Fans and Fan Self-Cleaning Methods

Abstract

This invention discloses a fan and a self-cleaning method for the fan, belonging to the field of wind power equipment. The fan has a housing with a receiving cavity, an air inlet, and an air outlet. The fan assembly includes a coaxially connected drive motor and impeller. The fan assembly is located in the receiving cavity; an air inlet plate assembly is located at the air inlet and spaced apart from a dust filter; an air outlet plate assembly is located at the air outlet; and the dust filter is located between the sides of the air inlet plate assembly and the impeller. The air inlet plate assembly includes an air inlet cover that can open or close the air inlet; the air outlet plate assembly includes an air outlet cover that can open or close the air outlet; a second dust bin has a second dust collection hole, and the bottom of the air inlet housing and the dust filter is located at the second dust collection hole. This fan can perform self-cleaning, simplifying dust removal operations and improving dust removal efficiency.

Description

Technical Field

[0001] This invention relates to the field of wind power equipment, and particularly to fans and fan self-cleaning methods. Background Technology

[0002] A fan is a type of air supply device. Low-speed airflow enters from the inlet side of the fan, and after being processed by the rotating impeller, it forms a high-speed airflow that is discharged from the outlet side.

[0003] In related technologies, the fan has a filter inside to block dust in the incoming airflow. This causes dust to accumulate on the filter after the fan has been used for a period of time. Cleaning the filter usually requires disassembling the fan to manually clean it, which makes the cleaning operation complicated and the cleaning efficiency low. Summary of the Invention

[0004] In view of this, the present invention provides a fan and a fan self-cleaning method, which can solve the problem of complicated fan cleaning operations.

[0005] Specifically, the following technical solutions are included:

[0006] On one hand, a fan is provided, the fan comprising: a housing, an air inlet plate assembly, an air outlet plate assembly, a dust filter, a second dust chamber, and a fan assembly;

[0007] The housing has a receiving cavity, an air inlet and an air outlet, and the fan assembly includes a drive motor and an impeller connected to each other;

[0008] The fan assembly is located in the receiving cavity, the air inlet plate assembly is located at the air inlet and is spaced apart from the dust filter, the air outlet plate assembly is located at the air outlet, and the dust filter is located between the air inlet plate assembly and the side of the impeller;

[0009] The air inlet assembly includes an air inlet cover, which is configured to be movable to open or close the air inlet.

[0010] The air outlet assembly includes an air outlet cover, which is configured to be movable to open or close the air outlet.

[0011] The second dust chamber has a second dust collection hole, and the bottom of the air inlet cover and the dust filter screen are located at the second dust collection hole.

[0012] In some possible implementations, the fan further includes a first dust chamber located below the impeller, the first dust chamber being used to collect impurities mixed in with the airflow output by the impeller.

[0013] In some possible implementations, the air inlet assembly further includes an air inlet shroud with a perforated structure, the air inlet cover being fitted to the outer surface of the air inlet shroud facing away from the dust filter.

[0014] The air outlet assembly also includes an air outlet cover with a perforated structure, the air outlet cover being attached to the outer surface of the air outlet cover opposite to the housing.

[0015] In some possible implementations, the air inlet cover is hinged to the air inlet housing to open or close the air inlet by rotation; and / or,

[0016] The air outlet cover is hinged to the air outlet housing so that the air outlet can be opened or closed by rotation.

[0017] In some possible implementations, the fan includes an impeller-reversing self-cleaning mode, which includes: the air inlet cover closing the air inlet, the air outlet cover closing the air outlet, and the impeller being in a reverse-rotation state, and...

[0018] The fan includes a forward-rotating self-cleaning mode, which includes: the air inlet cover closing the air inlet, the air outlet cover closing the air outlet, and the impeller being in a forward-rotating state.

[0019] In some possible implementations, the dustproof net is arranged vertically, and the dustproof net includes an upper region and a lower region distributed sequentially in the vertical direction. The upper region and the lower region are superimposed to cover the entire surface of the dustproof net.

[0020] When the impeller is in reverse, it can clean at least the upper area of ​​the dust filter.

[0021] When the impeller is rotating in the forward direction, it can at least clean the lower area of ​​the dust filter.

[0022] In some possible implementations, the impeller includes a plurality of blades arranged sequentially along the circumferential direction;

[0023] In the impeller reverse state, the plurality of blades are configured such that the angle between the air outlet direction of the air outlet end of the plurality of blades and the dust filter is 45° to 135°, so that the airflow output by the impeller can come into contact with the upper area of ​​the dust filter to achieve cleaning.

[0024] When the impeller is rotating forward, the multiple blades are configured such that the angle between the air outlet direction of the multiple blades and the dust filter is 45° to 135°, so that the airflow output by the impeller can come into contact with the lower area of ​​the dust filter to achieve cleaning.

[0025] In some possible implementations, the fan further includes a controller configured to control the operating states of the impeller, the inlet cover, and the outlet cover, such that the impeller is in a forward or reverse rotation state, and that the inlet is opened or closed, and that the outlet is opened or closed.

[0026] In some possible implementations, the distance between the air inlet cover and the dust filter screen ranges from 3mm to 16mm; and / or,

[0027] The distance between the air inlet cover and the dust filter gradually increases from the top to the bottom of the air inlet cover and the dust filter.

[0028] On the other hand, a fan self-cleaning method is provided, which is applied to any of the fans described above, and the fan self-cleaning method includes:

[0029] The air inlet is closed by the air inlet cover, and the air outlet is closed by the air outlet cover, and the impeller is reversed, so that the fan performs an impeller reverse self-cleaning mode.

[0030] The air inlet is closed by the air inlet cover, and the air outlet is closed by the air outlet cover, and the impeller is in a forward rotation state, and the fan executes the impeller forward rotation self-purification mode.

[0031] In some possible implementations, when the fan performs the impeller reverse self-cleaning mode, the impeller speed is at least twice the maximum speed corresponding to the normal operating mode of the fan.

[0032] In some possible implementations, when the fan performs the impeller forward rotation self-cleaning mode, the impeller speed is at least 1.5 times the maximum speed corresponding to the normal operation mode of the fan.

[0033] In some possible implementations, the fan self-cleaning method includes at least one round of cleaning operations, each round of cleaning operations including one impeller reverse self-cleaning mode and one impeller forward self-cleaning mode performed sequentially.

[0034] In some possible implementations, the ratio of the running time of the impeller reverse rotation self-cleaning mode to that of the impeller forward rotation self-cleaning mode is 1:1 to 1.5.

[0035] In some possible implementations, when the fan performs the impeller reversing self-cleaning mode, the angle between the airflow direction from the upper impeller portion of the impeller and the dust filter is in the range of 45° to 135°.

[0036] When the fan operates in the impeller forward rotation self-cleaning mode, the angle between the airflow direction from the lower impeller and the dust filter is in the range of 45° to 135°.

[0037] The beneficial effects of the technical solutions provided in the embodiments of the present invention include at least the following:

[0038] The fan provided in this embodiment of the invention adapts to switching between different modes by configuring the air inlet cover to be movable to open or close the air inlet, and the air outlet cover to be movable to open or close the air outlet. When the fan is in normal airflow mode, the air inlet cover is moved to open the air inlet, and the air outlet cover is moved to open the air outlet. In normal airflow mode, the dust filter blocks dust from the incoming airflow, reducing the amount of dust and other impurities carried by the incoming airflow. This causes dust to accumulate on the dust filter after the fan has been used for a period of time. When the fan is in impeller reverse self-cleaning mode, the air inlet cover closes the air inlet, the air outlet cover closes the air outlet, and the impeller is in reverse rotation. This impeller reversal cleans at least the upper area of ​​the dust filter. When the fan is in the impeller-rotating self-cleaning mode, the air inlet cover closes the air inlet, the air outlet cover closes the air outlet, and the impeller rotates forward. This forward rotation of the impeller ensures that at least the lower area of ​​the dust filter is cleaned. Therefore, this design enables the fan provided in this embodiment of the invention to clean the surface of the dust filter, achieving self-cleaning, thus simplifying dust removal operations and improving dust removal efficiency. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1 A diagram of a fan assembly provided in an embodiment of the present invention;

[0041] Figure 2 An exploded view of a fan provided in an embodiment of the present invention;

[0042] Figure 3 A cross-sectional view of a fan provided in an embodiment of the present invention;

[0043] Figure 4 This is a schematic diagram of the structure of the first dust chamber and the second dust chamber provided in an embodiment of the present invention;

[0044] Figure 5This is a partial enlarged view of the first dust bin provided in an embodiment of the present invention;

[0045] Figure 6 This is a partial enlarged view of the second dust bin provided in an embodiment of the present invention;

[0046] Figure 7 A schematic diagram of an exemplary fan in normal air supply mode provided in an embodiment of the present invention;

[0047] Figure 8 A schematic diagram of an exemplary fan in impeller reverse self-cleaning mode provided for an embodiment of the present invention;

[0048] Figure 9 A schematic diagram of the state of an exemplary fan in the impeller forward rotation self-cleaning mode provided in an embodiment of the present invention;

[0049] Figure 10 This is an exemplary distribution diagram showing the relationship between the distance between the air inlet cover and the dust filter and the instantaneous blowing speed of dust particles under different wind speeds, provided as an embodiment of the present invention.

[0050] The reference numerals in the attached figures represent:

[0051] 1. Shell;

[0052] 11. Receptacle; 12. Air inlet; 13. Air outlet;

[0053] 2. Air inlet panel assembly; 21. Air inlet cover; 22. Air inlet cover plate; 210. Dust collection plate;

[0054] 3. Air outlet panel assembly; 31. Air outlet cover; 32. Air outlet cover plate;

[0055] 4. Dust filter net;

[0056] 5. First dust bin;

[0057] 51. Top warehouse wall; 52. First side warehouse wall; 53. Bottom warehouse wall; 54. Second side warehouse wall;

[0058] 55. First dust collection hole; 56. Airflow buffer zone;

[0059] 6. Drive motor;

[0060] 7. Impeller; 70. Blade; 701. Upper impeller section; 702. Lower impeller section;

[0061] 8. Second dust bin;

[0062] 81. Second dust collection hole; 811. First gap section; 812. Second gap section; 813. Third gap section.

[0063] The accompanying drawings have illustrated specific embodiments of the invention, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the invention in any way, but rather to illustrate the concept of the invention to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0064] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0065] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. When the product is placed in different postures, the orientation may change; for example, "upper" and "lower" may be interchanged.

[0066] On one hand, embodiments of the present invention provide a fan, as shown in the attached figure. Figure 1 and attached Figure 2 As shown, the fan includes: a housing 1, an inlet plate assembly 2, an outlet plate assembly 3, a dust filter 4, a second dust chamber 8, and a fan assembly. The housing 1 has a receiving cavity 11, an air inlet 12, and an air outlet 13. The fan assembly includes a drive motor 6 and an impeller 7 connected to each other. The fan assembly is located in the receiving cavity 11, the inlet plate assembly 2 is located at the air inlet 12 and is spaced apart from the dust filter 4, the outlet plate assembly 3 is located at the air outlet 13, and the dust filter 4 is located between the sides of the inlet plate assembly 2 and the impeller 7.

[0067] The air inlet plate assembly 2 includes an air inlet cover 22, which is configured to be movable to open or close the air inlet 12; the air outlet plate assembly 3 includes an air outlet cover 32, which is configured to be movable to open or close the air outlet 13; the second dust bin 8 has a second dust collection hole 81, and the bottom of the air inlet cover 22 and the dust filter 4 are located at the second dust collection hole 81.

[0068] The fan provided in this embodiment of the invention adapts to switching between different fan modes by configuring the air inlet cover 22 to be movable to open or close the air inlet 12, and the air outlet cover 32 to be movable to open or close the air outlet 13. (See attached image) Figure 7 As shown, when the fan is in normal airflow mode, the air inlet cover 22 moves to open the air inlet 12, and the air outlet cover 32 moves to open the air outlet 13. When the fan is in normal airflow mode, the dust filter 4 blocks dust from the incoming airflow, reducing the amount of dust and other impurities carried by the airflow. This causes dust to accumulate on the dust filter 4 after the fan has been used for a period of time. (See attached image) Figure 8 As shown, when the fan is in the impeller reverse self-cleaning mode, the air inlet cover 22 closes the air inlet 12, the air outlet cover 32 closes the air outlet 13, and the impeller 7 is in reverse rotation. This reverse rotation of the impeller 7 effectively cleans at least the upper area of ​​the dust filter 4. (See attached image) Figure 9 As shown, when the fan is in the impeller-rotating self-cleaning mode, the air inlet cover 22 closes the air inlet 12, the air outlet cover 32 closes the air outlet 13, and the impeller 7 rotates forward. Thus, the forward rotation of the impeller 7 can at least clean the lower area of ​​the dust filter 4. It is evident that this design enables the fan provided in this embodiment of the invention to clean the surface of the dust filter 4, achieving self-cleaning, thereby simplifying dust removal operations and improving dust removal efficiency.

[0069] Understandably, both the air inlet cover 22 and the air outlet cover 32 are closed plate structures to ensure effective sealing of the air inlet 12 and the air outlet 13. In this way, when the fan is in self-cleaning mode, the entire internal cavity is sealed to ensure that dust and other impurities will not spread outside the cavity during the purification process and cause secondary pollution.

[0070] In some examples, as shown in the appendix Figure 2 As shown, the fan provided in this embodiment of the invention also includes a first dust chamber 5, which is located below the impeller 7 and is used to collect impurities mixed in with the airflow output by the impeller 7.

[0071] Since a first dust chamber 5 is provided below the impeller 7, a local gap cavity is formed between the impeller 7 and the first dust chamber 5. The high-speed airflow will be depressurized and decelerated in this local gap cavity to increase the density of dust and other impurities carried in the airflow. This promotes the probability that dust and other impurities are collected by the first dust chamber 5, thus realizing the collection of dust and other impurities carried in the airflow by the first dust chamber 5.

[0072] In some examples, as shown in the appendix Figure 2 As shown, the air inlet plate assembly 2 also includes an air inlet cover 21 with a perforated structure, and an air inlet cover 22 is attached to the outer surface of the air inlet cover 21 that is away from the dust filter 4.

[0073] The air outlet assembly 3 also includes an air outlet cover 31 with a perforated structure, and an air outlet cover 32 is attached to the outer surface of the air outlet cover 31 that is away from the housing 1.

[0074] Both the air inlet shroud 21 and the air outlet shroud 31 have perforated structures that allow airflow. For example, the air inlet shroud 21 can be in the form of a grid plate or a perforated plate. For a grid plate, it has multiple evenly distributed grid holes. For a perforated plate, it has holes of shapes such as circles, ellipses, rectangles, rhombuses, and hexagons. For example, the air inlet shroud 21 can be made using grid plates of common specifications in the art.

[0075] The hole structure on the air outlet cover 31 can be either completely hollow or in the form of a grid. The completely hollow hole structure allows the hole size to be large enough to obtain a larger air volume and the air speed will not be slowed down by the air outlet cover 31.

[0076] With the above settings, the air inlet cover 21 and the air outlet cover 31 can, while ensuring smooth airflow from the fan, also block the airflow entering the fan and the airflow exiting the fan to a certain extent, reducing the amount of dust and other impurities carried by the airflow entering the fan and further improving the cleanliness of the airflow exiting the fan.

[0077] In some examples, embodiments of the present invention provide such a fan, as shown in the attached figure. Figure 1 - Appendix Figure 2 As shown, the fan includes a housing 1, an air inlet plate assembly 2, an air outlet plate assembly 3, a dust filter 4, a first dust chamber 5, a second dust chamber 8, and a fan assembly. The housing 1 has a receiving cavity 11, an air inlet 12, and an air outlet 13, and the fan assembly includes a drive motor 6 and an impeller 7 connected together (for example, the output shaft of the drive motor 6 is coaxially connected to the rotating shaft of the impeller 7).

[0078] The fan assembly is located in the accommodating cavity 11, the air inlet plate assembly 2 is located in the air inlet 12 and is spaced apart from the dust filter 4, the air outlet plate assembly 3 is located in the air outlet 13, and the dust filter 4 is located between the air inlet plate assembly 2 and the side of the impeller 7; the first dust bin 5 is located below the impeller 7 and is used to collect impurities mixed in the airflow output by the impeller 7.

[0079] As attached Figure 2 As shown, the air inlet plate assembly 2 includes an air inlet cover 21 and an air inlet cover 22. The air inlet cover 22 is attached to the outer surface of the air inlet cover 21 facing away from the dust filter 4, and the air inlet cover 22 is configured to be movable to open or close the air inlet 12.

[0080] The air outlet assembly 3 includes an air outlet housing 31 and an air outlet cover 32. The air outlet cover 32 is attached to the outer surface of the air outlet housing 31 facing away from the housing 1, and the air outlet cover 32 is configured to be movable to open or close the air outlet 13.

[0081] Further details are attached. Figure 3 and attached Figure 4 As shown, the second dust chamber 8 has a second dust collection hole 81, and the bottom of the air inlet cover 21 and the dust filter screen 4 are located at the second dust collection hole 81.

[0082] The fan with the above-mentioned structural arrangement can at least achieve the purification of the exhaust airflow and the self-cleaning of the dust filter 4.

[0083] Regarding the purification of the exhaust airflow, in this embodiment of the invention, the impeller 7 is built into the receiving cavity 11 of the housing 1. An air inlet plate assembly 2 and a dust filter 4 are arranged at intervals at the air inlet 12 of the impeller 7 to provide two layers of dust blocking for the incoming airflow, reducing the amount of dust and other impurities carried by the incoming airflow. The incoming airflow is accelerated by the impeller 7 to form a high-speed airflow. Since a first dust chamber 5 is provided below the impeller 7, a local gap cavity is formed between the impeller 7 and the first dust chamber 5. The high-speed airflow experiences pressure and speed reduction in this local gap cavity, increasing the density of dust and other impurities carried in the airflow. This promotes the probability of dust and other impurities being collected by the first dust chamber 5, thus achieving the collection of dust and other impurities carried in the airflow by the first dust chamber 5. A second dust chamber 8 collects dust adhering to the air inlet cover 21 and the dust filter 4, as well as dust in the gap between the air inlet cover 21 and the dust filter 4, to prevent dust from falling into the outside and being recirculated into the fan. This design significantly reduces the deposition of dust and other impurities on the impeller 7, enabling the fan to circulate clean airflow.

[0084] Regarding the self-cleaning of the dust filter 4, this embodiment of the invention includes an air inlet plate assembly 2 comprising an air inlet cover 21 and an air inlet cover 22, wherein the air inlet cover 22 is configured to be movable to open or close the air inlet 12. Furthermore, the air outlet plate assembly 3 includes an air outlet cover 31 and an air outlet cover 32, wherein the air outlet cover 32 is configured to be movable to open or close the air outlet 13, thereby adapting to the switching of the fan in different modes.

[0085] As attached Figure 7 As shown, when the fan is in normal airflow mode, the air inlet cover 22 moves to open the air inlet 12, and the air outlet cover 32 moves to open the air outlet 13. When the fan is in normal airflow mode, the dust filter 4 blocks dust from the incoming airflow, reducing the amount of dust and other impurities carried by the airflow. This causes dust to accumulate on the dust filter 4 after the fan has been used for a period of time. (See attached image) Figure 8As shown, when the fan is in the impeller reverse self-cleaning mode, the air inlet cover 22 closes the air inlet 12, the air outlet cover 32 closes the air outlet 13, and the impeller 7 is in reverse rotation. This reverse rotation of the impeller 7 effectively cleans at least the upper area of ​​the dust filter 4. (See attached image) Figure 9 As shown, when the fan is in the impeller-rotating self-cleaning mode, the air inlet cover 22 closes the air inlet 12, the air outlet cover 32 closes the air outlet 13, and the impeller 7 rotates forward. Thus, the forward rotation of the impeller 7 can at least clean the lower area of ​​the dust filter 4. It is evident that this design enables the fan provided in this embodiment of the invention to clean the surface of the dust filter 4, achieving self-cleaning, thereby simplifying dust removal operations and improving dust removal efficiency.

[0086] In this embodiment of the invention, the air inlet cover 22 and the air outlet cover 32 are movable to close or open the corresponding air inlet 12 and air outlet 13. The movable modes of the air inlet cover 22 and the air outlet cover 32 include, but are not limited to, the following:

[0087] Firstly, the air inlet cover 22 and the air inlet housing 21 are detachably connected, and the air outlet cover 32 and the air outlet housing 31 are detachably connected, including but not limited to: screw connection, snap-fit, riveting, etc.

[0088] Secondly, the air inlet cover 22 is hinged to the air inlet housing 21 so as to open or close the air inlet 12 by rotation; and / or, the air outlet cover 32 is hinged to the air outlet housing 31 so as to open or close the air outlet 13 by rotation.

[0089] By making the air inlet cover 22 and / or the air outlet cover 32 rotatable, at least the following advantages are achieved: it makes the operation of opening and closing the corresponding air vents of the air inlet cover 22 and / or the air outlet cover 32 easier, and the air inlet cover 22 and / or the air outlet cover 32 is less likely to be lost; it makes the operation of opening and closing the corresponding air vents of the air inlet cover 22 and / or the air outlet cover 32 easier to design as controllable, so as to facilitate electronic control.

[0090] In this embodiment of the invention, the fan's self-cleaning modes include an impeller reverse rotation self-cleaning mode and an impeller forward rotation self-cleaning mode.

[0091] See Figure 8 In the impeller reverse self-purification mode, the air inlet cover 22 closes the air inlet 12, the air outlet cover 32 closes the air outlet 13, and the impeller 7 is in reverse.

[0092] See Figure 9 In the self-purification mode of impeller forward rotation, the air inlet cover 22 closes the air inlet 12, the air outlet cover 32 closes the air outlet 13, and the impeller 7 is in the forward rotation state.

[0093] In the impeller reverse self-cleaning mode, at least the upper area of ​​the dust filter 4 can be cleaned. In the impeller forward self-cleaning mode, at least the lower area of ​​the dust filter 4 can be cleaned, thus achieving effective cleaning of the entire surface of the dust filter 4.

[0094] As attached Figure 3 As shown, the dust-proof net 4 is arranged vertically and includes an upper region and a lower region that are distributed sequentially in the vertical direction. The upper region and the lower region are superimposed to cover the entire surface of the dust-proof net 4.

[0095] In other words, in this embodiment of the invention, the "upper region of the dust-proof net 4" refers not only to the upper region of the dust-proof net 4 in a strict sense, but also includes the region between the top and middle of the dust-proof net 4, and may even further include some regions of the dust-proof net 4 located below the middle. Similarly, the "lower region of the dust-proof net 4" refers not only to the lower region of the dust-proof net 4 in a strict sense, but also includes the region between the bottom and middle of the dust-proof net 4, and may even further include some regions of the dust-proof net 4 located above the middle. Thus, the combined area of ​​the upper and lower regions of the dust-proof net 4 is greater than or equal to the total surface area of ​​the dust-proof net 4.

[0096] When impeller 7 is in reverse rotation, it can clean at least the upper area of ​​dust filter 4. When impeller 7 is in forward rotation, it can clean at least the lower area of ​​dust filter 4.

[0097] See Figure 8 When impeller 7 is in reverse, it can clean at least the upper area of ​​dust filter 4, including:

[0098] Because the air inlet cover 22 closes the air inlet 12 and the air outlet cover 32 closes the air outlet 13, the fan's inner cavity is sealed, and the airflow can only circulate within this sealed inner cavity. See also Figure 8 As can be seen, when the impeller 7 reverses, the airflow from the impeller 7 mainly flows towards the upper area of ​​the dust filter screen 4. The airflow in the upper area of ​​the dust filter screen 4 flows outward, impacting the air inlet cover 22 and causing its flow velocity to decrease significantly. Then, it moves downward along the air inlet cover 22 and is driven back to the impeller 7 by the lower circulating airflow. In this way, through this airflow circulation path, dust and other impurities in the upper area of ​​the dust filter screen 4 are blown away from the upper part of the dust filter screen 4 and fall downward into the second dust bin 8.

[0099] See Figure 9 When impeller 7 is rotating forward, it can clean at least the lower area of ​​dust filter 4, including:

[0100] Because the air inlet cover 22 closes the air inlet 12 and the air outlet cover 32 closes the air outlet 13, the fan's inner cavity is sealed, and the airflow can only circulate within this sealed inner cavity. See also Figure 9 As can be seen, when the impeller 7 rotates clockwise, the airflow from the impeller 7 mainly flows towards the lower region of the dust filter 4. The airflow in the lower region of the dust filter 4 flows outward, impacting the air inlet cover 22, causing its flow velocity to decrease significantly. Then, it moves upward along the air inlet cover 22 and is driven back to the impeller 7 by the upper circulating airflow. In this way, through this airflow circulation path, dust and other impurities in the lower region of the dust filter 4 are blown away from the lower region of the dust filter 4 and fall downward into the second dust bin 8.

[0101] As attached Figure 7 - Appendix Figure 9 As shown, the impeller 7 includes a plurality of blades 70 arranged sequentially along the circumferential direction. See also Figure 8 In the impeller's reverse rotation state, multiple blades 70 are configured such that the angle between the airflow outlet direction of the multiple blades 70 and the dust filter 4 is 45° to 135°, allowing the airflow output by the impeller 7 to contact the upper area of ​​the dust filter 4 for cleaning. See also Figure 9 When the impeller is rotating forward, multiple blades 70 are configured such that the angle between the air outlet direction of the multiple blades 70 and the dust filter 4 is 45° to 135°, so that the airflow output by the impeller 7 can come into contact with the lower area of ​​the dust filter 4 to achieve cleaning.

[0102] See Figure 7 It can be seen that the impeller 7 is divided into an upper impeller portion 701 and a lower impeller portion 702 in the vertical direction. It can be understood that the upper impeller portion 701 and the lower impeller portion 702 can be interchanged when the impeller 7 is rotating. The present invention aims to point out that when the impeller 7 is in a certain stationary state, it can be divided into upper and lower parts in the vertical direction.

[0103] As attached Figure 7 As shown, the upper impeller portion 701 and the lower impeller portion 702 can intersect at their junction, and they are not strictly independent parts.

[0104] See Figure 8 When the impeller is in reverse rotation, the angle between the air outlet direction of the multiple blades 70 included in the upper impeller 701 and the dust filter 4 is 45° to 135°, so that the airflow output by the upper impeller 701 can come into contact with the upper area of ​​the dust filter 4 to achieve cleaning.

[0105] When the fan is in the impeller reverse self-cleaning mode, the airflow from the impeller 7 mainly flows towards the upper area of ​​the dust filter 4. For the airflow in contact with the dust filter 4, the angle between the airflow at different positions along the top-to-bottom direction and the corresponding position of the dust filter 4 gradually decreases.

[0106] In other words, when the impeller is in reverse rotation, among the multiple blades 70 included in the upper impeller section 701, the angle between the air outlet direction of the blade 70 and the dust filter screen 4 gradually decreases in the direction from top to bottom.

[0107] See Figure 9 When the impeller is rotating in the forward direction, the angle between the air outlet direction of the multiple blades 70 included in the lower impeller 701 and the dust filter 4 is 45° to 135°, so that the airflow output by the lower impeller 702 can come into contact with the upper area of ​​the dust filter 4 to achieve cleaning.

[0108] When the fan is in the impeller forward rotation self-cleaning mode, the airflow from the impeller 7 mainly flows towards the lower area of ​​the dust filter 4. For the airflow in contact with the dust filter 4, the angle between the airflow at different positions along the top-to-bottom direction and the corresponding position of the dust filter 4 gradually decreases.

[0109] In other words, when the impeller is rotating forward, among the multiple blades 70 included in the upper impeller section 701, the angle between the air outlet direction of the blade 70 and the dust filter screen 4 gradually decreases in the direction from top to bottom.

[0110] In this embodiment of the invention, the angle between the air outlet direction of the multiple blades 70 and the dust filter 4 is 45° to 135°, including but not limited to: 45° to 120°, 45° to 110°, 45° to 90°, 50° to 90°, 60° to 90°, etc. For example, it can be 45°, 50°, 55°, 60°, 65°, 70°, 75°, 80°, 85°, 90°, etc.

[0111] As can be seen, through the above arrangement, the fan provided in this embodiment of the invention can self-clean the entire surface of the dust filter 4, thereby improving the purification effect.

[0112] In some implementations, the fan provided in this embodiment of the invention further includes a controller. The controller is configured to control the operating state of the impeller 7, the air inlet cover 22, and the air outlet cover 32, so that the impeller 7 is in a forward or reverse rotation state, and that the air inlet 12 is opened or closed, and that the air outlet 13 is opened or closed. By setting the controller, the fan's self-cleaning is made more intelligent, further improving the dust removal effect, ensuring that the dust filter 4 is always clean, and ensuring the cleanliness of the incoming air.

[0113] When controlling the operating states of the air inlet cover 22 and the air outlet cover 32, the controller can, for example, arrange a latch and an unlocker on each of the air inlet cover 22 and the air outlet cover 32. The latch is used to keep the air inlet cover 22 and the air inlet housing 21 in a hinged state, and to keep the air outlet cover 32 and the air outlet housing 31 in a hinged state. The unlocker is electrically connected to the controller, and the controller sends an unlocking command to the unlocker. The unlocker triggers the latch to unlock, thereby releasing the hinged state of the air inlet cover 22 and the air inlet housing 21, and the air outlet cover 32 and the air outlet housing 31. The unlocker can, for example, be a resilient unlocking structure.

[0114] In some implementations, the fan provided in this embodiment of the invention further includes a dust level detector, which is electrically connected to the controller and configured to detect dust thickness data on the dust filter 4. Correspondingly, the controller is also configured to receive the dust thickness data and compare it with a thickness threshold. When the dust thickness data reaches the thickness threshold, the controller executes a self-cleaning command to control the operating status of the impeller 7, the inlet cover 22, and the outlet cover 32.

[0115] Tests have confirmed that as the distance between the air inlet cover 22 and the dust filter 4 increases, the instantaneous velocity of dust particles blown off the dust filter 4 also increases. For example, Figure 10 The effect of the distance between the air inlet cover 22 and the dust filter 4 on the instantaneous blowing speed of dust particles under different wind speeds was illustrated, which confirms the above conclusion.

[0116] Figure 10 The relationship between the data shown can be found in Table 1. As can be seen from Table 1, when the wind speed on one side of the surface of the dust filter 4 is 3 m / s or 4 m / s, the minimum distance between the air inlet cover 22 and the dust filter 4 is 3 mm, which can effectively blow the dust away from the dust filter 4. As the distance between the air inlet cover 22 and the dust filter 4 gradually increases, the instantaneous blowing speed of the dust gradually increases, and reaches its maximum at the bottom of the dust filter 4.

[0117] Table 1

[0118]

[0119] Based on this, the distance between the air inlet cover 22 and the dust filter 4 is in the range of 3mm to 16mm, for example, including but not limited to: 3mm to 15mm, 3mm to 14mm, 3mm to 13mm, 3mm to 12mm, 3mm to 11mm, etc.; and / or, the distance gradually increases from the top of the air inlet cover 22 and the dust filter 4 to the bottom of the air inlet cover 22 and the dust filter 4.

[0120] For example, the distance between the top of the air inlet cover 22 and the top of the dust filter 4 can be 3mm, the distance between the bottom of the air inlet cover 22 and the bottom of the dust filter 4 can be 16mm, the distance between the non-end position of the air inlet cover 22 and the non-end position of the dust filter 4 can be between 3mm and 16mm, and gradually increase from top to bottom.

[0121] By arranging the spacing between the air inlet cover 22 and the dust filter 4 as described above, it is ensured that dust on the entire surface of the dust filter 4 can be effectively blown off. The dust moves downwards during fall, and the aforementioned spacing arrangement causes the dust blowing speed to gradually increase from top to bottom. This also prevents dust from overlapping and remaining on the dust filter 4, as the lower part of the dust filter 4 is more likely to be contaminated by the blown-off dust compared to its upper part. Furthermore, the aforementioned spacing arrangement ensures that dust and other impurities, after leaving the dust filter 4, can fall smoothly into the second dust chamber 8 under gravity, reducing the chance of contaminating the dust filter 4 during the fall.

[0122] The spacing between the air inlet cover 22 and the dust filter 4 is set as described above, so that the high-speed dust entering the small space between the air inlet cover 22 and the dust filter 4 will slow down, achieving effective speed attenuation. In addition, it ensures that dust and other impurities can fall into the second dust chamber 8 under the action of gravity after leaving the dust filter 4, achieving excellent dust removal effect.

[0123] The structure and function of each component in the fan involved in the embodiments of the present invention are described by way of example:

[0124] In some examples, the fan provided in the embodiments of the present invention is a cross-flow fan, which is in the shape of a tower column, a cylinder, a rectangular cylinder, etc. Correspondingly, the airflow channel inside the accommodating cavity 11 of the housing 1 is a cross-flow air duct. When the fan is a cross-flow fan, it also has the advantage of hiding the blades of the impeller 7, which is more conducive to reducing the deposition of dust and other impurities on the impeller 7.

[0125] The first dust chamber 5 is positioned below the impeller 7, facilitating its location in a windward position. In some examples, such as the attached diagram... Figure 4 As shown, the first dust bin 5 includes: a top bin wall 51, a first side bin wall 52, a bottom bin wall 53, and a second side bin wall 54 connected end to end; wherein, further combined with Figure 5 It is known that the top wall 51 has a first dust collection hole 55, which is connected to the inner cavity of the first dust collection chamber 5.

[0126] The top chamber wall 51 is located below the impeller 7. After the high-speed airflow is depressurized and decelerated in the gap cavity between the top chamber wall 51 and the impeller 7, the depressurized and decelerated airflow contacts the top chamber wall 51 during the circulation process. The dust and other impurities carried therein are collected into the inner cavity of the first dust chamber 5 by the first dust collection hole 55.

[0127] In some examples, the top surface of the top wall 51 facing the impeller 7 has a windward zone, and the first dust collection hole 55 is located in the windward zone. The windward zone can come into contact with the airflow, and the windward zone has a larger airflow contact area to facilitate the collection of dust and other impurities.

[0128] Combination Figure 3 For example, if the circulating airflow circulates in a clockwise direction, the windward zone is located at the rear end of the top wall 51, which extends in a clockwise direction.

[0129] For example, Figure 4 and Figure 5 The example illustrates that the top wall 51 is an arc-shaped wall. For instance, the arc of the arc-shaped wall is along the direction of airflow circulation. Thus, for the first end and the second end of the arc-shaped wall along the direction of airflow circulation, the first end is located diagonally above the second end. The windward area can be closer to the first end of the arc-shaped wall. In other words, the windward area is set at the position of the arc-shaped wall near the first end, rather than at the position of the arc-shaped wall near the second end. This helps to increase the contact area between the windward area and the airflow.

[0130] In some examples, the first dust chamber 5 extends along the length of the impeller 7. For example, its top chamber wall 51 is arranged along the length of the impeller 7, and the length of the top chamber wall 51 may be the same as the length of the impeller 7. Alternatively, the length of the top chamber wall 51 may be less than the length of the impeller 7, for example, it may be arranged only below a portion of the bottom wall of the impeller 7 to accommodate the relatively compact space inside the receiving cavity 11. Accordingly, the number of first dust collection holes 55 can be designed to be multiple, and multiple first dust collection holes 55 extend along the length of the impeller 7.

[0131] For example, Figure 5 As an example, multiple first dust collection holes 55 are arranged at intervals in the windward area of ​​the top wall 51, and the multiple first dust collection holes 55 are evenly distributed at intervals along the length direction of the impeller 7.

[0132] In some examples, the structure of the first dust collection hole 55 includes, but is not limited to, circular, elliptical, rectangular, hexagonal, etc. For example, the first dust collection hole 55 is rectangular, and the rectangular length direction of the first dust collection hole 55 is along the circulation direction of the airflow in order to pick up more dust.

[0133] Based on the above structure of the first dust chamber 5, it can be seen that there is an eccentric vortex between the top wall 51 of the first dust chamber 5 and the bottom of the impeller 7, which causes the high-speed airflow to continuously pass through the local gap cavity. The high-speed airflow is depressurized and decelerated at the location of the local gap cavity. The first dust collection hole 55 is set in the windward area of ​​the top wall 51. In this way, the depressurized and decelerated airflow generates local leakage flow at the first dust collection hole 55, and the density of dust in the airflow is increased. Under the action of gravity, the dust enters the dust chamber through the first dust collection hole 55.

[0134] The distance between the top wall 51 of the first dust chamber 5 and the bottom of the impeller 7 can be adjusted according to the specific specifications and type of the fan. In some examples, the distance can be 5mm to 10mm, such as including but not limited to 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, etc.

[0135] Furthermore, as shown in the appendix Figure 5 As shown, an airflow buffer zone 56 is provided in the inner cavity of the first dust chamber 5. Figure 5 The area enclosed by the elliptical frame in the image (the airflow buffer zone 56) allows the airflow entering through the first dust collection hole 55 to move a set distance along the direction of inertia.

[0136] For example, the airflow buffer zone 56 is formed at the connection between the top chamber wall 51 and the first side chamber wall 52. The shape of the area where the connection is located is adapted to the shape of the airflow trajectory. In this way, after the airflow carrying a large number of impurities enters the inner cavity of the first dust chamber 5 through the first dust collection hole 55, it continues to move along its inertial direction in the airflow buffer zone 56 until it touches the wall of the airflow buffer zone 56 and loses speed, which promotes the dust to fall in the first dust chamber 5 and fall onto the bottom chamber wall 53 of the first dust chamber 5, thereby achieving dust collection.

[0137] By setting an airflow buffer zone 56 along the direction of the incoming airflow, it is possible to prevent dust entering the first dust chamber 5 from being blown out again, effectively reducing the probability of airflow back flowing out of the first dust collection hole 55 in the first dust chamber 5. The bottom chamber wall 53 is fixed inside the receiving cavity 11 of the housing 1 to receive the deposited dust.

[0138] The bottom wall 53 can be designed to be relatively small, for example, it can be located only between the first side wall 52 and the second side wall 54. Alternatively, the bottom wall 53 can be designed to be relatively large, so that the bottom wall 53 can also be used to support the second dust bin 8 described below (see Figure 4 (This example illustrates that the bottom silo wall 53 is designed as a large-volume support plate).

[0139] The structure of the housing 1 and the arrangement of the impeller 7 therein are determined according to the type of fan. Taking the cross-flow fan provided in this embodiment of the invention as an example, the attached... Figure 2An example of the structure of housing 1 is shown in [reference]. Figure 2 The shell 1 has a rectangular cylindrical structure.

[0140] For housing 1, its air inlet 12 and air outlet 13 are located in different positions. Taking the fan provided in this embodiment of the invention as an example, which is a cross-flow fan, the attached... Figure 2 The example shows an air inlet 12 located on one side of the housing 1, with the air inlet 12 being a fully open arrangement; (See attached image) Figure 2 The example also shows that the air outlet 13 is located at the bottom of the housing 1. The air outlet 13 can be arranged in a semi-open manner, which helps to concentrate the airflow.

[0141] In some examples, the housing 1 includes: a top plate, a first side plate, and a bottom plate connected end-to-end, and a first end plate and a second end plate located between the top plate and the bottom plate. These plates cooperate to form a receiving cavity 11 of the housing 1, and the bottom plate has a perforated area to serve as an air outlet 13. For example, see attached... Figure 2 The example shows that the accommodating cavity 11 of the housing 1 is a rectangular cavity.

[0142] Taking the fan provided in this embodiment of the invention as an example of a cross-flow fan, the impeller 7 can be multi-bladed, long cylindrical, and has forward-curved multi-blade fan blades.

[0143] When the impeller 7 rotates, the incoming airflow enters the blade grid from the open part of the impeller 7, passes through the interior of the impeller 7, and is discharged into the volute from the other side of the blade grid, forming a working airflow, which causes the output end of the impeller 7 to generate a streamlined circular airflow.

[0144] Impeller 7 is coaxially connected to drive motor 6, which is also called drive motor. Driven by drive motor 6, impeller 7 rotates.

[0145] The dust-proof mesh 4 can be any form of dust-proof structure with dense mesh common in the art. In some examples, the mesh size of the dust-proof mesh 4 can be 800 mesh to 200 mesh, and further, it can be 600 mesh to 300 mesh, in order to improve the dust blocking rate.

[0146] In some examples, the wall thickness of the dust filter 4 is 0.5mm to 1.2mm, such as 0.8mm, 0.9mm, 1mm, 1.1mm, etc., in order to minimize the occupation of the internal space of the accommodating cavity 11.

[0147] The dust filter 4 is placed vertically so that after the dust leaves the dust filter 4, it falls into the second dust chamber 8 under the action of gravity.

[0148] In some examples, as shown in the appendix Figure 6As shown, the bottom of the air inlet hood 21 has a dust collection plate 210, wherein the dust collection plate 210 is connected to the inner side of the bottom of the air inlet hood 21. The second dust collection hole 81 includes: a first gap section 811, a second gap section 812 and a third gap section 813; the first gap section 811 is formed between the corresponding sides of the air inlet hood 21 and the second dust bin 8; the second gap section 812 is formed between the corresponding sides of the dust filter 4 and the second dust bin 8; and the third gap section 813 is formed between the dust collection plate 210 and the dust filter 4.

[0149] The first gap section 811 collects dust adhering to the outside of the air inlet cover 21, the second gap section 812 collects dust adhering to the inside of the dust filter 4, and the third gap section 813 collects dust located between the air inlet cover 21 and the dust filter 4. This structure of the second dust collection hole 81 can fully and completely collect the dust isolated on the air inlet side of the fan.

[0150] Furthermore, in order to ensure sufficient collection of dust from the fan inlet side and to avoid the second dust chamber 8 being too large and affecting the compact arrangement of the fan, in this embodiment of the invention, the width of the second dust collection hole 81 satisfies the following condition: A≥1.05×(H1+H2); where A is the width of the second dust collection hole 81; H1 is the bottom distance between the dust filter 4 and the air inlet cover 21, that is, the distance between the bottom of the dust filter 4 and the bottom of the air inlet cover 21; H2 is the sum of the wall thicknesses of the dust filter 4 and the air inlet cover 21.

[0151] In some examples, the second dust chamber 8 includes a top chamber plate, a first side chamber plate, a bottom chamber plate, and a second side chamber plate connected in sequence, wherein the top baffle and the top of the second side chamber plate cooperate to form the second dust drop hole 81, and the bottom chamber plate is used to receive falling dust.

[0152] Furthermore, the first and second side panels can be arranged vertically, and the top panel can be arranged horizontally.

[0153] As attached Figure 6 As shown, the bottom wall of the second dust bin 8 is arranged at an angle, such that one end of the bottom wall of the second dust bin 8 is below the other end. The bottom wall of the second dust bin 8 mentioned here is the bottom bin plate mentioned above.

[0154] In some examples, the inclined arrangement of the bottom wall is such that the end of the bottom wall of the second dust bin 8 closer to the fan assembly is located below, while the end farther from the fan assembly is located above.

[0155] By arranging the bottom wall of the second dust chamber 8 at an angle, the dust collected by the bottom wall of the second dust chamber 8 can fall smoothly into the deeper and innerr part of the second dust chamber 8. In this way, the dust will be further away from the air inlet 12 of the housing 1, thereby effectively preventing the collected dust from being carried out by the return airflow and causing secondary pollution.

[0156] As mentioned above, the air inlet shroud 21 and the dust filter 4 are spaced at a certain interval. In some examples, this is combined with... Figure 7 The length L of the air inlet 12 in The length L of the air outlet 13 out Meets the following conditions: 2.5L out <L in <2.8L out Furthermore, the included angle α between the central axis of the air inlet 12 and the central axis of the air outlet 13 satisfies the following condition: 25° < α < 90°.

[0157] Understandably, combined Figure 7 It can be seen that the air inlet 12 of the casing 1 is not completely vertical, but is arranged at a certain angle, and the air outlet 13 of the casing 1 is not completely horizontal, but is arranged at a certain angle.

[0158] By setting the parameters as described above, it can be ensured that the incoming airflow from the air inlet 12 is fully utilized, effectively avoiding local backflow of diffused air and effectively preventing the airflow from being blocked and unable to perform its due function, thus achieving the goal of making the incoming airflow fully and efficiently utilized.

[0159] In summary, the fan provided in this embodiment of the invention effectively isolates, collects, and sucks in dust and dirt, thereby achieving the goal of cleaning the circulating airflow.

[0160] On the other hand, embodiments of the present invention provide a fan self-cleaning method, which is applied to any of the above-mentioned fans, and the fan self-cleaning method includes:

[0161] The air inlet cover 22 is used to close the air inlet 12, and the air outlet cover 32 is used to close the air outlet 13, and the impeller 7 is put in reverse, so that the fan performs the impeller reverse self-purification mode.

[0162] The air inlet cover 22 is used to close the air inlet 12, and the air outlet cover 32 is used to close the air outlet 13, and the impeller 7 is in a forward rotation state, and the fan executes the impeller forward rotation self-purification mode.

[0163] See Figure 8 In the impeller reverse self-purification mode, the air inlet cover 22 closes the air inlet 12, the air outlet cover 32 closes the air outlet 13, and the impeller 7 is in reverse.

[0164] Because the air inlet cover 22 closes the air inlet 12 and the air outlet cover 32 closes the air outlet 13, the fan's inner cavity is sealed, and the airflow can only circulate within this sealed inner cavity. See also Figure 8 As can be seen, when the impeller 7 reverses, the airflow from the impeller 7 mainly flows towards the upper area of ​​the dust filter screen 4. The airflow in the upper area of ​​the dust filter screen 4 flows outward, impacting the air inlet cover 22 and causing its flow velocity to decrease significantly. Then, it moves downward along the air inlet cover 22 and is driven back to the impeller 7 by the lower circulating airflow. In this way, through this airflow circulation path, dust and other impurities in the upper area of ​​the dust filter screen 4 are blown away from the upper area of ​​the dust filter screen 4 and fall downward into the second dust bin 8.

[0165] See Figure 9 In the self-purification mode of impeller forward rotation, the air inlet cover 22 closes the air inlet 12, the air outlet cover 32 closes the air outlet 13, and the impeller 7 is in the forward rotation state.

[0166] Because the air inlet cover 22 closes the air inlet 12 and the air outlet cover 32 closes the air outlet 13, the fan's inner cavity is sealed, and the airflow can only circulate within this sealed inner cavity. See also Figure 9 As can be seen, when the impeller 7 rotates clockwise, the airflow from the impeller 7 mainly flows towards the lower region of the dust filter 4. The airflow in the lower region of the dust filter 4 flows outward, impacting the air inlet cover 22, causing its flow velocity to decrease significantly. Then, it moves upward along the air inlet cover 22 and is driven back to the impeller 7 by the upper circulating airflow. In this way, through this airflow circulation path, dust and other impurities in the lower region of the dust filter 4 are blown away from the lower region of the dust filter 4 and fall downward into the second dust bin 8.

[0167] In some examples, when the fan operates in impeller reverse self-cleaning mode, the impeller 7 rotates at least twice the maximum speed corresponding to the fan's normal operating mode, for example, 2 times, 2.5 times, 3 times, 4 times, 5 times, etc. This ensures that the airflow above the dust filter 4 flows rapidly out of the cavity, thereby quickly and effectively blowing the dust off the surface of the dust filter 4.

[0168] In some examples, when the fan operates in the impeller-forward self-cleaning mode, the impeller 7 rotates at least 1.5 times the maximum speed corresponding to the fan's normal operating mode, such as 2 times, 2.5 times, 3 times, 4 times, etc. This ensures that the airflow under the dust filter 4 flows rapidly out of the cavity, thereby quickly and effectively blowing the dust off the surface of the dust filter 4.

[0169] In some examples, the fan self-cleaning method provided in the embodiments of the present invention includes at least one round of purification operation, each round of purification operation including one impeller reverse self-cleaning mode and one impeller forward self-cleaning mode performed in sequence.

[0170] In other words, the purification operation can be carried out in 1, 2, 3, 4, 5, 6 or more rounds to improve the purification and dust removal effect.

[0171] During each round of purification, the impeller reverse rotation self-purification mode and the impeller forward rotation self-purification mode are executed in turn in sequence.

[0172] In this way, the impeller reverse self-cleaning mode can clean the upper area of ​​the dust filter 4, and the impeller forward self-cleaning mode can clean the lower area of ​​the dust filter 4. When cleaning the dust on the surface of the upper area of ​​the dust filter 4, a small amount of dust may fall and stick to the lower area of ​​the dust filter 4. Therefore, the impeller reverse self-cleaning mode precedes the impeller forward self-cleaning mode to prevent the problem of dust from being left to accumulate on both the upper and lower parts of the dust filter 4.

[0173] In some examples, the ratio of the running time of the impeller reverse self-cleaning mode to that of the impeller forward self-cleaning mode is 1:1-1.5, for example, including but not limited to: 1:1, 1:1.1, 1:1.2, 1:1.3, 1:1.4, 1:1.5, etc.

[0174] By making the running time of the impeller forward rotation self-cleaning mode slightly longer than that of the impeller reverse rotation self-cleaning mode, the purification effect of the lower surface of the dust filter 4 can be guaranteed. This is because when cleaning the dust on the upper surface of the dust filter 4, a small amount of dust may fall and stick to the lower surface of the dust filter 4.

[0175] In some examples, when the fan operates in impeller reverse rotation self-cleaning mode, the angle between the airflow direction from the upper impeller portion 701 of the impeller 7 and the dust filter 4 ranges from 45° to 135°. When the fan operates in impeller forward rotation self-cleaning mode, the angle between the airflow direction from the lower impeller portion 701 of the impeller 7 and the dust filter 4 ranges from 45° to 135°.

[0176] See Figure 8 When the fan executes the impeller reverse self-cleaning mode, the airflow from the impeller 7 mainly flows towards the upper area of ​​the dust filter 4. Among them, for the airflow in contact with the dust filter 4, the angle between the airflow at different positions along the top-to-bottom direction and the corresponding position of the dust filter 4 gradually decreases.

[0177] For example, the angle between the airflow that is in contact with the dust filter 4 and the corresponding position in the upper part of the dust filter 4 can be 90° to 135°, such as 90°, 95°, 100°, 105°, 110°, 115°, 120°, 130°, etc.

[0178] The angle between the airflow that is in contact with the dust filter 4 and the corresponding position in the upper region of the dust filter 4 can be 45° to 60°, for example, 45°, 50°, 55°, 60°, etc.

[0179] The angle between the airflow that is in contact with the dust filter 4 and the corresponding position on the upper part of the dust filter 4 is within the range of the above-mentioned angles.

[0180] See Figure 9 When the fan is in the impeller forward rotation self-cleaning mode, the airflow from the impeller 7 mainly flows towards the lower area of ​​the dust filter 4. Among them, for the airflow in contact with the dust filter 4, the angle between the airflow at different positions along the top-to-bottom direction and the corresponding position of the dust filter 4 gradually decreases.

[0181] For example, the angle between the airflow that is in contact with the dust filter 4 and the corresponding position in the lower region of the dust filter 4 can be 90° to 135°, such as 90°, 95°, 100°, 105°, 110°, 115°, 120°, 130°, etc.

[0182] The angle between the airflow that is in contact with the dust filter 4 and the corresponding position in the lower part of the dust filter 4 can be 45° to 60°, for example, 45°, 50°, 55°, 60°, etc.

[0183] The angle between the airflow that is in contact with the dust filter 4 and is located at the top and bottom and the corresponding position of the lower region of the dust filter 4 is within the range of the above-mentioned angle.

[0184] With the above settings, most of the airflow from the impeller 7 can pass through the corresponding area of ​​the dust filter 4, effectively removing dust from the entire surface of the dust filter 4 and further improving the self-purification effect of the fan.

[0185] In embodiments of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "multiple" refers to two or more unless otherwise expressly defined.

[0186] The above description is merely for the purpose of enabling those skilled in the art to understand the technical solutions of the present invention, and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A fan, characterized by, The fan includes: a housing (1), an air inlet plate assembly (2), an air outlet plate assembly (3), a dust filter (4), a second dust bin (8), and a fan assembly; The housing (1) has a receiving cavity (11), an air inlet (12) and an air outlet (13), and the fan assembly includes a drive motor (6) and an impeller (7) connected to each other; The fan assembly is located in the accommodating cavity (11), the air inlet plate assembly (2) is located at the air inlet (12) and is spaced apart from the dust filter (4), the air outlet plate assembly (3) is located at the air outlet (13), and the dust filter (4) is located between the side of the air inlet plate assembly (2) and the impeller (7); The air inlet plate assembly (2) includes an air inlet cover (22) which is configured to be movable to open or close the air inlet (12); The air outlet assembly (3) includes an air outlet cover (32) which is configured to be movable to open or close the air outlet (13); The second dust chamber (8) has a second dust collection hole (81), and the bottom of the air inlet cover (22) and the dust filter (4) are located at the second dust collection hole (81); The fan includes an impeller reversing self-cleaning mode, comprising: the air inlet cover (22) closing the air inlet (12), the air outlet cover (32) closing the air outlet (13), and the impeller (7) being in a reverse reversing state, and, The fan also includes a forward rotation self-purification mode, which includes: the air inlet cover (22) closing the air inlet (12), the air outlet cover (32) closing the air outlet (13), and the impeller (7) being in a forward rotation state.

2. The fan of claim 1, wherein, The fan also includes a first dust chamber (5) located below the impeller (7), which is used to collect impurities mixed in with the airflow output by the impeller (7).

3. The fan of claim 1, wherein, The air inlet plate assembly (2) also includes an air inlet cover (21) with a perforated structure, and the air inlet cover (22) is attached to the outer surface of the air inlet cover (21) opposite to the dust filter (4); The air outlet assembly (3) also includes an air outlet cover (31) with a perforated structure, and the air outlet cover (32) is attached to the outer surface of the air outlet cover (31) opposite to the housing (1).

4. The fan according to claim 3, characterized in that, The air inlet cover (22) is hinged to the air inlet shroud (21) to open or close the air inlet (12) by rotation; and / or, The air outlet cover (32) is hinged to the air outlet housing (31) so as to open or close the air outlet (13) by rotation.

5. The fan according to claim 1, characterized in that, The dustproof net (4) is arranged in a vertical direction. The dustproof net (4) includes an upper region and a lower region that are distributed sequentially in a vertical direction. The upper region and the lower region are superimposed to cover the entire surface of the dustproof net (4). When the impeller (7) is in reverse, it can clean at least the upper area of ​​the dust screen (4); When the impeller (7) is rotating in the forward direction, it can clean at least the lower area of ​​the dust filter (4).

6. The fan according to claim 5, characterized in that, The impeller (7) includes a plurality of blades (70) arranged sequentially along the circumferential direction; In the impeller reverse state, the plurality of blades (70) are configured such that the angle between the air outlet direction of the air outlet end of the plurality of blades (70) and the dust filter (4) is 45°~135°, so that the airflow output by the impeller (7) can come into contact with the upper area of ​​the dust filter (4) to achieve cleaning. When the impeller is rotating in the forward direction, the plurality of blades (70) are configured such that the angle between the air outlet direction of the plurality of blades (70) and the dust filter (4) is 45°~135°, so that the airflow output by the impeller (7) can come into contact with the lower area of ​​the dust filter (4) to achieve cleaning.

7. The fan according to claim 1, characterized in that, The fan also includes a controller configured to control the operating state of the impeller (7), the air inlet cover (22) and the air outlet cover (32) so that the impeller (7) is in a forward or reverse rotation state, and that the air inlet (12) is opened or closed, and that the air outlet (13) is opened or closed.

8. The fan according to claim 1, characterized in that, The distance between the air inlet cover (22) and the dust filter (4) ranges from 3mm to 16mm; and / or, The distance between the air inlet cover (22) and the dust filter (4) gradually increases from the top to the bottom.

9. A fan self-cleaning method, characterized in that, The fan self-cleaning method is applied to the fan according to any one of claims 1-8, and the fan self-cleaning method includes: The air inlet cover (22) is used to close the air inlet (12), and the air outlet cover (32) is used to close the air outlet (13), and the impeller (7) is put in reverse, and the fan performs impeller reverse self-purification mode. The air inlet cover (22) is used to close the air inlet (12), and the air outlet cover (32) is used to close the air outlet (13), and the impeller (7) is in a forward rotation state, and the fan performs an impeller forward rotation self-purification mode.

10. The fan self-cleaning method according to claim 9, characterized in that, When the fan executes the impeller reverse self-cleaning mode, the speed of the impeller (7) is at least twice the maximum speed corresponding to the normal operation mode of the fan.

11. The fan self-cleaning method according to claim 9, characterized in that, When the fan executes the impeller forward rotation self-cleaning mode, the speed of the impeller (7) is at least 1.5 times the maximum speed corresponding to the normal operation mode of the fan.

12. The fan self-cleaning method according to claim 9, characterized in that, The fan self-cleaning method includes at least one round of purification operation, each round of purification operation including one impeller reverse self-cleaning mode and one impeller forward self-cleaning mode performed in sequence.

13. The fan self-cleaning method according to claim 12, characterized in that, The ratio of the running time of the impeller reverse rotation self-cleaning mode to that of the impeller forward rotation self-cleaning mode is 1:1 to 1.

5.

14. The fan self-cleaning method according to claim 9, characterized in that, When the fan executes the impeller reverse self-cleaning mode, the angle between the airflow direction from the upper impeller part (701) of the impeller (7) and the dust filter (4) is 45°~135°. When the fan executes the impeller forward rotation self-cleaning mode, the angle between the airflow direction from the lower impeller part (701) of the impeller (7) and the dust filter (4) is 45°~135°.

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