Dust removal device

Abstract

The application relates to the dust removal technical field, in particular to a dust removal device, which comprises a shell, a jet component and a dust suction part, the shell is formed with a dust removal chamber, the dust removal chamber is provided with an open window; the jet component is arranged in the dust removal chamber and can rotate around a preset axis, a jet end of the jet component faces the open window; the dust suction part is arranged on the shell and located around the jet component. The dust removal device can make the jet end rotate around the preset axis by rotating the jet component around the preset axis, so that a continuously rotating airflow is formed, the cleaning of the concave-convex material surface is completed by using small power and energy consumption, and the dust removal efficiency is high. The dust suction part is arranged around the jet component, dust blown up by the airflow can be timely sucked away, and secondary pollution of the dust is prevented.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of dust removal, in particular to a dust removal device. BACKGROUND

[0002] In the dust removal technology, it can be divided into two categories according to the dust removal method, that is, using liquid as dust removal medium and using gas as dust removal medium. The liquid medium is mainly water washing, which consumes resources, and the waste water needs to be treated, and then the water vaporization needs to be increased, which occupies a larger space in the flow line and has the risk of damaging the equipment. The cleaning method of gas medium provides clean gas source for the air knife of the fan. The air knife has the applications of blowing and drying and blowing and dust removal in the industrial field. The high-speed airflow blown by the air knife is used for dust removal of the dust removal part.

[0003] At present, the surface of the dust removal part can be divided into plane and concave-convex surface. The dust removal effect of the high-speed airflow blown by the air knife on the plane is also good, but the airflow is difficult to cover the concave area when the concave-convex surface is dusted. The dust removal distance of the ultrasonic dust removal has a higher requirement. The dust removal effect is best when the distance between the dust removal device and the material is about 2mm. The ultrasonic dust removal device has good effect on dust removal of the plane material. However, for the concave-convex surface material, the distance between the dust removal device and the material is much greater than 2mm. The high-speed airflow waveform of the plane strip ultrasonic wave is seriously attenuated, which affects the breaking of the viscous layer on the surface of the material and reduces the dust removal efficiency. Therefore, whether it is gas dust removal or ultrasonic dust removal, the dust removal cleanliness rate and efficiency of the concave area are low. Therefore, we need to design a dust removal device that can effectively dust the concave-convex surface part. SUMMARY

[0004] The present application provides a dust removal device to solve the problem of poor concave dust removal effect of the concave-convex surface material in the prior art.

[0005] The present application provides a dust removal device, comprising:

[0006] The shell is formed with a dust removal chamber having an open window;

[0007] The air injection assembly is arranged in the dust removal chamber and can rotate around a preset axis. The air injection end of the air injection assembly faces the open window.

[0008] The dust suction part is arranged on the shell and located around the air injection assembly.

[0009] In one possible design, the air injection assembly comprises:

[0010] The fixed seat is arranged on the shell;

[0011] The rotating seat is in rotational cooperation with the fixed seat. The first air duct is arranged on the fixed seat and the rotating seat. The rotating seat can rotate around the axis of the first air duct.

[0012] The nozzle is arranged on the rotating seat, and a second air channel is formed in the nozzle. The second air channel is communicated with the first air channel, and a torque for rotating the rotating seat around the axis of the first air channel is generated when compressed gas is sprayed from the second air channel.

[0013] In a possible design, a third air channel is formed in the nozzle, and an axis of the third air channel is arranged in a tangential direction of the rotating seat.

[0014] In a possible design, a normal projection of an axis of the second air channel on a preset plane coincides with or forms an acute angle with the tangential direction of the rotating seat, and the preset plane is a plane perpendicular to the axis of the first air channel.

[0015] In a possible design, the second air channel includes a gradually decreasing section and a gradually increasing section, the gradually decreasing section has a gradually decreasing diameter, the gradually increasing section has a gradually increasing diameter, and a narrow hole is formed at a position where the gradually decreasing section and the gradually increasing section are connected.

[0016] In a possible design, the shell includes:

[0017] an outer shell;

[0018] an inner shell located on an inner side of the outer shell, a dust removal chamber is formed on a side of the inner shell away from the outer shell, a negative pressure cavity is formed between the outer shell and the inner shell, an edge of the outer shell and an edge of the inner shell form a dust suction part, the negative pressure cavity is used to be communicated with a negative pressure device, and the dust suction part is located around the dust removal chamber;

[0019] a connecting part arranged between the outer shell and the inner shell and used to connect the outer shell and the inner shell, a fixing seat is arranged on the connecting part, and an air inlet channel communicated with the first air channel is formed in the connecting part and used to be communicated with an air compressor.

[0020] In a possible design, the edge of the inner shell forms a first arc-shaped part.

[0021] In a possible design, the edge of the outer shell forms a second arc-shaped part.

[0022] In a possible design, the first arc-shaped part is recessed toward the outer shell, and the second arc-shaped part is recessed toward the inner shell.

[0023] In a possible design, the device further includes an electrostatic eliminator arranged on the inner shell.

[0024] In a possible design, the device further includes:

[0025] a negative pressure pipe arranged on a surface of the outer shell, one end of the negative pressure pipe is communicated with the negative pressure cavity, and the other end of the negative pressure pipe is used to be communicated with the negative pressure device;

[0026] a quick plug connector arranged on the surface of the outer shell, one end of the quick plug connector is communicated with the air inlet channel, and the other end of the quick plug connector is used to be communicated with the air compressor.

[0027] The beneficial effects of the present application are as follows:

[0028] The dust removal device of the present application, the air injection end of the air injection assembly faces the open window, by rotating the air injection assembly around the preset axis, the air injection end can be rotated around the preset axis, thereby forming a continuously rotating air flow, achieving cleaning of the concave-convex material surface with smaller power and energy consumption, and high dust removal efficiency. By arranging the dust suction part around the air injection assembly, the dust blown up by the air flow can be sucked away in time, preventing secondary pollution of dust. The dust removal device has simple structure, compact structure, convenient assembly, integrated component installation, reduced component quantity, saved production cost, improved assembly efficiency and improved benefit. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the specific embodiments or prior art of the present application, the drawings needed to be used in the description of the specific embodiments or prior art will be briefly introduced as follows. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0030] Figure 1 Structure diagram of the dust removal device provided by the embodiment of the present application Figure One ;

[0031] Figure 2 Structure diagram of the dust removal device provided by the embodiment of the present application Figure Two ;

[0032] Figure 3 Structure diagram of the dust removal device provided by the embodiment of the present application

[0033] Figure 4 Top view of the dust removal device provided by some embodiments of the present application after assembly of the rotating seat and the nozzle

[0034] Figure 5 Top view of the dust removal device provided by some embodiments of the present application after assembly of the rotating seat and the nozzle

[0035] Figure 6 Structure diagram of the dust removal device provided by the embodiment of the present application

[0036] Figure 7 Structure diagram of the dust removal device provided by the embodiment of the present application

[0037] Reference signs:

[0038] 100, shell; 110, outer shell; 120, inner shell; 130, connecting part; 140, dust removal chamber; 150, negative pressure cavity; 160, first arc-shaped part; 170, second arc-shaped part; 200, dust suction part; 210, negative pressure hole; 300, air jet assembly; 310, fixing seat; 320, rotating seat; 330, nozzle; 340, adapter ring; 350, air inlet channel; 360, first air channel; 370, adapter air channel; 380, second air channel; 381, tapering section; 382, tapering section; 383, narrow hole; 390, third air channel; 400, static electricity eliminator; 410, mounting boss; 500, negative pressure pipe; 600, quick plug. DETAILED DESCRIPTION

[0039] The technical solutions of the present application will be described clearly and completely below in conjunction with embodiments. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0040] The technical solutions of the present application will be described clearly and completely below in conjunction with embodiments. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application. Figures 1-7 The dust removal device provided in the embodiments of the present application will be described below in conjunction with

[0041] Referring to FIG. 1, Figure 1 , Figure 2 A dust removal device provided by the embodiments of the present application includes a shell 100, an air jet assembly 300, and a dust suction part 200. The shell 100 is formed with a dust removal chamber 140 having an open window. For example, the shell 100 is rectangular or circular or other shapes, and one end of the shell 100 is open to form an open window for being close to the surface of a dust removal object. The air jet assembly 300 is arranged in the dust removal chamber 140 and can rotate around a preset axis. The air jet end of the air jet assembly 300 faces the open window and is used for blowing air to the surface of the dust removal object. The dust suction part 200 is arranged on the shell 100 and located around the air jet assembly 300, and is used for sucking away dust and gas together to prevent the dust blown from the dust removal object from causing secondary pollution to the dust removal object.

[0042] Referring to FIG. 1, Figure 3As shown, in some embodiments provided in the present application, the air jet assembly 300 comprises a fixed seat 310, a rotating seat 320 and a nozzle 330, the fixed seat 310 is fixedly installed on the shell 100; the rotating seat 320 is rotationally matched with the fixed seat 310 through a bearing, and a first air channel 360 is respectively formed on the fixed seat 310 and the rotating seat 320, the first air channel 360 is communicated with the air compressor, the first air channel 360 is a cylindrical hole, and the axis of the cylindrical hole coincides with the axis of the bearing, when the rotating seat 320 rotates around the axis of the first air channel 360, the axial communication of the two first air channels 360 is not affected; the nozzle 330 is arranged outside the rotating seat 320, for example, a adapter ring 340 is sleeved outside the rotating seat 320, the adapter ring 340 is provided with an adapter air channel 370 in the radial direction, the nozzle 330 is installed on the adapter ring 340, a second air channel 380 is formed on the nozzle 330, the second air channel 380 is a cylindrical hole, and the second air channel 380 is communicated with the first air channel 360 through the adapter air channel 370, when the compressed gas is jetted out of the second air channel 380, a counterforce can be generated on the nozzle 330, the counterforce has a component in the tangential direction of the rotating seat 320, so that a torque can be generated to drive the nozzle 330 to rotate the rotating seat 320 around the axis of the first air channel 360, thereby automatically rotating the nozzle 330.

[0043] Referring to Figure 4 As shown, in some embodiments, a third air channel 390 is formed on the nozzle 330, the third air channel 390 is communicated with the second air channel 380, and the axis of the third air channel 390 is arranged in the tangential direction of the rotating seat 320, so that when the compressed gas passes through the second air channel 380, part of the compressed gas will flow into the third air channel 390 and be jetted out of the third air channel 390, since the axis of the third air channel 390 is arranged in the tangential direction of the rotating seat 320, and the gas generates inertia when flowing out, when the gas separates from the nozzle 330, the inertia will keep the gas at a certain speed after flowing out, and the inertia force will push the nozzle 330 to rotate in the opposite direction, thereby realizing the automatic rotation of the nozzle 330. In some embodiments, the end of the nozzle 330 is inclined towards the shell 100, that is, the direction of the gas flow jetted out of the nozzle 330 is inclined outward, which is conducive to making the dust flow towards the shell 100, thereby facilitating the dust and gas to be quickly sucked away by the dust suction part 200.

[0044] Referring to Figure 5As shown, in some embodiments, the normal projection of the axis of the second air channel 380 on a preset plane coincides with or forms an acute angle with the tangent direction of the rotating seat 320, the preset plane being a plane perpendicular to the axis of the first air channel 360; when the normal projection of the axis of the second air channel 380 on the preset plane coincides with the tangent direction of the rotating seat 320, the tip of the nozzle 330 faces the rear side of the rotating seat 320, that is, the direction of the air flow sprayed from the nozzle 330 is obliquely rearward, and the obliquely rearward air flow generates a forward pushing force on the nozzle 330, so that the nozzle 330 can maintain rotation; when the normal projection of the axis of the second air channel 380 on the preset plane forms an acute angle with the tangent direction of the rotating seat 320, for example, the angle between the normal projection of the axis of the second air channel 380 on the preset plane and the tangent direction of the rotating seat 320 is 60°, at this time, the tip of the nozzle 330 faces the rear side of the rotating seat 320 and also faces outward to the shell 100, that is, the direction of the air flow sprayed from the nozzle 330 is obliquely rearward and obliquely outward, which can maintain the rotation of the nozzle 330 and is conducive to making the dust flow in the direction close to the shell 100, so as to facilitate the dust suction part 200 to quickly suck away the dust and gas.

[0045] In some embodiments, the number of nozzles 330 can be multiple, for example, the number of nozzles 330 is two, and the two nozzles 330 are centrally symmetrically arranged relative to the rotating seat 320, so as to increase the air flow spraying position and improve the dust removal efficiency. In some embodiments, the distance between one of the two nozzles 330 and the rotating seat 320 is different from the distance between the other nozzle 330 and the rotating seat 320, so as to form two cleaning rings, which is conducive to increasing the dust removal area and improving the cleaning efficiency and cleanliness.

[0046] Referring to 7, in some embodiments provided by the present application, the second air passage 380 comprises a tapered section 381 and an increasing section 382, the diameter of the tapered section 381 gradually decreases, the diameter of the increasing section 382 gradually increases, and the position where the tapered section 381 and the increasing section 382 are connected forms a narrow hole 383. In the tapered section 381, the airflow follows the principle that "the smaller the cross section, the faster the flow rate", so the airflow is constantly accelerated, and when it reaches the narrow hole 383, the flow rate has already exceeded the speed of sound; while the transonic fluid no longer follows the principle that "the smaller the cross section, the faster the flow rate", but just the opposite, the larger the cross section, the faster the flow rate; therefore, in the increasing section 382, the speed of the airflow is further accelerated to 2-3 kilometers per second, which is 7-8 times the speed of sound, so the flow rate of the airflow is effectively increased, and at the moment when the high-speed compressed gas is ejected from the nozzle 330, the compressed gas will generate ultrasonic waves, which will approach the surface of the dust removal object under the carrying of the airflow, and under the joint action of the ultrasonic waves and the high-speed airflow, the dust on the surface of the dust removal object will be fully vibrated, the vibrated dust will be mixed with the airflow, and will be sucked away by the dust suction part 200 on the shell 100, so as to complete the high-efficiency dust removal. Especially when used for dust removal on concave-convex surfaces, under the joint action of the ultrasonic waves and the high-speed airflow, the dust in the dead angle area of the concave surface can also be fully vibrated, so as to break the air adhesion layer on the surface of the dust removal object, realize the surface cleaning of the concave-convex material with smaller power and energy consumption, and achieve good dust removal effect and high efficiency.

[0047] Referring to 6, in some embodiments provided by the present application, the shell 100 comprises an outer shell 110, an inner shell 120, and a connecting portion 130. The inner shell 120 is located inside the outer shell 110, and a dust removal chamber 140 is formed on the side of the inner shell 120 away from the outer shell 110. A negative pressure cavity 150 is formed between the outer shell 110 and the inner shell 120. Specifically, a negative pressure pipe 500 is mounted on the surface of the outer shell 110. One end of the negative pressure pipe 500 is in communication with the negative pressure cavity 150, and the other end is in communication with a negative pressure device. The edge of the outer shell 110 and the edge of the inner shell 120 form a dust suction portion 200. Specifically, the dust suction portion 200 comprises an end plate connected to the edge of the outer shell 110 and the edge of the inner shell 120. Negative pressure holes 210 in communication with the negative pressure cavity 150 are uniformly arranged on the end plate. In this way, the dust suction portion 200 is located around the dust removal chamber 140, which can prevent dust and airflow after oscillation from leaking out of the dust removal chamber 140. The connecting portion 130 is arranged between the outer shell 110 and the inner shell 120, and is used to connect the outer shell 110 and the inner shell 120. A threaded groove is arranged at the lower end of the connecting portion 130. A threaded section is arranged on a fixing seat 310. The threaded section and the threaded groove are threadedly connected to allow the fixing seat 310 to be mounted on the connecting portion 130. An air inlet 350 in communication with a first air duct 360 is arranged on the connecting portion 130. The air inlet 350 is used to communicate with an air compressor. Specifically, a quick connector 600 is mounted on the surface of the outer shell 110. One end of the quick connector 600 is in communication with the air inlet 350, and the other end is in communication with the air compressor. The compressed gas generated by the air compressor enters the air inlet 350, the first air duct 360, and the second air duct 380 in sequence through the quick connector 600, and is finally sprayed out at the end of the nozzle 330.

[0048] Referring to 6, in some embodiments provided by the present application, the edge of the inner shell 120 forms a first arc-shaped portion 160. In this way, the path of the gas flowing along the surface of the inner shell 120 is increased, so the speed of the airflow is increased. The speed of the airflow is inversely proportional to the pressure of the gas. Therefore, the speed of the airflow of the first arc-shaped portion 160 is large, and the pressure is small. On the one hand, it is beneficial to accelerate the gas carrying dust in the dust removal chamber 140 to flow to the negative pressure hole 210, speed up the dust removal, and improve the dust removal speed. On the other hand, after the pressure of the gas is reduced, the influence of the self-weight of the dust and the cohesion of the dust on the fusion state of the dust and the gas is reduced, so that the fusion of the dust and the gas is better, the dust is prevented from being too heavy to be carried away by the airflow, and the dust removal and cleaning rate is improved. In some embodiments, the first arc-shaped portion 160 is recessed toward the outer shell 110. By recessing the first arc-shaped portion 160 toward the outer shell 110, the wall thickness of the inner shell 120 is reduced, so that the distance between the negative pressure hole 210 and the dust removal chamber 140 is shortened, and the arc surface near the first arc-shaped portion 160 can maintain a relatively strong negative pressure, so that the dust can enter the negative pressure cavity 150 as soon as possible. In some embodiments, the first arc-shaped portion 160 can also be designed to protrude from the arc surface of the inner shell 120.

[0049] To prevent the gas flow from the nozzle 330 to drive part of the dust to overflow the shell 110 to cause secondary pollution, as shown in Figure 6, in some embodiments provided by the present application, the edge of the shell 110 is formed with a second arc-shaped portion 170. In this way, the path of the gas flowing along the surface of the shell 110 is increased, so the speed of the gas flow is increased, and the gas flow speed and gas pressure are inversely proportional, so the speed of the gas flow of the second arc-shaped portion 170 is larger and the pressure is smaller, which on the one hand is beneficial to make the dust overflowing the shell 110 flow to the negative pressure hole 210 with the gas acceleration; on the other hand, after the gas pressure is reduced, the influence of the dust self-weight and the dust cohesion on the fusion state of the dust and the gas is reduced, so that the fusion of the dust and the gas is better, preventing the dust from being carried away by the gas flow due to excessive gravity, and improving the dust cleaning rate. In some embodiments, the second arc-shaped portion 170 is recessed towards the inner shell 120, by recessing the second arc-shaped portion 170 towards the inner shell 120, the wall thickness of the shell 110 can be reduced, thereby shortening the distance between the negative pressure hole 210 and the outer side surface of the shell 110, so that the arc surface near the second arc-shaped portion 170 can maintain a relatively strong negative pressure, so that the dust can enter the negative pressure cavity 150 as soon as possible. In some embodiments, the second arc-shaped portion 170 can also be designed to protrude from the arc surface of the shell 110.

[0050] As shown in Figure 3, in some embodiments provided by the present application, the device further comprises an electrostatic eliminator 400, which is arranged on the inner shell 120. Specifically, a mounting boss 410 is arranged on the inner shell 120, and the electrostatic eliminator 400 is clamped on the mounting boss 410; the electrostatic eliminator 400 is connected to a power supply to release charges and neutralize the charges on the surface of the dust removal object, preventing electrostatic adsorption of dust and facilitating the dust to fall off the surface of the dust removal object. In other embodiments, the electrostatic eliminator 400 can also be installed at a position close to the negative pressure port of the shell 110.

[0051] The working principle of the dust removal device of the present application is as follows:

[0052] The compressed air is sprayed from the nozzle 330 through the air inlet 350, the first air channel 360 and the second air channel 380 to generate a high-speed airflow and ultrasonic waves, and the airflow reversely drives the nozzle 330 to rotate. The high-speed airflow with the ultrasonic waves acts on the surface of the dust-removing object to break the air adhesion layer and shake off the dust particles attached to the surface of the dust-removing object. The electrostatic eliminator 400 is connected to a power supply to release the electric charge and neutralize the electric charge of the dust adsorbed on the surface of the dust-removing object by electrostatic adsorption. Meanwhile, the negative pressure port of the negative pressure cavity 150 generates an airflow to form a negative pressure area, and the airflow carrying the dust is accelerated in the area and then enters the negative pressure cavity 150 to suck away the gas carrying the dust particles. Meanwhile, the airflow outside the dust removal chamber 140 is accelerated in the area and then enters the negative pressure cavity 150 to suck away the gas carrying the dust particles overflowing out of the shell 100, so as to realize efficient cleaning and dust removal of the surface of the dust-removing object. After the gas in the negative pressure cavity 150 is filtered by the filter unit, the air is cleaned and discharged to reduce the pollution to the environment.

[0053] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0054] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0055] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected or in communication with each other; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication or interaction relationship of two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0056] In this application, the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" mean that a particular feature, structure, material, or characteristic is included in at least one embodiment or example of the present application. The illustrative appearances of the above-mentioned terms in various places in the specification are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples. Moreover, the terms "first", "second", "third", etc. are used herein to describe various embodiments or examples and are not necessarily intended to denote a particular order, position, or priority of the elements being described. In addition, the terms "comprises", "comprising", "includes", "including", "has", "having", "contains", "containing", or any other similar word(s), are intended to be inclusive or open ended and not restrictive or exhaustive. In other words, the terms "comprises", "comprising", "includes", "including", "has", "having", "contains", "containing", or any other similar word(s), are intended to cover a special embodiment or example, but not exclude other embodiments or examples. In addition, the terms "an" and "one" are intended to be inclusive or open ended and not restrictive or exhaustive. In other words, the terms "an" and "one" are intended to cover both the singular aspect and the plural aspect, unless the context clearly indicates otherwise.

[0057] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary, and are not to be interpreted as limiting the present application, and that the ordinary skilled person in the art can make changes, modifications, replacements, and variations to the above-described embodiments within the scope of the present application.

Claims

1. A dust removal device characterized by comprising: The utility model relates to a dust removal device, comprising: a shell forming a dust removal chamber with an open window; a jet assembly arranged in the dust removal chamber and capable of rotating about a preset axis, a jet end of the jet assembly facing the open window; a dust suction part arranged on the shell and located around the jet assembly. The shell comprises: an outer shell; an inner shell located inside the outer shell, a side of the inner shell away from the outer shell forming the dust removal chamber, a negative pressure cavity being formed between the outer shell and the inner shell, edges of the outer shell and the inner shell forming the dust suction part, the negative pressure cavity being used for communication with a negative pressure device, the dust suction part being located around the dust removal chamber; an edge of the inner shell forming a first arc-shaped part; an edge of the outer shell forming a second arc-shaped part; the first arc-shaped part being recessed towards the outer shell, and the second arc-shaped part being recessed towards the inner shell.

2. The dust extraction device of claim 1, wherein The jet assembly comprises: a fixed seat arranged on the shell; a rotating seat in rotational cooperation with the fixed seat, the fixed seat and the rotating seat being provided with a first air channel, the rotating seat being capable of rotating about an axis of the first air channel; a nozzle arranged on the rotating seat, the nozzle being provided with a second air channel, the second air channel being in communication with the first air channel, and capable of generating a moment of force to rotate the nozzle and the rotating seat about the axis of the first air channel when compressed gas is sprayed from the second air channel.

3. The dust extraction device of claim 2, wherein: The nozzle is provided with a third air channel, an axis of the third air channel being arranged along a tangent direction of the rotating seat; and / or, a normal projection of an axis of the second air channel on a preset plane coincides with or forms an acute angle with the tangent direction of the rotating seat, the preset plane being a plane perpendicular to the axis of the first air channel.

4. The dust extraction device of claim 2, wherein: The second air channel comprises a gradually decreasing section and a gradually increasing section, a diameter of the gradually decreasing section gradually decreasing, and a diameter of the gradually increasing section gradually increasing, a position where the gradually decreasing section and the gradually increasing section are connected forming a narrow hole.

5. The dust extraction device of claim 4, wherein Further comprising: a connecting part arranged between the outer shell and the inner shell and used for connecting the outer shell and the inner shell, the fixed seat being mounted on the connecting part, the connecting part being provided with an air inlet channel in communication with the first air channel, the air inlet channel being used for communication with an air compressor.

6. The dust extraction device of claim 5, wherein: Further comprising an electrostatic eliminator arranged on the inner shell.

7. The dust extraction device of claim 5, wherein: Further comprising: a negative pressure pipe arranged on a surface of the outer shell, one end of the negative pressure pipe being in communication with the negative pressure cavity, and the other end of the negative pressure pipe being used for communication with a negative pressure device; a quick plug connector arranged on the surface of the outer shell, one end of the quick plug connector being in communication with the air inlet channel, and the other end of the quick plug connector being used for communication with the air compressor.

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