Filtering device and clothes drying equipment

Abstract

The utility model provides a filtering device and clothes drying equipment, the filtering device comprises a mounting seat assembly, a filter screen assembly and a cleaning assembly, the mounting seat assembly is provided with a ventilation cavity, a filtering device air inlet and a filtering device air outlet, and the filtering device air inlet and the filtering device air outlet are communicated with the ventilation cavity; the filter screen assembly comprises a first filter screen and a second filter screen; the first filter screen is arranged in the ventilation cavity and is enclosed into a barrel shape; the second filter screen is arranged at the air outlet of the filter device and is a plane filter screen; the first filter screen can filter air in the ventilation cavity, and the second filter screen can filter the air filtered by the first filter screen; the cleaning assembly comprises a cleaning frame, a first cleaning piece and a second cleaning piece, and the cleaning frame is rotatably arranged in the ventilation cavity; the first cleaning piece and the second cleaning piece can respectively clean the first filter screen and the second filter screen when rotating along with the cleaning frame; the cleaning force is improved, the first filter screen and the second filter screen are cleaned more thoroughly, the flowing resistance of drying airflow is reduced, and cleaning is timely.

Description

Technical Field

[0001] This utility model belongs to the field of air treatment technology, and in particular relates to a filtration device and a clothes drying equipment. Background Technology

[0002] When clothes are dried in a dryer, a lot of lint and dust are inevitably generated. If this lint and dust enters other key components of the dryer, it will seriously affect the normal performance of the dryer. Therefore, the filter device is an indispensable part of the dryer, and its main function is to effectively intercept lint and dust, ensuring the cleanliness and stable operation of the dryer's interior.

[0003] However, with continued use of the dryer, the filter gradually becomes clogged with lint and dust, narrowing the airflow path and reducing flow rate. This directly leads to longer drying times and poorer drying performance. Currently, there are two main ways to clean the filter: one is to manually remove it periodically, which requires frequent opening of the dryer to clean the filter, a cumbersome, time-consuming, and laborious process that may result in delayed cleaning; the other is to use self-cleaning components, which can reduce the manual workload to some extent. However, existing self-cleaning components generally lack sufficient cleaning power and are unable to thoroughly remove lint and dust from the filter. Utility Model Content

[0004] In view of this, the present invention provides a filtration device to solve the problems of the prior art, such as the time-consuming and laborious nature of manual cleaning of filtration devices and the tendency for cleaning to be delayed, as well as the insufficient cleaning power of self-cleaning components and the difficulty in thoroughly cleaning filtration devices.

[0005] This utility model provides a filtration device, comprising:

[0006] The mounting base assembly has a filter inlet on one side and a filter outlet on the other side. The interior of the mounting base assembly has a ventilation cavity that connects the filter inlet and the filter outlet.

[0007] A filter assembly includes a first filter and a second filter; the first filter is disposed within the ventilation cavity and is arranged in a cylindrical shape; the second filter is disposed at the air outlet of the filter device and is located at one axial end of the first filter; the first filter is used to filter the air in the ventilation cavity, and the second filter is used to filter the air filtered by the first filter.

[0008] A cleaning assembly includes a cleaning frame, a first cleaning component, and a second cleaning component. The cleaning frame is rotatably disposed within the ventilation cavity. Both the first and second cleaning components are disposed on the cleaning frame, and the cleaning frame, the first cleaning component, and the second cleaning component are rotatable synchronously.

[0009] When the first cleaning component rotates, it can clean the first filter screen; when the second cleaning component rotates, it can clean the second filter screen.

[0010] Further optionally, the first filter screen includes an axial first end and an axial second end disposed opposite to each other; the second filter screen is located at the axial second end;

[0011] The cleaning frame includes a main cleaning frame, a first cleaning bracket, a bracket shaft, and a second cleaning bracket. The main cleaning frame is disposed at the first end of the axial direction. One end of the first cleaning bracket is disposed on the main cleaning frame, and the other end of the first cleaning bracket extends toward the second end of the axial direction. The first cleaning bracket is disposed on the inner or outer side of the first filter screen, and the first cleaning component is disposed on the first cleaning bracket.

[0012] One end of the support shaft is mounted on the main cleaning frame, and the other end of the support shaft is mounted on the second cleaning support, on which the second cleaning component is mounted; the support shaft and the first filter are coaxially mounted and located inside the first filter.

[0013] Further optionally, the first cleaning bracket has a blade structure; the first cleaning bracket can rotate when air flows through it; and / or,

[0014] The second cleaning bracket has a blade structure; the second cleaning bracket can rotate when air flows through it.

[0015] Further optionally, the first filter screen is arranged in a cylindrical shape, and the second filter screen is a circular planar filter screen; the first filter screen and the second filter screen are arranged coaxially;

[0016] The first cleaning bracket extends along the axial direction of the first filter screen and is disposed on the outer side of the first filter screen; multiple first cleaning brackets are provided and are spaced apart along the circumference of the first filter screen; each first cleaning bracket has a first cleaning component disposed on the side facing the first filter screen.

[0017] The second cleaning bracket extends along the diameter or radius of the first filter screen, and the second cleaning component is provided on the side of the second cleaning bracket facing the second filter screen.

[0018] Optionally, the filtration device further includes a debris collection box and a spray assembly; the debris collection box is disposed below the filter assembly, and the spray assembly includes a spray head disposed inside the ventilation cavity, the spray head being able to spray water into the ventilation cavity to flush the lint from the first and second filter screens into the debris collection box.

[0019] Further optionally, the filtration device includes a pre-running filter cleaning program and a post-running water film removal program;

[0020] When the filter device runs the filter cleaning program, the cleaning frame rotates at a first speed, the first cleaning component cleans the first filter, and the second cleaning component cleans the second filter.

[0021] When the filtration device runs the water film removal program, the cleaning frame rotates at a second speed, the first cleaning component removes the water film on the first filter screen, and the second cleaning component removes the water film on the second filter screen.

[0022] Wherein, the first rotational speed is less than the second rotational speed.

[0023] Further optionally, the mounting bracket assembly includes a first mounting bracket and a second mounting bracket spaced apart front to back, with the ventilation cavity formed between the first mounting bracket and the second mounting bracket; the air inlet of the filter device is formed on the left side, right side or top of the ventilation cavity, and the air outlet of the filter device is formed on the second mounting bracket;

[0024] The cleaning frame is rotatably mounted on the first mounting base and located on the side close to the second mounting base;

[0025] The filter assembly further includes a first filter frame and a second filter frame. The first filter frame is disposed on the second mounting base and located inside the ventilation cavity. The first filter frame is cylindrical, and the first filter covers the outer periphery of the first filter frame. The second filter frame is disposed at the air outlet of the filter device, and the second filter covers the second filter frame.

[0026] Optionally, the first mounting base has a shaft hole, which is coaxially arranged with the first filter screen; the cleaning assembly further includes a drive motor, which is mounted on the first mounting base and located on the side away from the second mounting base, and the output shaft of the drive motor passes through the shaft hole and is driven to connect to the main cleaning frame.

[0027] Alternatively, the first mounting base and the second mounting base are connected by a frame, so that the mounting base assembly, the filter assembly and the cleaning assembly are connected together and form a whole.

[0028] This utility model also provides a clothes drying device, including a roller, a front support, and a filter device as described in any one of the above; the front support is disposed in front of the roller, and the front support forms an air outlet duct communicating with the roller; the air outlet duct includes a lower section, the filter assembly and the cleaning assembly are disposed in the lower section of the air outlet duct, the ventilation cavity is connected to the lower section of the air outlet duct, and the filter device is used to filter the drying airflow in the lower section of the air outlet duct.

[0029] Further optionally, an air outlet inlet is formed at the top of the lower section of the air outlet duct, and an air outlet outlet is formed at the rear end of the lower section of the air outlet duct.

[0030] The air inlet of the filter device is connected to the lower section of the air outlet, and the air outlet of the filter device is connected to the lower section of the air outlet.

[0031] Further optionally, the clothes drying equipment also includes a base, on which the roller and the front support are both disposed; and a lint discharge port is formed at the bottom of the lower section of the air outlet.

[0032] The dust collection box of the filter device is disposed on the base and located below the lower section of the air outlet duct. The dust collection box and the lower section of the air outlet duct are connected through the dust discharge port. The spray assembly of the filter device is disposed on the side wall of the lower section of the air outlet duct. The spray head in the spray assembly can spray water to the bottom of the lower section of the air outlet duct to flush the lint from the first and second filter screens into the dust collection box through the dust discharge port.

[0033] Further optionally, the drying equipment also includes a back panel, an air inlet shell, and a two-phase assembly; the back panel is disposed on the base and located behind the roller; the air inlet shell is fastened to the back panel and the air inlet shell and the back panel form an air inlet duct; a rotatable drying fan blade is disposed in the air inlet duct, the drying fan blade being used to provide power to the drying airflow;

[0034] The two-electrode assembly includes a two-electrode box, an evaporator, and a condenser, with the two-electrode box forming a box channel; the evaporator and condenser are disposed within the box channel, the evaporator being used to dehumidify the drying airflow, and the condenser being used to heat the drying airflow;

[0035] The air outlet duct also includes an upper section of the air outlet duct, which is located above the lower section of the air outlet duct. The upper section of the air outlet duct connects the roller and the inlet of the lower section of the air outlet duct, and the upper section and the lower section of the air outlet duct constitute the air outlet duct.

[0036] The air outlet, box channel, air inlet, and drum are connected in sequence to form a drying circuit, in which the drying airflow can circulate.

[0037] Compared with the prior art, the main advantages of this utility model are:

[0038] (1) A two-stage filtration system is formed by a cylindrical first filter and a planar second filter. The first filter is cylindrical and has a large filtration surface area in the ventilation cavity, which can perform large-area preliminary filtration of the air entering the ventilation cavity and effectively intercept most of the larger particles of lint, dust and other impurities. The second filter performs fine filtration of the air after the preliminary filtration of the first filter and further captures the fine residual impurities, thereby ensuring that the air discharged from the air outlet of the filter device has extremely high cleanliness, which effectively ensures the cleanliness and stable operation of the dryer and extends the overall service life of the dryer.

[0039] (2) The first and second cleaning components in the cleaning assembly are designed to correspond to the shape characteristics of the first and second filters, respectively; ensuring that filters of different shapes can be cleaned sufficiently and appropriately, maintaining good filtration performance; realizing the automatic cleaning function of the filters, which greatly saves the user's time and effort compared with the traditional method of manually removing the filters for cleaning periodically, improving the convenience and automation of the dryer, keeping the filters in a good filtration state, thereby stabilizing the flow and quality of the drying airflow and improving the overall working efficiency of the dryer. Attached Figure Description

[0040] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0041] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0042] Figure 1a A schematic diagram of the assembly structure of an embodiment of the filtration device provided by this utility model;

[0043] Figure 1b An exploded structural diagram of an embodiment of the filtration device provided by this utility model;

[0044] Figure 1cA longitudinal sectional view of an embodiment of the filtration device provided by this utility model;

[0045] Figure 1d A cross-sectional view of an embodiment of the filtration device provided by this utility model;

[0046] Figure 1e This is a schematic diagram of the main structure of an embodiment of the filtration device provided by this utility model;

[0047] Figure 1f A top view of an embodiment of the filtration device provided by this utility model;

[0048] Figure 2 A schematic diagram of the assembly structure of the first cleaning component and the first filter screen provided by this utility model;

[0049] Figure 3a This is a schematic diagram of the internal structure of an embodiment of the clothes drying equipment provided by this utility model;

[0050] Figure 3b This is a schematic diagram of the external structure of an embodiment of the clothes drying equipment provided by this utility model;

[0051] Figure 4a and Figure 4b A schematic diagram of the axial sectional structure of an embodiment of the clothes drying equipment provided by this utility model;

[0052] Figure 5a This is a schematic diagram of the assembly structure of an embodiment of the clothes drying equipment provided by this utility model;

[0053] Figure 5b This is an exploded structural diagram of an embodiment of the clothes drying equipment provided by this utility model;

[0054] Figure 5c This is a cross-sectional structural diagram of an embodiment of the clothes drying equipment provided by this utility model;

[0055] Figure 6 A schematic diagram of the front support embodiment provided by this utility model;

[0056] In the picture:

[0057] 11-First mounting base; 111-Shaft hole; 12-Second mounting base; 13-Ventilation cavity; 14-Rib; 141-Rib opening;

[0058] 21-First filter frame; 22-Second filter frame; 23-First filter; 24-Second filter;

[0059] 31-Main cleaning frame; 321-First cleaning bracket; 322-Second cleaning bracket; 33-Bracket shaft; 341-First cleaning component; 342-Second cleaning component; 35-Drive motor;

[0060] 4-Chip collection box; 41-First chip collection cavity; 42-Second chip collection cavity; 431-Left wall of chip collection box; 432-Right wall of chip collection box; 433-Bottom wall of chip collection box; 434-Discharge outlet of chip collection box; 44-Separating rib;

[0061] 5-Spray assembly; 51-Spray head;

[0062] 61-Drum; 611-Drum opening; 612-Rear wall of drum; 613-Drying air inlet; 62-Base; 63-Two-evapor box; 64-Box channel; 651-Evaporator; 652-Condenser;

[0063] 7-Front support; 71-Clothes loading / unloading port; 72-Air outlet; 721-Lower section of air outlet; 722-Upper section of air outlet; 723-Air outlet mounting port; 73-Drying air outlet; 741-First dander discharge port; 742-Second dander discharge port; 751-Upper support shell; 752-Lower support shell;

[0064] 8-Box body; 81-Front panel; 811-Panel opening; 82-Left side panel; 83-Right side panel; 84-Rear panel; 841-Rear panel air vent; 85-Air inlet shell; 851-Air inlet duct; 91-Door; 92-Drying fan blade. Detailed Implementation

[0065] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0066] The terminology used in the embodiments of this utility model is for the purpose of describing particular embodiments only and is not intended to limit the utility model. The singular forms “a,” “said,” and “the” used in the embodiments of this utility model and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise; “multiple” generally includes at least two, but does not exclude the inclusion of at least one.

[0067] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0068] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a product or system comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a product or system. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the product or system that includes said element.

[0069] Existing dryers mainly clean the filter in the air duct through two methods: manual and automatic cleaning. However, manual cleaning requires users to frequently open the dryer and remove the filter for cleaning, which is cumbersome, time-consuming, and laborious, and may result in untimely cleaning. Automatic cleaning generally suffers from insufficient cleaning power and cannot achieve a comprehensive and thorough cleaning.

[0070] This utility model creatively provides a filtration device, including a mounting base assembly, a filter assembly, and a cleaning assembly. The mounting base assembly forms a ventilation cavity and a filter inlet and an air outlet communicating with the ventilation cavity. The filter assembly includes a first filter and a second filter. The first filter is disposed within the ventilation cavity and is arranged in a cylindrical shape. The second filter is disposed at the air outlet of the filter. The first filter can filter the air in the ventilation cavity, and the second filter can filter the air filtered by the first filter. The cleaning assembly includes a cleaning frame, a first cleaning component, and a second cleaning component. When the first cleaning component and the second cleaning component rotate, they can clean the first filter and the second filter respectively.

[0071] It improves cleaning power, making the cleaning of the first and second filters more thorough, reducing the flow resistance of the drying airflow, and ensuring timely cleaning.

[0072] Example 1

[0073] like Figures 1a to 2 As shown, this embodiment provides a filtration device, including:

[0074] The mounting base assembly has a filter inlet on one side and a filter outlet on the other side. The interior of the mounting base assembly has a ventilation cavity 13 that connects the filter inlet and the filter outlet.

[0075] The filter assembly includes a first filter 23 and a second filter 24. The first filter 23 is disposed within the ventilation cavity 13 and is arranged in a cylindrical or arc-shaped form. The second filter 24 is disposed at the air outlet of the filter device and is either a flat or arc-shaped filter, located at one axial end of the first filter 23. The first filter 23 is used to filter the air within the ventilation cavity 13, and the second filter 24 is used to filter the air after it has been filtered by the first filter 23. That is, the air within the ventilation cavity 13 first flows through the first filter 23 and then through the second filter 24.

[0076] The cleaning assembly includes a cleaning frame, a first cleaning component 341, and a second cleaning component 342. The cleaning frame is rotatably disposed within the ventilation cavity 13. The first cleaning component 341 and the second cleaning component 342 are both disposed on the cleaning frame, and the cleaning frame, the first cleaning component 341, and the second cleaning component 342 can rotate synchronously.

[0077] When the first cleaning component 341 rotates, it can clean the first filter screen 23; when the second cleaning component 342 rotates, it can clean the second filter screen 24.

[0078] The specific structure of the cleaning rack is further described below. The first filter 23 includes an axial first end and an axial second end that are arranged opposite to each other; the second filter 24 is located at the axial second end.

[0079] The cleaning frame includes a main cleaning frame 31, a first cleaning bracket 321, a bracket shaft 33, and a second cleaning bracket 322. The main cleaning frame 31 is located at a first axial end. One end of the first cleaning bracket 321 is located on the main cleaning frame 31, and the other end of the first cleaning bracket 321 extends towards a second axial end. The first cleaning bracket 321 is located inside or outside the first filter screen 23, and a first cleaning component 341 is provided on the first cleaning bracket 321. One end of the bracket shaft 33 is located on the main cleaning frame 31, and the other end of the bracket shaft 33 is located on the second cleaning bracket 322, and a second cleaning component 342 is provided on the second cleaning bracket 322. The bracket shaft 33 is located inside the first filter screen 23. The first cleaning bracket 321, the second cleaning bracket 322, and the main cleaning frame 31 can rotate synchronously. When any one of the first cleaning bracket 321, the second cleaning bracket 322, and the main cleaning frame 31 rotates, the other two also rotate.

[0080] Preferably, the first cleaning bracket 321 is disposed on the outside of the first filter screen 23, the first cleaning component 341 is a first brush, and the second cleaning component 342 is a second brush; the end of the first brush near the first filter screen 23 is arc-shaped.

[0081] Furthermore, the first filter screen 23 is arranged in a cylindrical or arc-shaped form, the second filter screen 24 is a circular planar filter screen or the structure of the second filter screen 24 is part of a sphere, and the first brush is arc-shaped; the support shaft 33, the first filter screen 23, the second filter screen 24 and the first brush are arranged coaxially; air enters the ventilation chamber 13 through the air inlet of the filter device, then flows through the first filter screen 23 and the second filter screen 24 in sequence, and is then discharged through the air outlet of the filter device;

[0082] The distance between the first cleaning component 341 and the first filter screen 23 in the radial direction is adjustable; the distance between the second cleaning component 342 and the second filter screen 24 in the axial direction of the first filter screen 23 is adjustable; so that the first cleaning component 341 and the first filter screen 23, as well as the second cleaning component 342 and the second filter screen 24, can fully contact each other, resulting in thorough, comprehensive, and highly efficient cleaning.

[0083] The structure of the first cleaning bracket 321 and the second cleaning bracket 322 is further described below. The first cleaning bracket 321 extends along the axial direction of the first filter screen 23. Multiple first cleaning brackets 321 are provided, and the multiple first cleaning brackets 321 are arranged at intervals along the circumference of the first filter screen 23. Each first cleaning bracket 321 has a first cleaning element 341 on the side facing the first filter screen 23. The first cleaning element 341 is in contact with the first filter screen 23. Preferably, the first cleaning element 341 and the first filter screen 23 are interference-fitted, and the interference amount is between 1mm and 5mm to ensure effective cleaning. Different interference amounts between the first cleaning element 341 and the first filter screen 23 can be designed to achieve different degrees of cleaning.

[0084] The second cleaning bracket 322 extends along the diameter or radius of the first filter screen 23. A second cleaning element 342 is provided on the side of the second cleaning bracket 322 facing the second filter screen 24. The second cleaning element 342 is in contact with the second filter screen 24. Preferably, the second cleaning element 342 and the second filter screen 24 are interference-fitted, with the interference amount between 1mm and 5mm, to ensure effective cleaning. The second cleaning bracket 322 can be designed to be telescopic. When the telescopic amount of the second cleaning bracket 322 is different, the interference amount of the second cleaning element 342 and the second filter screen 24 is different, thereby achieving different degrees of cleaning.

[0085] The density of the second filter screen 24 is greater than or equal to the density of the first filter screen 23 to ensure optimal filtration effect. The first cleaning component 341 and the second cleaning component 342 are not necessarily limited to brushes; they can also be rubber strips or plastic scrapers or other materials that can clean up hair. The brush and the filter screen are set at a certain angle, or the curvature of the brush is consistent with that of the filter screen to maximize the fit of the filter screen and improve cleaning efficiency. The rotation speed of the first cleaning bracket 321 and the second cleaning bracket 322 should not be too high, and the optimal rotation speed is controlled between 5 r / min and 20 r / min.

[0086] The lint that falls off from the first filter screen 23 and the second filter screen 24 will float inside the ventilation cavity 13 or adhere to the side wall communicating with the ventilation cavity 13. The specific method for removing this lint will be further described below. The filtration device also includes a lint collection box 4 and a spray assembly 5. The lint collection box 4 is located below the filter screen assembly. The spray assembly 5 includes a spray head 51, which is located inside the ventilation cavity 13. The spray head 51 can spray fluid into the ventilation cavity 13. The fluid sprayed by the spray head 51 includes at least water. When the spray head 51 sprays water into the ventilation cavity 13, the water comes into contact with the lint, which increases the weight of the lint and causes it to sink downwards, and is then washed into the lint collection box 4.

[0087] After the spray head 51 sprays water into the ventilation chamber 13, a water film easily forms on the first filter screen 23 and the second filter screen 24. The water film affects the flow of the drying airflow. The following is a further explanation of the methods for cleaning the filter screen and removing the water film. The filtration device is equipped with a filter screen cleaning program that runs first and a water film removal program that runs later.

[0088] When the filter device is in the filter cleaning program, the cleaning rack rotates at the first speed, the first cleaning component 341 cleans the first filter 23, and the second cleaning component 342 cleans the second filter 24; the spray head 51 sprays water into the ventilation cavity 13 to wash the lint off the first filter 23 and the second filter 24 into the lint collection box 4.

[0089] When the filtration device is in the water film removal program, the cleaning rack rotates at a second speed. The first cleaning component 341 punctures the water film on the first filter screen 23, and the second cleaning component 342 punctures the water film on the second filter screen 24. Combined with the airflow, the water film evaporates. The first speed is less than the second speed. The first speed is below 30 r / min, and the second speed must reach above 300 r / min.

[0090] The specific structure of the mounting bracket assembly is further described below. The mounting bracket assembly includes a first mounting bracket 11 and a second mounting bracket 12 arranged at a distance from each other. A ventilation cavity 13 is formed between the first mounting bracket 11 and the second mounting bracket 12. An air inlet for a filter device is formed on the left, right, or top side of the ventilation cavity 13, and an air outlet for a filter device is formed on the second mounting bracket 12. Preferably, the air inlet for a filter device is formed on the top side of the ventilation cavity 13. The cleaning main frame 31 is rotatably mounted on the first mounting bracket 11 and located on the side closer to the second mounting bracket 12.

[0091] The filter assembly also includes a first filter frame 21 and a second filter frame 22. The first filter frame 21 is disposed on the second mounting base 12 and located in the ventilation cavity 13. The first filter frame 21 is cylindrical, and the first filter 23 covers the outer periphery of the first filter frame 21. The second filter frame 22 is disposed at the air outlet of the filter device, and the second filter 24 covers the second filter frame 22.

[0092] Furthermore, the first mounting base 11 has a shaft hole 111, which is coaxially arranged with the first filter screen 23; the cleaning assembly also includes a drive motor 35, which is mounted on the first mounting base 11 and located on the side away from the second mounting base 12. The output shaft of the drive motor 35 passes through the shaft hole 111 and is driven to connect with the cleaning main frame 31; when the drive motor 35 is running, the cleaning main frame 31 can rotate with the first cleaning bracket 321, the bracket shaft 33 and the second cleaning bracket 322, thus realizing automatic cleaning of the first filter screen 23 and the second filter screen 24;

[0093] The first mounting base 11, drive motor 35, cleaning main frame 31, first cleaning bracket 321, bracket shaft 33 and second cleaning bracket 322 are assembled together to form a module. The second mounting base 12, first filter frame 21, first filter 23, second filter frame 22 and second filter 24 are assembled together to form another module. The two modules work together to form a filtration device.

[0094] In other embodiments, the first mounting base 11 and the second mounting base 12 are connected by a frame, so that the mounting base assembly, the filter assembly and the cleaning assembly are connected together and form an integral unit. Thus, the mounting base assembly, the filter assembly and the cleaning assembly can be disassembled as a whole, which is convenient and efficient.

[0095] In summary, the filtration device of this application can automatically clean the lint adhering to the filter screen without the need for manual cleaning by the user, saving time and effort; and the spray assembly 5 automatically washes away the lint, causing the lint to collect in the lint collection box 4, and then the lint in the lint collection box 4 is discharged with the water flow, without the need for user cleaning; and prevents the lint that falls off the filter screen from being blown up by the wind during the drying process and re-contaminates the filter screen.

[0096] In addition, the drying equipment also includes a housing, a detection component, and a display panel; the housing has an internal cavity, and the roller 61 and the front support 7 are both located inside the cavity; the housing includes a front panel, which is located in front of the front support 7, and the front panel has a display panel mounting opening; the detection component is located in the lower section 721 of the air outlet duct and is used to detect the amount of lint in the lower section 721 of the air outlet duct; the display panel is located at the display panel mounting opening, and the display panel and the detection component are electrically connected. The display panel can display the amount of lint in the lower section 721 of the air outlet duct, which facilitates timely cleaning of the lint in the lower section 721 of the air outlet duct; depending on actual needs, the display panel can also display the temperature, flow rate, and humidity of the drying airflow passing through the lower section 721 of the air outlet duct.

[0097] Example 2

[0098] Unlike Embodiment 1, this embodiment proposes that the first cleaning bracket 321 has a blade structure; when air flows through the first cleaning bracket 321, the first cleaning bracket 321 can rotate; thus, without the need for an external motor drive, the first cleaning bracket 321 can rotate under the action of the flowing air, thereby the first cleaning component 341 can automatically and promptly clean the lint on the first filter screen 23; and / or, the second cleaning bracket 322 has a blade structure; when air flows through the second cleaning bracket 322, the second cleaning bracket 322 can rotate; thus, without the need for an external motor drive, the second cleaning bracket 322 can rotate under the action of the flowing air, thereby the second cleaning component 342 can automatically and promptly clean the lint on the second filter screen 24.

[0099] Example 3

[0100] Unlike embodiments 1 and 2, this embodiment proposes that both the first cleaning bracket 321 and the first brush are spiral-shaped; or,

[0101] Both the first cleaning bracket 321 and the first brush are zigzag-shaped, and the first cleaning bracket 321 includes a first bracket segment and a second bracket segment arranged sequentially along the axial direction of the bracket shaft 33; the angle between the first bracket segment and the axial direction of the bracket shaft 33 is α, and the angle between the second bracket segment and the axial direction of the bracket shaft 33 is β, where α and β satisfy: α+β=180°;

[0102] The cleaning effect of the first cleaning component 341 can be improved by using the above two methods.

[0103] Example 4

[0104] Based on any one of embodiments 1 to 3, this embodiment proposes that the position of the first cleaning bracket 321 on the cleaning main frame 31 can be adjusted radially along the bracket shaft 33; and / or, the position of the second cleaning bracket 322 on the bracket shaft 33 can be adjusted axially along the bracket shaft 33; the positions of the first cleaning bracket 321 and / or the second cleaning bracket 322 on the bracket shaft 33 can be adjusted according to actual needs to improve the cleaning force of the first cleaning component 341 and the second cleaning component 342 and expand the applicable range of the first cleaning component 341 and the second cleaning component 342; or,

[0105] A first elastic element connects the first cleaning bracket 321 and the first cleaning component 341; under the action of the first elastic element, the first cleaning component 341 and the first filter screen 23 are always in contact, improving the cleaning effect; a second elastic element connects the second cleaning bracket 322 and the second cleaning component 342; under the action of the second elastic element, the second cleaning component 342 and the second filter screen 24 are always in contact, improving the cleaning effect.

[0106] Example 5

[0107] Based on any one of embodiments 1 to 4, this embodiment proposes that, along the circumference of the support shaft 33, a detachable first dust collection box is provided on one or both sides of the first cleaning support 321, the first dust collection box being used to suck up the lint that falls off the first filter screen 23; along the circumference of the support shaft 33, a detachable second dust collection box is provided on one or both sides of the second cleaning support 322, the second dust collection box being used to suck up the lint that falls off the second filter screen 24.

[0108] Example 6

[0109] Based on any one of embodiments 1 to 5, this embodiment proposes that the first filter screen frame 21 is rotatably disposed on the second mounting base 12, and the first mounting base 11 is formed with a mounting hole; the filter device further includes a knob and a transmission assembly, the knob is rotatably disposed at the mounting hole and located on the side of the first mounting base 11 away from the second mounting base 12; the knob and the first filter screen frame 21 are connected by transmission assembly.

[0110] By rotating the knob, the transmission assembly rotates the first filter frame 21 and the first filter 23 as a whole, thereby causing different circumferential parts of the first filter 23 to face the lower inlet of the air outlet duct. Depending on the degree of clogging in different circumferential parts of the first filter 23, the rotation causes the heavily clogged parts to move away from the lower inlet of the air outlet duct, while the unclogged parts move closer to it. This fully utilizes different circumferential parts of the first filter 23 for filtration, extending its service life and improving its filtration efficiency. It also facilitates the removal of lint from the first filter 23.

[0111] Specifically, the transmission assembly includes a rack, a gear, and a connecting rod. The rack is arc-shaped or ring-shaped and is coaxially arranged and connected with the first filter screen frame 21. Both the rack and the gear are rotatably mounted on the second mounting base 12, and the gear and the rack mesh. One end of the connecting rod is connected to a knob, and the other end is connected to a gear. When the knob is turned, the connecting rod drives the gear to rotate, which in turn causes the rack to drive the first filter screen frame 21 and the first filter screen 23 to rotate as a whole.

[0112] In addition, the second filter frame 22 and the first filter frame 21 can be designed to be detachably connected. The second filter frame 22 and the second filter 24 can rotate with the first filter frame. By adjusting the filtration part of the second filter 24, the filtration effect of the second filter 24 can be improved, and at the same time, it is beneficial for the shedding of lint on the second filter 24.

[0113] Example 7

[0114] like Figure 4bAs shown, based on any one of embodiments 1 to 6, this embodiment proposes that a first chip discharge port 741 and a second chip discharge port 742 are formed at the bottom of the lower section 721 of the air outlet. The first chip discharge port 741 is located below the first filter screen 23, and the second chip discharge port 742 is located below the second filter screen 24.

[0115] The dust collection box 4 is located below the lower section 721 of the air outlet duct. The dust collection box 4 has a first dust collection chamber 41 and a second dust collection chamber 42 that are not connected to each other. The first dust collection chamber 41 is connected to the first dust discharge port 741 and is used to collect the lint that falls off the first filter screen 23 and is discharged through the first dust discharge port 741. The second dust collection chamber 42 is connected to the second dust discharge port 742 and is used to collect the lint that falls off the second filter screen 24 and is discharged through the second dust discharge port 742.

[0116] The first filter 23 and the second filter 24 have independent chip discharge ports and chip collection chambers, which avoids the problem of short circuit in the air path and allows the first filter 23 to fully perform its function.

[0117] The specific structure of the chip collection box 4 is further described below. The chip collection box 4 includes a left wall 431, a right wall 432, and a bottom wall 433. The left wall 431 and the right wall 432 are arranged opposite to each other. The bottom wall 433 connects the left wall 431 and the right wall 432. The left wall 431 forms a chip collection box discharge outlet 434. The bottom wall 433 is inclined from the right wall 432 toward the left wall 431.

[0118] The inside of the chip collection box 4 is provided with a partition rib 44, which divides the inside of the chip collection box 4 into a first chip collection cavity 41 and a second chip collection cavity 42. Both the first chip collection cavity 41 and the second chip collection cavity 42 are connected to the chip collection box outlet 434 for discharging the lint in the first chip collection cavity 41 and the second chip collection cavity 42.

[0119] In addition, the filtration device includes a first spray assembly and a second spray assembly. The first spray assembly includes a first spray head, which is disposed in the lower section 721 of the air outlet duct and is used to flush the lint that falls off the first filter screen 23 into the first lint collection chamber 41.

[0120] The second spray assembly includes a second spray head, which is disposed in the second chip collection chamber 42 and is used to flush out the lint in the second chip collection chamber 42.

[0121] The first and second spray heads can be connected via a T-junction to share a single water inlet pipe, or they can be connected independently to their respective water inlet pipes to enhance the spraying effect of the spray head 51.

[0122] Furthermore, the lower section 721 of the air outlet includes a left wall and a right wall of the lower section of the air outlet arranged opposite to each other; the first spray head 51 is disposed on the left wall of the lower section of the air outlet; the first chip discharge port 741 is closer to the right wall of the lower section of the air outlet than the left wall of the lower section of the air outlet.

[0123] The second mounting base 12 is provided with a baffle 14, which surrounds the second filter screen 24 and forms a baffle opening 141 at the bottom of the baffle 14. The baffle opening 141 is in a corresponding position to and connected to the second chip discharge port 742, and is used to discharge the lint that falls off the second filter screen 24 to the second chip discharge port 742.

[0124] The sealing structure of the chip collection box is further explained below. The front support 7 forms a receiving cavity below the lower section 721 of the air outlet; or, both the roller 61 and the front support 7 are mounted on the base 62, and the base 62 forms a receiving cavity below the lower section 721 of the air outlet.

[0125] The chip collection box 4 is disposed inside the receiving cavity; a labyrinth-type sealing structure is formed between the end of the chip collection box 4 near the top wall of the receiving cavity and the top wall of the receiving cavity, and between the end of the partition rib 44 near the top wall of the receiving cavity and the top wall of the receiving cavity, to increase the sealing effect between the chip collection box 4 and the top wall of the receiving cavity, and between the partition rib 44 and the top wall of the receiving cavity, and to prevent the drying airflow from flowing between the first chip collection cavity 41 and the second chip collection cavity 42.

[0126] Example 8

[0127] like Figures 3a to 6 As shown, this embodiment provides a clothes drying device, including a drum 61, a front support 7, and a filter device according to any one of embodiments 1 to 7; the drum 61 includes a drum opening 611 and a rear wall 612 arranged opposite to each other, and the rear wall 612 forms a drying air inlet 613; the front support 7 is disposed in front of the drum 61, and the front support 7 forms a clothes loading and unloading port 71 communicating with the drum opening 611, and the side wall of the clothes loading and unloading port 71 forms a drying air outlet 73 communicating with the clothes loading and unloading port 71, and the front support 7 is located at the drying air outlet 73. Below 3, an air outlet 72 is formed that communicates with the drying air outlet 73; the air outlet 72 includes a lower section 721, a filter assembly and a cleaning assembly are disposed in the lower section 721, the ventilation cavity 13 is connected to the lower section 721, and the filter device is used to filter the drying airflow in the lower section 721; specifically, the front support 7 includes an upper support shell 751 and a lower support shell 752 disposed opposite to each other, the upper support shell 751 forms a clothing loading and unloading port 71, and the lower support shell 752 forms an air outlet 72.

[0128] Furthermore, an air outlet mounting port 723 is formed at the front end of the lower section 721, an air outlet inlet is formed at the top of the lower section 721, and an air outlet outlet is formed at the rear end of the lower section 721; a first mounting base 11 is detachably disposed at the air outlet mounting port 723, and a second mounting base 12 is detachably disposed at the air outlet outlet; a filter assembly and a cleaning assembly are detachably disposed within the lower section 721 through the air outlet mounting port 723, and the filter assembly is disposed in the air path between the air outlet inlet and the air outlet outlet;

[0129] Specifically, the air inlet of the filter device is connected to the lower section inlet of the air outlet, and the air outlet of the filter device is connected to the lower section outlet of the air outlet; the first filter screen 23 is located below the lower section inlet of the air outlet, and the second filter screen 24 is located at the lower section outlet of the air outlet; the first filter screen 23 is used to filter the drying airflow entering the lower section 721 of the air outlet from the lower section inlet, and the second filter screen 24 is used to filter the drying airflow after being filtered by the first filter screen 23; the cleaning main frame 31 is located near the air outlet mounting port 723; one end of the first cleaning bracket 321 is located on the cleaning main frame 31 and the other end of the first cleaning bracket 321 extends towards the lower section outlet of the air outlet.

[0130] The following further describes other components of the drying equipment. The drying equipment also includes a base 62, a roller 61 and a front support 7, all of which are mounted on the base 62. A chip discharge port is formed at the bottom of the lower section 721 of the air outlet. The width of the chip discharge port is less than 30 mm and the length is less than 80 mm, so as to prevent the drying airflow from entering the chip collection box 4 and to blow the lint in the chip collection box 4 back to the filter screen.

[0131] The dust collection box 4 of the filter device is located below the lower section 721 of the air outlet duct, and the dust collection box 4 and the lower section 721 of the air outlet duct are connected through the dust discharge port; the spray assembly 5 of the filter device is located on the side wall of the lower section 721 of the air outlet duct, and the spray head 51 can spray water towards the bottom of the lower section 721 of the air outlet duct to flush the lint that falls off the first filter screen 23 and the second filter screen 24 into the dust collection box 4 through the dust discharge port; specifically, the spray assembly 5 is located on the left or right side wall of the lower section 721 of the air outlet duct; preferably, the spray assembly 5 is located on the left side wall of the lower section 721 of the air outlet duct.

[0132] Furthermore, the clothes drying equipment also includes a housing 8, an air inlet shell 85, and a two-piece assembly; the housing 8 includes a front panel 81, a left side panel 82, a right side panel 83, and a rear panel 84, with the front panel 81 and rear panel 84 arranged opposite each other front to back, and the left side panel 82 and right side panel 83 arranged opposite each other left to right; the front panel 81, left side panel 82, right side panel 83, and rear panel 84 together form a housing cavity, and the base 62, roller 61, front support 7, two-piece box 63, and two-piece assembly are all disposed within the housing cavity; the front panel 81 forms a... The panel opening 811 corresponds to and is connected to the clothing loading / unloading opening 71; the back panel 84 is located behind the roller 61; the air inlet shell 85 is fastened to the back panel 84 and the air inlet shell 85 and the back panel 84 form an air inlet duct 851, the back panel 84 forms a back panel air passage 841, the air inlet duct 851 and the drying air inlet 613 are connected through the back panel air passage 841; a rotatable drying fan blade 92 is provided in the air inlet duct 851, the drying fan blade 92 is used to provide power to the drying airflow;

[0133] The two-electrode assembly includes a two-electrode box 63, an evaporator 651, and a condenser 652. The two-electrode box 63 forms a box channel 64. The evaporator 651 and the condenser 652 are disposed in the box channel 64. The evaporator 651 is used to dehumidify the drying airflow, and the condenser 652 is used to heat the drying airflow.

[0134] The air outlet 72 also includes an upper section 722 of the air outlet, which is located above the lower section 721 of the air outlet. The upper section 722 of the air outlet connects the drying air outlet 73 and the inlet of the lower section of the air outlet, and the upper section 722 of the air outlet and the lower section 721 of the air outlet constitute the air outlet 72.

[0135] The air outlet duct 72, the box passage 64, the air inlet duct 851, and the drum 61 are connected in sequence to form a drying circuit, in which the drying airflow can circulate. Under the action of the drying fan blades 92, the drying airflow can circulate in the drying flow path. When the drying airflow flows through the drum 61, it exchanges heat with the clothes in the drum 61 and removes the moisture from the clothes. When the drying airflow flows through the evaporator 651, the evaporator 651 dehumidifies the drying airflow. When the drying airflow flows through the condenser 652, the condenser 652 heats the drying airflow.

[0136] Exemplary embodiments of this disclosure have been specifically shown and described above. It should be understood that this disclosure is not limited to the detailed structures, arrangements, or implementations described herein; rather, this disclosure is intended to cover various modifications and equivalent arrangements contained within the spirit and scope of the appended claims.

Claims

1. A filtration device, characterized in that, include: The mounting base assembly has a filter inlet on one side and a filter outlet on the other side. The interior of the mounting base assembly has a ventilation cavity (13) that connects the filter inlet and the filter outlet. A filter assembly includes a first filter (23) and a second filter (24); the first filter (23) is disposed within the ventilation cavity (13) and is arranged in a cylindrical shape; the second filter (24) is disposed at the air outlet of the filter device and is located at one axial end of the first filter (23); the first filter (23) is used to filter the air in the ventilation cavity (13), and the second filter (24) is used to filter the air filtered by the first filter (23); The cleaning assembly includes a cleaning frame, a first cleaning component (341), and a second cleaning component (342), wherein the cleaning frame is rotatably disposed within the ventilation cavity (13); the first cleaning component (341) and the second cleaning component (342) are both disposed on the cleaning frame and the cleaning frame, the first cleaning component (341), and the second cleaning component (342) can rotate synchronously; When the first cleaning component (341) rotates, it can clean the first filter screen (23); when the second cleaning component (342) rotates, it can clean the second filter screen (24).

2. The filtration device according to claim 1, characterized in that, The first filter screen (23) includes an axial first end and an axial second end disposed opposite to each other; the second filter screen (24) is located at the axial second end; The cleaning frame includes a main cleaning frame (31), a first cleaning bracket (321), a bracket shaft (33), and a second cleaning bracket (322). The main cleaning frame (31) is disposed at the first axial end. One end of the first cleaning bracket (321) is disposed on the main cleaning frame (31), and the other end of the first cleaning bracket (321) extends toward the second axial end. The first cleaning bracket (321) is disposed on the inner or outer side of the first filter screen (23), and the first cleaning component (341) is disposed on the first cleaning bracket (321). One end of the bracket shaft (33) is disposed on the main cleaning frame (31), and the other end of the bracket shaft (33) is disposed on the second cleaning bracket (322), and the second cleaning component (342) is disposed on the second cleaning bracket (322); the bracket shaft (33) and the first filter screen (23) are coaxially disposed and located inside the first filter screen (23).

3. The filtration device according to claim 2, characterized in that, The first cleaning bracket (321) has a blade structure; the first cleaning bracket (321) can rotate when air flows through it; and / or, The second cleaning bracket (322) has a blade structure; the second cleaning bracket (322) can rotate when air flows through it.

4. The filtration device according to claim 2, characterized in that, The first filter screen (23) is arranged in a cylindrical shape, and the second filter screen (24) is a circular planar filter screen; the first filter screen (23) and the second filter screen (24) are arranged coaxially; The first cleaning bracket (321) extends along the axial direction of the first filter screen (23) and is disposed on the outer side of the first filter screen (23); multiple first cleaning brackets (321) are provided and are spaced apart circumferentially along the first filter screen (23); each first cleaning bracket (321) has a first cleaning component (341) disposed on the side facing the first filter screen (23); The second cleaning bracket (322) extends along the diameter or radius of the first filter (23), and the second cleaning component (342) is provided on the side of the second cleaning bracket (322) facing the second filter (24).

5. The filtration device according to claim 1, characterized in that, The filtration device further includes a chip collection box (4) and a spray assembly (5); the chip collection box (4) is disposed below the filter assembly, and the spray assembly (5) includes a spray head (51) disposed inside the ventilation chamber (13); the spray head (51) can spray water into the ventilation chamber (13) to flush the lint that has fallen off the first filter screen (23) and the second filter screen (24) into the chip collection box (4).

6. The filtration device according to claim 5, characterized in that, The filtration device is equipped with a filter cleaning program that runs first and a water film removal program that runs later. When the filter device runs the filter cleaning program, the cleaning frame rotates at a first rotation speed, the first cleaning component (341) cleans the first filter (23), and the second cleaning component (342) cleans the second filter (24); When the filtration device runs the water film removal program, the cleaning rack rotates at a second rotation speed, the first cleaning component (341) removes the water film on the first filter screen (23), and the second cleaning component (342) removes the water film on the second filter screen (24); Wherein, the first rotational speed is less than the second rotational speed.

7. The filtration device according to claim 2, characterized in that, The mounting bracket assembly includes a first mounting bracket (11) and a second mounting bracket (12) spaced apart from each other, with the ventilation cavity (13) formed between the first mounting bracket (11) and the second mounting bracket (12); the air inlet of the filter device is formed on the left side, right side or top of the ventilation cavity (13), and the air outlet of the filter device is formed on the second mounting bracket (12). The cleaning main frame (31) is rotatably mounted on the first mounting base (11) and located on the side close to the second mounting base (12); The filter assembly further includes a first filter frame (21) and a second filter frame (22). The first filter frame (21) is disposed on the second mounting base (12) and located inside the ventilation cavity (13). The first filter frame (21) is cylindrical, and the first filter (23) covers the outer periphery of the first filter frame (21). The second filter frame (22) is disposed at the air outlet of the filter device, and the second filter (24) covers the second filter frame (22).

8. The filtration device according to claim 7, characterized in that, The first mounting base (11) has a shaft hole (111) and the shaft hole (111) and the first filter screen (23) are coaxially arranged; the cleaning assembly also includes a drive motor (35), the drive motor (35) is arranged on the first mounting base (11) and located on the side away from the second mounting base (12), and the output shaft of the drive motor (35) passes through the shaft hole (111) and is driven to connect with the cleaning main frame (31).

9. The filtration device according to claim 7, characterized in that, The first mounting base (11) and the second mounting base (12) are connected by a frame, so that the mounting base assembly, the filter assembly and the cleaning assembly are connected together and form a whole.

10. A clothes drying device, characterized in that, The drying equipment includes a drum (61), a front support (7), and a filter device according to any one of claims 1 to 9; the front support (7) is disposed in front of the drum (61), and the front support (7) forms an air outlet duct (72) communicating with the drum (61); the air outlet duct (72) includes a lower section (721), the filter assembly and the cleaning assembly are disposed in the lower section (721), the ventilation cavity (13) is connected to the lower section (721), and the filter device is used to filter the drying airflow in the lower section (721).

11. The clothes drying device according to claim 10, characterized in that, The lower section of the air outlet (721) has an air outlet inlet at its top and an air outlet outlet at its rear end. The air inlet of the filter device is connected to the lower section of the air outlet, and the air outlet of the filter device is connected to the lower section of the air outlet.

12. The clothes drying equipment according to claim 10, characterized in that, The clothes drying equipment also includes a base (62), and the roller (61) and the front support (7) are both disposed on the base (62); a chip discharge port is formed at the bottom of the lower section (721) of the air outlet; The dust collection box (4) of the filter device is disposed on the base (62) and located below the lower section (721) of the air outlet. The dust collection box (4) and the lower section (721) of the air outlet are connected through the dust discharge port. The spray assembly (5) of the filter device is disposed on the side wall of the lower section (721). The spray head (51) in the spray assembly (5) can spray water to the bottom of the lower section (721) of the air outlet to flush the lint that falls off the first filter screen (23) and the second filter screen (24) into the dust collection box (4) through the dust discharge port.

13. The clothes drying device according to claim 12, characterized in that, The drying equipment also includes a back panel (84), an air inlet shell (85), and a two-piece assembly; the back panel (84) is disposed on the base (62) and located behind the roller (61); the air inlet shell (85) is fastened to the back panel (84), and the air inlet shell (85) and the back panel (84) form an air inlet duct (851); a rotatable drying fan blade (92) is disposed inside the air inlet duct (851), and the drying fan blade (92) is used to provide power to the drying airflow; The two-electrode assembly includes a two-electrode box (63), an evaporator (651), and a condenser (652). The two-electrode box (63) forms a box channel (64). The evaporator (651) and the condenser (652) are disposed in the box channel (64). The evaporator (651) is used to dehumidify the drying airflow, and the condenser (652) is used to heat the drying airflow. The air outlet duct (72) also includes an upper section of the air outlet duct, which is located above the lower section of the air outlet duct (721). The upper section of the air outlet duct connects the roller (61) and the inlet of the lower section of the air outlet duct, and the upper section of the air outlet duct and the lower section of the air outlet duct (721) constitute the air outlet duct (72). The air outlet (72), box channel (64), air inlet (851) and drum (61) are connected in sequence to form a drying circuit, in which the drying airflow can circulate.

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