical solution of the embodiments in combination with the drawings of the embodiments of the present invention. Note that the following embodiments are for the purpose of explaining the present invention and are not intended to limit the scope of the present invention.

In describing the present invention, it should be explained that the directions or positional relationships indicated by terms such as "upper," "lower," "front," "rear," "left," "right," "vertical," "inner," and "outer" are directions or positional relationships based on the illustrations, and are merely for the convenience and simplification of the description of the present invention, and do not expressly or imply that the subject devices or components have a specific orientation and must be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting the present invention.

In describing the present invention, the terms "attach," "connect," and "connect" should be interpreted broadly unless otherwise clearly defined and limited as a point to be explained. For example, they may be fixed connections, removable connections, or integral connections. They may also be mechanical connections or electrical connections. Furthermore, they may be direct connections or indirect connections via intermediate media. A person skilled in the art would be able to interpret the specific meanings of the above terms in the present invention according to the specific circumstances.

As shown in Figures 1 to 5, in this embodiment, a washing machine will be described. The washing machine includes a housing 2. An inner tub 1 is provided in the housing 2. The axis of the inner tub 1 is installed vertically. The inner tub 1 is configured so that its upper end is open, forming a tub mouth 101, and its bottom end is sealed to form an inner tub bottom 103. The inner tub mouth 101 and the inner tub bottom 103 are connected by the inner tub side wall 102. In addition, no through holes are provided in at least the middle and lower tub walls of the inner tub 1 so that the inside of the inner tub 1 forms a water storage tank installed so that the ceiling part is open. In addition, a door 4 that can be opened outward is attached to the upper end of the housing 2 of the washing machine. Therefore, the purpose of putting clothes into the inner tub 1 from the tub mouth 101 of the inner tub after the door 4 is opened is realized. The lower part of the inner tub 1 is attached to the housing 2 of the washing machine via the inner tub support member 3. The inner tub support member 3 is installed coaxially with the inner tub 1. The inner tub support member 3 is connected to the housing 2 of the washing machine via a vibration-damping suspension rod or vibration-damping support leg. This achieves the purpose of mounting the inner tub support member 3 in the housing 2 of the washing machine so that it can vibrate. In addition, in order to rotate the inner tub 1, the center of the inner tub bottom 103 is installed coaxially with the motor shaft of the driving motor 5 of the washing machine. In addition, both the inner tub 1 and the driving motor 5 are fixedly installed on the inner tub support member 3. Preferably, the inner tub bottom 103 and the driving motor 5 are installed on both the upper and lower sides of the inner tub support member 3, respectively. The driving motor 5 is fixedly connected to the inner tub support member 3. The motor shaft of the driving motor 5 penetrates the inner tub support member 3 via a bearing and is fixedly connected coaxially to the inner tub bottom 103. In addition, the motor shaft of the driving motor 5 is rotatable relative to the inner tub support member 3. This allows the inner tub 1 and drive motor 5 to be attached to the inner tub support member 3, and the inner tub 1 can be rotated independently by the action of the drive motor 5, thereby achieving the purpose of washing the clothes inside.

Furthermore, a relatively rotatable agitating structure is installed within the inner tub 1. The agitating structure can be any conventional device, such as a pulsator 10 or an agitating rod. As a result, under the action of the drive motor, the inner tub 1 and/or the agitating structure are rotated to form various water currents within the inner tub, and the water currents are used to process the clothes in the inner tub. In addition, a balance ring 11 is installed on the inner tub 1 to ensure stability during rotation of the inner tub. Preferably, the balance ring 11 is located at the tub mouth 101 of the inner tub.

Furthermore, because the inner tub forms a water storage tank when the washing machine performs washing, the clothes only come into contact with the wash water in the inner water storage tank during the washing process. This prevents cross-flow of wash water between the inner and outer tubs, which could cause the wash water between the inner and outer tubs to flow into the inner tub and contaminate the clothes, significantly improving the cleanliness of the wash performed by the washing machine. It also prevents the area between the inner and outer tubs from being contaminated by wash water, which could result in the washing machine not washing the clothes thoroughly.

In an embodiment of the present invention, the following setup is performed to discharge the water flow detached from the clothes in the inner tub 1 of the washing machine to the outside, and to seal and store water in the inner tub 1 during the operation of the washing machine for normal washing.

The washing machine in the embodiment of the present invention may be any washing machine in the prior art equipped with an inner tub 1 constituting a rotatable water storage tank. The inner tub 1 is tapered so that the diameter of the tub gradually increases from bottom to top. At least one drain port 7 is installed in the cross section of the maximum tub diameter at the ceiling of the inner tub 1. Therefore, in the normal washing and rinsing process of the inner tub 1, the washing water is not shaken off to the drain port 7 and does not flow out, and the inner tub 1 directly constitutes a water tank for storing the washing water and the rinsing water, and the washing water and the rinsing water stored in the inner tub are used to wash or rinse the clothes. On the other hand, in the process of the inner tub 1 performing dehydration and drainage, when the rotation speed of the inner tub 1 becomes higher than a predetermined value, the washing water flows upward under the centrifugal force, flows to the drain port 7 installed in the ceiling of the inner tub 1, and is smoothly discharged to the outside from the inner tub 1. This achieves the purpose of allowing a washing machine having a non-hole inner tub to normally execute a dehydration program. The washing machine in the embodiment of the present invention is not limited to the structure shown in the figure. For example, as shown in FIG. 1, a conventional washing machine may be used, and the washing machine may have an inner tub 1 that does not have spin holes at least in the middle and lower parts and forms a water storage tank during washing.

In addition, to ensure the tightness of the inner tub 1, an inner tub lid that can open and close the inner tub's tub port 101 can be installed on the inner tub 1, and the inner tub port 101 can be opened and closed appropriately. In addition, to prevent wash water from being accidentally discharged from the drain port 7, a centrifugal valve 8 that opens and closes the drain port 7 appropriately can be installed on the inner tub 1. As a result, the centrifugal valve 8 normally closes the drain port 7, but when the washing machine executes a spin cycle, the rotation speed of the inner tub is controlled to reach a predetermined value, and then the valve core of the centrifugal valve 8 opens the drain port 7 by centrifugal force, achieving the effect of smooth drainage.

In the embodiment of the present invention, the inner tub 1 of the washing machine serves as a water storage tank, and therefore, during the washing process of the washing machine, lint that falls off from the clothes during washing remains in the washing water, resulting in a problem that the lint returns to and remains on the washed clothes. To solve the above problem, in the present invention, a lint filter 6 is provided in the inner tub 1, which is a rotatable water storage tank of the washing machine. The water in the inner tub 1 is filtered by passing through the lint filter 6. The lint filter 6 filters the lint in the water that passes through it, and by realizing the collection of lint in the inner tub of the washing machine, the problem that lint mixed in the washing water remains on the washed clothes can be effectively avoided.

In the embodiment of the present invention, the lint filter 6 can be any conventional structure capable of filtering and collecting lint in the wash water. In the embodiment of the present invention, for convenience of description, the lint filter 6 is installed as follows. That is, as shown in Figures 3 to 5, the lint filter 6 is attached to the inner wall of the inner tub 1. The inside of the lint filter 6 is provided with a filter chamber 60. The lint filter 6 is provided with a water inlet 71 and a water outlet 72 that connect the filter chamber 60 to the inside of the inner tub 1. The water inlet 71 and the water outlet 72 are each provided with a check valve that controls the flow direction of the water flow. In the filter chamber 60, the water outlet 72, the check valve, or a combination thereof, a filter structure 73 that filters lint in the passing water flow is provided, and is used to dam the lint in the filter chamber 60.

In an embodiment of the present invention, as shown in FIG. 1, a dirt discharge hole 61 is provided in the inner tub 1. The dirt discharge hole 61 connects the filtration chamber 60 of the lint filter 6 to the outer tub 31 outside the inner tub 1. Preferably, an openable outer tub lid 12 is provided at the tub opening of the outer tub 31 to prevent the water flow from splashing to the outside.

Alternatively, as shown in FIG. 2, a dirt discharge hole 61 is provided in the inner tub 1, and a water collection tank 32 is provided below the inner tub 1. A flow path 9 extending vertically downward is provided in the side wall 102 of the inner tub, and the lower end of the flow path 9 extends into the water collection tank 32. The dirt discharge hole 61 is used to connect the filtration chamber 60 of the lint filter 6 to the flow path 9, and to discharge the blocked lint from the dirt discharge hole 61 together with the drainage water of the washing machine into the water collection tank 32 outside the inner tub 1.

In an embodiment of the present invention, a centrifugal valve 8 that controls the opening and closing of the dirt discharge hole 61 is installed in the filtration chamber 60 in the lint filter 6. When the rotation speed of the inner tub reaches a predetermined value, the valve core of the centrifugal valve 8 is subjected to the action of centrifugal force to open the dirt discharge hole 61.

When the washing machine normally executes the washing program, the centrifugal valve 8 closes the dirt discharge hole 61, so that the filter chamber 60 of the lint filter 6 communicates only with the inside of the inner tub 1. Therefore, after the washing water in the inner tub 1 passes through the lint filter 6, the lint is blocked in the filter chamber 60. As a result, the lint filter 6 achieves the effect of collecting the lint in the inner tub 1. On the other hand, when the washing machine executes the spin and drain programs, the inner tub rotates at high speed, so that the centrifugal valve 8 operates under centrifugal force and opens the dirt discharge hole 61. As a result, the filter chamber 60 of the lint filter 6 communicates with the inside and outside of the inner tub 1. In addition, the washing water in the inner tub 1 flows upward under centrifugal force, and passes through the lint filter 6 during the flow process, so that some of the washing water passes through the filter 6 and the dirt discharge hole 61 and flows out of the inner tub. During the outflow process, the lint collected in the filter chamber 60 is washed away together and pushed out of the inner tub 1. This flushes the lint collected by the lint filter 6 out of the inner tub 1, achieving the effect of automatically cleaning the lint filter 6.

In an embodiment of the present invention, a lint filter 6 is installed in the holeless inner tub. In addition, a dirt discharge hole 61 that communicates with the outside of the inner tub 1 is installed in the lint filter 6, and a centrifugal valve 8 structure is installed in the dirt discharge hole 61, which is controlled to open and close by the centrifugal force generated by the rotation speed of the inner tub. This allows the lint collected by the lint filter 6 to be washed away from the inner tub together with the drain water flow when the washing machine executes spin-drying or draining, thereby achieving the effect of automatically cleaning the lint filter 6.

As shown in Figs. 1 to 5, in the embodiment of the present invention, the inner tub 1 is a tub-like structure with a vertical axis and an open upper end. The lint filter 6 is installed in the middle of the side wall 102 of the inner tub. In order to ensure that the lint in the washing water is effectively collected and filtered by the lint filter 6, at least a part of the lint filter 6 is lower than the maximum washing water level in the inner tub 1 of the washing machine, and at least a part of the lint filter 6 is higher than the minimum washing water level in the inner tub 1 of the washing machine. In addition, in the embodiment of the present invention, the side wall 102 of the inner tub 1 of the inner tub is tapered with a large radial size at the upper end and a small radial size at the lower end. As a result, during the spin-drying and draining of the washing machine, the washing water in the inner tub 1 flows upward under the centrifugal force while adhering to the side wall 102 of the inner tub. During the flow, at least a part of the washing water flows into the filter chamber 60 of the lint filter 6, so that the effect of automatically cleaning the lint filter 6 using the drain water flow is achieved.

In an embodiment of the present invention, a plurality of lint filters 6 are distributed on the side wall 102 of the inner tub. The lint filters 6 are distributed symmetrically and at intervals about the axis of the inner tub 1, improving the filtering effect of the washing machine. This also makes it possible to perform a leveling process on the center of the inner tub 1, effectively preventing eccentric rotation of the inner tub.

In an embodiment of the present invention, as shown in FIG. 1, a plurality of drain ports 7 are distributed on the side wall 102 of the inner tank 1 at the upper end of the inner tank 1. The inner tank 1 is rotatably fitted into the outer tank 31, which constitutes the inner tank support member 3. In addition, each drain port 7 connects the inside of the inner tank 1 to the outer tank 31 outside the inner tank 1. Therefore, the cleaning water flowing out from the drain ports 7 of the inner tank 1 is collected in the outer tank 31, and can then be discharged to the outside from a drain pipe connected to the bottom of the outer tank 31. Preferably, an outer tank lid 12 that appropriately opens and closes the tank port of the outer tank 31 is installed on the outer tank 31 to prevent the cleaning water from scattering to the outside.

Alternatively, as shown in FIG. 2, a plurality of drain ports 7 are distributed at the upper end of the inner tank 1, and a water collection tank 32 is provided below the inner tank 1. In addition, a flow path 9 extending vertically downward is provided on the side wall 102 of the inner tank. The upper ends of the flow paths 9 are connected to the drain ports 7 in a one-to-one correspondence, and the lower ends of the flow paths 9 all extend into the water collection tank 32. The drain ports 7 connect the inside of the inner tank 1 to the flow path 9 outside the inner tank 1, and are used to discharge water that has risen to the tank mouth 101 of the inner tank due to centrifugal force from the drain ports 7 to the flow path 9, guide it through the flow path 9, and then flow into the water collection tank 32 outside the inner tank 1. Preferably, the water collection tank 32 and the inner tank 1 are installed coaxially. In addition, the radial size of the opening of the water collection tank 32 is larger than the radial size of the inner tank 1. More preferably, at least the lower end of the inner tank 1 extends into the water collection tank 32, and a gap is maintained between the outer wall of the inner tank 1 and the inner wall of the water collection tank 32. This allows all wastewater to flow into the water collection tank 32 while ensuring rotation of the inner tank.

3, in the embodiment of the present invention, the centrifugal valve 8 structure includes a dirt discharge hole 61 that is provided in the inner tank 1 and is installed to pass water through, and a centrifugal valve 8 that is attached to the inner tank 1 and is provided corresponding to the dirt discharge hole 61. The valve core of the centrifugal valve 8 blocks the dirt discharge hole 61. In addition, when the rotation speed of the inner tank 1 reaches a predetermined value, the valve core of the centrifugal valve 8 is opened by the action of centrifugal force. Preferably, the centrifugal valve 8 further includes an elastic member. The elastic member is sandwiched between the valve core and the inner tank 1, and imparts a restoring force to the valve core, thereby moving the valve core to block the dirt discharge hole 61. The above-mentioned centrifugal valve 8 may be any valve body structure in the prior art that can realize the opening of the hole by the action of centrifugal force. Naturally, the centrifugal valve 8 of the present application may be any conventional structure that is driven by the centrifugal force when the inner tank rotates and appropriately opens and closes the dirt discharge hole 61. In addition, in this application, the valve installed in the dirt discharge hole 61 is not limited to the centrifugal valve 8, but may be any other type of valve that can control the opening and closing of the dirt discharge hole 61, such as an electrically controlled valve or a hydraulic valve.

As shown in Figs. 1 to 3, in this embodiment, the centrifugal valve 8 can be installed as follows. That is, a dirt discharge hole 61 is provided in the side wall 102 of the inner tank, and the centrifugal valve 8 is attached to the inside of the side wall 102 of the inner tank. The centrifugal valve 8 includes a holder 65 attached to the inside of the inner tank 1. A counterweight 62 connected to the holder 65 by a hinge is attached to the holder 65. In addition, a valve plug 64 that can move up and down is provided in the dirt discharge hole 61. The valve plug 64 is connected to the counterweight 62 by a hinge. A return spring 66 is sandwiched between the valve plug 64 and the side wall 102 of the inner tank. As a result, when the counterweight 62 moves in a direction away from the axis of the inner tank 1 due to the action of centrifugal force when the inner tank 1 rotates, the valve plug 64 moves in the axial direction of the inner tank 1 at the hinge connection part, opening the dirt discharge hole 61.

In an embodiment of the present invention, the lint filter 6 can be any prior art lint filtering device capable of collecting lint in the wash water.

As shown in Figures 4 and 5, the lint filter 6 of the present application can be installed as follows. The lint filter 6 includes a casing 70. The casing 70 is engaged with and attached to the inside of the side wall 102 of the inner tank. The casing 70 and the inner tank 1 surround the filtration chamber 60. A first opening 711 and a second opening 712 are installed on both sides of the casing 70 of the lint filter 6 that face each other in the rotation direction of the inner tank 1. A valve body 74 that can rotate around an axis is installed in the first opening 711 and the second opening 712. The rotation axis of the valve body 74 is parallel to the axis of the inner tank 1. The valve body 74 rotates toward the inside of the casing 70 when impacted by the water flow, and can open the opening, and cannot rotate outside the casing 70 because its position is restricted by the casing 70. As a result, when the inner tub 1 rotates around its axis, the water flow impacts the valve body 74 of one of the openings, causing it to rotate inward and open the corresponding opening, while the valve body 74 of the other opening is restricted in position by the casing 70 to close the corresponding opening. As a result, the effect of selectively opening and selectively closing the openings on both sides of the lint filter 6 is achieved. In this way, the first opening 711 and/or the second opening 712 constitute the openable and closable water inlet 71 of the lint filter 6. The side of the casing 70 facing the inside of the inner tub 1 and/or the upper and lower sides are provided with a water outlet 72. The water outlet 72 is provided with a filtering structure 73 that filters the outflowing water flow for lint. As a result, the lint in the water flow passing through the filtering chamber 60 of the lint filter 6 is blocked by the filtering structure 73 within the filtering chamber 60, thereby realizing the collection of lint in the inner tub 1.

In the embodiment of the present invention, the filtering structure 73 is not limited to the filter hole structure illustrated in the present invention, but may be any of the conventional structures such as a filter net, a filter grid, and filtering comb teeth 600, or a combination of these. In addition, in the embodiment of the present invention, the filtering structure 73 is installed integrally with the casing 70. However, the filtering structure 73 is not limited to this, and the filtering structure 73 may be a separate member. The filtering structure 73 installed separately is attached to the casing 70 or the inner tub 1. Even in this case, it is possible to achieve the effect of performing lint filtering on the passing water flow.

During the laundry washing process, the inner tub 1 rotates the wash water clockwise or counterclockwise. The wash water then pushes open the check valve 74 installed on the side wall and enters the lint filter 6, passes through the filtering structure 73 on the front side plate and the opposing side plate of the lint filter 6, is filtered, and is then discharged from the water outlet 72 consisting of the filter hole. As a result, the lint remains in the filtering chamber 60, completing the filtering of the wash water in the inner tub 1.

The valve body 74 may be installed on only one side of the lint filter 6. That is, the water inlet 71 may be installed on only one side of the lint filter 6. Such a lint filter can filter lint only when the inner tub 1 rotates in one direction. As a preferred solution, as shown in Figures 4 and 5, the water inlets 71 equipped with check valves 74 are installed on both the left and right sides of the lint filter 6, which can provide a filtering effect in two directions. In this case, cleaning water can enter the lint filter 6 whether the inner tub 1 rotates clockwise or counterclockwise, making the filtering action more comprehensive.

As shown in Figures 6 to 12, in this embodiment, a washing machine will be described. The washing machine includes a housing 2. An inner tub 1 is provided in the housing 2. The axis of the inner tub 1 is installed vertically. The inner tub 1 is configured so that its upper end is open, forming a tub mouth 101, and its bottom end is sealed to form an inner tub bottom 103. The inner tub mouth 101 and the inner tub bottom 103 are connected by the inner tub side wall 102. In addition, no through holes are provided in at least the middle and lower tub walls of the inner tub 1 so that the inside of the inner tub 1 forms a water storage tank installed so that the ceiling part is open. In addition, a door 4 that can be opened outward is attached to the upper end of the housing 2 of the washing machine. Therefore, the purpose of putting clothes into the inner tub 1 from the tub mouth 101 of the inner tub after the door 4 is opened is realized. The lower part of the inner tub 1 is attached to the housing 2 of the washing machine via the inner tub support member 3. The inner tub support member 3 is installed coaxially with the inner tub 1. The inner tub support member 3 is connected to the housing 2 of the washing machine via a vibration-damping suspension rod or vibration-damping support leg. This achieves the purpose of mounting the inner tub support member 3 in the housing 2 of the washing machine so that it can vibrate. In addition, in order to rotate the inner tub 1, the center of the inner tub bottom 103 is installed coaxially with the motor shaft of the driving motor 5 of the washing machine. In addition, both the inner tub 1 and the driving motor 5 are fixedly installed on the inner tub support member 3. Preferably, the inner tub bottom 103 and the driving motor 5 are installed on both the upper and lower sides of the inner tub support member 3, respectively. The driving motor 5 is fixedly connected to the inner tub support member 3. The motor shaft of the driving motor 5 penetrates the inner tub support member 3 via a bearing and is fixedly connected coaxially to the inner tub bottom 103. In addition, the motor shaft of the driving motor 5 is rotatable relative to the inner tub support member 3. This allows the inner tub 1 and drive motor 5 to be attached to the inner tub support member 3, and the inner tub 1 can be rotated independently by the action of the drive motor 5, thereby achieving the purpose of washing the clothes inside.

Furthermore, a relatively rotatable agitating structure is installed within the inner tub 1. The agitating structure can be any conventional device, such as a pulsator 10 or agitating rod. As a result, under the action of the drive motor 5, the inner tub 1 and/or the agitating structure are rotated to form various water currents within the inner tub, and the water currents are used to process the clothes in the inner tub. In addition, a balance ring 11 is installed on the inner tub 1 to ensure stability when the inner tub rotates. Preferably, the balance ring 11 is located at the tub mouth 101 of the inner tub.

Furthermore, because the inner tub forms a water storage tank when the washing machine performs washing, the clothes only come into contact with the wash water in the inner water storage tank during the washing process. This prevents cross-flow of wash water between the inner and outer tubs, which could cause the wash water between the inner and outer tubs to flow into the inner tub and contaminate the clothes, significantly improving the cleanliness of the wash performed by the washing machine. It also prevents the area between the inner and outer tubs from being contaminated by wash water, which could result in the washing machine not washing the clothes thoroughly.

In an embodiment of the present invention, the following setup is performed to discharge the water flow detached from the clothes in the inner tub 1 of the washing machine to the outside, and to seal and store water in the inner tub 1 during the operation of the washing machine for normal washing.

The washing machine in the embodiment of the present invention may be any washing machine in the prior art equipped with an inner tub 1 constituting a rotatable water storage tank. The inner tub 1 is tapered so that the diameter of the tub gradually increases from bottom to top. At least one drain port 7 is installed in the cross section of the maximum tub diameter at the ceiling of the inner tub 1. Therefore, in the normal washing and rinsing process of the inner tub 1, the washing water is not shaken off to the drain port 7 and does not flow out, and the inner tub 1 directly constitutes a water tank for storing the washing water and the rinsing water, and the washing water and the rinsing water stored in the inner tub are used to wash or rinse the clothes. On the other hand, in the process of the inner tub 1 performing dehydration and drainage, when the rotation speed of the inner tub 1 becomes higher than a predetermined value, the washing water flows upward under the centrifugal force, flows to the drain port 7 installed in the ceiling of the inner tub 1, and is smoothly discharged to the outside from the inner tub 1. This achieves the purpose of allowing a washing machine having a non-hole inner tub to normally execute a dehydration program. The washing machine in the embodiment of the present invention is not limited to the structure shown in the figure. For example, as shown in FIG. 6, a conventional washing machine may be used, and the washing machine may have an inner tub 1 that does not have spin holes at least in the middle and lower parts and forms a water storage tank during washing.

In addition, to ensure the tightness of the inner tub 1, an inner tub cover that can open and close the inner tub's tub port 101 can be installed on the inner tub 1, and the inner tub's tub port 101 can be opened and closed appropriately. In addition, to prevent wash water from being accidentally discharged from the drain port 7, a centrifugal valve 8 that opens and closes the drain port 7 appropriately can be installed on the inner tub 1. As a result, the centrifugal valve 8 normally closes the drain port 7, but when the washing machine executes a spin cycle, the rotation speed of the inner tub is controlled to reach a predetermined value, and then the valve core of the centrifugal valve 8 opens the drain port 7 by centrifugal force, achieving the effect of smooth drainage (not shown in the figure).

As shown in Figures 7 to 12, in the embodiment of the present invention, the inner tub 1 of the washing machine serves as a water storage tank, and therefore, during the washing process of the washing machine, lint that has fallen off from the clothes remains in the washing water. As a result, when the washing machine drains the water, the lint flows toward the drain outlet 7 along with the drainage water, and the lint accumulates and clogs the drain outlet 7. To solve the above problem, in the present invention, a lint filter 6 is provided in the inner tub 1, which is a rotatable water storage tank of the washing machine. Lint mixed in the drain water flowing from the inner tub 1 toward the drain outlet 7 is filtered and blocked by the lint filter 6. This realizes filtering and blocking of lint during drainage from the inner tub of the washing machine to the outside, effectively avoiding the problem of lint mixed in the washing water clogging the drain outlet 7 of the non-perforated inner tub when it is discharged to the outside.

In an embodiment of the present invention, the lint filter 6 can have any conventional structure capable of filtering and collecting lint in the wash water. For example, the lint filter 6 has one or a combination of a lattice structure, a mesh structure, and a comb-tooth structure that covers the drain outlet 7, and the openwork filtration gaps of the lint filter 6 are made up of openwork lattice holes in the lattice structure, openwork holes in the mesh structure, and openwork parts in the comb-tooth structure. The openwork gaps allow the drain water flow to pass through, and the lint in the drain water flow is filtered and blocked by the lint filter 6.

In an embodiment of the present invention, the lint filter 6 may be an integral part of the inner tub 1. Alternatively, the lint filter 6 may be an independent part fixedly attached to the inner tub 1. Preferably, an annular balance ring 11 is attached to the inner tub mouth 101 in the ceiling of the inner tub 1, and the lint filter 6 is fixedly connected to the balance ring 11 or molded integrally. This achieves the effect of the lint filter 6 being fixedly attached to the inner tub 1 and rotating therewith.

As shown in Figures 6 to 12, in the embodiment of the present invention, the lint filter 6 is provided on the inner circumference of the side wall 102 of the inner tub and has a ring-shaped structure covering the drain port 7. The upper and lower sides of the ring-shaped lint filter 6 are connected to the inner wall of the inner tub 1, respectively, and the lint filter 6 and the inner wall of the inner tub 1 together surround a water passage space 602. The water passage space 602 communicates with the outside of the inner tub 1 through the drain port 7. The water passage space 602 also communicates with the inside of the inner tub 1 through the filtering gaps of the lint filter 6.

Of course, in the embodiment of the present invention, the water passage space 602 may be surrounded by indirectly connecting the upper and/or lower sides of the annular lint filter 6 to the inner wall of the inner tub 1 via other members. For example, a balance ring 11 is attached to the tank mouth 101 of the inner tub, the lower side of the annular lint filter 6 is connected to the inner wall of the inner tub 1, and the upper side of the annular lint filter 6 is connected to the lower side of the balance ring 11. In this way, the annular lint filter 6, the balance ring 11, and the inner wall of the inner tub 1 collectively surround the water passage space 602 (not shown in the figure).

By connecting the upper and lower sides of the annular filtering device to the inner wall of the inner tub, respectively, to form an annular water passage space 602, it becomes necessary to filter all of the drainage water flow from the inner tub through the lint filter 6, then have it flow into the water passage space 602 and discharge it to the outside through the drain outlet 7 of the inner tub. This ensures a remarkable technological advancement in preventing the drain outlet 7 of the holeless inner tub from becoming clogged with lint by filtering all of the drainage water flow from the washing machine.

In the embodiment of the present invention, the inner tub 1 has a tank-like structure with a vertical axis and an open upper end. The side wall 102 of the inner tub is tapered, with a larger radial size at the upper end and a smaller radial size at the lower end. At least one drain port 7 is provided in the ceiling of the side wall 102 of the inner tub. An annular lint filter 6 is provided on the inner periphery of the ceiling of the inner tub 1. Each drain port 7 is connected to the annular lint filter 6 and the water passage space 602 surrounded by the inner wall of the inner tub 1. As a result, the drain water flow that rises to the ceiling due to the action of centrifugal force when the inner tub rotates is filtered by the lint filter 6, and then discharged to the outside from the drain port 7 via the water passage space 602.

As shown in Figs. 6 to 12, in the embodiment of the present invention, the lint filter 6 includes a plurality of filter comb teeth 600 distributed at intervals along the circumferential direction of the inner tank, and the comb tooth gap d between adjacent filter comb teeth 600 constitutes a filter gap that allows water flow to pass. The comb tooth gap d is smaller than the hole diameter D of the drain outlet 7. Preferably, the filter comb teeth 600 have a sheet-like structure. If the included angle between the sheet-like filter comb teeth 600 and the radial cross section of the inner tank 1 is a, a is 0 or more and less than 90. The above cross section is a cross section of the inner tank located at the connection point between the outer periphery of the sheet-like filter comb teeth 600 and the inner tank, and the included angle a is the included angle between the above cross section and the cross section where the sheet-like filter comb teeth 600 are located.

In an embodiment of the present invention, the annular lint filter 6 is tapered, gradually shrinking from bottom to top. The lint trapped by the lint filter 6 moves upward due to the impact of the drain water flow. This allows the lint caught in the lint filter 6 to retreat from the bottom of the tapered lint filter 6, preventing the lint from accumulating at the bottom of the tapered lint filter 6. In addition, even a small drain water flow can pass through the filtering gaps of the lint filter 6, allowing for smooth drainage in the washing machine.

As shown in Figures 7 to 9, in an embodiment of the present invention, the annular lint filter 6 can be divided into a cylindrical upper collecting section 605 and a tapered lower filtering section 604. The collecting section 605 is in the shape of a tank coaxial with the inner tank 1. Preferably, in order to improve the lint collection efficiency of the collecting section 605, the collecting section 605 is provided with a collecting tank 606 that is recessed toward the water passage space 602 and opens to the radial side of the inner tank.

As shown in Figures 10 to 12, in an embodiment of the present invention, the annular lint filter 6 can be divided into an upper collection section 605 and a lower filtering section 604 with different taper degrees. The taper degree a2 of the tapered collection section 605 is greater than the taper degree a1 of the tapered filtering section 604.

By dividing the annular lint filter 6 into two parts, upper and lower, with different taper degrees, a bend is formed at the connection point between the two parts. As a result, the lint can be collected at the bend beyond the slope of the filter part with a taper angle of a1 due to the impact of the water flow and the centrifugal force when the inner tub rotates. In addition, since the collection part 605 with a taper angle of a2 has a certain extension length, the collected lint is blocked at that point. Furthermore, since the filtered lint is collected at the bend, no lint remains in the filter part 604 of the lint filter 6, or the amount of lint remaining is extremely small. Therefore, the drain water flow can smoothly enter the water passage space 602 surrounded by the lint filter 6 and the inner tub, and the flow of the drain water flow of the washing machine is not impeded.

As shown in Figs. 7 to 12, in an embodiment of the present invention, in order to further improve the filtering efficiency of the lint filter 6, the filtering comb teeth 600 of the lint filter 6 are provided with a collection tank 606 that is recessed toward the inside of the water passage space 602 and opens toward the inside of the inner tank. The collection tank 606 is also installed in the collection section 605 of the filtering comb teeth 600. As a result, the lint that is impacted by the drainage water flow is caught in the collection tank 606, preventing the accumulation of lint in the filtering section 604.

In an embodiment of the present invention, each of the filtering comb teeth 600 is connected through at least one fixing ring. Preferably, each of the filtering comb teeth 600 is installed integrally with the fixing ring. More preferably, as shown in Figures 7 to 12, the ceiling portion of each of the filtering comb teeth 600 is connected through a water stop plate 601. The water stop plate 601 constitutes the fixing ring. Moreover, the water stop plate 601 and each of the filtering comb teeth 600 are an integral member. As a result, the lint filter 6 composed of the multiple filtering comb teeth 600 forms a single annular integral structure, so the integrity of the lint filter 6 is guaranteed and installation is easy.

In the embodiment of the present invention, the lower end of each filter comb 600 is connected to the inner wall of the inner tub 1, and the upper end is connected to the inner wall of the inner tub 1 via a water stop plate 601. As a result, both the upper and lower ends of the lint filter 6 composed of the filter comb 600 are connected to the inner tub 1, respectively, to surround a water passage space 602 through which the drain water flow passes. Therefore, the drain water flow that flows upward while adhering to the inner wall of the inner tub 1 due to the action of centrifugal force is filtered by the lint filter 6, and then passes through the water passage space 602 and is discharged to the outside from the drain port 7. In addition, since the drain water flow is blocked by the water stop plate 601, the situation in which the drain water flow of the washing machine flows out of the water passage space 602 at the top and is then splashed from the tub port 101 of the inner tub is avoided.

In the embodiment of the present invention, the water stop plate 601 is installed horizontally and has a ring shape extending in the radial direction of the inner tub 1. The inner circumference of the ring-shaped water stop plate 601 is connected to the upper ends of the filter comb teeth 600, and the outer circumference is connected to the inner circumference of the inner tub 1, so that the entire upper part of the ring-shaped water passage space 602 is blocked by the water stop plate 601. This effectively prevents the drain water flowing into the water passage space 602 from overflowing from the top and eventually splashing out of the inner tub, effectively ensuring the smoothness of the drain water flow of the washing machine.

In an embodiment of the present invention, as shown in FIG. 6, a plurality of drain ports 7 are distributed on the side wall 102 of the inner tank 1 at the upper end of the inner tank 1. The inner tank 1 is rotatably fitted into the outer tank 31, which constitutes the inner tank support member 3. In addition, each drain port 7 connects the inside of the inner tank 1 to the outer tank 31 outside the inner tank 1. Therefore, the cleaning water flowing out from the drain ports 7 of the inner tank 1 is collected in the outer tank 31, and can then be discharged to the outside from a drain pipe connected to the bottom of the outer tank 31. Preferably, an outer tank lid 12 that appropriately opens and closes the tank port of the outer tank 31 is installed on the outer tank 31 to prevent the cleaning water from splashing to the outside.

Alternatively, multiple drainage ports 7 are distributed at the upper end of the inner tank 1, and a water collection tank 32 is provided below the inner tank 1. In addition, a flow path 9 extending vertically downward is provided on the side wall 102 of the inner tank. The upper ends of the flow paths 9 are connected to the drainage ports 7 in a one-to-one correspondence, and the lower ends of the flow paths 9 all extend into the water collection tank 32. The drainage ports 7 connect the inside of the inner tank 1 to the flow path 9 outside the inner tank 1, and are used to discharge water that has risen to the tank mouth 101 of the inner tank due to centrifugal force from the drainage ports 7 to the flow path 9, guide it through the flow path 9, and then flow into the water collection tank 32 outside the inner tank 1. Preferably, the water collection tank 32 and the inner tank 1 are installed coaxially. In addition, the radial size of the opening of the water collection tank 32 is larger than the radial size of the inner tank 1. More preferably, at least the lower end of the inner tank 1 extends into the water collection tank 32, and a gap is maintained between the outer wall of the inner tank 1 and the inner wall of the water collection tank 32. This allows all wastewater to flow into the water collection tank 32 while ensuring rotation of the inner tank (not shown in the figure).

The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any form. Although the present invention has been disclosed above through a preferred embodiment, it is not intended to limit the present invention. Within the scope of the technical solution of the present invention, slight modifications or additions that can be implemented by a person skilled in the art using the technical content presented above are equivalent embodiments that have been modified in an equivalent manner, and none of them deviate from the content of the technical solution of the present invention. In addition, any simple modifications, equivalent modifications, and additions made to the above embodiments based on the technical essence of the present invention all fall within the scope of the solution of the present invention.

REFERENCE SIGNS LIST 1 Inner tub 2 Housing 3 Inner tub support member 4 Door 5 Drive motor 6 Lint filter 7 Drain port 8 Centrifugal valve 9 Flow path 10 Pulsator 11 Balance ring 12 Outer tub cover 31 Outer tub 32 Water collection tub 60 Filter chamber 61 Dirt discharge hole 62 Counterweight 64 Valve plug 65 Holder 66 Return spring 600 Filter comb teeth 601 Water stop plate 602 Water passage space 604 Filter section 605 Collection section 606 Collection tub 70 Casing 71 Water inlet 72 Water outlet 73 Filter structure 74 Valve body 711 First opening 712 Second opening 101 Inner tub mouth 102 Inner tub side wall 103 Inner tub bottom

Claims (19)

A washing machine comprising an inner tub constituting a rotatable water storage tank, the inner tub being provided with a lint filter,
The inner tub is provided with a drain outlet, and a ring-shaped lint filter is provided at the drain outlet.
The annular lint filter is divided into an upper collecting section and a lower filtering section;
The collecting section and the filtering section have tapered shapes with different taper degrees, and the taper degree a2 of the collecting section is larger than the taper degree a1 of the filtering section, or the collecting section has a cylindrical shape and the filtering section has a tapered shape. The washing machine according to claim 1, characterized in that the lint filter has a filter chamber inside, the lint filter is provided with a water inlet and a water outlet that connect the filter chamber to the inside of the inner tub, the water inlet and the water outlet are each provided with a check valve that controls the flow direction of the water flow, and the filter chamber, the water outlet, the check valve, or a combination thereof is provided with a filtering structure that filters lint in the water flow passing through. The inner tank is provided with a dirt discharge hole, the inner tank is fitted into the outer tank, and the dirt discharge hole communicates with the filtration chamber and the outer tank,
Alternatively, the washing machine according to claim 2, characterized in that a dirt discharge hole is provided in the inner tub, a water collection tank is provided below the inner tub, a flow path extending vertically downward is provided in a side wall of the inner tub, a lower end of the flow path extends into the water collection tank, and the dirt discharge hole connects the filtration chamber and the flow path. 4. The washing machine according to claim 3, wherein the filtering chamber of the lint filter is provided with a valve for controlling opening and closing of the dirt discharge hole. The washing machine according to any one of claims 1 to 4, characterized in that the inner tub has a tub-like structure with a vertical axis and an open upper end, the lint filter is installed in the middle of the side wall of the inner tub, and the side wall of the inner tub is tapered so that the radial size at the upper end is large and the radial size at the lower end is small. The washing machine according to claim 5, characterized in that a plurality of the lint filters are distributed on the side wall of the inner tub, and each of the lint filters is distributed symmetrically at intervals with respect to the axis of the inner tub. The washing machine according to claim 5, characterized in that the inner tub has multiple wash water levels, and at least a portion of the lint filter is higher than the minimum wash water level in the inner tub and at least a portion of the lint filter is lower than the maximum wash water level in the inner tub. A plurality of drain holes are distributed at the upper end of the inner tank, the inner tank is rotatably fitted into the outer tank, and each drain hole communicates with the inner tank and the outer tank,
Alternatively, the washing machine according to claim 5, characterized in that a drain outlet is provided at an upper end of the inner tub, a water collection tank is provided below the inner tub, and a flow path extending vertically downward is provided on a side wall of the inner tub, the upper end of the flow path being connected to the drain outlet and the lower end extending into the water collection tank. The centrifugal valve is
a valve core that is movably adapted to seal or open the dirt discharge hole;
a centrifugal device connected to the valve core, which pulls the valve core by centrifugal force when the inner tub rotates at high speed to open the dirt discharge hole;
5. The washing machine according to claim 4, further comprising an elastic member connected to the valve core for moving the valve core against centrifugal force when the inner tub rotates at a low speed to close the dirt discharge hole. The washing machine according to claim 5, characterized in that the lint filter includes a casing, the casing is engaged with and attached to the inside of the side wall of the inner tub, the casing and the inner tub surround a filtration chamber, the casing of the lint filter has a first opening and a second opening on both sides facing each other in the rotation direction of the inner tub, the first opening and the second opening each have a valve body that can rotate around an axis, the rotation axis of the valve body is parallel to the axis of the inner tub, the valve body rotates toward the inside of the casing when struck by a water flow and can open the opening, and cannot rotate outside the casing because it is positioned by the casing, a water outlet is provided on the side of the casing facing the inside of the inner tub and/or on the upper and lower sides, and the water outlet is provided with a lattice structure that filters lint from the outflowing water flow. 2. The washing machine according to claim 1 , wherein the annular lint filter has one or a combination of a lattice structure, a mesh structure, and a comb-tooth structure that covers the drain outlet. 2. The washing machine according to claim 1 , wherein the annular lint filter is an integral part of the inner tub, or the annular lint filter is an independent part fixedly attached to the inner tub. The washing machine according to claim 1 or 12, characterized in that the annular lint filter is provided on the inner circumference of the side wall of the inner tub to form an annular structure covering the drain outlet, the annular lint filter and the inner wall of the inner tub together surround a water passage space, the water passage space communicates with the outside of the inner tub through the drain outlet, and the water passage space communicates with the inside of the inner tub through the filtering gaps of the annular lint filter. The washing machine according to claim 13, characterized in that the inner tub has a tub-like structure with a vertical axis and an open upper end, the side wall of the inner tub has a tapered shape with a larger radial size at the upper end and a smaller radial size at the lower end , at least one drain hole is provided in a ceiling portion of the side wall of the inner tub, and the annular lint filter is provided on the inner peripheral side of the ceiling portion of the inner tub. The annular lint filter includes a plurality of filtering comb teeth distributed at intervals along the circumferential direction of the inner tub, and gaps between adjacent filtering comb teeth form filtering gaps through which water flows, and a width d of the filtering gaps is smaller than a hole diameter D of the drain outlet ,
The washing machine according to claim 14, wherein the filtering comb teeth have a sheet-like structure, and an included angle between the sheet-like filtering comb teeth and a radial cross section of the inner tub is a, and a is equal to or greater than 0 and less than 90 . 16. The washing machine according to claim 15 , wherein the annular lint filter is tapered so as to gradually shrink from bottom to top. The washing machine according to claim 16 , wherein the filtering section is provided with a collection tub recessed toward the inside of the water passage space and opening toward the inside of the inner tub. The washing machine according to claim 16 , wherein a lower end of each of the filter comb teeth is connected to the inner wall of the inner tub, and an upper end of each of the filter comb teeth is connected to the inner wall of the inner tub via a water blocking plate. The washing machine according to claim 18, characterized in that the water stop plate is installed horizontally and has an annular shape extending in a radial direction of the inner tub, the annular water stop plate having an inner periphery connected to upper ends of each of the filtering comb teeth and an outer periphery connected to the inner periphery of the inner tub.