Suspended double Laval structure local intelligent negative pressure dry fog cooling and dust removal device

Abstract

This invention discloses a suspended double Laval structure localized intelligent negative pressure dry fog cooling and dust removal device, comprising several negative pressure cooling and dust removal dry fog components and a piping system. The negative pressure cooling and dust removal dry fog components include a Laval air amplification device and a Laval wide-angle dry fog device. The Laval wide-angle dry fog device includes a water injection pipe and a Laval nozzle. A gap is left between the inner wall of the water injection pipe and the outer wall of the Laval nozzle to form a water storage chamber. L-shaped water pipes are arranged on both sides of the water injection pipe, and a nozzle is provided at the bottom end of the water injection pipe. An air injection connector is connected to the top end of the water injection pipe, and the top end of the Laval nozzle abuts against the air injection connector. An air injection port, communicating only with the Laval nozzle, is provided in the middle of the air injection connector, and a gap is left between the outer wall of the bottom end of the Laval nozzle and the inner wall of the nozzle's spray area. This device is low in cost, highly operable, has significant localized cooling and dust removal effects, and has minimal impact on coal miners.

Description

Technical Field

[0001] This invention relates to the field of coal mine dust removal technology, specifically to a suspended double Laval structure local intelligent negative pressure dry fog cooling and dust removal device. Background Technology

[0002] With the advancement of intelligent, mechanized, and automated mining in the coal industry, and the increasing depth of coal mining, dust concentrations have significantly increased, and the level of heat hazard has continuously intensified, seriously endangering the occupational health of coal miners. Methods such as ventilation for cooling and dust removal, which rely on increasing airflow to reduce mine temperature and dust concentration, have limited effectiveness, and conventional ventilation may not meet the corresponding safety regulations. Artificial cooling suffers from numerous drawbacks, including high cost, complex design and implementation, large heat emissions, and significant cooling losses, making widespread adoption difficult. Spraying water for cooling, as a low-cost and easily operable method for localized cooling and dust removal, suffers from large droplet sizes, making it difficult to achieve ideal dust and temperature reduction effects, and it can also cause dampness at the working face, negatively impacting the safety of coal miners. Summary of the Invention

[0003] This invention aims to solve the technical problems existing in the prior art. In particular, it innovatively proposes a local intelligent negative pressure dry fog cooling and dust removal device with a suspended double Laval structure. It is low in cost, highly operable, has obvious local cooling and dust removal effects, and has little impact on coal miners.

[0004] To achieve the above objectives, the present invention provides a local intelligent negative pressure dry fog cooling and dust removal device with a suspended double Laval structure, comprising a plurality of negative pressure cooling and dust removal dry fog components and a pipeline system for providing air and water to the negative pressure cooling and dust removal dry fog components. The pipeline system is provided with a plurality of pipe fixing and suspension components for adjusting the installation angle of the pipeline system at intervals along its extension direction. The pipeline system includes a ventilation pipe and two water pipes.

[0005] The negative pressure cooling and dust removal dry fog assembly includes a Laval air amplification device and a Laval wide-angle dry fog device located within the Laval air amplification device. The Laval wide-angle dry fog device includes a water injection pipe and a Laval nozzle fixedly installed inside the water injection pipe. The outer diameter of the Laval nozzle is smaller than the inner diameter of the water injection pipe, so that there is a gap between the inner wall of the water injection pipe and the outer wall of the Laval nozzle, forming a water storage chamber. L-shaped water pipes connected to two water pipes are provided on both sides of the water injection pipe. A nozzle is provided at the bottom end of the water injection pipe.

[0006] The top of the water injection pipe is connected to an air injection connector for blocking the top of the water flow channel, and the top of the Laval nozzle abuts against the air injection connector. The air injection connector has an air injection port in the middle that communicates only with the Laval nozzle. The air injection connector is used to communicate with the ventilation pipe. The bottom end of the Laval nozzle extends into the nozzle and is located near the nozzle's spraying part. A gap for water to flow out is left between the outer wall of the bottom end of the Laval nozzle and the inner wall of the nozzle's spraying part. An X-shaped vortex core is provided near the bottom end of the Laval nozzle. The X-shaped vortex core is used to spray out irregular airflow, thereby breaking the liquid sprayed from the nozzle into droplets.

[0007] In the above scheme: the Laval air amplification device includes a connecting cylinder that is open at the top and bottom. L-shaped ventilation pipes for connecting ventilation ducts are provided on both sides of the middle part of the connecting cylinder. The bottom end of the connecting cylinder is connected to a trumpet-shaped air outlet, and the top end of the air outlet is located inside the connecting cylinder and extends above the port of the L-shaped ventilation pipe. The top end of the air outlet has a windproof edge folded outward. The upper port of the connecting cylinder is connected to a trumpet-shaped negative pressure air inlet. The bottom end of the negative pressure air inlet extends into the connecting cylinder. The bottom end of the negative pressure air inlet is adjacent to the top end of the air outlet and has an annular gap for the gas in the L-shaped ventilation pipe to flow through.

[0008] The Laval air amplification device can increase convection, enhance the wind resistance and range of the spray, and further expand the cooling area.

[0009] Gas enters the L-shaped ventilation pipe from a short branch pipe of the ventilation duct, then enters the annular cavity and diffuses throughout the cavity. The annular slit connects to the annular cavity, the air amplifier throat, and the negative pressure air inlet. The annular slit adopts a Laval structure. When gas passes through the annular cavity and enters the annular slit, the gas is compressed, and its velocity and pressure increase. As it flows through the narrowest part of the annular slit, the pressure abruptly changes from positive to negative, the temperature decreases, and the velocity increases from subsonic to sonic. It then enters the expansion section, where the space slightly expands, the gas expands, its velocity increases again, and the pressure and temperature continue to rise. The air descends and flows rapidly out of the annular gap; the negative pressure air inlet is located above the annular gap. When the high-speed airflow from the annular gap is affected by the wall adhesion effect and flows along the wall, the negative pressure draws in the surrounding gas, reducing the pressure at the negative pressure air inlet and thus drawing in a large amount of air, which flows out of the air outlet along with the high-speed airflow through the air amplifier throat; the large amount of high-speed low-temperature gas ejected from the air outlet collides with the mist droplets ejected by the coaxial Laval wide-angle dry fog device, covering a wider range. At the same time, the evaporation and convection of the mist droplets can reduce the local temperature and improve the concentration of respirable dust.

[0010] In the above scheme: multiple coaxial guide rings are protruding from top to bottom on the outside of the Laval nozzle. The outer diameter of the coaxial guide ring is the same as the inner diameter of the water injection pipe. The outer side of the uppermost coaxial guide ring is provided with an external thread, and the inside of the water injection pipe is provided with an internal thread corresponding to the uppermost coaxial guide ring. A guide hole is vertically provided on the coaxial guide ring located below the L-shaped water pipe connection part.

[0011] In the above scheme: the airflow channel of the Laval nozzle is divided into an injection pipe section and a Laval pipe section arranged vertically. The inner diameter of the injection pipe section is the same from top to bottom. The Laval pipe section is divided into a Laval contraction section, a Laval throat, a Laval initial expansion section and a Laval outlet expansion section arranged sequentially from top to bottom. The X-shaped swirl core is arranged in the Laval outlet expansion section.

[0012] In the above scheme: the length of the Laval throat is 0.3 times its inner diameter.

[0013] In the above scheme: the pipe fixing and suspension assembly includes an angle-adjustable suspension device, and a pipe fixing device is suspended at the bottom of the angle-adjustable suspension device. The pipe fixing device is provided with a water pipe fixing through hole and a ventilation pipe fixing through hole respectively corresponding to the water pipe and the ventilation pipe.

[0014] In the above scheme: the angle adjustment suspension device includes a suspension fixing column, the bottom end of which is provided with a suspension fixing through hole extending forward and backward, and the top of the pipe fixing device is provided with connecting lugs located on the front and rear sides of the suspension fixing column. The middle of the connecting lugs on both sides is provided with a pipe fixing through hole corresponding to the suspension fixing through hole, and is fixed by hollow bolts that pass through both the pipe fixing through hole and the suspension fixing through hole.

[0015] In the above scheme: adjustment lugs are provided on both the left and right sides of the middle of the suspension fixing column. The adjustment lugs are provided with vertical adjustment through holes for studs to pass through. The bottom end of the stud is threaded with a through hole connector. The bottom end of the through hole connector has a horizontal through hole extending forward and backward. The through hole connectors on both sides of the connecting lug are provided with turning through holes and are fixed by hollow bolts that pass through both the through hole connectors and the turning through holes.

[0016] In the above scheme: each of the pipe fixing and suspension assemblies is equipped with an intelligent monitoring component; and two adjacent intelligent monitoring components are respectively arranged facing the left and right sides;

[0017] The intelligent monitoring component includes a telescopic bracket extending left and right, which is fixed to a pipe fixing device. An infrared camera and a dust concentration sensor are installed on the extended end of the telescopic bracket. In the above solution: both water pipes are connected to water pipe branch pipes corresponding to the L-shaped water pipes. Each negative pressure cooling dust removal dry fog component on the ventilation pipe is equipped with a duct connection unit. The duct connection unit includes a long duct branch pipe and two short duct branch pipes. The long duct branch pipe is used to connect to the air injection connector, and the short duct branch pipes are used to connect to the L-shaped ventilation pipe. The top end of the L-shaped ventilation pipe is provided with an internal threaded connector. Both ends of the internal threaded connector are provided with external threads for threaded connection with the L-shaped ventilation pipe and the short duct branch pipes, respectively.

[0018] In summary, the beneficial effects of this invention are:

[0019] 1. To address the overheating issue in localized areas not covered by the intake air supply, the irregular airflow from the installed Laval nozzles disperses the liquid sprayed by the Laval wide-angle dry fog device, generating low-temperature dry fog with higher particle size and concentration. This dry fog evaporates and absorbs heat, reducing the ambient temperature. Furthermore, it covers a wider area, further enhancing the heat absorption capacity in the localized area and effectively reducing the concentration of respirable dust, thus protecting the health of coal miners.

[0020] 2. By setting up an integrated Laval air amplification device and a Laval wide-angle dry fog device to work together, a double Laval structure is formed. The external Laval air amplification device increases the external air velocity and flow range, which drives the spray from the internal Laval wide-angle dry fog device to spread outward, increasing the convection effect, strengthening the wind resistance and spray range of the spray, further expanding the cooling area and improving the dust removal and cooling effect.

[0021] 3. By setting up a fixed suspension assembly for the pipeline, the installation angle of the pipeline system can be changed according to different airflow conditions in the tunnel, so that the spray coverage can accurately cover high-temperature and high-concentration scenarios.

[0022] 4. The low-temperature dry fog generated by evaporation and heat absorption, along with the decrease in ambient temperature, increases the water vapor content and relative humidity in the air. At this time, the efficient settling of respirable dust is achieved through the synergistic effect of the heterogeneous condensation and nucleation mechanism on the surface of fine particles and the inertial collision mechanism of droplets. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the device of the present invention.

[0024] Figure 2 Schematic diagram of a pipe fixing and suspension assembly.

[0025] Figure 3 Exploded view of the pipe fixing suspension assembly.

[0026] Figure 4 This is a schematic diagram of the intelligent monitoring component structure.

[0027] Figure 5 This is a schematic diagram of the pipeline system structure.

[0028] Figure 6 A 3D view of a negative pressure cooling and dust removal dry fog assembly.

[0029] Figure 7 A three-dimensional view of the Laval wide-angle dry fog apparatus.

[0030] Figure 8 This is a cross-sectional view of the Laval wide-angle dry fog apparatus.

[0031] Figure 9 This is a three-dimensional view of the Laval air amplification device.

[0032] Figure 10 This is a cross-sectional view of the Laval air amplification device.

[0033] Figure 11 This is a 3D view of a Laval nozzle.

[0034] Figure 12 This is a cross-sectional view of a Laval nozzle. Detailed Implementation

[0035] The present invention will be further described below with reference to the embodiments and accompanying drawings:

[0036] like Figures 1-12 As shown, a suspended double Laval structure local intelligent negative pressure dry fog cooling and dust removal device includes several negative pressure cooling and dust removal dry fog components 4000 and a pipeline system 3000 for providing air and water to the negative pressure cooling and dust removal dry fog components 4000. The pipeline system 3000 is provided with multiple pipe fixing and suspension components 1000 at intervals along its extension direction for adjusting the installation angle of the pipeline system 3000. The pipeline system 3000 includes a ventilation pipe 3200 and two water pipes 3100, wherein the two water pipes 3100 are respectively an inlet pipe and a return pipe; and are located on both sides of the ventilation pipe 3200.

[0037] The negative pressure cooling and dust removal dry fog assembly 4000 includes an integrated Laval air amplification device 4200 and a Laval wide-angle dry fog device 4100 located within the Laval air amplification device 4200. The Laval wide-angle dry fog device 4100 includes a water injection pipe 4110 and a Laval nozzle 4120 threadedly connected and fixed inside the water injection pipe 4110. The outer diameter of the Laval nozzle 4120 is smaller than the inner diameter of the water injection pipe 4110, creating a gap between the inner wall of the water injection pipe 4110 and the outer wall of the Laval nozzle 4120, forming a water storage chamber a. L-shaped water pipes 4113 are provided on both sides of the water injection pipe 4110, each connected to one of the two water pipes 3100. Each of the two water pipes 3100 is connected to a branch pipe 3110 corresponding to the L-shaped water pipe 4113. A nozzle 4130 is provided at the bottom end of the water injection pipe 4110. The distance between the branch pipes 3110 is 40 cm.

[0038] The Laval nozzle 4120 and the nozzle 4130 form a liquid pressurization zone through their internal primary contraction sections, accelerating liquid flow and achieving higher pressure. The long-diameter sections of the Laval nozzle 4120 and nozzle 4130 stabilize water pressure, reduce head loss, and help reduce water hammer effects. The Laval nozzle 4120 and the secondary contraction section form an adjustable liquid film, making the nozzle 4130 an adjustable liquid film nozzle. The guide orifice of the Laval nozzle 4120, in conjunction with the nozzle 4130, allows water from the storage chamber a to enter the liquid pressurization zone.

[0039] The top end of the water injection pipe 4110 is connected to an air injection connector 4111 for blocking the top of the water flow channel, and the top end of the Laval nozzle 4120 abuts against the air injection connector 4111. The air injection connector 4111 has an air injection port in its middle that communicates only with the Laval nozzle 4120, and is used to communicate with the ventilation pipe 3200. The bottom end of the Laval nozzle 4120 extends into the nozzle 4130 and is positioned near the nozzle's discharge portion, with a gap between the outer wall of the bottom end of the Laval nozzle 4120 and the inner wall of the nozzle's discharge portion for water flow. An X-shaped swirl core 4124 is positioned near the bottom end inside the Laval nozzle 4120. The X-shaped swirl core 4124 is used to eject irregular airflow, thereby breaking the liquid ejected from the nozzle 4130 into droplets.

[0040] The Laval nozzle 4120 has multiple coaxial guide rings protruding from top to bottom, with the outer diameter of the coaxial guide rings matching the inner diameter of the water injection pipe 4110. The outer side of the uppermost coaxial guide ring has an external thread, and the inner side of the water injection pipe 4110 has an internal thread corresponding to the uppermost coaxial guide ring. The external and internal threads enable the threaded connection between the water injection pipe 4110 and the Laval nozzle 4120, while also preventing deformation of the Laval nozzle 4120.

[0041] A vertically arranged guide hole 4122 is provided on the coaxial guide ring located below the connection part of the L-shaped water pipe 4113 to ensure liquid outflow. At the same time, the guide ring is provided with a groove for installing a rubber ring to achieve a seal between the water injection pipe 4110 and the Laval nozzle 4120.

[0042] The airflow passage of the Laval nozzle 4120 is divided into an injection pipe section 4121 and a Laval pipe section 4123, which are arranged vertically. The inner diameter of the injection pipe section 4121 is the same from top to bottom. The Laval pipe section 4123 is divided into a Laval contraction section b, a Laval throat c, a Laval initial expansion section d, and a Laval outlet expansion section e, arranged sequentially from top to bottom. The X-shaped swirl core 4124 is located in the Laval outlet expansion section e, and the length of the Laval throat c is 0.3 times its inner diameter. The angle of the Laval initial expansion section d is approximately 5° to 10° smaller than that of the Laval contraction section b, and the angle of the Laval outlet expansion section e gradually approaches 0°.

[0043] The curve equation for the initial expansion section d of the Laval nozzle 4120 cross-section is as follows: Where y is the ordinate, y * The x-coordinate is the ordinate of inflection point B, which is the point with the smallest radius in the contraction and expansion section of the Laval nozzle. B β is the x-coordinate of the turning point B. B is the maximum expansion angle, and x is the x-coordinate of any point.

[0044] The equation for the curve in section b of the Laval contraction is: Where r is the radius of the nozzle at any point, r * Let be the radius of the nozzle exit, x be the distance from the nozzle exit to any point, and l be the distance from the nozzle exit to the point where the nozzle contraction begins, which is the total length of the nozzle. c is a constant used to adjust the shape of the nozzle profile to meet specific design requirements.

[0045] Gas enters the coaxial water injection sleeve 4114 of the coaxial water injection pipe 4110 through the long duct branch 3220 of the ventilation duct 3200, and then flows into the gas injection pipe section 4121 of the Laval nozzle 4120. The gas continues to flow, passing through the Laval contraction section b, a process that further compresses the gas and increases its velocity. As the gas passes through the Laval throat c, the pressure instantly changes from positive to negative within a very small range, and the temperature decreases. Entering the initial expansion section d of the Laval nozzle 4120, the gas expands due to the increased space, its expansion velocity exceeding the flow velocity, generating a forward thrust that further increases the gas velocity, while the pressure and temperature continue to decrease. Subsequently, the gas enters the outlet expansion section e of the Laval nozzle 4120, where the gas velocity, pressure, and temperature gradually stabilize, forming a high-speed, negative-pressure, low-temperature gas flow. The gas, passing through the X-shaped swirling core 4124, diffuses evenly into the external space, impacting the adjustable liquid film formed by the Laval nozzle 4120 and the secondary contraction section 4133. During this process, the liquid film is uniformly broken into extremely fine droplets, which then diffuse evenly in all directions. Due to the low gas temperature, these fine droplets further reduce their temperature through convection. When the surrounding air temperature is high, these cooler droplets easily evaporate and absorb heat, thereby lowering the ambient temperature. Simultaneously, the formed water vapor increases the humidity of the air. As the device continues to operate, dust particles undergo heterogeneous nucleation on their surfaces, and the spray and particles collide inertially, achieving effective dust suppression of respirable dust.

[0046] The Laval air amplification device 4200 includes a connecting cylinder that is open at the top and bottom. L-shaped ventilation pipes 4220 for connecting to ventilation pipes 3200 are provided on both sides of the middle part of the connecting cylinder. The bottom end of the connecting cylinder is connected to a funnel-shaped air outlet 4270 that is smaller at the top and larger at the bottom. The top end of the air outlet 4270 is located inside the connecting cylinder and extends above the port of the L-shaped ventilation pipe 4220. An annular cavity 4230 is left between the top end of the air outlet 4270 and the inside of the connecting cylinder. The top end of the air outlet 4270 is folded outward with a wind baffle. The upper port of the connecting cylinder is connected to a funnel-shaped negative pressure air inlet 4260 that is larger at the top and smaller at the bottom. The bottom end of the negative pressure air inlet 4260 extends into the connecting cylinder. The bottom end of the negative pressure air inlet 4260 is adjacent to the top end of the air outlet 4270 and has an annular gap 4240 for the gas in the L-shaped ventilation pipe 4220 to flow through.

[0047] The Laval Air Amplifier 4200 can enhance convection, improve the wind resistance and range of the spray, and further expand the cooling area.

[0048] Each ventilation duct 3200 is equipped with a duct connection unit corresponding to each negative pressure cooling and dust removal dry fog assembly 4000. The duct connection unit includes a long duct branch 3220 and two short duct branch 3210s. The long duct branch 3220 connects to the air injection connector 4111, and the short duct branch 3210 connects to the L-shaped ventilation duct 4220. The top of the L-shaped ventilation duct 4220 is equipped with an internal threaded connector 4210, with external threads at both ends for threaded connection to the L-shaped ventilation duct 4220 and the short duct branch 3210, respectively. The two short duct branch 3210s are located on the front and rear sides of the long duct branch 3220, and both the short and long duct branch 3220s connect the ventilation duct 3200 to the negative pressure cooling and dust removal dry fog assembly 4000. The bottom of the negative pressure air inlet duct 4260 has the same inner diameter as the top of the air outlet duct 4270. The internal pipe of the nozzle 4130 consists of a primary contraction section 4131, a long diameter section 4132, a secondary contraction section 4133, and an expansion section 4134.

[0049] Gas enters the L-shaped ventilation pipe 4220 from the short duct branch 3210 of the ventilation duct 3200, and then enters the annular cavity 4230 and diffuses throughout the cavity. The annular gap 4240 is connected to the annular cavity 4230, the air amplifier throat 4250, and the negative pressure air inlet 4260. The annular gap 4240 adopts a Laval structure. When gas enters the annular gap through the annular cavity 4230, the gas is compressed, and its velocity and pressure increase. As it flows through the narrowest part of the annular gap 4240, the pressure suddenly changes from positive to negative, the temperature decreases, and the velocity increases from subsonic to sonic. Then it enters the expansion section, where the space slightly increases, the gas expands, the gas velocity increases again, and the pressure... The temperature continues to drop and flows out of the annular slit 4240 rapidly. The negative pressure air inlet 4260 is located above the annular slit 4230. When the high-speed airflow from the annular slit 4240 is affected by the wall adhesion effect and flows along the wall, the negative pressure draws in the surrounding gas, which reduces the pressure of the negative pressure air inlet 4260, thereby drawing in a large amount of air. This air flows out of the air outlet 4270 along with the high-speed airflow through the air amplifier throat 4250. The air outlet 4270 sprays out a large amount of high-speed, low-temperature gas, which collides with the droplets sprayed by the coaxial Laval wide-angle dry fog device 4100, covering a wider area. At the same time, the evaporation and convection of the droplets can reduce the local temperature and improve the concentration of respirable dust.

[0050] The pipe fixing and suspension assembly includes an angle-adjustable suspension device 1100, and a pipe fixing device 1200 is suspended at the bottom of the angle-adjustable suspension device 1100. The pipe fixing device 1200 is provided with a water pipe fixing through hole 1230 and a ventilation pipe fixing through hole 1240 respectively corresponding to the water pipe 3100 and the ventilation pipe 3200.

[0051] The angle-adjustable suspension device 1100 includes a suspension fixing column 1110. The bottom end of the suspension fixing column 1110 is provided with a suspension fixing through hole 1112 extending forward and backward. The top of the pipe fixing device 1200 is provided with connecting lugs located on the front and rear sides of the suspension fixing column 1110. The middle of the connecting lugs on both sides is provided with a pipe fixing through hole 1220 corresponding to the suspension fixing through hole 1112. The pipe fixing through hole 1220 is fixed by hollow bolts 1130 that pass through both the pipe fixing through hole 1220 and the suspension fixing through hole 1112. The hollow bolts 1130 are equipped with nuts 1150.

[0052] Adjustable lugs are provided on both the left and right sides of the middle of the suspension fixing column 1110. The adjustable lugs are provided with vertical adjustment through holes 1111 for studs 1120 to pass through. The bottom end of the stud 1120 is threadedly connected to a through hole connector 1140. The bottom end of the through hole connector 1140 is provided with a horizontal through hole 1142 extending back and forth. The through hole connectors 1140 on both sides of the connecting lug are provided with turning through holes 1210, and are fixed by hollow bolts 1130 that pass through both the through hole connector 1140 and the turning through hole 1210.

[0053] Each pipe fixed suspension assembly 1000 is equipped with an intelligent monitoring component 2000; and two adjacent intelligent monitoring components 2000 are respectively arranged facing the left and right sides;

[0054] The intelligent monitoring component 2000 includes telescopic brackets 2100 extending to the left and right. The telescopic brackets 2100 are fixed to the pipe fixing device 1200. An infrared camera 2200 and a dust concentration sensor 2300 are installed on the extended ends of the telescopic brackets 2100. The infrared camera 2200 and the dust concentration sensor 2300 monitor the temperature and dust concentration on the left and right sides of the device. When the temperature is abnormal or the dust concentration is too high, an electrical signal is sent to activate the device to cool down and remove dust.

Claims

1. A suspended double Laval structure local intelligent negative pressure dry fog cooling and dust removal device, characterized in that: It includes several negative pressure cooling and dust removal dry fog components (4000) and a piping system (3000) for providing air and water to the negative pressure cooling and dust removal dry fog components (4000). The piping system (3000) is provided with multiple pipe fixing and suspension components (1000) at intervals along its extension direction for adjusting the installation angle of the piping system (3000). The piping system (3000) includes a ventilation pipe (3200) and two water pipes (3100). The negative pressure cooling and dust removal dry fog assembly (4000) includes a Laval air amplification device (4200) and a Laval wide-angle dry fog device (4100) located inside the Laval air amplification device (4200). The Laval wide-angle dry fog device (4100) includes a water injection pipe (4110) and a Laval nozzle (4120) fixedly installed inside the water injection pipe (4110). The outer diameter of the Laval nozzle (4120) is smaller than the inner diameter of the water injection pipe (4110), so that there is a gap between the inner wall of the water injection pipe (4110) and the outer wall of the Laval nozzle (4120) to form a water storage chamber. L-shaped water pipes (4113) are provided on both sides of the water injection pipe (4110) and are respectively connected to two water pipes (3100). A nozzle (4130) is provided at the bottom end of the water injection pipe (4110). The top end of the water injection pipe (4110) is connected to an air injection connector (4111) for blocking the top end of the water flow channel, and the top end of the Laval nozzle (4120) abuts against the air injection connector (4111). The air injection connector (4111) has an air injection port in the middle that communicates only with the Laval nozzle (4120). The air injection connector (4111) is used to communicate with the ventilation pipe (3200). The bottom of the Laval nozzle (4120) The end extends into the nozzle (4130) and is positioned near the nozzle (4130) ejection part. A gap for water flow is left between the outer wall of the bottom end of the Laval nozzle (4120) and the inner wall of the nozzle (4130) ejection part. An X-shaped swirl core (4124) is provided near the bottom end of the Laval nozzle (4120). The X-shaped swirl core (4124) is used to eject irregular airflow, thereby breaking the liquid ejected from the nozzle (4130) into droplets.

2. The suspended double Laval structure local intelligent negative pressure dry fog cooling and dust removal device according to claim 1, characterized in that: The Laval air amplification device (4200) includes a connecting cylinder that is open at the top and bottom. L-shaped ventilation pipes (4220) for connecting to ventilation pipes (3200) are provided on both sides of the middle part of the connecting cylinder. The bottom end of the connecting cylinder is connected to a trumpet-shaped air outlet (4270), and the top end of the air outlet (4270) is located inside the connecting cylinder and extends above the port of the L-shaped ventilation pipe (4220). The top end of the air outlet (4270) is folded outward with a windproof edge. The upper port of the connecting cylinder is connected to a trumpet-shaped negative pressure air inlet (4260). The bottom end of the negative pressure air inlet (4260) extends into the connecting cylinder. The bottom end of the negative pressure air inlet (4260) is adjacent to the top end of the air outlet (4270) and leaves an annular gap (4240) for the gas in the L-shaped ventilation pipe (4220) to flow through.

3. The suspended double Laval structure local intelligent negative pressure dry fog cooling and dust removal device according to claim 1, characterized in that: The Laval nozzle (4120) has multiple coaxial guide rings protruding from top to bottom. The outer diameter of the coaxial guide ring is the same as the inner diameter of the water injection pipe (4110). The outer side of the uppermost coaxial guide ring is provided with an external thread, and the water injection pipe (4110) is provided with an internal thread corresponding to the uppermost coaxial guide ring. A guide hole (4122) is vertically provided on the coaxial guide ring located below the connection part of the L-shaped water pipe (4113).

4. The suspended double Laval structure local intelligent negative pressure dry fog cooling and dust removal device according to claim 3, characterized in that: The airflow channel of the Laval nozzle (4120) is divided into an injection pipe section (4121) and a Laval pipe section (4123) arranged vertically. The injection pipe section (4121) has the same inner diameter from top to bottom. The Laval pipe section (4123) is divided into a Laval contraction section (b), a Laval throat (c), a Laval initial expansion section (d), and a Laval outlet expansion section (e) arranged from top to bottom. The X-shaped swirl core (4124) is arranged in the Laval outlet expansion section (e).

5. The suspended double Laval structure local intelligent negative pressure dry fog cooling and dust removal device according to claim 4, characterized in that: The length of the Laval throat (c) is 0.3 times its inner diameter.

6. The suspended double Laval structure local intelligent negative pressure dry fog cooling and dust removal device according to claim 1, characterized in that: The pipe fixing and suspension assembly includes an angle-adjustable suspension device (1100), and a pipe fixing device (1200) is suspended at the bottom of the angle-adjustable suspension device (1100). The pipe fixing device (1200) is provided with a water pipe fixing through hole (1230) and a ventilation pipe fixing through hole (1240) corresponding to the water pipe (3100) and the ventilation pipe (3200), respectively.

7. The suspended double Laval structure local intelligent negative pressure dry fog cooling and dust removal device according to claim 6, characterized in that: The angle-adjustable suspension device (1100) includes a suspension fixing column (1110). The bottom end of the suspension fixing column (1110) is provided with a suspension fixing through hole (1112) extending forward and backward. The top of the pipe fixing device (1200) is provided with connecting lugs located on the front and rear sides of the suspension fixing column (1110). The middle part of the connecting lugs on both sides is provided with a pipe fixing through hole (1220) corresponding to the suspension fixing through hole (1112), and is fixed by hollow bolts (1130) that pass through both the pipe fixing through hole (1220) and the suspension fixing through hole (1112).

8. The suspended double Laval structure local intelligent negative pressure dry fog cooling and dust removal device according to claim 7, characterized in that: Adjustable lugs are provided on both the left and right sides of the middle part of the suspension fixing column (1110). The adjustable lugs are provided with vertical adjustment through holes (1111) for studs (1120) to pass through. The bottom end of the stud (1120) is threadedly connected to a through hole connector (1140). The bottom end of the through hole connector (1140) is provided with a horizontal through hole (1142) extending forward and backward. The through hole connectors (1140) on both sides of the connecting lug are provided with turning through holes (1210) and are fixed by hollow bolts (1130) that pass through both the through hole connector (1140) and the turning through hole (1210).

9. The suspended double Laval structure local intelligent negative pressure dry fog cooling and dust removal device according to claim 1, characterized in that: Each of the aforementioned pipe fixing and suspension assemblies (1000) is equipped with an intelligent monitoring component (2000); and two adjacent intelligent monitoring components (2000) are respectively arranged facing the left and right sides; The intelligent monitoring component (2000) includes a telescopic bracket (2100) extending to the left and right. The telescopic bracket (2100) is fixed on the pipe fixing device (1200). An infrared camera (2200) and a dust concentration sensor (2300) are provided on the extended end of the telescopic bracket (2100).

10. The suspended double Laval structure local intelligent negative pressure dry fog cooling and dust removal device according to claim 1, characterized in that: Both water pipes (3100) are connected to L-shaped water pipes (4113) via water pipe branch pipes (3110). Each ventilation pipe (3200) is equipped with a duct connection unit corresponding to each negative pressure cooling and dust removal dry fog component (4000). The duct connection unit includes a long duct branch pipe (3220) and two short duct branch pipes (3210). The long duct branch pipe (3220) is used to connect with the air injection connector (4111), and the short duct branch pipe (3210) is used to connect with the L-shaped ventilation pipe (4220). The top end of the L-shaped ventilation pipe (4220) is provided with an internal threaded connector (4210). Both the upper and lower ends of the internal threaded connector (4210) are provided with external threads for threaded connection with the L-shaped ventilation pipe (4220) and the short duct branch pipe (3210), respectively.

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