Clothes dryer

Abstract

The embodiment of the application provides a clothes dryer, comprising: a cabinet; a drying barrel and an air circulation system; an air inlet assembly and an air outlet assembly; a heater and an air inlet pipeline, an air flow meter; a filter screen, an air outlet pipeline and an air outlet fan, an air outlet motor and a fan; a controller connected with the air flow meter and the air outlet motor respectively, used for executing a clothes dryer filter screen detection program, the program comprising the following steps: controlling the air outlet motor to reach a preset rotating speed and keeping the air outlet motor running at the preset rotating speed; detecting a current power value of the air outlet motor in the process of keeping the air outlet motor running at the preset rotating speed and a historical power value detected in the process of historically executing the clothes dryer filter screen detection program, and judging whether the filter screen is blocked based on the current power value and the historical power value; and / or, obtaining an air speed value of the air flow meter and judging whether the filter screen is blocked based on the air speed value; if at least one of the above is yes, it is determined that the filter screen is blocked. The application can improve the accuracy of filter screen cleaning detection.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of clothes drying machines, in particular to a clothes drying machine. BACKGROUND

[0002] The clothes drying machine is a drying device capable of drying wet clothes. During the operation of the clothes drying machine, the heater located at the front end of the air inlet pipeline heats the air, which is then sucked into the drying drum through the air inlet pipeline, so that the wet clothes exchange heat with the high-temperature dry gas in the drying drum. The gas after heat exchange often wraps the residual lint or fine impurity dust in the dried clothes, and the gas will stop the lint or fine impurity dust on the filter screen after passing through the filter screen, which is extremely easy to cause the filter screen to be blocked.

[0003] Once the filter screen is blocked, it will affect the normal operation of the clothes drying machine, and further affect the drying effect of the final clothes. Therefore, it is extremely important to ensure that the filter screen is not blocked. However, the detection accuracy of whether the filter screen is blocked is poor at present.

[0004] Therefore, there is an urgent need for a clothes drying machine capable of accurately detecting whether the filter screen is blocked. SUMMARY

[0005] To solve the above technical problems, the embodiments of the present application provide a clothes drying machine.

[0006] According to one aspect of the embodiments of the present application, the embodiments of the present application provide a clothes drying machine, comprising: a cabinet; a drying drum and an air circulation system arranged in the cabinet; the air circulation system comprises an air inlet assembly and an air outlet assembly; the air inlet assembly comprises a heater and an air inlet pipeline, which is used to make the heated air enter the drying drum to exchange heat with the clothes in the drying drum, and a wind speed meter is further arranged in the air inlet pipeline; the air outlet assembly comprises a filter screen, an air outlet pipeline and an air outlet fan, the gas after heat exchange is discharged from the air outlet pipeline after passing through the filter screen under the action of the air outlet fan, and the air outlet fan comprises an air outlet motor and a fan; a controller is electrically connected with the wind speed meter and the air outlet motor respectively, and is used to execute a clothes drying machine filter screen detection program, the clothes drying machine filter screen detection program comprises the following steps: controlling the air outlet motor to reach a preset rotating speed and keeping the air outlet motor running at the preset rotating speed; detecting a current power value of the air outlet motor in the process of keeping the air outlet motor running at the preset rotating speed, and a historical power value detected in the process of historically executing the clothes drying machine filter screen detection program, and judging whether the filter screen is blocked based on the current power value and the historical power value; and / or, obtaining a wind speed value of the wind speed meter, and judging whether the filter screen is blocked based on the wind speed value; if at least one of the above is yes, it is determined that the filter screen is blocked.

[0007] In the above embodiment, the filter screen is accurately determined to be blocked by detecting the wind speed value of the exhaust fan during the process of keeping the preset rotating speed, and based on the wind speed value; and the filter screen is also accurately determined to be blocked according to the current power value of the exhaust fan during the process of keeping the preset rotating speed and the historical power value obtained during the process of executing the filter screen detection program of the clothes dryer in history, and if there is at least one determination of yes in the two determinations, it is determined that the filter screen is blocked and needs to be cleaned.

[0008] In an embodiment of the present application, based on the foregoing scheme, the filter screen detection program of the clothes dryer further comprises the following steps: first, determining whether the filter screen is blocked by the wind speed value, and then determining whether the filter screen is blocked based on the current power value and the historical power value in the case of no.

[0009] In the above embodiment, whether the filter screen is blocked is first determined by the wind speed value of the exhaust fan during the process of keeping the preset rotating speed, and the second determination of whether the filter screen is blocked is made based on the current power value and the historical power value in the case of no in the first determination, and the filter screen is finally determined to be unblocked only in the case of no in the second determination, so that whether the filter screen is blocked is accurately determined through two continuous determinations.

[0010] In an embodiment of the present application, based on the foregoing scheme, in the filter screen detection program of the clothes dryer, the step of determining whether the filter screen is blocked based on the wind speed value comprises: if the wind speed value is below a preset wind speed value, it is determined that the filter screen is blocked, and the preset wind speed value represents the minimum wind speed value in the air inlet pipeline when the filter screen is blocked; if the wind speed value reaches the preset wind speed value or above, it is determined that the filter screen is unblocked.

[0011] In the above embodiment, the preset wind speed value represents the minimum wind speed value in the air inlet pipeline when the filter screen is blocked, and since the higher the degree of blockage of the filter screen is, the smaller the wind speed value reflected is when the exhaust fan keeps the preset rotating speed, if the wind speed value reaches the preset wind speed value or above, it is accurately determined that the filter screen is unblocked, and if the wind speed value is below the preset wind speed value, it is accurately determined that the filter screen is blocked.

[0012] In one embodiment of the present application, based on the foregoing scheme, in the clothes dryer filter screen detection program, the step of determining whether the filter screen is clogged based on the current power value and the historical power value includes: calculating the difference between the current power value and the historical power value; if the difference is below a preset value, determining that the filter screen is clogged, the preset value representing the minimum power difference when the filter screen is clogged, and the preset value being a positive number; if the difference reaches the preset value or above, determining that the filter screen is not clogged.

[0013] In the above embodiment, since the clothes may continuously drop lint during the drying process, the clogging degree of the filter screen in the current clothes dryer filter screen detection program will only increase compared to the previous clogging degree of the filter screen, so if the difference between the current power value and the historical power value is below the preset value, it indicates that the increased amount of lint in the subsequent drying process cannot affect the air intake, and the clogging of the filter screen can be accurately determined; if the difference between the current power value and the historical power value reaches the preset value or above, it indicates that the increased amount of lint in the subsequent drying process can affect the air intake, and the clogging of the filter screen can be accurately determined.

[0014] In one embodiment of the present application, based on the foregoing scheme, the step of determining whether the filter screen is clogged based on the current power value and the historical power value further includes: if the difference is a negative value, determining that the filter screen is not clogged.

[0015] In the above embodiment, in order to prevent the filter screen from being determined as clogged due to human intervention to clean the filter screen, if the difference is a negative value, it can be accurately determined that the filter screen is not clogged, and cleaning is not required.

[0016] In one embodiment of the present application, based on the foregoing scheme, the control is further configured to perform the following steps: before starting to execute the clothes dryer filter screen detection program, determining whether the current program execution corresponds to the first detection after the filter screen is cleaned; if it is determined to be yes, during the execution of the clothes dryer filter screen detection program, determining whether the filter screen is clogged based only on the air speed value, and recording the power of the exhaust fan during the process of maintaining the preset rotation speed; if it is determined to be no, normally executing the clothes dryer filter screen detection program.

[0017] In the above embodiment, before starting to execute the filter screen detection program of the clothes dryer, it is judged whether the current program corresponds to the first detection after the filter screen is cleaned. If it is the first detection after the filter screen is cleaned, it is judged whether the filter screen is blocked based on the wind speed value only, and the power of the exhaust fan during the process of maintaining the preset rotating speed is recorded, so that the power recorded in the current detection is taken as the historical power value in the next detection, thereby ensuring the detection accuracy of whether the clothes dryer is blocked and simplifying the detection process.

[0018] In an embodiment of the present application, based on the foregoing scheme, the clothes dryer filter screen detection program further comprises the following steps: when the starting instruction of the clothes dryer filter screen detection program is detected, it is judged whether the door body of the clothes dryer is closed; if it is judged that the door body is closed, the filter screen detection indicator light is controlled to display a detection state, and the step of controlling the exhaust fan to reach the preset rotating speed and maintaining the preset rotating speed is executed.

[0019] In an embodiment of the present application, based on the foregoing scheme, the clothes dryer filter screen detection program further comprises the following steps: in the case where it is determined that the filter screen is not blocked, the filter screen detection indicator light is controlled to display an end state, and the exhaust fan is controlled to stop running; in the case where it is determined that the filter screen is blocked, the filter screen detection indicator light is controlled to display a prompt state.

[0020] In the above embodiment, in the case where it is determined that the filter screen is blocked, the prompt state displayed by the filter screen detection indicator light can timely remind the user to clean the filter screen, thereby avoiding affecting the normal use of the clothes dryer subsequently.

[0021] In an embodiment of the present application, based on the foregoing scheme, the controller further executes the following steps: if it is detected that the door body of the clothes dryer is opened and then closed after the drying program is ended, the clothes dryer enters a filter screen detection candidate state after waiting for a preset time length; in the filter screen detection candidate state, the temperature value of the heater is detected, and when the temperature value is below a preset temperature value, the clothes dryer filter screen detection program is started to be executed.

[0022] In an embodiment of the present application, based on the foregoing scheme, the controller further executes the following steps: in the case where it is determined that the filter screen is blocked, a prompt message is generated, and the prompt message is sent to a user terminal bound in advance.

[0023] In the above embodiment, in the case where it is determined that the filter screen is blocked, a prompt message is generated and sent to a user terminal bound in advance, which can timely remind the user to clean the filter screen, thereby avoiding affecting the normal use of the clothes dryer subsequently.

[0024] 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

[0025] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and serve to explain the principles of the application. It is readily apparent to one skilled in the art that the following description is merely exemplary and explanatory of the application and that various embodiments of the application can be readily made without departing from the spirit and scope of the application. In the drawings:

[0026] Figure 1 is a three-dimensional structural schematic diagram of a clothes dryer according to an exemplary embodiment of the present application;

[0027] Figure 2 is a side structural schematic diagram of a clothes dryer according to an exemplary embodiment of the present application;

[0028] Figure 3 is a flowchart of steps for foreign object detection according to an exemplary embodiment of the present application;

[0029] Figure 4 is a flowchart of steps for a filter screen detection program according to an exemplary embodiment of the present application;

[0030] Figure 5 is a flowchart of steps executable by a controller in a clothes dryer according to an exemplary embodiment of the present application. DETAILED DESCRIPTION

[0031] The exemplary embodiments will now be described in detail with reference to the accompanying drawings. The following description is merely exemplary and explanatory of the application and is not restrictive of the application, as claimed. Conversely, the exemplary embodiments described herein are merely examples of apparatus and methods consistent with some aspects of the present application as detailed in the appended claims.

[0032] The block diagrams shown in the drawings are merely functional entities and do not necessarily have to correspond to physically independent entities. That is, the functional entities can be implemented in software, or in one or more hardware modules or integrated circuits, or in different network and / or processor devices and / or microcontroller devices.

[0033] The flow chart shown in the drawings is only an exemplary illustration, and is not necessarily required to include all the contents and operations / steps, nor is it necessarily required to be executed in the order described. For example, some operations / steps can be further broken down, and some operations / steps can be combined or partially combined, so the actual execution order can be changed according to actual conditions.

[0034] It should also be noted that "multiple" referred to in the present application means two or more. The association relationship of "and / or" describes the associated objects, which means that there can be three relationships, for example, A and / or B can represent the three cases of A alone, A and B together, and B alone. The character " / " generally represents an "or" relationship between the associated objects before and after it.

[0035] The terms "first", "second", "third", and "fourth" and the like in the description and claims of the present application and the drawings are used to distinguish different objects, and are not used to describe a specific order. The terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but can optionally include steps or units not listed, or can optionally include other steps or units inherent to the process, method, product, or device.

[0036] To solve the technical problem that the detection accuracy of whether the filter screen is blocked is poor at present, the present application provides a clothes dryer capable of accurately detecting whether the filter screen is blocked, Figure 1 is a three-dimensional structural schematic diagram of a clothes dryer provided by an exemplary embodiment of the present application. As shown in Figure 1 The clothes dryer 100 includes a drying drum 101, an exhaust fan 102, a valve 103, a duct 104, a heating duct 105, and a filter screen 106. Each part of the clothes dryer 100 will be introduced one by one below.

[0037] It should be noted that in actual application, the structure of the clothes dryer can also be adjusted according to actual needs, for example, the corresponding components can be added / reduced / replaced on the structure of the clothes dryer shown in Figure 1 The structure shown in Figure 1 is not limited to the structure shown in

[0038] The drying drum 101 is arranged inside the clothes dryer 100, is usually made of stainless steel, is used to accommodate and dry the clothes to be dried, and is rotated to uniformly heat the clothes to be dried, so as to remove the moisture in the clothes to be dried.

[0039] The exhaust fan 102 is used to exhaust the moisture and heat from the drying drum, maintain a suitable environment in the drying drum 101, and improve the drying efficiency.

[0040] Valve 103 controls the flow of hot air inside the drying drum 101 by opening or closing it and adjusting the opening degree of valve 103, so as to meet different drying needs.

[0041] The air duct 104 is responsible for transmitting the generated hot air from the heating pipe 105 to the drying barrel and for discharging the dehumidified air from the drying barrel 101.

[0042] The heating pipe 105 is responsible for generating hot air by heating the air, which can be transported into the drying drum 101 to provide the heat energy required for the drying process, ensuring that the clothes in the drying drum receive sufficient heat and achieve a rapid drying effect.

[0043] Filter 106 is used to prevent fine fibers, dust and other particles from entering the air circulation system in order to maintain the normal operation of the equipment and the cleanliness of the user environment.

[0044] Please continue reading. Figure 2 , Figure 2 This is a side view structural diagram of a clothes dryer provided in an exemplary embodiment of this application. Figure 2 As shown, the dryer 200 includes lifting ribs 201, an anemometer 202, an air inlet duct 203, an exhaust duct 204, an exhaust motor 205, a housing 206, a filter 207, a door 208, a drying drum 209, a main control board 210, a filter indicator light 211, and a controller. The following will describe each part of the dryer 200 in detail.

[0045] Similarly, in practical applications, the structure of a clothes dryer can be adjusted according to actual needs; for example, it can be... Figure 2 The dryer structure shown can be modified by adding / removing / replacing corresponding parts. This section does not limit the structure of the dryer to only one type. Figure 2 The structure shown.

[0046] The lifting rib 201 is a structural component used to support and fix the drying drum 209, ensuring that the drying drum 209 remains stable during operation and preventing the drying drum 209 from shaking.

[0047] Anemometer 202, installed inside air inlet duct 203, is used to monitor the wind speed of air entering air inlet duct 203. It can provide real-time wind speed data to help the control system adjust the air intake and exhaust, and ensure that the temperature and humidity are controlled within a suitable range during the drying process.

[0048] The air inlet duct 203 is connected to the external air passage and to air inlet components such as heaters, and is responsible for introducing fresh air into the air circulation system for drying clothes.

[0049] The exhaust duct 204 is responsible for discharging the humid air generated during the drying process out of the dryer 200 to maintain a dry environment in the drying drum 209.

[0050] The exhaust fan 205 is responsible for providing power to drive the fan to push the air out of the dryer 200 through the exhaust duct 204 to maintain a dry environment in the drying drum 209.

[0051] The cabinet 206 is the external structure of the dryer 200, which is used to fix and protect the internal components. The cabinet 206 is usually made of metal or plastic. The cabinet 206 is usually also provided with a door body 208, which is used to put clothes into or take clothes out of the drying drum 209, and the door body 208 is usually provided with a sealing ring to prevent water leakage.

[0052] The cabinet 206 is usually also provided with a main control panel 210, which has buttons, knobs or touch screens on it. The main control panel 210 is connected to various components of the dryer 200 and is responsible for controlling the operation and drying process of the entire dryer 200. The filter screen indicator light 211 is used to display the cleaning status of the filter screen 207 and remind the user whether the filter screen needs to be cleaned or replaced.

[0053] The filter screen 207 is installed on the exhaust duct and is used to filter dust, fibers and other impurities in the air discharged during the drying process to prevent impurities from entering the external environment and ensure that the discharged air is relatively clean.

[0054] The drying drum 209 is arranged inside the dryer 200 and is usually made of stainless steel. It is used to contain and dry the clothes to be dried. The clothes to be dried are evenly heated by rotation to facilitate the removal of moisture from the clothes to be dried.

[0055] The controller is electrically connected with the anemometer and the exhaust fan, and is used to execute the dryer filter screen detection program. In order to determine whether the dryer filter screen detection program can be normally executed, the controller can execute the following steps to make a judgment:

[0056] If it is detected that the dryer door is opened and then closed after the drying program is completed, the filter screen detection candidate state is entered after waiting for a preset time.

[0057] In the filter screen detection candidate state, the temperature value of the heater is detected. When the temperature value is below the preset temperature value, the dryer filter screen detection program is started to be executed.

[0058] The following two steps are described in detail.

[0059] The door is closed after being opened, which is the first determination that the clothes in the drying barrel have been taken out. The waiting for a preset time length is to reduce the temperature value of the heater in the clothes dryer. If the temperature value of the heater is too high, the air in the drying barrel will be heated, thereby affecting the normal operation of the subsequent clothes dryer filter screen detection program. Therefore, after waiting for a preset time length, the filter screen detection candidate state is entered, and the temperature value of the heater is detected in the filter screen detection candidate state. When the temperature value of the heater is below the preset temperature value, the clothes dryer filter screen detection program is started to be executed.

[0060] Since the presence of foreign matter in the drying barrel will affect the normal operation of the clothes dryer filter screen detection program, a second determination is needed to accurately determine that there is no foreign matter in the drying barrel. Preferably, before the clothes dryer filter screen detection program is executed, a foreign matter detection program is executed to detect whether there is foreign matter in the drying barrel. The foreign matter includes but is not limited to living things, metal objects, plastic objects and sharp objects.

[0061] Please refer to Figure 3 , Figure 3 is a step flow chart of the foreign matter detection provided by an exemplary embodiment of the present application. The way to detect whether there is foreign matter in the drying barrel includes but is not limited to using infrared sensors, weight sensors, vibration sensors and current sensors. After the first detection by the sensors that there is no foreign matter in the drying barrel, the drum motor is started and the instantaneous current Ix when the drum motor is started is detected. The instantaneous current Ix is compared with the maximum current Io of the multiple times of simulation of no-load start in advance. If it is judged that the instantaneous current Ix reaches the maximum current Io or above, it is finally determined that there is foreign matter in the drying barrel. If it is judged that the instantaneous current Ix is below the maximum current Io, it is determined again that there is no foreign matter in the drying barrel.

[0062] After it is determined that there is foreign matter in the drying barrel, the filter screen indicator light is controlled to slowly flash to prompt that the subsequent clothes dryer filter screen detection program cannot be normally performed. Preferably, the reminder information is pushed to the user terminal bound in advance, so as to timely remind the user to clean the foreign matter in the drying barrel, thereby avoiding affecting the subsequent clothes dryer filter screen detection program. If the user selects to ignore in the user terminal or does not process within a preset time period, the indicator light is turned off and the foreign matter detection program is terminated.

[0063] After the foreign matter detection program is executed and it is ensured that there is no foreign matter in the drying barrel, the clothes dryer filter screen detection program is executed. Please refer to Figure 4 , Figure 4 is a step flow chart of the clothes dryer filter screen detection program provided by an exemplary embodiment of the present application. As Figure 4 shown, the clothes dryer filter screen detection program includes the following S410-S440:

[0064] S410, control the exhaust fan motor to reach a preset rotating speed and keep the preset rotating speed running;

[0065] S420, obtaining a wind speed value of the anemometer, and determining whether the filter screen is blocked based on the wind speed value;

[0066] S430, detecting a current power value of the exhaust motor in the process of keeping the preset rotating speed, and detecting a historical power value in the process of executing the filter screen detection program of the clothes dryer in the past, and determining whether the filter screen is blocked based on the current power value and the historical power value;

[0067] S440, if the at least one determination is yes, it is determined that the filter screen is blocked.

[0068] The four steps will be described in detail below.

[0069] Before S410, it is necessary to ensure that the door of the clothes dryer is in a closed state, because if the door body of the clothes dryer is in an open state, it will cause a large error in the subsequent clothes dryer filter screen detection program. Therefore, when the starting instruction of the clothes dryer filter screen detection program is detected, the embodiment first determines whether the door body of the clothes dryer is closed, if it is determined that the door body of the clothes dryer is closed, the filter screen detection indicator light is controlled to display a detection state, and the step of controlling the exhaust motor to reach a preset rotating speed and keeping the preset rotating speed is executed; if it is determined that the door body of the clothes dryer is open, the clothes dryer filter screen detection program is stopped.

[0070] In S410, the exhaust motor is controlled to keep the preset rotating speed after reaching the preset rotating speed, so as to ensure that the exhaust motor runs at the preset rotating speed every time the clothes dryer filter screen detection program is executed, and the blocking degree of the filter screen is taken as the only variable in the whole control process.

[0071] In S420, the wind speed value of the air entering the air inlet pipe detected by the anemometer is obtained. It should be noted that, due to different blocking degrees of the filter screen, the wind speed value of the air entering the air inlet pipe when reaching the preset rotating speed will be different, wherein the smaller the wind speed value of the air entering the air inlet pipe when reaching the preset rotating speed, the higher the blocking degree of the filter screen.

[0072] In the clothes dryer filter screen detection program, the step of determining whether the filter screen is blocked based on the wind speed value includes:

[0073] If the wind speed value is below a preset wind speed value, it is determined that the filter screen is blocked, and the preset wind speed value represents the minimum wind speed value in the air inlet pipe when the filter screen is blocked;

[0074] If the wind speed value reaches above the preset wind speed value, it is determined that the filter screen is not blocked.

[0075] The two steps will be described in detail below.

[0076] The preset wind speed value refers to the minimum wind speed value in the air inlet pipe when the filter screen is completely blocked. If the wind speed value is below the preset wind speed value, it indicates that the filter screen is completely blocked or the degree of blockage is higher than the degree of blockage corresponding to the preset wind speed value, so it is determined that the filter screen is blocked and needs to be cleaned. If the wind speed value reaches the preset current value, it indicates that the filter screen is not blocked and does not need to be cleaned.

[0077] In S430, similarly, when the exhaust fans are all running at the preset rotating speed, the degree of blockage of the filter screen will also affect the power value of the exhaust fan. Different degrees of blockage of the filter screen will result in different power values of the exhaust fan. Among them, the greater the power value of the exhaust fan reaches when running at the preset rotating speed, the higher the degree of blockage of the filter screen.

[0078] The historical power value is the power value recorded before the filter screen is cleaned and before the current program is executed. For example, the power value recorded by the first detection after the filter screen is cleaned is marked as the first recorded power value, the power value recorded by the second detection after the filter screen is cleaned is marked as the second recorded power value, and so on. If the power value recorded by the current detection is the third recorded power value, the power values recorded by the first detection and the second detection are both historical power values. If the power value recorded by the current detection is the fourth recorded power value, the power values recorded by the first detection, the second detection, and the third detection are all historical power values. The historical power values are usually recorded and stored in the data storage unit of the system for subsequent query and analysis.

[0079] The historical power values are set with corresponding weights in chronological order. Preferably, the closer the historical power value to the current detection, the higher the weight. For example, the historical power values include the first recorded power value, the second recorded power value, and the third recorded power value, which can be assigned weights of 2:3:5 in turn, or weights of 1:3:6 in turn. In addition, the historical power value closest to the current detection can be set with the highest weight, and the remaining historical power values can be set with the same weight. Similarly, the above examples can be assigned weights of 2:2:6 in turn, or weights of 3:3:4 in turn.

[0080] After calculating the weighted average value according to the historical power values set with corresponding weights, the weighted average value is compared with the current power value to accurately determine whether the filter screen is blocked. If the current power value is above the weighted average value, it is determined that the filter screen is blocked. If the current power value is below the weighted average value, it is determined that the filter screen is not blocked.

[0081] In another exemplary embodiment, in the filter screen detection program of the clothes dryer, the step of determining whether the filter screen is blocked based on the current power value and the historical power value comprises:

[0082] calculating a difference between the current power value and the historical power value;

[0083] if the difference is below a preset value, determining that the filter screen is blocked, the preset value representing a minimum power difference when the filter screen is blocked, the preset value being positive;

[0084] if the difference reaches above the preset value, determining that the filter screen is not blocked.

[0085] The three steps are described in detail as follows.

[0086] In the embodiment, the historical power value represents a power value recorded in the last program execution. For example, if the power value recorded in the current program execution is the power value recorded in the third detection after the filter screen is cleaned, the historical power value is the power value recorded in the second detection after the filter screen is cleaned; if the power value recorded in the current program execution is the power value recorded in the second detection after the filter screen is cleaned, the historical power value is the power value recorded in the first detection after the filter screen is cleaned.

[0087] It should be noted that, since the filter screen filters and accumulates a large amount of lint and impurities in each drying process, the amount of lint and impurities accumulated by the filter screen in each process is higher than that in the last process, so the power value detected in each process is necessarily greater than that in the last process.

[0088] As can be seen from the above, the minimum power difference when the filter screen is blocked is taken as the preset value, and the preset value is positive. If the difference between the current power value and the historical power value is below the preset value, it indicates that the power of the air inlet duct has little or no change under the condition that the rotation speed of the exhaust fan motor is unchanged, so that the filter screen can be accurately determined to be blocked; if the difference between the current power value and the historical power value reaches above the preset value, it indicates that the filter screen still filters more lint and impurities in each drying process, so that the filter screen can be accurately determined not to be blocked and temporarily does not need to be cleaned.

[0089] In addition, the present application takes into account the case that the user cleans the filter screen between two filter screen detection programs. Since the user cleans the filter screen, the current power value is less than the historical power value, so that the difference is negative and less than the preset value, thereby leading to a false determination that the filter screen is blocked. In order to avoid the false determination due to the user cleaning the filter screen, if the difference between the current power value and the historical power value is negative, the filter screen can be accurately determined not to be blocked and does not need to be cleaned.

[0090] In S440, if it is determined that the filter is clogged through S420, then it can be confirmed that the filter is clogged; if it is determined that the filter is clogged through S430, then it can also be confirmed that the filter is clogged; if it is determined that the filter is clogged through both S420 and S430, then it can be confirmed without a doubt that the filter is clogged; only when it is determined that the filter is not clogged through both S420 and S430 can it be confirmed that the filter is not clogged.

[0091] If the filter is confirmed to be unclogging, the filter detection indicator light will be turned off, and the exhaust motor will stop running, indicating that the dryer filter detection program has ended.

[0092] If the filter is found to be clogged, the filter detection indicator light will be set to a warning state, such as flashing rapidly. It can also send a reminder message to the pre-bound user terminal to remind the user to check or clean the filter in time to avoid affecting the normal use of the dryer.

[0093] In summary, as described in S410-S440, this embodiment can accurately determine whether the filter is clogged by detecting the wind speed value of the exhaust motor while it is running at a preset speed. Furthermore, it can also accurately determine whether the filter is clogged by detecting the current power value of the exhaust motor while it is running at a preset speed and the historical power value obtained during the execution of the dryer filter detection program. If at least one of the two determinations is positive, it can be accurately determined that the filter is clogged and needs to be cleaned.

[0094] In another exemplary embodiment, the current value is used to determine whether the filter is clogged. If the current value is not clogged, the current power value and historical power value are used to determine whether the filter is clogged.

[0095] Please see Figure 5 , Figure 5 This is a flowchart illustrating the steps that the controller in a dryer can execute, provided in an exemplary embodiment of this application. The controller can also be configured to execute the following steps S510-S530:

[0096] S510 controls the exhaust fan motor to reach a preset speed and maintains that preset speed.

[0097] S520 acquires the wind speed value from the anemometer and determines whether the filter is clogged based on the wind speed value;

[0098] S530: If the result is negative, then the filter is determined to be clogged based on the current power value and historical power value.

[0099] In S510-S530, the embodiment first determines whether the filter screen is blocked by the wind speed value of the exhaust fan in the process of keeping the preset rotating speed, and then determines whether the filter screen is blocked again based on the current power value and the historical power value in the case of no blockage of the filter screen in the initial determination. Only when the second determination is also no, the filter screen is finally determined to be not blocked. The filter screen is accurately determined to be blocked or not by the two continuous determinations.

[0100] In another exemplary embodiment, the controller further performs the following steps:

[0101] Before starting to execute the filter screen detection program of the clothes dryer, it is determined whether the current program execution corresponds to the first detection after the filter screen is cleaned.

[0102] If the determination is yes, during the execution of the filter screen detection program of the clothes dryer, it is only determined whether the filter screen is blocked based on the wind speed value, and the power of the exhaust fan in the process of keeping the preset rotating speed is recorded.

[0103] If the determination is no, the filter screen detection program of the clothes dryer is executed normally.

[0104] If it is the first detection after the filter screen is cleaned, there is no historical power value, and thus it is not possible to determine whether the filter screen is blocked based on the current power value and the historical power value. It is only possible to determine whether the filter screen is blocked according to the wind speed value, and the power of the exhaust fan in the process of keeping the preset rotating speed is recorded, so as to record the power of the current detection as the historical power value of the next detection, thereby simplifying the detection process while ensuring the detection accuracy of whether the clothes dryer is blocked. If it is not the first detection after the filter screen is cleaned, the filter screen detection program of the clothes dryer is executed normally.

[0105] Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the aspects of the application disclosed herein. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.

[0106] It should be understood that the above description is only the preferred exemplary embodiment of the application, and is not intended to limit the implementation of the application. Those skilled in the art can easily make corresponding changes or modifications according to the main idea and spirit of the application. Therefore, the protection scope of the application should be subject to the protection scope required by the claims.

Claims

1. A clothes dryer characterized by, The dryer comprises: a cabinet; a drying drum and an air circulation system arranged in the cabinet; the air circulation system comprises an air inlet assembly and an air outlet assembly; the air inlet assembly comprises a heater and an air inlet pipeline, and is used for making the heated air enter the drying drum to exchange heat with the clothes in the drying drum; the air inlet pipeline is further provided with an air speed meter; the air outlet assembly comprises a filter screen, an air outlet pipeline and an air outlet fan; the heat-exchanged air is discharged from the air outlet pipeline through the filter screen under the action of the air outlet fan; the air outlet fan comprises an air outlet motor and a fan; a controller electrically connected with the air speed meter and the air outlet motor, and used for executing a dryer filter screen detection program; the dryer filter screen detection program comprises the following steps: controlling the air outlet motor to reach a preset rotating speed and keeping the air outlet motor running at the preset rotating speed; detecting a current power value of the air outlet motor in the process of keeping the air outlet motor running at the preset rotating speed, and a historical power value detected in the process of historically executing the dryer filter screen detection program, and judging whether the filter screen is blocked based on the current power value and the historical power value; detecting an air speed value of the air speed meter, and judging whether the filter screen is blocked based on the air speed value; if at least one of the above judgments is yes, it is determined that the filter screen is blocked; in the dryer filter screen detection program, the step of judging whether the filter screen is blocked based on the current power value and the historical power value comprises: calculating a difference value between the current power value and the historical power value; if the difference value is below a preset value, it is determined that the filter screen is blocked, the preset value represents a minimum power difference when the filter screen is blocked, and the preset value is a positive number; if the difference value reaches the preset value or above, it is determined that the filter screen is not blocked; if the difference value is a negative number, it is determined that the filter screen is not blocked.

2. The clothes dryer according to claim 1, characterized in that, the dryer filter screen detection program further comprises the following steps: firstly, judging whether the filter screen is blocked through the air speed value, and then judging whether the filter screen is blocked based on the current power value and the historical power value in the case of no.

3. The clothes dryer according to claim 1 or 2, characterized in that, in the dryer filter screen detection program, the step of judging whether the filter screen is blocked based on the air speed value comprises: if the air speed value is below a preset air speed value, it is determined that the filter screen is blocked, the preset air speed value represents a minimum air speed value in the air inlet pipeline when the filter screen is blocked; if the air speed value reaches the preset air speed value or above, it is determined that the filter screen is not blocked.

4. The clothes dryer according to claim 1, characterized in that, the control is further configured to execute the following steps: before starting to execute the dryer filter screen detection program, judging whether this program execution corresponds to the first detection after the filter screen is cleaned; if the judgment is yes, only judging whether the filter screen is blocked based on the air speed value in the process of executing the dryer filter screen detection program, and recording the power of the air outlet motor in the process of keeping the air outlet motor running at the preset rotating speed; if the judgment is no, normally executing the dryer filter screen detection program.

5. The clothes dryer according to claim 1, characterized in that, the dryer filter screen detection program further comprises the following steps: When a start instruction of the filter screen detection program of the clothes dryer is detected, it is determined whether the door body of the clothes dryer is closed; If the determination is yes, the filter screen detection indicator light is controlled to display a detection state, and the step of controlling the exhaust fan to reach a preset rotating speed and keep running at the preset rotating speed is performed.

6. The clothes dryer according to claim 4, characterized in that, The filter screen detection program of the clothes dryer further includes the following steps: If it is determined that the filter screen is not blocked, the filter screen detection indicator light is controlled to display an end state, and the exhaust fan is controlled to stop running; if it is determined that the filter screen is blocked, the filter screen detection indicator light is controlled to display a prompt state.

7. The clothes dryer according to claim 1, characterized in that, The controller further performs the following steps: If it is detected that the door body of the clothes dryer is opened and then closed after the drying program ends, the filter screen detection candidate state is entered after a preset time length is waited. In the filter screen detection candidate state, the temperature value of the heater is detected, and when the temperature value is below a preset temperature value, the filter screen detection program of the clothes dryer is started to be executed.

8. The clothes dryer of claim 1, wherein, The controller further performs the following steps: If it is determined that the filter screen is blocked, a reminder message is generated, and the reminder message is sent to a user terminal bound in advance.

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