Self-cleaning dust collection device

Abstract

The utility model discloses a self-cleaning dust collection device which comprises a shell, a motor assembly and a filter assembly, the motor assembly and the filter assembly are both arranged in the shell, the motor assembly is provided with a motor air inlet and a motor air outlet, the filter assembly is provided with an air blowing channel, and the filter assembly is arranged at the bottom of the motor air outlet. The air blowing channel is communicated with the motor air outlet, and the cross section area of the air blowing channel is 0.5-3 times of the cross section area of the motor air inlet. When the cross sectional area of the air blowing channel is larger than three times of the cross sectional area of the air inlet of the motor, the blowing force of airflow in the air blowing channel is weak, and self-cleaning cannot be achieved; when the cross sectional area of the air blowing channel is smaller than 0.5 times of the cross sectional area of the air inlet of the motor, the airflow resistance in the air blowing channel is large, and the ventilation is easy to be unsmooth; when the cross sectional area of the air blowing channel is 0.5-3 times of the cross sectional area of the air inlet of the motor, dust on the filtering assembly can fall off, airflow in the air blowing channel is smooth, and the self-cleaning effect is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of vacuum cleaners, in particular to a self-cleaning vacuum cleaner. Background Art

[0002] Handheld vacuum cleaners are increasingly entering thousands of households due to their advantages of being small and portable and not constrained by power cords. Handheld vacuum cleaners generally use the negative pressure generated by the fan to absorb garbage and other impurities into the dust bucket for collection. The dust cup has a small volume, and the dust bucket is opened to dump the garbage after use. However, when dumping the dust, the dust will scatter and cause secondary pollution. In order to solve the above problems, base stations with dust collection functions have appeared on the market, which can collect dust in the dust cup to avoid dust. In order to reduce the resistance of the airflow, the cross-sectional area of ​​the air blowing channel used in the self-cleaning mode of the existing vacuum cleaner is set too large, resulting in a small impact force of the airflow, making it difficult to blow the dust in the dust cup off, resulting in poor dust collection effect. However, the cross-sectional area of ​​the air blowing channel is too small, which makes the resistance of the airflow large, and the performance requirements of the dust cup are extremely high. Utility Model Content

[0003] The purpose of the utility model is to provide a self-cleaning dust suction device to solve the technical problems in the prior art that the cross-sectional area of ​​the air blowing channel of the vacuum cleaner used in the self-cleaning mode is too large, resulting in small impact force of the air flow, making it difficult to blow off the dust in the dust cup, resulting in poor dust collection effect; and the cross-sectional area of ​​the air blowing channel is too small, which makes the resistance of the air flow large and places extremely high performance requirements on the dust cup.

[0004] The utility model provides a self-cleaning dust suction device, comprising a shell, a motor assembly and a filter assembly, wherein the motor assembly and the filter assembly are both arranged in the shell, the motor assembly has a motor air inlet and a motor air outlet, the filter assembly has a blowing channel, the filter assembly is arranged at the bottom of the motor air outlet, the blowing channel is connected to the motor air outlet, and the cross-sectional area of ​​the blowing channel is 0.5 to 3 times the cross-sectional area of ​​the motor air inlet.

[0005] As described above, the self-cleaning dust suction device has a connecting bracket disposed in the shell, wherein the connecting bracket is disposed in the shell, one end of the connecting bracket is connected to the motor assembly, and the other end is connected to the filter assembly, and an air cavity with openings at both ends is provided on the connecting bracket, one end of the air cavity is connected to the motor air outlet, and the other end is connected to the blowing channel.

[0006] As described above, the self-cleaning dust suction device, the motor assembly includes a motor body and a motor cover, the motor cover is provided with a accommodating cavity, the motor body is arranged in the accommodating cavity, the motor air inlet and the motor air outlet are both arranged on the motor cover, and the motor air inlet and the motor air outlet are respectively connected to the accommodating cavity, and the connecting bracket is connected to the motor cover.

[0007] As described above, the self-cleaning dust suction device, the filter assembly includes a mounting seat and a filter element, the mounting seat is provided with a first air hole, the hole wall of the first air hole extends downward to form an annular boss, the filter element is arranged on the mounting seat, and the filter element is located inside the annular boss, and the blowing channel is formed between the outer wall of the filter element and the inner wall of the annular boss.

[0008] In the self-cleaning dust suction device as described above, the cross-sectional area of ​​the air blowing channel is 1 to 2 times the cross-sectional area of ​​the motor air inlet.

[0009] In the self-cleaning dust collecting device as described above, the filter element comprises a top cover and a filter element body, the bottom of the top cover is connected to the top of the filter element body, and the top of the top cover is connected to the mounting seat.

[0010] In the self-cleaning dust collecting device as described above, a plurality of folds are formed on the outer wall of the filter body, and the fold line between any two adjacent folds is consistent with the flow direction of the blowing channel.

[0011] In the self-cleaning dust suction device as described above, the filter assembly further comprises a cyclone separator, and the filter element is arranged between the cyclone separator and the air outlet of the motor.

[0012] As described above, the self-cleaning dust suction device is provided with a second air hole on the mounting base, and an air passage is provided on the connecting bracket. The air passage and the air cavity are independent passages from each other. An air vent is provided on the motor cover, and the air vent is connected with the accommodating cavity. The air passage connects the second air hole and the air vent.

[0013] As described above, the self-cleaning dust suction device further comprises a dust cup body, the filter assembly is arranged in the dust cup body, a dust suction air inlet is arranged on the dust cup body, and the dust suction air inlet is connected to the second air hole.

[0014] Implementing the embodiments of the present utility model will have the following beneficial effects:

[0015] In the utility model, the motor assembly has a motor air inlet and a motor air outlet, the filter assembly has a blowing channel, the blowing channel is connected to the motor air outlet, and the cross-sectional area of ​​the blowing channel is 0.5 to 3 times the cross-sectional area of ​​the motor air inlet. In the self-cleaning mode, the airflow enters from the motor air inlet through the motor assembly and then blows all toward the blowing channel through the motor air outlet, blowing off the dust accumulated on the filter assembly and blowing it to the base of the self-cleaning dust suction device for collection. When the cross-sectional area of ​​the blowing channel is greater than 3 times the cross-sectional area of ​​the motor air inlet, the airflow sweeping force in the blowing channel is weak and the dust on the filter assembly cannot be blown off; when the cross-sectional area of ​​the blowing channel is less than 0.5 times the cross-sectional area of ​​the motor air inlet, the airflow resistance in the blowing channel is large and the ventilation is easy to be blocked; when the cross-sectional area of ​​the blowing channel is 0.5 to 3 times the cross-sectional area of ​​the motor air inlet, the dust on the filter assembly can be dropped off and the airflow in the blowing channel can be unblocked, thereby achieving a better self-cleaning effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 is a cross-sectional view of a self-cleaning dust suction device according to an exemplary embodiment;

[0018] Figure 2 is a schematic structural diagram of a dust cup of a self-cleaning dust suction device according to an exemplary embodiment;

[0019] Figure 3 is a cross-sectional view of a dust cup of a self-cleaning dust suction device according to an exemplary embodiment;

[0020] Figure 4 is an exploded view of a dust cup of a self-cleaning dust suction device according to an exemplary embodiment;

[0021] Figure 5 is a cross-sectional view of a dust cup of a self-cleaning dust suction device according to an exemplary embodiment;

[0022] Figure 6 It is a test effect diagram when the ratio of the cross-sectional area of ​​the blowing channel to the cross-sectional area of ​​the motor air inlet is different.

[0023] Wherein: 1. Motor assembly; 11. Motor air inlet; 12. Motor air outlet; 13. Motor body; 14. Motor cover; 15. Accommodation chamber; 2. Filter assembly; 21. Blowing channel; 22. Cyclone separator; 221. Filter bracket; 222. Filter screen; 223. Spiral air guide groove; 23. Filter element; 231. Top cover; 232. Filter element body; 233. Bottom cover; 24. Mounting seat; 241. First air hole; 242. Annular boss; 243. Second air hole; 3. Dust cup body; 31. Dust suction air inlet; 4. Connecting bracket; 41. Air cavity. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0026] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0027] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0029] It should be noted that the airflow in the blowing channel in this article is the airflow blown toward the blowing channel by the blowing device, or the suction airflow formed in the blowing channel under the suction action of the suction device. The airflow generated by the blowing device and the suction device can both blow the filter component to achieve a self-cleaning effect.

[0030] See also Figure 1-Figure 5 The utility model provides a self-cleaning dust suction device, including a housing, a motor assembly 1 and a filter assembly 2. The motor assembly 1 and the filter assembly 2 are both arranged in the housing. The motor assembly 1 has a motor air inlet 11 and a motor air outlet 12. The filter assembly 2 has a blowing channel 21. The filter assembly 2 is arranged at the bottom of the motor air outlet 12. The blowing channel 21 is connected to the motor air outlet 12. The cross-sectional area of ​​the blowing channel 21 is 0.5 to 3 times the cross-sectional area of ​​the motor air inlet 11. Specifically, the cross-sectional area of ​​the blowing channel 21 can be 0.5 times, 1 times, 1.1 times, 1.2 times, 1.3 times, 1.4 times, 1.5 times, 1.6 times, 1.7 times, 1.8 times, 1.9 times, 2 times, 2.5 times or 3 times the cross-sectional area of ​​the motor air inlet 11, and can also be any other value from 1 to 3. The self-cleaning dust suction device has a dust suction mode and a self-cleaning mode. In the self-cleaning mode, the airflow enters from the motor air inlet 11 through the motor assembly 1 and then blows all the air to the blowing channel 21 through the motor air outlet 12, blowing off the dust accumulated on the filter assembly 2 and blowing it to the base of the self-cleaning dust suction device for collection. When the cross-sectional area of ​​the blowing channel 21 is greater than 3 times the cross-sectional area of ​​the motor air inlet 11, the airflow sweeping force in the blowing channel 21 is weak and the dust on the filter assembly 2 cannot be blown off; when the cross-sectional area of ​​the blowing channel 21 is less than 0.5 times the cross-sectional area of ​​the motor air inlet 11, the airflow resistance in the blowing channel 21 is large, which easily leads to poor ventilation of the blowing channel 21, affecting the flow of airflow, thereby affecting the effect of self-cleaning; when the cross-sectional area of ​​the blowing channel 21 is 0.5 to 3 times the cross-sectional area of ​​the motor air inlet 11, the dust on the filter assembly 2 can be removed and the airflow in the blowing channel 21 can be smooth, achieving a better self-cleaning effect.

[0031] Furthermore, the cross-sectional area of ​​the air blowing channel 21 is 1 to 2 times the cross-sectional area of ​​the motor air inlet 11 , which enables the self-cleaning mode to achieve a better cleaning effect and higher economic benefits.

[0032] In an exemplary embodiment, the cross-sectional area of ​​the motor air inlet 11 is 380 square millimeters, and the cross-sectional area of ​​the blowing channel 21 is 620 square millimeters, that is, the cross-sectional area of ​​the blowing channel 21 is 1.63 times the cross-sectional area of ​​the motor air inlet 11 .

[0033] like Figure 6 As shown, when the cross-sectional area of ​​the blowing channel 21 is 3 times the cross-sectional area of ​​the motor air inlet 11, the dust collecting device still maintains 25% of the suction force after six months of use, indicating that the airflow sweeping force in the blowing channel 21 is strong and can blow off part of the dust attached to the filter component 2; when the cross-sectional area of ​​the blowing channel 21 is 2 times the cross-sectional area of ​​the motor air inlet 11, the dust collecting device still maintains 60% of the suction force after six months of use, indicating that the airflow sweeping force in the blowing channel 21 is enhanced and can blow off most of the dust attached to the filter component 2; when the cross-sectional area of ​​the blowing channel 21 is 1.5 times the cross-sectional area of ​​the motor air inlet 11, the dust collecting device still maintains 70% of the suction force after six months of use, indicating that the self-cleaning effect of the dust collecting device achieves better performance. Most of the dust attached to the filter component 2 can be blown off, and the self-cleaning effect is further greatly enhanced; when the cross-sectional area of ​​the blowing channel 21 is 1 times the cross-sectional area of ​​the motor air inlet 11, the dust suction device still maintains 75% of the suction force after six months of use, indicating that the airflow sweeping force in the blowing channel 21 is further enhanced, and most of the dust attached to the filter component 2 can be blown off; when the cross-sectional area of ​​the blowing channel 21 is 0.5 times the cross-sectional area of ​​the motor air inlet 11, the dust suction device can still maintain 80% of the suction force after six months of use, and the suction force is maintained between 70%-80% for a long time thereafter, indicating that the self-cleaning effect of the dust suction device reaches the best performance, and most of the dust attached to the filter component 2 can be blown off, and the self-cleaning effect reaches the best performance.

[0034] When the cross-sectional area of ​​the blowing channel 21 is greater than 3 times the cross-sectional area of ​​the motor air inlet 11, the suction force of the dust collecting device drops below 50% after one week of use, indicating that the airflow sweeping force in the blowing channel 21 is weak and the dust on the filter assembly 2 cannot be blown off, resulting in serious blockage of the filter assembly 2; and when the cross-sectional area of ​​the blowing channel 21 is less than 0.5 times the cross-sectional area of ​​the motor air inlet 11, the airflow resistance in the blowing channel 21 is large, which easily leads to poor ventilation of the blowing channel 21, affecting the flow of airflow, thereby affecting the self-cleaning effect;

[0035] Furthermore, a connecting bracket 4 is provided in the shell, and the connecting bracket 4 is arranged in the shell, one end of the connecting bracket 4 is connected to the motor assembly 1, and the other end is connected to the filter assembly 2, and an air cavity 41 with openings at both ends is provided on the connecting bracket 4, one end of the air cavity 41 is connected to the motor air outlet 12, and the other end is connected to the blowing channel 21, and the air cavity 41 is used to guide the airflow coming out of the motor air outlet 12 to the filter assembly 2, so as to realize the blowing of the filter assembly 2.

[0036] Further, the motor assembly 1 includes a motor body 13 and a motor cover 14, a housing chamber 15 is provided inside the motor cover 14, the motor body 13 is disposed in the housing chamber 15, the motor air inlet 11 and the motor air outlet 12 are both disposed on the motor cover 14, and the motor air inlet 11 and the motor air outlet 12 are respectively communicated with the housing chamber 15, and the connecting bracket 4 is connected to the motor cover 14. The gas enters the motor cover 14 from the motor air inlet 11, and is discharged from the motor air outlet 12 under the action of the motor body 13, and the motor body 13 may include a fan that can guide the airflow to flow to the motor air outlet 12.

[0037] Furthermore, the filter assembly 2 includes a mounting seat 24 and a filter element 23. The mounting seat 24 is provided with a first air hole 241. The hole wall of the first air hole 241 extends downward to form an annular boss 242. The filter element 23 is arranged on the mounting seat 24, and the filter element 23 is located inside the annular boss 242. A blowing channel 21 is formed between the outer wall of the filter element 23 and the inner wall of the annular boss 242. In the self-cleaning mode, the airflow enters from the motor air inlet 11, passes through the accommodating cavity 15, and then exits from the motor air outlet 12. It passes through the air cavity 41 and then enters the blowing channel 21 from the first air hole 241, blows off the dust accumulated on the filter assembly 2, and blows it to the base of the self-cleaning dust suction device for collection.

[0038] Specifically, the cross-sectional area of ​​the blowing channel 21 is the instantaneous cross-sectional area of ​​the airflow, which can be the cross-sectional area of ​​the entire area between the outer wall of the filter element 23 and the inner wall of the annular boss 242, or the cross-sectional area of ​​a partial area between the outer wall of the filter element 23 and the inner wall of the annular boss 242. When the first air hole 241 covers the entire area between the outer wall of the filter element 23 and the inner wall of the annular boss 242, the blowing channel 21 is the cross-sectional area of ​​the entire area between the outer wall of the filter element 23 and the inner wall of the annular boss 242; when the first air hole 241 covers the partial area between the outer wall of the filter element 23 and the inner wall of the annular boss 242, the blowing channel 21 is the cross-sectional area of ​​the partial area between the outer wall of the filter element 23 and the inner wall of the annular boss 242 covered by the first air hole 241. In an exemplary embodiment, the first air hole 241 is an annular hole, the air cavity 41 is also an annular cavity, the lower end of the air cavity 41 corresponds to the first air hole 241, and the first air hole 241 completely covers the blowing channel 21, which is the entire area between the outer wall of the filter element 23 and the inner wall of the annular boss 242.

[0039] Furthermore, the filter element 23 includes a top cover 231 and a filter element body 232 , the bottom of the top cover 231 is connected to the top of the filter element body 232 , and the top of the top cover 231 is connected to the mounting seat 24 .

[0040] Furthermore, a plurality of folds are formed on the outer wall of the filter body 232, and the fold line between any two adjacent folds is consistent with the flow direction of the blowing channel 21 to achieve the cleaning of the outer wall of the filter body 232. The filter body 232 is formed by multiple folds of sheet or plate-shaped filter paper, and each fold is triangular or U-shaped. The fold is preferably U-shaped, which can prevent dust from accumulating in sharp angles and being difficult to blow out.

[0041] Furthermore, the filter assembly 2 also includes a cyclone separator 22, the mounting seat 24 is covered on the cyclone separator 22 and forms a accommodating space, the filter element 23 is arranged in the accommodating space, the annular boss 242 extends into the accommodating space, and the length of the annular boss 242 extending into the accommodating space is at least half of the height of the filter element 23, so that the blowing channel 21 formed between the outer wall of the filter element 23 and the inner wall of the annular boss 242 has sufficient length to ensure the blowing efficiency of the filter element 23.

[0042] Optionally, the filter body 232 of the present invention is an annular structure. In some other embodiments, the filter body 232 may also be a square structure or other shapes, and the inner side wall of the annular boss 242 may also be a corresponding square structure or other shapes.

[0043] Optionally, the pleats in this embodiment are distributed all over the outer side wall of the filter body 232 . In some other embodiments, the pleats may be arranged at intervals on the outer side wall of the filter body 232 .

[0044] Furthermore, the motor air inlet 11, the accommodating cavity 15, the motor air outlet 12, the air cavity 41 and the blowing channel 21 together form an air flow path, and the minimum cross-sectional area of ​​the air flow path is not less than 0.5 times the cross-sectional area of ​​the motor air inlet 11, thereby ensuring that the air flow path can be fully ventilated.

[0045] Furthermore, the filter element 23 further includes a bottom cover 233, which is disposed at one end of the filter element body 232 away from the mounting seat 24, and a gap is left between the bottom cover 233 and the inner wall of the accommodation space, and the airflow in the blowing channel 21 can drive the dust to be discharged from the avoidance gap. In the self-cleaning mode, the airflow enters from the motor air inlet 11 through the accommodation cavity 15 and then blows toward the filter assembly 2 through the motor air outlet 12, and then enters the blowing channel 21 from the first air hole 241, and finally is discharged from the gap between the bottom cover 233 and the inner wall of the accommodation space to enter the base station.

[0046] Furthermore, the cyclone separator 22 includes a filter bracket 221 and a filter screen 222 mounted on the filter bracket 221 , and the accommodating space is arranged in the middle of the filter bracket 221 .

[0047] Furthermore, the filter bracket 221 includes a first section, a second section, and a third section arranged in sequence from top to bottom, the outer diameter of the first section is larger than the outer diameter of the second section and the outer diameter of the third section, the filter screen 222 is arranged on the outer wall of the second section, the third section is in the shape of an inverted cone, and the outer wall of the first section protrudes radially outward to form a spiral air guide groove 223, which spirally extends downward. The spiral air guide groove 223 is used to supply airflow into the dust cup in the dust suction mode.

[0048] Furthermore, a second air hole 243 is provided on the mounting base 24, and the second air hole 243 is located in the middle of the first air hole 241. An air passage is provided on the connecting bracket 4, and the air passage is located in the middle of the air cavity 41. The air passage and the air cavity 41 are independent passages from each other. An air vent is also provided on the motor cover 14, and the air vent is connected to the accommodating cavity. The air passage connects the second air hole 243 and the air vent.

[0049] Furthermore, the self-cleaning dust suction device also includes a dust cup body 3, a filter assembly 2 is arranged in the dust cup body 3, a dust suction air inlet 31 is arranged on the dust cup body 3, the dust suction air inlet 31 is communicated with the spiral air guide groove 223, and the dust suction air inlet 31 is communicated with the second air hole 243. The filter assembly 2 and the dust cup body 3 form a dust cup. The spiral air guide groove 223 is an open groove. When the filter assembly 2 is installed on the dust cup body 3, the spiral air guide groove 223 and the inner wall of the dust cup body 3 form a spiral air guide channel for supplying airflow into the dust cup in the dust suction mode.

[0050] In the dust suction mode, the airflow sucked by the roller brush of the self-cleaning dust suction device enters the gap between the dust cup body 3 and the filter bracket 221 from the spiral air guide channel, and then enters the gap between the inner wall of the filter bracket 221 and the filter body 232 after passing through the filter screen 222. The airflow passes through the filter body 232 and blocks dust, impurities, etc. on the outer wall of the filter body 232. The airflow entering the filter body 232 enters the air passage from the second air hole 243, and then enters the accommodating chamber 15 through the vent, and finally is discharged from the exhaust port on the self-cleaning dust suction device. It should be understood that a control device is provided on the self-cleaning dust suction device. When in the dust suction mode, the control device can close the motor air inlet 11 and the motor air outlet 12, and when in the self-cleaning mode, the control device can close the vent.

[0051] The above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit the protection scope of the utility model.

Claims

1. A self-cleaning dust collecting device, characterized in that: It includes a shell, a motor assembly and a filter assembly, wherein the motor assembly and the filter assembly are both arranged in the shell, the motor assembly has a motor air inlet and a motor air outlet, the filter assembly has a blowing channel, the filter assembly is arranged at the bottom of the motor air outlet, the blowing channel is connected to the motor air outlet, and the cross-sectional area of ​​the blowing channel is 0.5 to 3 times the cross-sectional area of ​​the motor air inlet.

2. The self-cleaning dust suction device according to claim 1, characterized in that: A connecting bracket is provided in the shell, and the connecting bracket is arranged in the shell. One end of the connecting bracket is connected to the motor assembly, and the other end is connected to the filter assembly. The connecting bracket is provided with an air cavity with openings at both ends, one end of the air cavity is connected to the motor air outlet, and the other end is connected to the blowing channel.

3. The self-cleaning dust suction device according to claim 2, characterized in that: The motor assembly includes a motor body and a motor cover, the motor cover is provided with a accommodating cavity, the motor body is arranged in the accommodating cavity, the motor air inlet and the motor air outlet are both arranged on the motor cover, and the motor air inlet and the motor air outlet are respectively connected to the accommodating cavity, and the connecting bracket is connected to the motor cover.

4. The self-cleaning dust suction device according to claim 3, characterized in that: The filter assembly includes a mounting seat and a filter element. The mounting seat is provided with a first air hole. The hole wall of the first air hole extends downward to form an annular boss. The filter element is arranged on the mounting seat, and the filter element is located inside the annular boss. The blowing channel is formed between the outer wall of the filter element and the inner wall of the annular boss.

5. The self-cleaning dust suction device according to claim 1, characterized in that: The cross-sectional area of ​​the air blowing channel is 1 to 2 times the cross-sectional area of ​​the motor air inlet.

6. The self-cleaning dust suction device according to claim 4, characterized in that: The filter element comprises a top cover and a filter element body, the bottom of the top cover is connected to the top end of the filter element body, and the top of the top cover is connected to the mounting seat.

7. The self-cleaning dust suction device according to claim 6, characterized in that: A plurality of folds are formed on the outer wall of the filter body, and the fold line between any two adjacent folds is consistent with the flow direction of the blowing channel.

8. The self-cleaning dust suction device according to claim 4, characterized in that: The filter assembly further includes a cyclone separator, and the filter element is arranged between the cyclone separator and the motor air outlet.

9. The self-cleaning dust suction device according to claim 4, characterized in that: A second air hole is provided on the mounting seat, an air passage is provided on the connecting bracket, the air passage and the air cavity are independent of each other, a vent hole is provided on the motor cover, the vent hole is connected with the accommodating cavity, and the air passage connects the second air hole and the vent hole.

10. The self-cleaning dust suction device according to claim 9, characterized in that: The self-cleaning dust suction device also includes a dust cup body, the filter assembly is arranged in the dust cup body, and a dust suction air inlet is provided on the dust cup body, and the dust suction air inlet is connected to the second air hole.

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