Dust removal device

Abstract

The utility model provides a dust removal device. The dust removal device comprises an upper separator, a lower separator, a fan and a dust collection part, the upper separator is provided with a second cavity and an air inlet communicated with the second cavity. The upper separator comprises a protruding column extending into the second cavity, and an air outlet channel communicated with the second cavity is defined by the protruding column. The lower separator is located below the upper separator, a first cavity communicated with the second cavity is defined by the lower separator, and at least part of the first cavity is in a funnel shape. The fan is located above the upper separator, and suction force of the fan enables air to enter the second cavity through the air inlet. The dust collecting part is located below the lower separator and defines a dust collecting cavity communicated with the first cavity. Air with dust enters the second cavity to form a cyclone effect, so that dust in the air is separated and falls down, and relatively clean air is blown out.

Description

Technical Field

[0001] This application relates to the field of dust removal technology, and more particularly to a dust removal device. Background Technology

[0002] All cameras operate on the same basic principle: converting optical image signals into electrical signals for storage or transmission. When we photograph an object, the light reflected from that object is collected by the camera lens and focused onto the light-receiving surface of the imaging device (such as the target surface of a camera tube). The imaging device then converts the light into electrical energy, resulting in a "video signal." Since photoelectric signals are very weak, they need to be amplified by a preamplifier circuit, processed and adjusted by various circuits, and finally, the resulting standard signal can be sent to a recording medium such as a video recorder for recording, or transmitted through a transmission system or displayed on a monitor.

[0003] Due to the working environment and usage time, the camera's viewing window is prone to dust accumulation, resulting in unclear images. Utility Model Content

[0004] This application provides a dust removal device.

[0005] This application provides a dust removal device, including: an upper separator, a lower separator, a fan, and a dust collection unit. The upper separator has a second cavity and an air inlet communicating with the second cavity. The upper separator includes a protruding post extending into the second cavity, which forms an air outlet channel communicating with the second cavity. The lower separator is located below the upper separator and forms a first cavity communicating with the second cavity. At least a portion of the first cavity is funnel-shaped. The fan is located above the upper separator, and the suction force of the fan causes air to enter the second cavity through the air inlet. The dust collection unit is located below the lower separator and forms a dust collection chamber communicating with the first cavity.

[0006] Furthermore, the bottom of the air inlet is higher than the bottom of the protruding post.

[0007] Furthermore, the upper separator includes a top wall, a side wall extending downward from the top wall, and a protrusion extending outward from the side wall. The protrusion extends downward from the top wall, and the air inlet is disposed on the protrusion. The orientation of the air inlet is tangent to the circumferential direction of the side wall.

[0008] Further, the air inlet is rectangular, the length of the air inlet is defined as a, the width of the air inlet is defined as b, the diameter of the air outlet channel is defined as d1, the height of the air outlet channel is defined as h, the diameter of the second cavity is defined as d2, the height of the second cavity is defined as H, a / b is greater than or equal to 2 and less than or equal to 3, a is greater than or equal to 0.4d2 and less than or equal to 0.75d2, b is greater than or equal to 0.2d2 and less than or equal to 0.25d2, d1 is greater than or equal to 0.4d2 and less than or equal to 0.65d2, h is greater than or equal to 0.8a, and H is greater than or equal to 1.5d2 and less than or equal to 2d2.

[0009] Furthermore, the cone angle of the first cavity is defined as α, which is greater than or equal to 26° and less than or equal to 30°, and the diameter of the ash outlet of the first cavity is defined as d3, which is greater than or equal to 1 / 3d2 and less than or equal to 1 / 2d2.

[0010] Furthermore, the dust removal device includes a first mounting bracket and a second mounting bracket fixed to the first mounting bracket. The fan is fixed to the first mounting bracket. At least part of the upper separator is located within the space enclosed by the first mounting bracket. The lower separator is fixed to the upper separator. Air enters the air inlet after passing through the second mounting bracket.

[0011] Furthermore, the second mounting bracket is located below the first mounting bracket and is annular, and the second mounting bracket has a channel through which the upper separator or the lower separator passes.

[0012] Furthermore, the second mounting bracket includes an air inlet and an outlet, the air inlet facing the dust collection unit, and the air inlet and the outlet being offset along the height direction of the second mounting bracket.

[0013] Furthermore, the dust collection unit includes a main body and a cover plate connected to the main body. The cover plate can switch between an open state and a closed state to open and close the dust collection chamber.

[0014] Furthermore, the dust removal device includes a motor to drive the cover plate to switch between the open state and the closed state.

[0015] The dust removal device of this application embodiment is configured with an upper separator, a lower separator and a fan. The upper separator forms a second cavity and includes a protruding column extending into the second cavity. The lower separator is located below the upper separator and forms a first cavity that communicates with the second cavity. At least part of the first cavity is funnel-shaped. After the dusty air enters the second cavity, it forms a cyclone effect, so that the dust in the air is separated and falls, so as to blow out relatively clean air. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a dust removal device according to an embodiment of this application, wherein the cover is in a closed state;

[0017] Figure 2 yes Figure 1 An exploded view of the dust removal device shown;

[0018] Figure 3 yes Figure 1 The diagram shows a cross-sectional view of the dust removal device.

[0019] Figure 4 yes Figure 1 The diagram shows a cross-sectional view of the dust removal device.

[0020] Figure 5 yes Figure 2 A schematic diagram of the upper separator of the dust removal device is shown;

[0021] Figure 6 yes Figure 5 The diagram shows a cross-sectional view of the upper separator.

[0022] Figure 7 yes Figure 2 A schematic diagram of the lower separator of the dust removal device is shown.

[0023] Figure 8 yes Figure 7 The diagram shows a cross-sectional view of the lower separator.

[0024] Figure 9 yes Figure 4 An enlarged view of the circled portion at point A in the cross-sectional schematic diagram shown;

[0025] Figure 10 yes Figure 2 A schematic diagram of the first mounting bracket of the dust removal device shown;

[0026] Figure 11 yes Figure 10 A cross-sectional schematic diagram of the first mounting bracket shown;

[0027] Figure 12 yes Figure 2 A schematic diagram of the second mounting bracket of the dust removal device shown;

[0028] Figure 13 yes Figure 1 A schematic diagram showing the dust removal device with its cover in the open position;

[0029] Figure 14 yes Figure 2 The diagram shows the assembled dust collection unit, cover plate, and motor, with the cover plate in the closed position.

[0030] Figure 15yes Figure 14 An exploded view of the schematic diagram shown;

[0031] Figure 16 yes Figure 2 The diagram shows the assembled dust collection unit, cover plate, and motor, with the cover plate in the open position. Detailed Implementation

[0032] The technical solutions in the embodiments (or "implementations") of this application will be clearly and completely described herein with reference to the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0033] If the embodiments of this application contain terms relating to directional indications or positional relationships (such as up, down, left, right, front, back, inside, outside, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative positional relationships and movements between components in a specific posture (as shown in the attached figures); if the specific posture changes, the directional indications or positional relationships will also change accordingly. Furthermore, the terms "first" and "second" used in the embodiments of this application are only for descriptive convenience and should not be construed as indicating or implying relative importance.

[0034] See Figures 1 to 5 As shown, the camera assembly of this application embodiment includes a camera (not shown) and a dust removal device 100. The camera includes a viewing window (not shown). The dust removal device 100 includes an upper separator 1, a lower separator 2, a fan 3, and a dust collection unit 4.

[0035] The upper separator 1 is provided with a second cavity 11 and an air inlet 12 communicating with the second cavity 11. The upper separator 1 also includes a protrusion 13 extending into the second cavity 11. The protrusion 13 forms an air outlet channel 131 communicating with the second cavity 11.

[0036] The lower separator 2 is located below the upper separator 1 and forms a first cavity 21 that communicates with the second cavity 11. At least a portion of the first cavity 21 is funnel-shaped.

[0037] The fan 3 is located above the upper separator 1, and the suction of the fan 3 causes air to enter the second cavity 11 through the air inlet 12.

[0038] The dust collection section 4 is located below the lower separator 2 and forms a dust collection chamber 41 that communicates with the first cavity 21.

[0039] The configuration of the upper separator 1 and the lower separator 2 is as follows: Figure 4As shown by the arrow, when the dusty air enters the second cavity 11 through the air inlet 12, a cyclone effect is formed in the second cavity 11 and the first cavity 21. The dust collides and rubs against the inner wall surfaces of the upper separator 1 and the lower separator 2, and finally falls into the dust collection cavity 41 due to its own gravity. The purified air is discharged through the air outlet channel 131 to blow out relatively clean air. The dust removal device 100 can separate dust from air through a fan 3, an upper separator 1 and a lower separator 2. It has a simple structure and a relatively small volume, and can be applied to small products.

[0040] Refer Figures 5 to 6 , in some embodiments, the upper separator 1 includes a top wall 14, a side wall 15 extending downward from the top wall 14, and a protrusion 16 extending outward from the side wall 15. The top wall 14 and the side wall 15 enclose the second cavity 11. The convex column 13 extends downward from the top wall 14. The air inlet 12 is arranged on the protrusion 16, and the orientation of the air inlet 12 is tangent to the circumferential direction of the side wall 15, so that the dusty air smoothly enters the second cavity 11 laterally.

[0041] In some embodiments, the upper separator 1 includes a convex column 13 extending longitudinally downward along its upper end, and the inner wall of the convex column 13 defines the aperture of the air outlet channel 131 of the upper separator 1.

[0042] In some embodiments, the upper end of the air outlet channel 131 of the upper separator 1 is flush with the upper end of the air inlet 12 of the upper separator 1.

[0043] In some embodiments, the upper end of the air outlet channel 131 of the upper separator 1 is higher than the upper end of the air inlet 12 of the upper separator 1, and this application does not limit this.

[0044] In some embodiments, the second cavity 11 is cylindrical, and this application does not limit the shape of the second cavity 11.

[0045] In some embodiments, the air inlet 12 of the upper separator 1 is arranged on the circumferential wall of the upper separator 1.

[0046] Refer Figure 4 , in some embodiments, the wind direction of the air inlet 12 of the upper separator 1 is perpendicular to the wind direction of the air inlet of the lower separator 2.

[0047] In some embodiments, the wind direction of the air inlet 12 of the upper separator 1 is along the horizontal direction, and the wind direction of the air inlet of the lower separator 2 is along the vertical direction.

[0048] In some embodiments, the lowermost end of the air inlet 12 is higher than the lowermost end of the convex column 13 to improve the cyclone effect.

[0049] In some embodiments, the air inlet 12 is rectangular to improve the cyclone effect.

[0050] The length of the air inlet 12 is defined as a, the width of the air inlet 12 is defined as b, the diameter of the air outlet channel 131 is defined as d1, the diameter of the second cavity 11 is defined as d2, the height of the air outlet channel 131 is defined as h, and the height of the second cavity 11 is defined as H. Then, a / b is greater than or equal to 2 and less than or equal to 3; a is greater than or equal to 0.4d2 and less than or equal to 0.75d2; b is greater than or equal to 0.2d2 and less than or equal to 0.25d2; d1 is greater than or equal to 0.4d2 and less than or equal to 0.65d2; H is greater than or equal to 1.5d2 and less than or equal to 2d2, and h is greater than or equal to 0.8a to improve the effect of dust and air separation.

[0051] In some embodiments, the upper separator 1 includes a first ear portion 17 extending outward from the top end of the side wall 15 and a positioning portion 18 protruding outward from the bottom end of the side wall 15. One or more first ear portions 17 can be provided, and one or more positioning portions 18 can be provided. The present application does not limit the number of the first ear portions 17 and the positioning portions 18. The first ear portion 17 is provided with a first hole 171. The positioning portion 18 is provided with a second hole

[0052] In some embodiments, the bottom end of the side wall 15 is provided with a first step portion to form a supporting portion 19 located below the side wall 15.

[0053] See Figures 7 to 9 , the lower separator 2 includes a side wall 22, a second ear portion 23 extending outward from the top end of the side wall 22, a baffle 24 extending upward from the second ear portion 23, and a positioning column 25 extending downward from the side wall 22. The side wall 22 encloses a first cavity 21. The second ear portion 23 is provided with a third hole 231.

[0054] The positioning column 25 is used to be fixed to the dust collection portion 4 to achieve the fixation between the lower separator 2 and the dust collection portion 4.

[0055] In some embodiments, the top end of the side wall 22 is provided with a second step portion to form a recessed groove 221.

[0056] In some embodiments, the bottom end of the side wall 22 is provided with a receiving groove 222. The dust removal device 100 includes a sealing ring 6 received in the receiving groove 222. The sealing ring 6 is in sealing contact with the side wall 22 and the dust collection portion 4 to prevent air leakage between the lower separator 2 and the dust collection portion 4.

[0057] In some embodiments, the conical angle of the first cavity 21 is defined as α, and the diameter of the ash outlet 211 of the first cavity 21 is defined as d3. Then, α is greater than or equal to 26° and less than or equal to 30°, and d3 is greater than or equal to 1 / 3d2 and less than or equal to 1 / 2d2 to improve the effect of dust and air separation.

[0058] Combined with Figure 4 , the upper separator 1 and the lower separator 2 are fixed. The dust removal device 100 includes a fixing screw 5. The head of the fixing screw 5 passes through the third hole 231 and is assembled in the first hole 171 and screwed and fixed with the positioning part 18 in the second hole 181 to fix the upper separator 1 and the lower separator 2.

[0059] After the upper separator 1 and the lower separator 2 are fixed, the edge 24 is located outside the positioning part 18, the first step part and the second step part are adapted, and the abutting part 19 is located in the recessed groove 221 to increase the stability of the fixation of the upper separator 1 and the lower separator 2 and reduce the air leakage probability between the upper separator 1 and the lower separator 2.

[0060] In some embodiments, the lower separator 2 supports the upper separator 1 from below, and there is no fixed relationship between the two.

[0061] Refer Figures 2 to 4 And Figures 10 to 12 , in some embodiments, the dust removal device 100 includes a mounting bracket (not labeled), and its lower end has an air inlet 811. The inner wall of the lower separator 2 forms a funnel-shaped first cavity 21 and partially extends into the lower end of the mounting bracket. The inner wall of the upper separator 1 forms a cylindrical second cavity 11 and is mechanically coupled to the upper end of the lower separator 2. The second cavity 11 is connected to the first cavity 21 to form a dust removal cavity. The fan 3 is mechanically coupled to the upper end of the upper separator 1. The fan 3 is configured such that when the fan 3 operates, the gas inhaled from the air inlet 811 of the mounting bracket passes through the dust removal cavity to separate dust, so that the gas with separated dust is blown out from the air outlet 30 of the fan 3 to the window of the camera assembly.

[0062] In some embodiments, the air inlet 811 of the mounting bracket includes a grid structure.

[0063] In some embodiments, the air inlet 811 of the mounting bracket extends longitudinally and is evenly distributed around the radial direction of the lower separator 2.

[0064] In some embodiments, the axis of the grid structure of the air inlet 811 of the mounting bracket is tangent to the inner wall of the lower separator 2.

[0065] In some embodiments, the mounting bracket includes a first mounting bracket 7 and a second mounting bracket 81. The fan 3 is fixed to the first mounting bracket 7, and at least part of the upper separator 1 is located in the space surrounded by the first mounting bracket 7, and air enters the air inlet 12 after passing through the second mounting bracket 81. The second mounting bracket 81 can filter larger particle dust, improve the dust removal effect, prevent noise caused by the collision of larger particle dust with the upper separator 1 or the lower separator 2, prevent more dust from falling into the dust collection cavity 41, and extend the service life.

[0066] In some embodiments, the second mounting bracket 81 is fixed to the first mounting bracket 7, for example, by means of a snap fastener or screw locking.

[0067] In some embodiments, the mounting brackets include a second mounting bracket 81 and a third mounting bracket 82, both of which have multiple grid-structured air inlets 811, and the second mounting bracket 81 and the third mounting bracket 82 are configured such that their respective grid structures are staggered.

[0068] In some embodiments, the second mounting bracket 81 is fixed to the third mounting bracket 82, for example, by means of a snap fastener or screw locking.

[0069] In some embodiments, the second mounting bracket 81 and the third mounting bracket 82 are stacked along the height direction of the dust removal device 100.

[0070] In some embodiments, the fan 3 may also be fixed to the upper separator 1.

[0071] In some embodiments, the first mounting bracket 7 includes a top 71 and a wall 72 extending from the top 71, and a laterally disposed fixing part 73 extending from the wall 72. The upper separator 1 is located within the space enclosed by the top 71 and the wall 72. The fixing part 73 is located outside the wall 72 and extends vertically, enabling lateral mounting and fixing of the dust removal device 100.

[0072] In some embodiments, fixing screws 731 can be assembled on the fixing part 73 to fix the dust removal device 100.

[0073] The fan 3 is fixed to the top 71. The fan 3 is fixed to the top 71 by the first screw 31.

[0074] The first ear 17 of the upper separator 1 is fixed to the top 71 by the second screw 10, and the first hole 171 is used for the second screw 10 to pass through.

[0075] In some embodiments, a seal 32 is provided between the fan 3 and the top 71 to prevent air leakage between the fan 3 and the top 71.

[0076] In some embodiments, the top 71 is provided with a perforation 711, which communicates with the air outlet channel 131 to allow air to be released, or to allow the top of the protruding post 13 to pass through.

[0077] In some embodiments, the second mounting bracket 81 is located below the first mounting bracket 7 and is annular. The second mounting bracket 81 is provided with a channel 810 for the upper separator 1 or the lower separator 2 to pass through, so as to prevent the air with dust from directly entering the air inlet 12 without passing through the second mounting bracket 81.

[0078] In some embodiments, the second mounting bracket 81 is fixed to the enclosure 72.

[0079] In some embodiments, the second mounting bracket 81 is fixed to the enclosure 72 by a buckle, which facilitates the disassembly of the second mounting bracket 81 for maintenance. In other embodiments, the second mounting bracket 81 and the enclosure 72 can also be fixed by screws or bolts.

[0080] In some embodiments, the second mounting bracket 81 includes an air inlet 811 and an outlet 812. The air inlet 811 faces the dust collection part 4, and the air inlet 811 and the outlet 812 are arranged offset in the height direction of the second mounting bracket 81 to extend the path of the air passing through the second mounting bracket 81 and improve the filtering effect.

[0081] In some embodiments, one or more air inlets 811 can be provided, and the multiple air inlets 811 are arranged in sequence along the circumferential direction of the second mounting bracket 81.

[0082] In some embodiments, one or more outlets 812 can be provided, and the multiple outlets 812 are arranged in sequence along the circumferential direction of the second mounting bracket 81.

[0083] In some embodiments, one or more second mounting brackets 81 can be provided, and the multiple second mounting brackets 81 are fixed to each other. For example, they can be fixed by buckles or connected by screws or bolts. <00,00211>In some embodiments, the second mounting bracket 81 includes two layers of grids, each layer has n fan blades, the two layers of grids are staggered by the angle of one fan blade along the central axis, and two second mounting brackets 81 are stacked to form four layers of grids, so that part of the large particle dust is filtered before the air with dust enters the second cavity 11, that is, primary filtration is carried out. <00,00213>In some embodiments, the structure of the third mounting bracket 82 is the same as that of the second mounting bracket 81, which will not be elaborated here. The structure of the third mounting bracket 82 can also be different from that of the second mounting bracket 81.

[0086] In some embodiments, a filter element, such as a filter screen, can also be provided at the air inlet 12 to filter larger particle dust.

[0087] See Figures 13 to 16As shown, in some embodiments, the dust collection unit 4 includes a main body 42 and a cover plate 43 connected to the main body 42. The main body 42 forms a dust collection chamber 41, and the cover plate 43 can switch between an open state and a closed state to open and close the dust collection chamber 41 for easy dumping of dust.

[0088] In some embodiments, the dust removal device 100 includes a dust collection assembly (not shown), which includes a dust collection section 4 and a motor 9.

[0089] In some embodiments, the dust collection assembly is mechanically coupled to the lower end of the lower separator 2 so that dust separated in the dust removal chamber by the gas drawn in through the air inlet 811 of the mounting bracket falls to the dust collection assembly.

[0090] In some embodiments, the dust collection assembly has an openable cover 43, and the motor 9 drives the cover 43 to switch between an open state and a closed state, which can realize automatic dust cleaning, making it more user-friendly; and can solve the problem of excessive dust in the dust collection chamber 41 due to manual cleaning and not being cleaned in time, thereby improving the dust removal effect.

[0091] In some embodiments, the lower separator 2 is fixed to the main body 42, for example, by means of screws or clips.

[0092] In some embodiments, the motor 9 is fixed to the main body 42, and the motor shaft of the motor 9 is connected to the cover plate 43 to rotate the cover plate 43 so as to open and close the cover plate 43.

[0093] In some embodiments, the motor shaft of the motor 9 is fixed to the cover plate 43 by a third screw 44 to eliminate the amount of shaking after assembly.

[0094] In some embodiments, a torsion spring 431 is provided on the cover plate 43, and the elastic force of the torsion spring 431 can cause the cover plate 43 to automatically switch to the closed state.

[0095] In some embodiments, the dust collection unit 4 includes a bushing 46 fixed to the main body 42, and the cover plate 43 includes a rotating shaft 432, which is rotatably connected to the bushing 46.

[0096] In some embodiments, the torsion spring 431 is fitted onto the rotating shaft 432.

[0097] In some embodiments, the bushing 46 has a plurality of protrusions 461 in the shaft hole, which contact the rotating shaft 432 to reduce friction during rotation.

[0098] In some embodiments, the dust collection unit 4 includes a bearing fixed to the bushing 46, the outer ring of the bearing being fixed to the bushing 46, and the rotating shaft 432 being fixed to the inner ring of the bearing to increase the smoothness of rotation.

[0099] In some embodiments, the dust collection unit 4 includes a sealing device 45 located within the dust collection chamber 41, a portion of which extends out of the body 42 to fit and seal against the cover plate 43 to prevent air or dust leakage from the gap between the cover plate 43 and the body 42.

[0100] A portion of the sealing device 45 is located inside the dust collection chamber 41, which not only facilitates the fixing of the sealing device 45, but also improves the sealing effect of the dust collection chamber 41; and when the sealing device 45 is too dirty, the sealing device 45 can also be replaced.

[0101] In some embodiments, the sealing device 45 is made of silicone rubber with a hardness of 45HA. The sealing device 45 is bonded to the main body 42 by adhesive backing. When the cover plate 43 is closed, it is interference-fitted with the sealing device 45 to achieve the sealing of the dust collection chamber 41.

[0102] In some embodiments, the dust collection unit 4 can be detached from the lower separator 2, and the dust collection unit 4 can be removed to empty and blow out the dust.

[0103] In some embodiments, the dust collection part 4 is a dust collection bag or the like, and this application does not limit the shape and material of the dust collection part 4.

[0104] The dust removal device 100 of this application embodiment is relatively small in size and can be applied to small products with dust removal needs. It filters some large dust particles by installing a bracket, and then uses a small cyclone separator structure composed of upper separator 1 and lower separator 2 to separate particles in a certain size range in the air and blow out relatively clean gas. The dust collection unit 4 and motor 9 realize the functions of automatic dust collection and emptying, thus achieving the purpose of dust removal and maintenance-free operation.

[0105] It should be noted that the technical solutions or features described in the above embodiments can be combined or supplemented with each other without conflict. The scope of protection of this application is not limited to the precise structures described in the above embodiments and shown in the accompanying drawings; all modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A dust removal device characterized by comprising: The dust removal device comprises: an upper separator provided with a second cavity and an air inlet communicating with the second cavity, the upper separator comprising a protruding column extending into the second cavity, the protruding column surrounding an air outlet channel communicating with the second cavity; a lower separator located below the upper separator and surrounding a first cavity communicating with the second cavity, at least part of the first cavity being funnel-shaped; a fan located above the upper separator, the suction of the fan causing air to enter the second cavity through the air inlet; a dust collecting part located below the lower separator and surrounding a dust collecting cavity communicating with the first cavity.

2. The dust extraction device of claim 1, wherein The lowest end of the air inlet is higher than the lowest end of the protruding column.

3. The dust extraction device of claim 1, wherein The upper separator comprises a top wall, a side wall extending downward from the top wall, and a protruding portion extending laterally from the side wall, the protruding column being formed by extending downward from the top wall, the air inlet being provided on the protruding portion, the direction of the air inlet being tangent to the circumferential direction of the side wall.

4. The dust extraction device of claim 3, wherein The air inlet is rectangular, the length of the air inlet being defined as a, the width of the air inlet being defined as b, the diameter of the air outlet channel being defined as d1, the height of the air outlet channel being defined as h, the diameter of the second cavity being defined as d2, and the height of the second cavity being defined as H, a / b being greater than or equal to 2 and less than or equal to 3, a being greater than or equal to 0.4d2 and less than or equal to 0.75d2, b being greater than or equal to 0.2d2 and less than or equal to 0.25d2, d1 being greater than or equal to 0.4d2 and less than or equal to 0.65d2, h being greater than or equal to 0.8a, H being greater than or equal to 1.5d2 and less than or equal to 2d2.

5. The dust extraction device of claim 4, wherein, The taper angle of the first cavity is defined as a, a being greater than or equal to 26° and less than or equal to 30°, and the diameter of the ash outlet of the first cavity is defined as d3, d3 being greater than or equal to 1 / 3d2 and less than or equal to 1 / 2d2.

6. The dust extraction device of claim 1, wherein The dust removal device comprises a first mounting bracket and a second mounting bracket fixed with the first mounting bracket, the fan being fixed with the first mounting bracket, at least part of the upper separator being located in the space surrounded by the first mounting bracket, the lower separator being fixed with the upper separator, and air entering the air inlet through the second mounting bracket.

7. The dust extraction device of claim 6, wherein The second mounting bracket is located below the first mounting bracket and is annular, the second mounting bracket being provided with a channel for the upper separator or the lower separator to pass through.

8. The dust extraction device of claim 6, wherein, The second mounting bracket comprises an air inlet and an outlet, the air inlet facing the dust collecting part, the air inlet and the outlet being arranged in a staggered manner along the height direction of the second mounting bracket.

9. The dust extraction device of any one of claims 1 to 8, wherein, The dust collecting part comprises a main body and a cover plate connected with the main body, the cover plate being capable of being switched between an open state and a closed state to open and close the dust collecting cavity.

10. The dust extraction device of claim 9, wherein The dust removal device comprises a motor to drive the cover plate to switch between the open state and the closed state.

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