Washing and drying integrated machine and control method thereof

Abstract

The application relates to a washing and drying integrated machine and a control method thereof. The washing and drying integrated machine comprises an evaporator, a condenser and a washing barrel; an air inlet channel for drying is arranged between the condenser and the washing barrel, an air outlet channel for drying is arranged between the washing barrel and the evaporator; a filter screen is arranged at the end of the air outlet channel for drying, and a water film eliminating channel is further arranged; the front end of the water film eliminating channel is communicated with the air inlet channel for drying, the rear end is arranged on one side of the filter screen, and the air outlet direction is towards the filter screen. The scheme can quickly eliminate the water film on the filter screen after the filter screen is cleaned by using water flow, effectively circulate the air inlet channel for drying and the air outlet channel for drying during drying, improve the drying efficiency of the washing and drying integrated machine, reduce energy consumption, effectively guarantee the use performance of the washing and drying integrated machine, and improve the use experience of users.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of washer-dryer, in particular to a washer-dryer and a control method thereof. BACKGROUND

[0002] The washer-dryer is a new intelligent washing machine which integrates washing, spinning and drying functions in one machine based on the full-automatic washing machine.

[0003] With the continuous improvement of people's living standards, in the fast-paced life, people wash clothes by using the washing function of the washer-dryer, and directly dry the clothes after washing, so as to achieve the purpose of quickly using the clothes. The drying system of the washer-dryer on the market is mainly divided into two types, one is heat pump type, and the other is electric heating type. In the structure of the heat pump type washer-dryer, a filter screen is arranged at the ventilation hole between the drum and the evaporator. When the hot air blows to the clothes in the drum during the running of the drying program, part of the lint on the clothes will be mixed in the air and then discharged in front of the evaporator. The lint in the air can be filtered out through the filter screen, so as to ensure the cleanliness of the evaporator, the condenser and the air duct. After running for several drying cycles, the accumulated lint on the filter screen will gradually increase. Too much lint will block the ventilation hole of the filter screen, increase the wind resistance, reduce the drying efficiency, and even cause the washer-dryer to fail.

[0004] In the related art, in order to solve the above problems, the existing technology CN109023838B discloses a control method and device of a washer-dryer cleaning device and a washer-dryer. Specifically, when the filter screen cleaning condition is met, the filter screen is cleaned by the automatic cleaning device. The lint on the filter screen is mainly cleaned by the water flow flushing method. However, since the filter screen is a relatively dense hole structure, a layer of water film will be left on the surface of the filter screen after the water flow passes. At this time, the water molecules are closely attached to the middle of the mesh hole, blocking the mesh hole of the filter screen. If the water film is not eliminated, the water film will block the circulation of the drying air duct, resulting in poor drying efficiency of the washer-dryer, increasing the energy consumption, and reducing the user experience. In addition, after running the washing program for a period of time, many stains and bacteria will accumulate between the inner and outer drums of the washer-dryer, and the drum cleaning program needs to be run in time to ensure the safety and efficiency of washing and drying. However, since the current washer-dryer has no reminding function, the user cannot run the drum cleaning program in time, resulting in a decrease in drying efficiency or the degree of clothes cleaning, and reducing the use performance of the washer-dryer.

[0005] Therefore, there is an urgent need to design a washing and drying integrated machine and a control method thereof, which can quickly eliminate water film after using water flow to clean the filter screen, guarantee the effective circulation of the drying air inlet channel and the drying air outlet channel during drying, improve the drying efficiency of the washing and drying integrated machine, reduce energy consumption, and improve the user experience. SUMMARY

[0006] To overcome the problems in the related art, the present application provides a washing and drying integrated machine and a control method thereof, which can quickly eliminate water film after using water flow to clean the filter screen, guarantee the effective circulation of the drying air inlet channel and the drying air outlet channel during drying, improve the drying efficiency of the washing and drying integrated machine, reduce energy consumption, and improve the user experience.

[0007] The first aspect of the present application provides a washing and drying integrated machine, comprising an evaporator, a condenser, and a washing tub; a drying air inlet channel is arranged between the condenser and the washing tub, and a drying air outlet channel is arranged between the washing tub and the evaporator; a filter screen is arranged at the end of the drying air outlet channel; and a water film elimination channel is further arranged; the front end of the water film elimination channel is in communication with the drying air inlet channel, and the end of the water film elimination channel is arranged on one side of the filter screen and faces the filter screen.

[0008] In an embodiment, the drying air inlet channel comprises a fan volute tongue, and a drying air inlet pipeline is arranged at the air outlet of the fan volute tongue; and the front end of the water film elimination channel is arranged at the air outlet of the fan volute tongue.

[0009] In an embodiment, the cross-sectional area of the water film elimination channel is smaller than the cross-sectional area of the drying air inlet pipeline.

[0010] In an embodiment, the end of the drying air inlet pipeline is provided with a wind speed detection probe.

[0011] In an embodiment, the end of the water film elimination channel is further provided with a first branch channel, a second branch channel, and a third branch channel; and the first branch channel, the second branch channel, and the third branch channel are arranged in sequence along the plane direction of the filter screen.

[0012] In an embodiment, a control valve is arranged at the connection between the water film elimination channel and the fan volute tongue.

[0013] The second aspect of the present application provides a control method of a washing and drying integrated machine, which is based on the above-mentioned washing and drying integrated machine and comprises the following steps:

[0014] determining whether the number of currently running drying programs is greater than or equal to a preset drying number or whether the number of currently running washing programs is greater than or equal to a preset washing number;

[0015] If yes, prompting the user to select a drum cleaning program;

[0016] If no, determining whether the current program is a drying program or a washing program,

[0017] If the current running program is a drying program or a washing program, the corresponding running number is increased by 1.

[0018] In an embodiment, before the determining whether the current program is a drying program or a washing program, the method further comprises:

[0019] Determining whether the user selects a drum cleaning program;

[0020] If yes, running the drum cleaning program, and restoring the drying program running number and the washing program running number to initial preset values.

[0021] In an embodiment, after the running the drum cleaning program, the method further comprises:

[0022] Determining whether the air speed in the drying air inlet pipeline is continuously less than a preset air speed for a period of time;

[0023] If yes, opening the control valve.

[0024] In an embodiment, after the opening the control valve, the method further comprises:

[0025] Determining whether the air speed in the drying air inlet pipeline is continuously greater than or equal to the preset air speed for a period of time;

[0026] If yes, closing the control valve.

[0027] The technical scheme provided by the present application can have the following beneficial effects: when a washing and drying integrated machine runs a drying program, hot air from the condenser enters the washing tub through the drying air inlet channel, and the wet clothes in the washing tub are dried, and then the hot air is discharged to the evaporator through the drying air outlet channel for heat exchange. In this process, the lint in the wet clothes will accumulate on the filter screen along with the hot air. After the filter screen is cleaned with water, water molecules may form a water film on the filter screen. The water film elimination channel connected with the drying air inlet channel blows out hot air, which quickly evaporates the water film through temperature difference and accelerates the rupture of the water film through the generated air force. Compared with the prior art which only provides the drying air inlet channel and the drying air outlet channel, the water film elimination channel of the present scheme can effectively eliminate the water film formed on the filter screen, ensuring the effective circulation of the drying air inlet channel and the drying air outlet channel during drying, further improving the drying efficiency of the washing and drying integrated machine, reducing energy consumption, and improving the user experience.

[0028] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application, as claimed. BRIEF DESCRIPTION OF DRAWINGS

[0029] The above and other objects, features and advantages of the present application will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings in which like reference characters refer to like parts throughout the several views.

[0030] Figure 1 is a structural schematic diagram of a washer-dryer shown in an embodiment of the present application;

[0031] Figure 2 is a flow schematic diagram of a control method of a washer-dryer shown in an embodiment of the present application;

[0032] Figure 3 is another flow schematic diagram of a control method of a washer-dryer shown in an embodiment of the present application.

[0033] REFERENCE NUMERALS:

[0034] 1, evaporator; 2, condenser; 3, washing tub; 4, filter screen; 5, water film elimination passage; 51, first branch passage; 52, second branch passage; 53, third branch passage; 61, fan volute; 62, fan volute tongue; 63, drying air inlet duct; 631, air speed detection probe; 7, control valve; 8, filter screen flushing valve. DETAILED DESCRIPTION

[0035] The preferred embodiments of the present application will be described herein below with reference to the accompanying drawings. While the preferred embodiments of the present application are shown in the drawings, it is understood that the present application can be embodied in many forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the application to those skilled in the art.

[0036] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0037] It should be understood that, although the terms "first", "second", "third", etc. can be used in this application to describe various information, these information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, the first information can also be referred to as the second information, and similarly, the second information can also be referred to as the first information without departing from the scope of the application. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0038] At present, after the lint on the filter screen is cleaned by the water flow, due to the relatively dense hole structure of the filter screen, a layer of water film will be left on the surface of the filter screen after the water flow passes, at this time the water molecules are closely attached to the middle of the mesh, which will block the mesh of the filter screen. If the water film is not eliminated, the water film will block the effective circulation of the drying air duct, resulting in poor drying efficiency of the washer-dryer, which not only increases energy consumption, but also reduces the user's experience.

[0039] In view of the above problems, the embodiments of the present application provide a washer-dryer which can quickly eliminate the water film after using the water flow to clean the filter screen, ensure the effective circulation of the drying air inlet channel and the drying air outlet channel during drying, improve the drying efficiency of the washer-dryer, reduce energy consumption, and improve the user's experience.

[0040] The technical solutions of the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0041] Embodiment one

[0042] Please refer to Figure 1 , Figure 1 is a structural schematic diagram of the washer-dryer shown in the embodiments of the present application.

[0043] The washing and drying integrated machine of the application comprises an evaporator 1, a condenser 2 and a washing barrel 3; the evaporator 1 is arranged adjacent to the condenser 2, a drying air inlet channel is arranged between the condenser 2 and the washing barrel 3, a drying air outlet channel is arranged between the washing barrel 3 and the evaporator 1, the drying air inlet channel and the drying air outlet channel form a drying air duct, so that the hot air from the condenser 2 can enter the washing barrel 3 through the drying air inlet channel, exchange heat with the wet clothes in the washing barrel 3, thereby drying the wet clothes, and then the hot air is discharged to the evaporator 1 through the drying air outlet channel, after sequentially exchanging heat with the evaporator 1 and the condenser 2, the formed hot air enters the washing barrel 3 through the drying air inlet channel again, thereby completing the effective circulation in the drying program; specifically, the drying air inlet channel comprises a fan, the fan comprises a fan volute 61 and a fan volute tongue 62, the fan volute 61 is arranged adjacent to the condenser 2, the fan volute tongue 62 comprises an air outlet, and a drying air inlet pipeline 63 is arranged in communication at the air outlet, that is, the front end of the drying air inlet pipeline 63 is in communication with the air outlet, and the tail end is in communication with the washing barrel 3.

[0044] Since the lint in the wet clothes will circulate to the evaporator 1, the condenser 2 and the drying air duct along with the hot air, in order to ensure the cleanliness of the evaporator 1, the condenser 2 and the drying air duct, a filter screen 4 is arranged at the tail end of the drying air outlet channel; specifically, in order to form the drying air outlet channel by connecting the washing barrel 3 and the evaporator 1, a ventilation hole is arranged between the washing barrel 3 and the evaporator 1, and the filter screen 4 is arranged at the ventilation hole; by the filter screen 4, the clothes can be effectively blocked on the filter screen 4.

[0045] As the drying program continuously runs, the lint on the filter screen 4 continuously increases, and when the lint is relatively more, the mesh holes on the filter screen 4 will be blocked, resulting in increased air resistance, affecting the effective circulation of the hot air, and thereby reducing the drying efficiency; in order to clean the lint on the filter screen 4, a water pipe is further arranged above the filter screen 4, the water outlet direction of the water pipe faces the filter screen 4, and the water pipe is further provided with a filter screen water flushing valve 8; the water flow in the water pipe is controlled by the opening and closing of the filter screen water flushing valve 8, so that the filter screen 4 is washed by the water flow, and the lint on the filter screen 4 is completely removed.

[0046] But because the filter screen 4 is a relatively dense hole shape structure, the water flow will leave a layer of water film on the surface of the filter screen 4 after passing through, at this time the water molecules are closely attached to the middle of the mesh, which will block the mesh of the filter screen 4, affecting the effective circulation of the drying air duct. In order to eliminate the water film, the washing and drying integrated machine further comprises a water film elimination channel 5; the front end of the water film elimination channel 5 is in communication with the drying air inlet channel, and the tail end is arranged on one side of the filter screen 4, and the air outlet direction is towards the filter screen 4; specifically, the front end of the water film elimination channel 5 is arranged at the air outlet of the fan volute tongue 62; when the mesh on the filter screen 4 is blocked by the water film, at this time, the washing tub 3 and the evaporator 1 are in a disconnected state, and the hot air will preferentially pass through the water film elimination channel 5 and blow towards the filter screen 4, thereby quickly and effectively eliminating the water film on the filter screen 4.

[0047] In order to further increase the air outlet area of the filter screen 4 and improve the water film elimination rate, the tail end of the water film elimination channel 5 is further provided with a first branch channel 51, a second branch channel 52 and a third branch channel 53; the first branch channel 51, the second branch channel 52 and the third branch channel 53 are arranged in sequence along the plane direction formed by the filter screen 4, which not only increases the air outlet area, but also improves the effective utilization rate of the airflow. It should be noted that when the tail end of the water film elimination channel 5 is provided with branch channels, this embodiment only exemplifies one setting mode, and the structure of the tail end of the water film elimination channel 5 can be set according to actual conditions, which is not limited here.

[0048] In order not to affect the drying efficiency of the clothes, the cross-sectional area of the water film elimination channel 5 is smaller than that of the drying air inlet duct 63, so that the water film elimination channel 5 has a larger air resistance. Therefore, when there is no or less lint on the filter screen 4, at this time, the drying air duct and the water film elimination channel 5 are both in a connected ventilation state, and because the air resistance of the drying air duct is much smaller than that of the water film elimination channel 5, most or all of the hot air preferentially passes through the drying air inlet duct 63 and enters the washing tub 3, thereby effectively eliminating the influence of the water film elimination channel 5 and improving the drying efficiency; in order to further eliminate the influence of the water film elimination channel 5, a control valve 7 is arranged at the connection between the water film elimination channel 5 and the fan volute tongue 62, and the amount of hot air entering the water film elimination channel 5 is controlled by controlling the opening and closing of the control valve 7, that is, when the control valve 7 is in a closed state, all the hot air can only enter the washing tub 3 through the drying air inlet duct 63, and when the control valve 7 is opened, the hot air will blow towards the filter screen 4 through the water film elimination channel 5.

[0049] When the filter screen 4 is cleaned, in order to determine whether the filter screen 4 is blocked by the water film in time, the end of the drying air inlet pipeline 63 is provided with a wind speed detection probe 631 for detecting the flow rate of the hot air blown out from the drying air inlet pipeline 63; when the wind speed detected by the wind speed detection probe 631 is less than or equal to a preset wind speed, it is determined that the filter screen 4 is blocked, and the control valve 7 is opened to blow the hot air out from the water film eliminating channel 5; when the wind speed detected by the wind speed detection probe 631 is greater than the preset wind speed, it is determined that the water film on the filter screen is eliminated, and the control valve 7 is closed.

[0050] It should be noted that the end of the water film eliminating channel 5 can be arranged at any side of the filter screen 4, as long as the air outlet direction is towards the filter screen, which is not limited herein. However, it should be noted that when the end of the water film eliminating channel 5 is arranged at the side of the filter screen 4 inside the drying air outlet channel (i.e. the end of the water film eliminating channel 5 is arranged between the washing tub and the filter screen), the end of the drying air inlet pipeline 63 is provided with a drying control valve; when the wind speed detected by the wind speed detection probe is less than or equal to a preset wind speed, the drying control valve is closed, and the control valve 7 is opened, so that the hot air is blown out from the water film eliminating channel.

[0051] In the first embodiment, when the washer-dryer runs the drying program, the hot air from the condenser enters the washing tub through the drying air inlet channel to dry the wet clothes in the washing tub, and then is discharged to the evaporator through the drying air outlet channel. In this process, the lint in the wet clothes is accumulated on the filter screen. After the filter screen is cleaned with water, water molecules may form a water film on the filter screen. The water film eliminating channel connected with the drying air inlet channel blows hot air, which evaporates the water film quickly through temperature difference and accelerates the rupture of the water film through the generated wind force. Compared with the prior art which only provides the drying air inlet channel and the drying air outlet channel, the water film eliminating channel of the present solution can effectively eliminate the water film formed on the filter screen, ensure the effective circulation of the drying air inlet channel and the drying air outlet channel during drying, further improve the drying efficiency of the washer-dryer, reduce energy consumption, and improve the user experience.

[0052] Embodiment two

[0053] At present, after the washing and drying all-in-one machine runs for a period of time, many stains and bacteria will accumulate between the inner and outer drums of the washing and drying all-in-one machine, which will cause secondary pollution to clothes, affect human health, and after the drying program runs, lint will also cover the filter screen, which will affect the drying efficiency. Therefore, during the operation of the washing and drying all-in-one machine, the drum cleaning program needs to be run in time to ensure the safety and efficiency of washing and drying. However, since the current washing and drying all-in-one machine has no reminding function, the user cannot run the drum cleaning program in time, which causes the drying efficiency or the cleaning degree of clothes to decrease, and reduces the use performance of the washing and drying all-in-one machine. In order to solve the above problems, the present application provides a corresponding solution, please refer to Figure 2 , specifically:

[0054] On the basis of the structure of the above embodiment one, the present application further provides a control method of a washing and drying all-in-one machine, which is realized based on the above washing and drying all-in-one machine, and specifically includes the following steps:

[0055] S1, judge whether the current running drying program frequency is greater than or equal to the drying frequency preset value or the current running washing program frequency is greater than or equal to the washing frequency preset value.

[0056] In S1, let the current running drying program frequency be Nh, the drying frequency preset value be Na, the current running washing program frequency be Nx, and the washing frequency preset value be Nb. The drying frequency preset value and the washing frequency preset value are the highest cumulative drying frequency and the highest cumulative washing frequency of the washing and drying all-in-one machine when maintaining a high performance state, which are obtained through test. When the drying frequency exceeds the drying frequency preset value, the drying efficiency of the washing and drying all-in-one machine will decrease, indicating that there is more lint on the filter screen, which affects the drying efficiency. When the washing frequency exceeds the washing frequency preset value, the cleaning degree of clothes of the washing and drying all-in-one machine is low, indicating that many stains and bacteria have accumulated between the inner and outer drums, causing secondary pollution to clothes. When the washing and drying all-in-one machine is turned on, first judge whether the current running drying program frequency is greater than or equal to the drying frequency preset value or the current running washing program frequency is greater than or equal to the washing frequency preset value. Through the judgment result, it can be quickly known whether the drying efficiency or the washing efficiency of the washing and drying all-in-one machine is in a high performance state, that is, whether the washing and drying all-in-one machine needs to run the drum cleaning program can be quickly judged.

[0057] S2, if yes, remind the user to select the drum cleaning program.

[0058] If the current running drying program number is greater than or equal to the drying number preset value or the current running washing program number is greater than or equal to the washing number preset value, it indicates that the drying efficiency of the washing and drying integrated machine does not meet the requirements or the cleaning degree does not meet the requirements, and the drum cleaning program needs to be run in time. The user can be reminded to select the drum cleaning program through the color change reaction or the text prompt of the display panel, so that the washing and drying integrated machine can run the drum cleaning program, and the filter screen flushing valve and the water inlet valve are opened to flush the filter screen and the inner and outer drums.

[0059] S3, if not, whether the current program is a drying program or a washing program.

[0060] Before the step S3, the method further comprises: judging whether the user selects the drum cleaning program; if the user selects the drum cleaning program, the washing and drying integrated machine runs the drum cleaning program, and the running number of the drying program and the running number of the washing program are restored to the initial preset value. Specifically, the initial preset value of the running number of the drying program and the running number of the washing program can be 0, i.e., Nh=0 and Nx=0. If the user does not select the drum cleaning program, whether the current program is a drying program or a washing program is judged. If yes, the step S4 is executed. If not, the washing and drying integrated machine does not run the drying program or the washing program, and runs according to the selected program, and the running number of the drying program or the running number of the washing program is not accumulated.

[0061] S4, if the current running program is a drying program or a washing program, the corresponding running number is increased by 1.

[0062] In the step S4, if the current running program is a drying program, the running number of the drying program is increased by 1 based on the current running number of the drying program, i.e., the current running number of the drying program Nh=Nh+1, and the drying program is run until it is finished. If the current running program is a washing program, the running number of the washing program is increased by 1 based on the current running number of the washing program, i.e., the current running number of the washing program Nx=Nx+1, and the washing program is run until it is finished.

[0063] In the embodiments of the present application, after judging that the current running drying program number is greater than or equal to the drying number preset value or the current running washing program number is greater than or equal to the washing number preset value, the user is reminded to select the drum cleaning program, so that the washing and drying integrated machine can run the drum cleaning program, and the filter screen and the inner and outer drums are cleaned in time. The problems that after the washing and drying integrated machine runs a washing program for a period of time, many stains and bacteria accumulate between the inner and outer drums, causing the cleaning degree of clothes to decrease, and after the drying program is run, lint covers the filter screen, affecting the drying efficiency, are effectively solved. The safety and efficiency of washing and drying are ensured, the use performance of the washing and drying integrated machine is improved, and the service life of the washing and drying integrated machine is prolonged.

[0064] Embodiment three

[0065] When the washing-drying machine runs the drum cleaning program, the filter screen can be covered by the water film, thereby causing the drying air duct to be disconnected and reducing the drying efficiency. In order to determine whether the filter screen is covered by the water film in time and eliminate the water film in time and improve the drying efficiency, the application provides a corresponding scheme, please refer to Figure 3 , specifically: in S3 in the above embodiment two, further comprising:

[0066] S301, after running the drum cleaning program, determining whether the air speed in the drying air inlet duct is less than a preset air speed for a period of time.

[0067] In S301, a wind speed detection probe is arranged at the end of the drying air inlet duct. After the washing-drying machine runs the drum cleaning program, the hot air speed (i.e. the air speed in the drying air inlet duct) entering the washing tub from the drying air inlet duct is detected in real time by the wind speed detection probe. The preset air speed is the air speed of the washing-drying machine in a high-performance drying state, which is a preset value. By comparing the air speed in the drying air inlet duct with the preset air speed for a period of time, it can be quickly determined whether the drying air duct is effectively circulated. The principle is that if the air speed in the drying air inlet duct is continuously greater than or equal to the preset air speed, it means that the hot air in the drying air duct is in normal effective circulation, and it means that the filter screen is not covered by the water film. If the air speed in the drying air inlet duct is continuously less than the preset air speed, it means that the hot air in the drying air duct flows slowly and cannot be effectively circulated, which means that the filter screen has been covered by the water film, affecting the effective circulation of the hot air and reducing the drying efficiency.

[0068] S302, if yes, open the control valve.

[0069] In S302, as described above, if the air speed in the drying air inlet duct is less than the preset air speed, it means that the filter screen has been covered by the water film. By opening the control valve, the hot air is blown to the filter screen through the water film elimination channel, so as to accelerate the evaporation of the water film. If the air speed in the drying air inlet duct is greater than or equal to the preset air speed, the original state is maintained.

[0070] S303, after opening the control valve, determining whether the air speed in the drying air inlet duct is greater than or equal to the preset air speed for a period of time; if yes, close the control valve.

[0071] In S303, the control valve is opened to make the hot air blow to the water film on the filter screen. When the water film on the filter screen is eliminated by evaporation, the washing tub is reconnected with the evaporator. Since the air resistance of the water film elimination passage is much greater than the air resistance of the drying air inlet pipeline, when the washing tub is connected with the evaporator, the hot air will preferentially select the drying air inlet pipeline. At this time, the air speed in the drying air inlet pipeline will increase. When it is judged that the air speed in the drying air inlet pipeline continuously is greater than or equal to the preset air speed in a period of time, it is indicated that the water film on the filter screen has been completely eliminated, and the drying air pipeline is reconnected for effective circulation. Then, the control valve can be closed to make all the hot air enter the washing tub through the drying air inlet pipeline, thereby improving the drying efficiency. When it is judged that the air speed in the drying air inlet pipeline continuously is less than the preset air speed in a period of time, the original state is maintained, that is, the state of opening the control valve is maintained.

[0072] In the embodiment of the present application, when the washer-dryer runs the drum cleaning program, the air speed detection probe is used to detect the air speed of the hot air entering the washing tub from the drying air inlet pipeline in real time. When the air speed in the drying air inlet pipeline is less than the preset air speed, the control valve is opened to make the hot air blow to the water film on the filter screen, accelerate the evaporation of the water film, and then make the drying air pipeline circulate effectively. After the drying air pipeline circulates effectively, the control valve is closed to make all the hot air enter the washing tub, thereby improving the drying efficiency.

[0073] As to the device in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be described in detail here.

[0074] The scheme of the present application has been described in detail above with reference to the drawings. In the above embodiments, the description of each embodiment is focused on, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments. It should be known by those skilled in the art that the actions and modules involved in the specification are not necessarily required by the present application. In addition, it can be understood that the steps in the method of the embodiments of the present application can be adjusted, combined and reduced in sequence according to actual needs, and the modules in the device of the embodiments of the present application can be combined, divided and reduced according to actual needs.

[0075] The flow diagrams and block diagrams in the drawings are diagrammatic and only show possible architectures, functionalities and operations for the systems and methods in accordance with various embodiments of the present application. It should also be noted that in some alternative implementations, the functions noted in the blocks can occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently or the blocks may be executed in the reverse order, depending on the functionality involved. These embodiments of the application can be implemented in software, firmware, hardware, or a combination thereof, and can be implemented in an operating system or in a separate process running on a machine. Embodiments of the application can also be implemented as instructions stored on a machine-readable medium, which can be read and executed by one or more processors. A machine-readable medium can include any mechanism for storing or transmitting information in a form readable by a machine, including non-transitory machine-readable media such as floppy disks, optical disks, compact discs, DVDs, read-only memory (ROM), random-access memory (RAM), erasable programmable memory (EPROM), electrically erasable programmable memory (EEPROM), magnetic or optical cards, flash memory, and tape. The terms "machine-readable medium" and "computer-readable medium" include, but are not limited to portable computers disks, compact discs, and magnetic disks or tapes. The instructions can include code from any computer- readable medium. The code can create instructions that, when executed by one or more processors, perform a particular process. The code can be any code desired to perform the functions described above. The code can include machine code, assembly language, object code, higher-level languages explained with the use of an interpreter, an executable, intermediate code such as compiled C or Java, and complete code in a computer-executable or other suitable format. The code can create an executable program that can run on one or more processors.

Claims

1. A washer-dryer, comprising an evaporator (1), a condenser (2) and a washing tub (3); a drying air inlet channel is arranged between the condenser (2) and the washing tub (3), and a drying air outlet channel is arranged between the washing tub (3) and the evaporator (1); a filter screen (4) is arranged at the end of the drying air outlet channel, characterized in that: The water film elimination channel (5) is connected with the drying air inlet channel at the front end and is arranged at one side of the filter screen (4) at the tail end, and the air outlet direction is towards the filter screen (4). The drying air inlet channel comprises a fan volute tongue (62), and a drying air inlet pipeline (63) is arranged at the air outlet of the fan volute tongue (62); the front end of the water film elimination channel (5) is arranged at the air outlet of the fan volute tongue (62); the cross-sectional area of the water film elimination channel (5) is smaller than the cross-sectional area of the drying air inlet pipeline (63); and the air resistance of the water film elimination channel (5) is greater than the air resistance of the drying air inlet pipeline (63). When there is no or little lint on the filter screen (4), hot air preferentially enters the washing tub (3) through the drying air inlet pipeline (63); when the mesh holes on the filter screen (4) are blocked by a water film, hot air preferentially blows out towards the filter screen (4) through the water film elimination channel (5).

2. The washer-dryer combination according to claim 1, characterized in that: The tail end of the drying air inlet pipeline (63) is provided with a wind speed detection probe (631).

3. The washer-dryer combination according to claim 1, characterized in that: The tail end of the water film elimination channel (5) is further provided with a first branch channel (51), a second branch channel (52) and a third branch channel (53); The first branch channel (51), the second branch channel (52) and the third branch channel (53) are arranged in sequence along the plane direction formed by the filter screen (4) respectively.

4. The washer-dryer combination according to claim 1, characterized in that: The connection position of the water film elimination channel (5) and the fan volute tongue (62) is provided with a control valve (7). The washer-dryer combination according to any one of claims 1-4 is realized, and specifically comprises the following steps:

5. A control method of a washer-dryer, characterized in that: It is judged whether the current running drying program frequency is greater than or equal to the drying frequency preset value or the current running washing program frequency is greater than or equal to the washing frequency preset value; If yes, the user is reminded to select the drum cleaning program; If no, it is judged whether the current program is a drying program or a washing program, If the current running program is a drying program or a washing program, the corresponding running frequency is increased by 1.

6. The control method of the washer-dryer combination according to claim 5, characterized in that: Before the step of judging whether the current program is a drying program or a washing program, the following steps are further included: It is judged whether the user selects the drum cleaning program; If yes, the drum cleaning program is run, and the drying program running frequency and the washing program running frequency are restored to the initial preset value.

7. The control method of the washer-dryer combination according to claim 6, characterized in that: After the step of running the drum cleaning program, the following steps are further included: It is judged whether the wind speed in the drying air inlet pipeline is continuously less than the preset wind speed within a period of time; If yes, the control valve is opened.

8. The control method of the washer-dryer combination according to claim 7, characterized in that: After the step of opening the control valve, the following steps are further included: It is judged whether the wind speed in the drying air inlet pipeline is continuously greater than or equal to the preset wind speed within a period of time; ​ If so, the control valve is closed. If so, the control valve is closed.

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