A dust removal device for building construction

Abstract

The present invention provides a dust removal device for building construction, which includes a spray head, a water supply component and an air supply component. The air supply component has an air outlet end, and the air outlet end is inserted into the air inlet to form a suction gap. When the air outlet end supplies air to the spray head, the spray head inhales external air through the suction gap, while ensuring the coverage range of the water mist sprayed by the spray head, reducing the air supply volume of the air outlet end, and adapting to the working conditions with a large dust content in the air; a separation member is provided near the air inlet in the spray head, and a collection member is provided near the water spray nozzle. Dust particles are separated from the inhaled external air through the separation member and collected through the collection member to efficiently remove dust from the inhaled external air and avoid clogging of the spray head.

Description

Technical Field

[0001] The present invention relates to a construction device, in particular to a dust removal device for construction. Background Art

[0002] With the continuous advancement of urbanization and the rapid development of the construction industry, the number of various new construction, renovation, and demolition projects has increased significantly. During the construction process, a large amount of dust pollutants will be generated in operation links such as earth excavation, building material cutting, concrete mixing, and wall demolition. These dusts not only contain components such as particulate matter (PM₁₀, PM₂.₅), cement ash, and sand debris, but may also be mixed with harmful chemical substances, causing continuous pollution to the construction site and the surrounding environment. Moreover, in open or semi-closed construction sites, dust is easily affected by air flow diffusion, forming a large-scale dust pollution, thereby reducing the air visibility, threatening the normal operation safety of construction machinery, and also causing long-term harm to the respiratory health of operating personnel. Therefore, construction parties need to adopt efficient and sustainable treatment measures to reduce the impact of construction activities on the ecological environment and public health.

[0003] Currently, the dust removal devices specifically used in the construction field that are gradually widely used spray water mist through nozzles to perform dust reduction treatment on the construction area. However, when the dust content in the air is relatively large, to increase the coverage range of the water mist sprayed by the nozzles, more air supply and water supply are required, resulting in an increase in resource consumption, and the nozzles are prone to blockage when inhaling dust-containing gas.

[0004] The information disclosed in the background art part of the present invention is only intended to deepen the understanding of the general background art of the present invention, and should not be regarded as an admission or any form of suggestion that this information constitutes the prior art known to those skilled in the art. Summary of the Invention

[0005] Based on this, it is necessary to provide a dust removal device for construction in view of the problems existing in the current construction dust removal devices.

[0006] The above object is achieved by the following technical solutions:

[0007] A dust removal device for construction includes a nozzle, a water supply assembly, and an air supply assembly. Oppositely arranged on the nozzle are a water spray nozzle and an air inlet. The water supply assembly has a water outlet end communicated with the water spray nozzle, and the air supply assembly has an air outlet end. The air outlet end is inserted into the air inlet and forms an air suction gap. When the air outlet end supplies air to the nozzle, the nozzle inhales external air through the air suction gap;

[0008] A separating member is provided near the air inlet in the spray head, and a collecting member is provided near the water spray nozzle. Dust particles are separated from the inhaled external air through the separating member and collected through the collecting member.

[0009] In one embodiment, the separating member includes a plurality of blades arranged at circumferential intervals, and the blades are arranged at an angle with their rotation plane. After passing through the blades, the inhaled external air rotates.

[0010] In one embodiment, the air outlet end faces the blades to generate a rotational force and a driving force on the blades. An obstructive member is provided in the spray head, and the obstructive member generates a rotational resistance on the blades, and the rotational resistance is positively correlated with the driving force.

[0011] In one embodiment, the separating member further includes a central disk, and a driving member is provided on the central disk. The driving member is used to adjust the angle between the blades and their rotation plane.

[0012] In one embodiment, the obstructive member is a first friction plate, a second friction plate is provided on the blade, and an elastic member is provided in the spray head. The elastic force of the elastic member makes the first friction plate abut against the second friction plate.

[0013] In one embodiment, a conductor disk is provided on the blade, the obstructive member is an electromagnet, and the electromagnet is close to the circumferential surface of the conductor disk.

[0014] In one embodiment, a rod body is provided in the spray head, and the first friction plate, the blade and the second friction plate are all slidably arranged on the rod body, and the blade and the second friction plate can rotate.

[0015] In one embodiment, the water supply assembly has a water delivery pipe, the air supply assembly has an air delivery pipe, and a plurality of the spray heads are arranged at intervals along a preset direction. The water flow direction in the water delivery pipe is opposite to the air flow direction in the air delivery pipe.

[0016] In one embodiment, a filter screen is provided in the air inlet of the spray head.

[0017] In one embodiment, a plurality of the water spray nozzles are arranged at circumferential intervals on the spray head, a water equalizing ring communicated with the plurality of water spray nozzles is provided on the spray head, and the water outlet end is communicated with the water equalizing ring.

[0018] The beneficial effect of the present invention is that when the air outlet supplies air to the nozzle, the nozzle inhales external air through the intake gap, thereby reducing the air supply volume of the air outlet while ensuring the coverage range of the water mist sprayed by the nozzle, and adapting to working conditions with a large dust content in the air. The dust particles are first separated from the inhaled external air by the separation component and are collected by the collecting component to efficiently remove dust from the inhaled external air and avoid clogging of the nozzle. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the overall structure of a dust removal device for construction provided by an embodiment of the present invention;

[0020] Figure 2 for Figure 1 A partial cross-sectional view of a dust removal device for use in construction;

[0021] Figure 3 for Figure 2 A partial enlarged view of point A in the middle;

[0022] Figure 4 for Figure 2 A front view of a dust removal device for construction;

[0023] Figure 5 for Figure 4 A cross-sectional view of a dust removal device for construction along the BB axis;

[0024] Figure 6 for Figure 5 The motion state change diagram of the dust removal device used in construction;

[0025] Figure 7 for Figure 5 A partial enlarged view of point C in the middle;

[0026] Figure 8 for Figure 6 A partial enlarged view of point D in the middle;

[0027] Figure 9 for Figure 7 Structural deformation diagram of dust removal device used in construction.

[0028] in:

[0029] 100, nozzle; 101, spray nozzle; 102, air inlet; 103, suction gap; 104, water pump; 105, air pump; 106, mounting bracket; 107, filter screen; 108, water distribution ring; 110, separating member; 111, collecting member; 112, blade; 113, obstructing member; 114, central disk; 115, first friction plate; 116, second friction plate; 117, elastic member; 118, conductor disk; 119, electromagnet; 120, rod body; 121, fixing rod; 122, baffle; 200, water supply assembly; 201, water outlet end; 202, water delivery pipe; 300, air supply assembly; 301, air outlet end; 302, air delivery pipe. Detailed implementation manners

[0030] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0031] The serial numbers assigned to the components in this text itself, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meanings. The "connection" and "coupling" mentioned in the present invention, unless otherwise clearly specified and defined, both include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0032] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature may be that the first feature is directly above or obliquely above the second feature, or simply means that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "under" the second feature may be that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower horizontal height than the second feature.

[0033] Such as Figures 1 to 9As shown in the figure, an embodiment of the present invention provides a dust removal device for building construction, which includes a spray head 100, a water supply component 200 and a gas supply component 300. The spray head 100 is relatively provided with a water spray nozzle 101 and an air inlet 102. The water supply component 200 has a water outlet end 201 communicated with the water spray nozzle 101. The gas supply component 300 has a gas outlet end 301. The gas outlet end 301 is inserted into the air inlet 102 and forms a suction gap 103. When the gas outlet end 301 supplies gas to the spray head 100, the spray head 100 inhales external air through the suction gap 103;

[0034] A separation member 110 is provided in the spray head 100 near the air inlet 102, and a collection member 111 is provided near the water spray nozzle 101. Dust particles are separated from the inhaled external air through the separation member 110 and collected through the collection member 11,1.

[0035] When the gas outlet end 301 supplies gas to the spray head 100, the spray head 100 inhales external air through the suction gap 103, while ensuring the coverage range of the water mist sprayed by the spray head 100, reducing the gas supply volume of the gas outlet end 301, adapting to the working conditions with a large dust content in the air. First, the dust particles are separated from the inhaled external air through the separation member 110, and then collected through the collection member 111, so as to efficiently remove dust from the inhaled external air and avoid the blockage phenomenon of the spray head 100.

[0036] Among them, the gas outlet end 301 has a flared outlet, so that the blown air has a certain diffusibility. The blown air has a certain pressure and flow rate, and generates a low pressure near the suction gap 103, so as to inhale external air under the action of atmospheric pressure.

[0037] Among them, referring to Figure 5 、 Figure 6 , the spray head 100 can be assembled by two parts. One is used to set the separation member 110, and the other is used to set the collection member 111. For the part provided with the collection member 111, its inner diameter gradually decreases from far to near the water spray nozzle 101, so as to increase the flow rate of the air ejected from the spray head 100 and improve the spray effect. In addition, the collection member 111 can be made of electrostatic materials, such as polypropylene, polyester fiber, etc., and adsorb charged dust particles through permanent electrostatic charges; or, the inner surface of the collection member 111 can be coated with a viscous material, such as silica gel, resin or polymer gel, which has the ability to efficiently capture dust particles; of course, the collection member 111 can also be other materials or structures that can adsorb and collect dust particles, which are not limited here.

[0038] Preferably, referring to Figure 3 , the separation member 110 includes a plurality of blades 112 arranged at circumferential intervals. The blades 112 are arranged at an angle with their rotation plane. After passing through the blades 112, the inhaled external air rotates.

[0039] Since the blade 112 is arranged at an angle with respect to its rotation plane, the inhaled external air flows along the inclined blade 112, and then rotates after passing through the blade 112 to generate centrifugal force, thereby throwing out dust particles and separating them from the inhaled external air.

[0040] Among them, the blown air is mixed with the inhaled external air and passes through the blade 112 with substantially the same path, pressure and flow rate. Therefore, the dust particles are actually separated from the mixed air of the blown air and the inhaled air. However, for the convenience of description, hereinafter, it is referred to as the dust particles being separated from the inhaled external air.

[0041] Of course, other methods that can separate dust particles from the inhaled external air can also be adopted, such as electrostatic precipitation, in which the dust particles are charged by a high-voltage electric field, and the charged particles migrate and deposit on the collecting member 111 under the action of the electric field force.

[0042] Preferably, the air outlet end 301 faces the blade 112 to generate a rotational force and a driving force on the blade 112. An obstructing member 113 is provided in the nozzle 100, and the obstructing member 113 generates a rotational resistance on the blade 112, and the rotational resistance is positively correlated with the driving force.

[0043] When the dust content in the air increases, the flow rate, pressure or flow rate of the blown air is controlled to increase. The rotational force and the driving force exerted by the blown air on the blade 112 both increase, the rotational resistance generated by the obstructing member 113 on the blade 112 increases, and the rotational speed of the blade 112 decreases, so that the centrifugal force generated by the rotation of the inhaled external air increases, thereby improving the dust removal effect on the inhaled external air.

[0044] Among them, the force exerted by the air blown from the air outlet end 301 on the blade 112 can be divided into a rotational force and a driving force that are perpendicular to each other. Among them, the rotational force is the tangential force received by the blade 112 to cause the blade 112 to rotate, so as to reduce the resistance to the incoming air, thereby reducing the flow rate consumption when the incoming air flows in the nozzle 100; the driving force is the axial force received by the blade 112 to cause the blade 112 to have a tendency to move away from the air outlet end 301. The rotational resistance is the force that restricts the rotation of the blade 112, which can be frictional force, magnetic force, an additional reverse torque or the resistance generated by the transmission system, etc.

[0045] As a structural deformation of the present invention, the separating member 110 further includes a central disk 114, and a driving member (not shown) is provided on the central disk 114, and the driving member is used to adjust the angle between the blade 112 and the rotation plane of the blade 112.

[0046] Among them, the driving member can be a motor and a plurality of motors are arranged at intervals along the circumferential direction of the central disk 114. The motor is configured with corresponding batteries and controllers to facilitate the start-stop and rotation angle control of its output end. The output end of the motor is arranged along the radial direction of the central disk 114 and is fixedly corresponding to the blade 112. The output end of the motor can drive the blade 112 to rotate, so as to adjust the angle between the blade 112 and its rotation plane, so as to change the centrifugal force generated by the rotation of the inhaled external air and adjust the dust removal effect on the inhaled external air.

[0047] Specifically, the blade 112 forms two angles with its rotation plane, and the sum of the two angles is 180°. The smaller the absolute value of the difference between the two angles, the greater the centrifugal force generated by the rotation of the inhaled external air, the better the dust removal effect, and at the same time, the smaller the resistance to air flow. The value range of each angle is (0°, 90°), such as 30°, 40°, 45°, 60°, etc. For example, compared with the two angles of 45° and 135° respectively, when the two angles are 60° and 120° respectively, the centrifugal force generated by the rotation of the blade 112 on the inhaled external air is greater and the resistance to air flow is smaller.

[0048] Preferably, the blocking member 113 is a first friction plate 115, a second friction plate 116 is provided on the blade 112, and an elastic member 117 is provided in the nozzle 100. The elastic force of the elastic member 117 makes the first friction plate 115 abut against the second friction plate 116.

[0049] When the dust content increases and the flow rate and pressure of the blown air are correspondingly increased, both the rotational force and the driving force generated by the air blown into the air outlet end 301 on the blade 112 increase. The increase in the driving force makes the second friction plate 116 on the blade 112 tend to move towards the first friction plate 115, making the second friction plate 116 and the first friction plate 115 abut more closely, and the frictional force therebetween, that is, the rotational resistance, also increases correspondingly. As a result, the rotation speed of the blade 112 decreases, and the centrifugal force generated by the rotation of the inhaled external air increases, thereby improving the dust removal effect on the inhaled external air.

[0050] Among them, the elastic member 117 is preferably a spring. When the elastic member 117 is arranged on the side of the blade 112 away from the air outlet end 301, the elastic member 117 is a compression spring. When the elastic member 117 is arranged on the side of the blade 112 close to the air outlet end 301, the elastic member 117 is a tension spring. The mutually approaching surfaces of the first friction plate 115 and the second friction plate 116 are friction surfaces, and anti-slip lines can be provided on the friction surfaces or made of materials with a large friction coefficient.

[0051] As a structural deformation of the present invention, see Figure 9 , a conductor disk 118 is provided on the blade 112, the blocking member 113 is an electromagnet 119, and the electromagnet 119 is close to the circumferential surface of the conductor disk 118.

[0052] Among them, the electromagnet 119 is configured with a corresponding power supply and a control module to control the generation of the magnetic field. A plurality of electromagnets 119 are arranged at intervals along the circumferential direction of the conductor disk 118 to provide a more stable and stronger magnetic induction intensity. When the blade 112 drives the conductor disk 118 to rotate, the conductor disk 118 continuously cuts the static magnetic field of the electromagnet 119. According to Faraday's law of electromagnetic induction, an annular current, that is, an eddy current, will be induced in the conductor disk 118. According to Lenz's law, a magnetic field opposite to the direction of the static magnetic field will be generated in the conductor disk 118. The reverse magnetic field interacts with the static magnetic field to generate a resistance torque opposite to the rotation direction of the conductor disk 118, that is, a braking torque. At the same time, the eddy current generates Joule heat due to the resistance in the conductor, converting the kinetic energy of the conductor disk 118 into heat energy to achieve deceleration.

[0053] Braking torque , B is the magnetic induction intensity, ω is the angular velocity, and r is the radius of the disk. That is to say, the braking torque T has a positive correlation with the magnetic induction intensity B. A magnetic field adjustment device can be set to change the magnetic induction intensity B of the static magnetic field generated by the electromagnet 119, making it have a positive correlation with the flow velocity, pressure of the blown-in air. For example, a flow velocity sensor, a pressure sensor, or a flow sensor is arranged in the air outlet end 301 to obtain the flow velocity, pressure, or flow signal of the blown-in air and send it to the processor. The processor adjusts the energizing current of the electromagnet 119 to change the magnetic induction intensity B of the static magnetic field it generates, so as to achieve: when the dust content increases and the flow velocity and pressure of the blown-in air are correspondingly increased, the magnetic induction intensity B is correspondingly increased, thereby increasing the braking torque T, making the rotational resistance received by the blade 112 increase and the rotational speed decrease, and the centrifugal force generated by the rotation of the inhaled external air increase. The specific circuit and structural design related to the electromagnet 119 are prior art and will not be elaborated here.

[0054] Preferably, a rod body 120 is arranged in the nozzle 100. The first friction plate 115, the blade 112, and the second friction plate 116 are all slidably arranged on the rod body 120, and the blade 112 and the second friction plate 116 can rotate.

[0055] When the driving force generated by the air outlet end 301 on the blade 112 is greater than the elastic force generated by the elastic member 117 on the first friction plate 115, the blade 112, the second friction plate 116, and the first friction plate 115 move synchronously, and the greater the movement amount of the blade 112, the greater the rotational resistance it receives.

[0056] One end of the rod body 120 is provided with a fixing rod 121 which is fixed inside the nozzle 100. The other end of the rod body 120 is provided with a baffle 122. One end of the elastic member 117 is fixed to the baffle 122, and the other end of the elastic member 117 is fixed to the first friction plate 115. The cross-section of the rod body 120 is circular. The first friction plate 115 is slidably sleeved on the rod body 120 through a first through hole opened at its center. The rod body 120 and the first through hole are slidably connected through a key and a keyway. A plurality of vanes 112 are arranged on the circumferential surface of the central disk 114. A second through hole is opened at the center of the central disk 114. The outer ring of a bearing is fixed inside the second through hole, and the inner ring of the bearing is slidably sleeved on the rod body 120. Of course, the inner ring of the bearing can be made of a smooth material to reduce the sliding friction force between it and the rod body 120.

[0057] Of course, the elastic member 117 may not be provided, or the elastic force of the elastic member 117 is infinitely large, that is, the vanes 112 and the second friction plate 116 can rotate and move along the rod body 120, while the first friction plate 115 does not move along the rod body 120. The blown air makes the second friction plate 116 always abut against the first friction plate 115. When the flow rate, pressure or flow rate of the blown air increases, the second friction plate 116 abuts against the first friction plate 115 more tightly, and the friction force, that is, the rotational resistance between the two, also correspondingly increases, so that the rotational speed of the vanes 112 decreases, and the centrifugal force generated by the rotation of the inhaled external air increases, thereby improving the dust removal effect on the inhaled external air.

[0058] Preferably, referring to Figure 1 、 Figure 2 、 Figure 4 The water supply assembly 200 has a water delivery pipe 202, the air supply assembly 300 has an air delivery pipe 302, and a plurality of nozzles 100 are arranged at intervals along a preset direction. The water flow direction in the water delivery pipe 202 is opposite to the air flow direction in the air delivery pipe 302.

[0059] When the water delivery pipe 202 or the air delivery pipe 302 is relatively long, the nozzles 100 far from the water pump 104 and the air pump 105 will generate pressure drops, resulting in a decrease in the pressure of the nozzles 100 and affecting the spray coverage range. By setting the water flow direction in the water delivery pipe 202 to be opposite to the air flow direction in the air delivery pipe 302, the problem of the end pressure drop caused by the excessive length of the water delivery pipe 202 or the air delivery pipe 302 is reduced, so that the water mist sprayed by each nozzle 100 throughout the process is basically in a uniform state.

[0060] Among them, the water delivery pipe 202 and the gas delivery pipe 302 are preferably arranged in parallel and can be connected by pipe fixing members. The water pump 104 is arranged at the first end of the water delivery pipe 202 or the gas delivery pipe 302, and its output end is communicated with the first end of the water delivery pipe 202. The air pump 105 is arranged at the second end of the water delivery pipe 202 or the gas delivery pipe 302, and its output end is communicated with the second end of the gas delivery pipe 302. The water pump 104 and the air pump 105 are configured with corresponding water sources or gas sources, as well as power supplies and controllers, so as to facilitate continuous water supply or gas supply. Of course, there may be a certain included angle between the water delivery pipe 202 and the gas delivery pipe 302. The preset direction can be the length direction of the water delivery pipe 202 or the gas delivery pipe 302, or other directions convenient for arranging multiple spray heads 100 at intervals. The spray head 100 is installed on the water delivery pipe 202 or the gas delivery pipe 302 or other arrangement devices through the mounting frame 106. An adjusting device can also be arranged on the mounting frame 106 to change the spraying orientation angle or spraying height of the spray head 100 for spraying.

[0061] Of course, a plurality of water pumps 104 and air pumps 105 can also be arranged at intervals along the preset direction, so that the water mist ejected from each spray head 100 tends to be uniform.

[0062] Preferably, referring to Figure 2 , a filter screen 107 is arranged in the air inlet 102 of the spray head 100 to preliminarily filter the inhaled external air. Of course, the filter screen 107 also has the function of separating the spray head 100 from the external space.

[0063] Preferably, referring to Figure 2 、 Figure 4 、 Figure 5 , a plurality of water spray nozzles 101 are arranged at intervals along the circumferential direction of the spray head 100. A water equalizing ring 108 communicated with the plurality of water spray nozzles 101 is arranged on the spray head 100. The water outlet end 201 is communicated with the water equalizing ring 108, so that the water spray nozzles 101 can spray water in a ring shape, forming a more uniform and wider spray range, and improving the spray effect.

[0064] In the present invention, by setting the water flow direction in the water delivery pipe 202 to be opposite to the air flow direction in the gas delivery pipe 302, the problem of tail-end pressure drop caused by the excessive length of the water delivery pipe 202 or the gas delivery pipe 302 is reduced, so that the water mist ejected by each spray head 100 is basically in a uniform state throughout the process.

[0065] During spraying, air is blown through the air outlet end 301 towards the nozzle 100, creating a low pressure near the air suction gap 103 and sucking in external air. While ensuring the coverage range of the water mist sprayed by the nozzle 100, the air supply volume of the air outlet end 301 is reduced, adapting to the working condition with a large dust content in the air. The dust particles are first separated from the inhaled external air by the separating member 110. Specifically, the inhaled external air flows along the inclined blades 112 and rotates to generate a centrifugal force, thereby throwing out the dust particles and separating them from the inhaled external air, and then collected by the collecting member 111 to efficiently remove dust from the inhaled external air and prevent the nozzle 100 from getting blocked.

[0066] When the dust content in the air increases, the flow rate, pressure or flow volume of the blown-in air is controlled to increase. Both the rotational force and the driving force exerted by the blown-in air on the blades 112 increase, and the rotational resistance generated by the blocking member 113 acting on the blades 112 increases, that is, the frictional force between the first friction plate 115 and the second friction plate 116 increases, causing the rotational speed of the blades 112 to decrease, and the centrifugal force generated by the rotation of the inhaled external air to increase, thereby improving the dust removal effect on the inhaled external air.

[0067] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0068] The above-described embodiments merely represent several implementation manners of the present invention, and their descriptions are relatively specific and detailed, but should not be construed as limiting the scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A dust removal device for building construction, characterized in that, It includes a nozzle, a water supply component and an air supply component. The nozzle is provided with a water spray nozzle and an air inlet oppositely. The water supply component has a water outlet end communicated with the water spray nozzle, and the air supply component has an air outlet end. The air outlet end is inserted into the air inlet and forms an air suction gap. When the air outlet end supplies air to the nozzle, the nozzle inhales external air through the air suction gap; A separating member is arranged near the air inlet in the nozzle, and a collecting member is arranged near the water spray nozzle. Dust particles are separated from the inhaled external air through the separating member and collected through the collecting member. The separating member includes a plurality of blades arranged at circumferential intervals. The blades are arranged at an angle with their rotation plane. After passing through the blades, the inhaled external air rotates; The air outlet end faces the blades to generate a rotational force and a driving force on the blades. An obstructing member is arranged in the nozzle, and the obstructing member generates a rotational resistance on the blades. The rotational resistance is positively correlated with the driving force.

2. The dust removal device for building construction according to claim 1, characterized in that, The separating member further includes a central disk, and a driving member is arranged on the central disk. The driving member is used to adjust the angle between the blade and the rotation plane of the blade.

3. The dust removal device for building construction according to claim 1, characterized in that, The obstructing member is a first friction plate, a second friction plate is arranged on the blade, and an elastic member is arranged in the nozzle. The elastic force of the elastic member makes the first friction plate abut against the second friction plate.

4. The dust removal device for building construction according to claim 1, characterized in that, A conductor disk is arranged on the blade, and the obstructing member is an electromagnet. The electromagnet is close to the circumferential surface of the conductor disk.

5. The dust removal device for building construction according to claim 3, characterized in that, A rod body is arranged in the nozzle. The first friction plate, the blade and the second friction plate are all slidably arranged on the rod body, and the blade and the second friction plate can rotate.

6. The dust removal device for building construction according to claim 1, characterized in that, The water supply component has a water delivery pipe, and the air supply component has an air delivery pipe. A plurality of the nozzles are arranged at intervals along a preset direction. The water flow direction in the water delivery pipe is opposite to the air flow direction in the air delivery pipe.

7. The dust removal device for building construction according to claim 1, characterized in that, A filter screen is arranged in the air inlet of the nozzle.

8. The dust removal device for building construction according to claim 1, characterized in that, A plurality of the water spray nozzles are arranged at circumferential intervals on the nozzle. A water equalizing ring communicated with the plurality of water spray nozzles is arranged on the nozzle, and the water outlet end is communicated with the water equalizing ring.

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