CN111501298B

CN111501298B - Washing machine and control method thereof

Info

Publication number: CN111501298B
Application number: CN202010321058.1A
Authority: CN
Inventors: 石小超; 王其建; 湛国庆
Original assignee: Hisense Shandong Refrigerator Co Ltd
Current assignee: Hisense Shandong Refrigerator Co Ltd
Priority date: 2020-04-23
Filing date: 2020-04-23
Publication date: 2022-05-27
Anticipated expiration: 2040-04-23
Also published as: CN111501298A

Abstract

The invention provides a washing machine and a control method thereof, relates to the technical field of washing machines, and aims to solve the problem that a drainage pump of the washing machine in the related art is prone to failure. The washing machine includes: a box body; the bottom of the washing cylinder is provided with a water outlet; draining pump; the first drainage pipe extends along the vertical direction, the upper end of the first drainage pipe is communicated with the drainage port, and the lower end of the first drainage pipe is communicated with the water inlet of the drainage pump; a connecting port is formed in the side wall of the first drainage pipe; one end of the second drain pipe is communicated with the connecting port, and the other end of the second drain pipe is communicated with the water inlet of the drainage pump; the filter is arranged in the first drainage pipe and is positioned below the connecting port; the valve is arranged between the filter and the connecting port; and the controller is used for controlling the valve to open the first drainage pipe when the metal detector detects that metal foreign matters exist in the first drainage pipe above the connecting port. The invention can be used for washing clothes.

Description

Washing machine and control method thereof

Technical Field

The invention relates to the technical field of washing machines, in particular to a washing machine and a control method thereof.

Background

Washing machines are cleaning appliances which utilize electric energy to generate mechanical action to wash clothes, more and more people use washing machines to wash clothes, bedding and other large articles, time and labor are saved, and the washing machines are becoming essential household appliances in people's life.

One of the related art is to drain water through the drain pump, but when the washing machine drains water, metal foreign matters in the washing drum, such as zippers, coins, etc., are likely to enter the impeller cavity of the drain pump along with water flow, and after a long time, the accumulated metal foreign matters are likely to damage the impeller, thereby causing a drainage failure of the washing machine.

Disclosure of Invention

Embodiments of the present invention provide a washing machine and a control method thereof to solve a problem that a drain pump of the washing machine in the related art is prone to malfunction.

To achieve the above object, according to a first aspect, an embodiment of the present invention provides a washing machine, including: a box body; the washing drum is arranged in the box body, and a water outlet is formed in the bottom of the washing drum; draining pump; the first drainage pipe extends along the vertical direction, the upper end of the first drainage pipe is communicated with the drainage port, and the lower end of the first drainage pipe is communicated with the water inlet of the drainage pump; a connecting port is formed in the side wall of the first drainage pipe; one end of the second drain pipe is communicated with the connecting port, and the other end of the second drain pipe is communicated with the water inlet of the drainage pump; the filter is arranged in the first drainage pipe and is positioned below the connecting port; the valve is arranged between the filter and the connecting port and is used for opening or closing the first drainage pipe; the metal detector is used for detecting whether metal foreign matters exist in the first drainage pipe above the connecting port; a controller to: when the metal detector detects that metal foreign matters exist in a first drainage pipe positioned above the connecting port, the valve is controlled to open the first drainage pipe; and when the metal detector does not detect that metal foreign matters exist in the first drainage pipe above the connecting port, controlling the valve to close the first drainage pipe.

In a second aspect, an embodiment of the present invention provides a control method of a washing machine, wherein the washing machine includes: a box body; the washing drum is arranged in the box body, and a water outlet is formed in the bottom of the washing drum; draining pump; the first drainage pipe extends along the vertical direction, the upper end of the first drainage pipe is communicated with the drainage port, and the lower end of the first drainage pipe is communicated with the water inlet of the drainage pump; a connecting port is formed in the side wall of the first drainage pipe; one end of the second drain pipe is communicated with the connecting port, and the other end of the second drain pipe is communicated with the water inlet of the drainage pump; the filter is arranged in the first drainage pipe and is positioned below the connecting port; the valve is arranged between the filter and the connecting port and is used for opening or closing the first drainage pipe; the method comprises the following steps: detecting whether metal foreign matters exist in a first drainage pipe above the connecting port; when detecting that metal foreign matters exist in a first drainage pipe positioned above the connecting port, controlling the valve to open the first drainage pipe; and when metal foreign matters are not detected in the first drainage pipe above the connecting port, controlling the valve to close the first drainage pipe.

According to the washing machine and the control method thereof provided by the embodiment of the invention, by arranging the metal detector and the controller, when water is drained, if metal foreign matters in the washing cylinder enter the first drain pipe positioned above the connecting port from the drain port, the metal foreign matters can be detected by the metal detector, and at the moment, the controller can control the valve to open the first drain pipe; if the metal detector does not detect that there is the metallic foreign object in the first drain pipe that is located the connector top, the controller just can control valve and close first drain pipe, and rivers just can enter into the second drain pipe through the connector on the first drain pipe this moment, then discharge through the drain pump, just so can avoid being located the influence that the foreign object of filter upside caused to the flow of rivers to rivers smoothly discharge when can guaranteeing the drainage.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural view of a washing machine according to an embodiment of the present invention;

FIG. 2 is a schematic view of a drain system of a washing machine in an embodiment of the present invention;

FIG. 3 is a longitudinal sectional view of a drain system of a washing machine in an embodiment of the present invention;

fig. 4 is a transverse sectional view at a filter of the washing machine in the embodiment of the present invention;

FIG. 5 is a schematic view of a valve in an embodiment of the present invention in a closed state;

FIG. 6 is a schematic view of an embodiment of the present invention with the valve in an open position;

FIG. 7 is a schematic view of a control system of a washing machine in an embodiment of the present invention;

FIG. 8 is a first flowchart illustrating the control of the washing machine according to the embodiment of the present invention;

fig. 9 is a second control flowchart of the washing machine according to the embodiment of the present invention.

Reference numerals: a box body 1; a washing drum 2; an outer cylinder 21; an inner cylinder 22; a drain opening 20; a drain pump 3; a first drain pipe 4; a connection port 41; a first tube section 42; a second tube section 43; a third tube segment 44; a second drain pipe 5; a filter 6; a filter screen 61; mesh 611; a valve 7; a valve plate 71; a rotating shaft 72; a motor 73; a mounting shaft 74; a spring 75; a metal detector 81; a controller 82; a weight detector 83; an alert device 84.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; the term "coupled" may refer to a direct connection, an indirect connection through intervening media, or a connection between two elements; the specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In a first aspect, an embodiment of the present invention provides a washing machine, as shown in fig. 1 and 2, including: a box body 1; the washing drum 2 is arranged in the box body 1, and a water outlet 20 is formed in the bottom of the washing drum 2; a drain pump 3; a first drain pipe 4, wherein the first drain pipe 4 extends along the vertical direction, the upper end of the first drain pipe is communicated with the drain port 20, and the lower end of the first drain pipe is communicated with the water inlet of the drain pump 3; a connecting port 41 is formed on the pipe side wall of the first drainage pipe 4; and one end of the second water discharge pipe 5 is communicated with the connecting port 41, and the other end of the second water discharge pipe 5 is communicated with the water inlet of the drainage pump 3.

The lower end of the first drain pipe 4 may be directly connected to the water inlet of the drain pump 3, or indirectly connected to the water inlet of the drain pump 3, for example, as shown in fig. 3, the lower end may be connected to the second drain pipe 5 through a connection pipe a.

As shown in fig. 3, the washing machine further includes: a filter 6, wherein the filter 6 is arranged in the first drain pipe 4 and is positioned below the connecting port 41; a valve 7, the valve 7 being disposed between the filter 6 and the connection port 41, and being used to open or close the first drain pipe 4; a metal detector 81, wherein the metal detector 81 is used for detecting whether metal foreign matters exist in the first drain pipe 4 positioned above the connecting port 41.

As shown in fig. 7, the washing machine further includes: a controller 82 (such as a computer board), wherein the controller 82 is used for controlling the valve 7 to open the first drain pipe 4 (as shown in fig. 6) when the metal detector 81 detects that metal foreign matters exist in the first drain pipe 4 positioned above the connecting port 41; when the metal detector 81 does not detect the presence of metal foreign matter in the first drain pipe 4 located above the connection port 41, the control valve 7 closes the first drain pipe 4 (as shown in fig. 5).

As shown in fig. 3 and 7, by providing the metal detector 81 and the controller 82, when water is drained, if a metal foreign object in the washing drum 2 enters the first drain pipe 4 located above the connection port 41 from the drain port 20, the metal foreign object can be detected by the metal detector 81, and at this time, the controller 82 can control the valve 7 to open the first drain pipe 4 (as shown in fig. 6), and since the first drain pipe 4 extends in the vertical direction, the metal foreign object can fall to the upper side of the filter 6 under the action of gravity, so that the metal foreign object can be prevented from entering the impeller cavity of the drain pump 3 along with the water flow, and thus the damage of the impeller caused by the metal foreign object can be avoided, the service life of the drain pump 3 is prolonged, and the normal operation of the drain system is ensured; if the metal detector 81 does not detect that there is a metal foreign object in the first drain pipe 4 above the connection port 41, the controller 82 may control the valve 7 to close the first drain pipe 4 (as shown in fig. 5), and at this time, the water flow may enter the second drain pipe 5 through the connection port 41 of the first drain pipe 4 and then be discharged through the drain pump 3, so that the influence of the foreign object (including the metal foreign object) on the upper side of the filter 6 on the flow of the water flow may be avoided, and the smooth discharge of the water flow during the draining may be ensured.

It should be noted that: the washing machine may be a drum type washing machine (as shown in fig. 1 and 2), or a pulsator type washing machine, and is not particularly limited herein; when the washing machine is a drum-type washing machine, as shown in fig. 2, the washing drum 2 comprises an outer drum 21 and an inner drum 22 positioned in the outer drum 21, when the washing machine is normally used, various clothes are loaded into the inner drum 22, then water firstly enters the outer drum 21, as the wall of the inner drum 22 is provided with water inlet holes, the water enters the inner drum 22 through the water inlet holes on the inner drum 22, then the clothes are wetted, the inner drum 22 is driven to rotate forward and backward by a motor, so that the clothes are washed clean, and when coins exist in a clothes pocket or an outer sleeve zipper head is broken, at the moment, in the washing process, metal foreign matters such as the coins or the zipper head and the like can enter a gap between the inner drum 22 and the outer drum 21 and then enter the first drain pipe 4 together with water flow through the drain outlet 20.

As shown in fig. 3, in the draining process, if the metal foreign object is in the sensing area of the metal detector 81, the metal detector 81 can detect the metal foreign object, and if the metal foreign object is not in the sensing area of the metal detector 81, the metal detector 81 cannot detect the metal foreign object, because the sensing area of the metal detector 81 is limited, when the sensing area of the metal detector 81 is far away from the valve 7, in order to avoid the valve 7 being closed too early when the metal foreign object moves to the non-sensing area between the sensing area of the metal detector 81 and the valve 7, as shown in fig. 3 and 7, the controller 82 is configured to: when the time for opening the first drain pipe 4 by the valve 7 reaches a preset value (for example, 10s) and the metal detector 81 does not detect that there is a metal foreign object in the first drain pipe 4 located above the connection port 41, the valve 7 is controlled to close the first drain pipe 4 (as shown in fig. 5). Because the controller 82 controls the valve 7 to close the first drain pipe 4 when the time for opening the first drain pipe 4 by the valve 7 reaches the preset value, the metal foreign matters can be guaranteed to have enough time to fall on the upper side of the filter 6 through the valve 7 before the valve 7 is closed, and the situation that a part of the metal foreign matters cannot fall to the upper side of the filter 6 through the valve 7 due to the fact that the valve 7 is closed too early is avoided.

The signal interaction between the metal detector 81 and the controller 82 is as follows: when the metal detector 81 detects that metal foreign matters exist in the first drain pipe 4 positioned above the connecting port 41, the metal detector 81 sends a first electric signal to the controller 82, and after receiving the first electric signal, the controller 82 sends a first execution signal to the valve 7 to enable the valve 7 to open the first drain pipe 4; when the time after the controller 82 receives the first electric signal reaches a preset value and the controller 82 does not receive the first electric signal sent again by the metal detector 81 during the time, the controller 82 sends a second execution signal to the valve 7 to enable the valve 7 to close the first drain pipe 4.

In order to allow the metal detector 81 to accurately detect the metal foreign matter in the first drain pipe 4, as shown in fig. 3, the metal detector 81 is formed in a cylindrical shape and is fitted to the first drain pipe 4 above the connection port 41. Be the tube-shape through setting up metal detector 81, metal detector 81 just can surround first drain pipe 4 like this to carry out comprehensive detection to the region in first drain pipe 4, thereby improved the accuracy that metal detector 81 detected, greatly reduced metal foreign matter is by the probability of missed measure.

In order to facilitate the user to clean the foreign matter on the upper side of the filter 6 in time, as shown in fig. 3 and 7, the washing machine further includes: a weight detector 83, the weight detector 83 being configured to acquire a weight value of the foreign matter located on the upper side of the filter 6; a warning device 84, the warning device 84 having a warning state; the controller 82 is configured to: when the weight value reaches the preset weight value, the warning device 84 is controlled to switch to a warning state. Through the setting, when the foreign matter (including the metallic foreign matter) of filter 6 upside piles up the certain degree like this, when the weight value that is exactly the foreign matter that is located filter 6's upside reaches preset weight value, controller 82 just can control warning device 84 and switch to the warning state to remind the user, the user just so can in time clear up the foreign matter of filter 6 upside, in order to avoid the foreign matter to pile up too much.

Wherein, the signal interaction of the weight detector 83, the controller 82 and the warning device 84 can be as follows; when the weight value reaches the preset weight value, the weight detector 83 sends a second electric signal to the controller 82, and after receiving the second electric signal, the controller 82 sends a third execution signal to the warning device 84, so that the warning device 84 is in a warning state. The warning device 84 may be a warning light, a buzzer, or the like, wherein when the warning light is in a warning state, the warning light reminds the user by lighting or flashing, and when the buzzer is in the warning state, the buzzer reminds the user by sounding.

In the washing machine according to the embodiment of the present invention, as shown in fig. 3, the filter 6 may include a filter net 61, the filter net 61 is disposed in the first drain pipe 4 below the connection port 41, and a periphery of the filter net 61 is connected to a pipe side wall of the first drain pipe 4.

In the washing machine according to the embodiment of the present invention, the weight detector 83 may be a gravity sensor or a strain gauge sensor, and is not limited in detail herein. As shown in fig. 3 and 4, when the weight detector 83 is a strain sensor, the strain sensor may be disposed at the periphery of the filter screen 61, the foreign matter accumulated on the upper side of the filter screen 61 may cause a certain pressure on the filter screen 61, the filter screen 61 may generate a certain deformation under the action of the pressure, and the strain sensor obtains the weight of the foreign matter on the upper side of the filter screen 61 by obtaining the deformation amount at the periphery of the filter screen 61;

in addition, the strain gauge sensor may cover the lower surface of the filter screen 61, and the strain gauge sensor may be provided with filter holes corresponding to the meshes 611 of the filter screen 61, and obtain the weight of the foreign matter on the upper side of the filter screen 61 by obtaining the entire deformation amount of the filter screen 61.

As shown in fig. 4, the diameter of the meshes 611 of the filter screen 61 is an important parameter, which should not be too large, and should not be too small, if the diameter of the meshes 611 of the filter screen 61 is too large, then the small metal foreign matters can easily enter the drain pump 3 through the filter screen 61, if the diameter of the filter screen 61 is too small, then the water flow passes through the filter screen 61 with a large resistance, which affects the smoothness of the water flow, and it is found through research that, when the diameter of the meshes 611 of the filter screen 61 is 3-5 mm, the metal foreign matters can be filtered well, and the water flow can be prevented from causing a large resistance, thereby ensuring that the water flow smoothly passes through the filter screen 61.

In order to clean foreign matters on the upper side of the filter 6, as shown in fig. 3, the first drain pipe 4 includes: a first pipe section 42, wherein the upper end of the first pipe section 42 is communicated with the water outlet 20, and the connecting port 41 is arranged on the pipe side wall of the first pipe section 42; a second pipe section 43, a lower end of the second pipe section 43 being communicated with a water inlet of the drain pump 3, and a filter 6 being provided in the second pipe section 43; a third pipe section 44, the upper end of the third pipe section 44 being detachably connected to the lower end of the first pipe section 42, and the lower end of the third pipe section 44 being detachably connected to the upper end of the second pipe section 43. Since the third pipe segment 44 is detachably connected to both the first pipe segment 42 and the second pipe segment 43, when a user needs to clean the foreign objects, for example, when the warning device 84 is in a warning state, the user can detach the third pipe segment 44, and at this time, the user can very conveniently clean the foreign objects located in the second pipe segment 43 and on the upper side of the filter 6.

The third pipe section 44 can be detachably connected to the first pipe section 42 and the second pipe section 43, for example, by a threaded connection, as shown in fig. 3, an upper end of the third pipe section 44 is threadedly connected to a lower end of the first pipe section 42, and a lower end of the third pipe section 44 is threadedly connected to an upper end of the second pipe section 43. Alternatively, the third pipe segment 44 may be removably connected to the first and

second pipe segments

42, 43 by a connector (e.g., a clamp). Compared with the mode of connection through a connecting piece, the mode of threaded connection is adopted, so that the connection structure of the third pipe section 44, the first pipe section 42 and the second pipe section 43 is simpler, and other parts do not need to be added.

In order to reduce the obstruction of the valve 7 to metal foreign matter when in the open state, as shown in fig. 3, the valve 7 includes: the valve plate 71 is arranged in the first drainage pipe 4 and is positioned between the filter 6 and the connecting port 41, the valve plate 71 is rotatably connected with the first drainage pipe 4 through a rotating shaft 72, and the rotating shaft 72 is horizontally arranged; and the motor 73 is used for driving the valve plate 71 to rotate around the rotating shaft 72, as shown in fig. 5, when the valve plate 71 is in a horizontal state, the first drainage pipe 4 is closed, and as shown in fig. 6, when the valve plate 71 is in a vertical state, the first drainage pipe 4 is opened. Because the valve plate 71 is through revolving around the rotation axis 72 upset to open or close first drain pipe 4, and when the valve plate 71 was in vertical state, open first drain pipe 4, like this when the open mode, can reduce the occupation of valve plate 71 to the cross section of first drain pipe 4, not only can make the flow of valve 7 bigger, valve plate 71 is difficult to cause the hindrance to the metallic foreign matter moreover.

In a second aspect, an embodiment of the present invention provides a control method of a washing machine, wherein, as shown in fig. 1 and 3, the washing machine includes: a box body 1; the washing drum 2 is arranged in the box body 1, and a water outlet 20 is formed in the bottom of the washing drum 2; a drain pump 3; a first drain pipe 4, wherein the first drain pipe 4 extends along the vertical direction, the upper end of the first drain pipe is communicated with the drain port 20, and the lower end of the first drain pipe is communicated with the water inlet of the drain pump 3; a connecting port 41 is formed on the pipe side wall of the first drainage pipe 4; a second water discharge pipe 5, one end of the second water discharge pipe 5 is communicated with the connection port 41, and the other end is communicated with the water inlet of the water discharge pump 3; a filter 6, wherein the filter 6 is arranged in the first drain pipe 4 and is positioned below the connecting port 41; a valve 7, the valve 7 being disposed between the filter 6 and the connection port 41, and being used to open or close the first drain pipe 4;

as shown in fig. 3 and 8, the control method of the washing machine includes the steps of:

s1, detecting whether metal foreign matters exist in the first drain pipe 4 positioned above the connecting port 41;

the main body for executing step S1 may be the metal detector 81, or may be a device including the metal detector 81, which is not specifically limited herein;

s2, when detecting that metal foreign matters exist in the first drain pipe 4 positioned above the connecting port 41, controlling the valve 7 to open the first drain pipe 4; when the presence of metallic foreign matter in the first drain pipe 4 located above the connection port 41 is not detected, the control valve 7 closes the first drain pipe 4.

The main body for executing step S2 may be the controller 82, or may be a device including the controller 82, which is not limited in this embodiment.

Technical problems to be solved and technical effects to be achieved by the control method of the washing machine according to the embodiment of the present invention are the same as the technical problems to be solved and the technical effects to be achieved by the washing machine in the first aspect, and are not described herein again.

In step S2, when the presence of the metallic foreign matter in the first drain pipe 4 located above the connection port 41 is not detected, the control valve 7 closes the first drain pipe 4, including: when the time that the valve 7 opens the first drain pipe 4 reaches a preset value and the presence of metal foreign matter in the first drain pipe 4 located above the connecting port 41 is not detected, the valve 7 is controlled to close the first drain pipe 4. Because the valve 7 is controlled to close the first drain pipe 4 when the time that the valve 7 opens the first drain pipe 4 reaches the preset value, the metal foreign matters can be guaranteed to have enough time to fall on the upper side of the filter 6 through the valve 7 before the valve 7 is closed, and the situation that a part of the metal foreign matters cannot fall to the upper side of the filter 6 through the valve 7 due to the fact that the valve 7 is closed too early is avoided.

In case that the washing machine further includes the warning device 84, in order to facilitate a user to clean foreign matters on an upper side of the filter 6 in time, the control method of the washing machine further includes the steps of: as shown in fig. 7 and 9;

s3, acquiring the weight value of the foreign matters on the upper side of the filter 6;

the main body of step S3 may be a gravity sensor or a strain gauge sensor, and is not limited in this respect.

And S4, controlling the warning device 84 to switch to a warning state when the weight value reaches a preset weight value.

The main body for executing step S4 may be the controller 82, or may be a device including the controller 82, and is not particularly limited herein.

Through steps S3 and S4, when the foreign matter (including metal foreign matter) on the upper side of the filter 6 is accumulated to a certain extent, the warning device 84 can be controlled to switch to a warning state to remind the user, so that the user can clean the foreign matter on the upper side of the filter 6 in time to avoid the accumulation of the foreign matter.

The same or similar features in the embodiment of the control method of the washing machine as those in the embodiment of the product of the washing machine may be referred to the description of the embodiment of the product of the washing machine, and are not repeated herein.

In the description herein, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims

1. A washing machine, characterized by comprising:

a box body;

the washing drum is arranged in the box body, and a water outlet is formed in the bottom of the washing drum;

draining pump;

the first drainage pipe extends along the vertical direction, the upper end of the first drainage pipe is communicated with the drainage port, and the lower end of the first drainage pipe is communicated with the water inlet of the drainage pump; a connecting port is formed in the side wall of the first drainage pipe;

one end of the second drain pipe is communicated with the connecting port, and the other end of the second drain pipe is communicated with the water inlet of the drainage pump;

the filter is arranged in the first drainage pipe and is positioned below the connecting port;

the valve is arranged between the filter and the connecting port and is used for opening or closing the first drainage pipe;

the metal detector is used for detecting whether metal foreign matters exist in the first drainage pipe above the connecting port;

a controller to: when the metal detector detects that metal foreign matters exist in a first drainage pipe above the connecting port, the valve is controlled to open the first drainage pipe; and when the metal detector does not detect that metal foreign matters exist in the first drainage pipe above the connecting port, controlling the valve to close the first drainage pipe.

2. The washing machine as claimed in claim 1,

the controller is configured to: and when the time for opening the first drainage pipe by the valve reaches a preset value and the metal detector does not detect that metal foreign matters exist in the first drainage pipe above the connecting port, controlling the valve to close the first drainage pipe.

3. The washing machine as claimed in claim 1, wherein the metal detector is cylindrical and is sleeved on the first drain pipe above the connection port.

4. The washing machine as claimed in claim 1, further comprising:

a weight detector for acquiring a weight value of foreign matter located at an upper side of the filter;

the warning device is provided with a warning state;

the controller is configured to: when the weight value reaches a preset weight value, the warning device is controlled to be switched to the warning state.

5. The washing machine as claimed in claim 4, wherein the filter includes a filter net disposed in the first drain pipe below the connection port, a periphery of the filter net being connected to a pipe side wall of the first drain pipe;

the weight detector is a strain type sensor, and the strain type sensor is arranged at the periphery of the filter screen.

6. A washing machine as claimed in claim 5, wherein the diameter of the meshes of the filter net is in the range of 3 to 5 mm.

7. A washing machine according to any one of claims 1 to 6,

the valve comprises:

the valve block is arranged in the first drainage pipe and positioned between the filter and the connecting port, the valve block is rotatably connected with the first drainage pipe through a rotating shaft, and the rotating shaft is horizontally arranged;

the motor, the motor is used for the drive the valve block winds the pivot rotates, and works as when the valve block is in the horizontality, closes first calandria, works as when the valve block is in vertical state, open first calandria.

8. A washing machine according to any one of claims 1 to 6,

the first drain pipe includes:

the upper end of the first pipe section is communicated with the water outlet, and the connecting port is formed in the pipe side wall of the first pipe section;

a second pipe section, the lower end of which is communicated with the water inlet of the drainage pump, wherein the filter is arranged in the second pipe section;

the upper end of the third pipe section is detachably connected with the lower end of the first pipe section, and the lower end of the third pipe section is detachably connected with the upper end of the second pipe section.

9. The washing machine as claimed in claim 8, wherein an upper end of the third pipe section is screw-coupled to a lower end of the first pipe section, and a lower end of the third pipe section is screw-coupled to an upper end of the second pipe section.

10. A control method of a washing machine, wherein the washing machine comprises:

a box body;

the washing cylinder is arranged in the box body, and the bottom of the washing cylinder is provided with a water outlet;

draining pump;

the method is characterized by comprising the following steps:

detecting whether metal foreign matters exist in a first drainage pipe above the connecting port;

when detecting that metal foreign matters exist in a first drainage pipe positioned above the connecting port, controlling the valve to open the first drainage pipe; and when metal foreign matters are not detected in the first drainage pipe above the connecting port, controlling the valve to close the first drainage pipe.

11. The control method of a washing machine according to claim 10, wherein controlling the valve to close the first drain pipe when the presence of the metallic foreign matter in the first drain pipe located above the connection port is not detected includes:

and when the time for opening the first drainage pipe by the valve reaches a preset value and metal foreign matters are not detected in the first drainage pipe above the connecting port, controlling the valve to close the first drainage pipe.

12. The control method of a washing machine according to claim 10 or 11, wherein the washing machine further comprises a warning device having a warning state;

further comprising the steps of:

acquiring a weight value of foreign matter located at an upper side of the filter;

when the weight value reaches a preset weight value, the warning device is controlled to be switched to the warning state.