Dust explosion-proof air curtain

Abstract

The utility model discloses a dust explosion -proof air curtain belongs to the technical field of explosion -proof equipment, including air curtain module and air cylinder module, air curtain module fixed mounting is on the wall, and air curtain module sets up in the safety area, and air cylinder module can be detachably installed in the output end of air curtain module, and air cylinder module sets up in the dust dangerous area. The utility model discloses a dust explosion -proof air curtain belongs to the technical field of explosion -proof equipment, including air curtain module and air cylinder module, air curtain module fixed mounting is on the wall, and air curtain module sets up in the safety area, and air cylinder module can be detachably installed in the output end of air curtain module, and air cylinder module sets up in the dust dangerous area. The utility model discloses a dust explosion -proof air curtain belongs to the technical field of explosion -proof equipment, including air curtain module and air cylinder module, air curtain module fixed mounting is on the wall, and air curtain module sets up in the safety area, and air cyclinder module can be detachably installed in the output end of air curtain module, and air cylinder module is set up in the dust dangerous area.

Description

Technical Field

[0001] This utility model relates to the field of explosion-proof equipment technology, specifically to a dust explosion-proof air curtain. Background Technology

[0002] An explosion-proof air curtain is a special type of equipment used in industrial environments where explosive hazardous substances are present. Its core function is to create a uniform and stable airflow curtain to isolate different areas, thereby effectively preventing combustible dust or gas from spreading or intruding from the hazardous area to the safe area. It is one of the important facilities to ensure safe production.

[0003] However, traditional explosion-proof air curtains typically integrate core components such as motors and control systems with air outlet components, and install them as a whole in dust hazard areas. This layout means that although the core electrical equipment itself has an explosion-proof structure, it is still in a high-concentration dust environment for a long time. This not only increases the risk that the equipment may become an ignition source due to aging seals and wear of components, but also brings great safety hazards and high costs to daily maintenance and repair.

[0004] Therefore, how to provide a dust explosion-proof air curtain that overcomes the shortcomings of existing technologies is a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] Therefore, this utility model provides a dust explosion-proof air curtain to solve the problems of large safety hazards and high maintenance costs caused by the fact that traditional explosion-proof air curtains are installed as a whole in dust hazard areas.

[0006] To achieve the above objectives, this utility model provides the following technical solution: This utility model discloses a dust explosion-proof air curtain, comprising: An air curtain module is fixedly installed on the wall and is located in a safe area; A duct module is detachably installed at the output end of the air curtain module, and the duct module is located in a dust hazard area.

[0007] Furthermore, the air curtain module includes: The air curtain shell is a hollow structure with openings on the front and bottom walls; Front cover plate, installed on the front side wall of the air curtain housing; An explosion-proof air outlet is installed on the bottom wall of the air curtain housing; A junction box is installed on the top wall of the air curtain housing; An explosion-proof motor is installed inside the air curtain housing; The air curtain blades are mounted on the output end of the explosion-proof motor via a coupling.

[0008] Furthermore, the duct module includes: The guide duct is a multi-segment curved structure with openings at both ends, and is detachably installed on the output end of the air curtain module; The second explosion-proof air outlet is installed at the output end of the guide duct.

[0009] Furthermore, it also includes a reverse-current check component, the reverse-current check component comprising: An installation frame is disposed inside the guide duct, and two air vents are formed on the bottom wall of the installation frame; A pair of anti-reverse plates are hinged to the bottom wall of the mounting frame, and the anti-reverse plates are used to close the air duct. A sealing rubber ring is provided on the top wall where the anti-reverse plate contacts the mounting frame; Torsion spring seats, arranged in pairs, are disposed on the bottom wall of the mounting frame, and a shaft is provided between the two torsion spring seats; Several torsion springs are sleeved on the outer side wall of the shaft, and the two ends of the torsion springs abut against the bottom walls of the two anti-reverse plates respectively.

[0010] Furthermore, the corners of the guide duct are rounded.

[0011] Furthermore, the explosion-proof motor is a dual-output-shaft stepper motor.

[0012] Furthermore, the guide duct is made of engineering plastic.

[0013] This utility model has the following advantages: This invention physically separates the "safe zone" and the "hazardous zone" by setting up an air curtain module and an air duct module. The air curtain module is placed in the safe zone, while the air duct module extends to the dust hazard zone, which cuts off the path for electrical and mechanical sparks to come into contact with high concentrations of dust from the source, and completely eliminates the risk of the equipment itself becoming an ignition source. It is suitable for various dust explosion hazard locations.

[0014] By setting up a multi-segment, high-curvature bending structure and an internal airflow guide design, the airflow is fully optimized and rectified, resulting in a more uniform and precise airflow curtain that effectively blocks the diffusion and intrusion of dust, ensuring long-term reliable isolation.

[0015] The modular design of the air curtain and air duct modules allows for quick disassembly and replacement, significantly reducing maintenance time and downtime losses. More importantly, the core components, located in a low-dust, low-risk safe zone, experience a substantial reduction in wear and corrosion rates, extending the overall lifespan of the equipment and thus significantly lowering spare parts procurement and maintenance costs throughout its entire lifecycle.

[0016] By setting up a backflow prevention component, it is possible to effectively prevent dust in the hazardous area from flowing back into the air curtain module or even the safe area through the air duct module when the equipment is shut down, thereby further enhancing the safety and reliability of the system. Attached Figure Description

[0017] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0018] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0019] Figure 1 A three-dimensional view of the dust explosion-proof air curtain provided for this utility model; Figure 2 A cross-sectional view of the dust explosion-proof air curtain provided by this utility model; Figure 3 A perspective view of the anti-reverse component provided by this utility model; Figure 4 Provided by this utility model Figure 3 Enlarged view of the A-structure; Figure 5 This is a cross-sectional view of the anti-reverse component provided by this utility model.

[0020] In the diagram: 1. Air curtain module; 11. Air curtain housing; 12. Front cover plate; 13. Explosion-proof air outlet one; 14. Junction box; 16. Explosion-proof motor; 17. Air curtain blades; 2. Air duct module; 21. Guide duct; 22. Explosion-proof air outlet two; 3. Backflow prevention assembly; 31. Mounting frame; 32. Air duct; 33. Backflow prevention plate; 34. Sealing rubber ring; 35. Torsion spring seat; 36. Shaft; 37. Torsion spring. Detailed Implementation

[0021] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0022] Please refer to Figures 1-5 The dust explosion-proof air curtain disclosed in this utility model will now be described. This utility model consists of two parts, as follows: Figure 1 As shown, it includes an air curtain module 1 and an air duct module 2. The air curtain module 1 is fixedly installed on the wall and is located in a safe area. The air duct module 2 is detachably installed at the output end of the air curtain module 1 and is located in a dust hazard area.

[0023] In this embodiment, the explosion-proof core component—air curtain module 1—is physically separated from the air outlet execution component—air duct module 2. Air curtain module 1 can be placed in a safe area with low dust concentration and no explosion risk, such as an equipment room or control room, while only air duct module 2 extends into the dust hazard area. Air curtain module 1 and air duct module 2 adopt a modular design with standardized interfaces. During installation, air duct sections can be flexibly assembled according to site dimensions; during maintenance, there is no need for complete disassembly, only replacement of faulty components, significantly reducing maintenance difficulty and downtime, and adapting to the efficient operation and maintenance needs of industrial scenarios.

[0024] By setting up air curtain module 1 and air duct module 2, the "safe zone and dangerous zone" are physically separated. Air curtain module 1 is placed in the safe zone, while air duct module 2 is extended to the dust dangerous zone. This cuts off the path for electrical and mechanical sparks to come into contact with high-concentration dust at the source, completely eliminating the risk of the equipment itself becoming an ignition source. It meets the highest requirements of explosion-proof standards and is especially suitable for various dust explosion hazard locations such as flour milling, coal mining, and chemical processing plants.

[0025] like Figure 2 As shown, the air curtain module 1 includes an air curtain housing 11, a front cover plate 12, an explosion-proof air outlet 13, a junction box 14, an explosion-proof motor 16, and air curtain blades 17. The air curtain housing 11 is a hollow structure with openings on the front and bottom walls. The front cover plate 12 is installed on the front wall of the air curtain housing 11, the explosion-proof air outlet 13 is installed on the bottom wall of the air curtain housing 11, the junction box 14 is installed on the top wall of the air curtain housing 11, the explosion-proof motor 16 is installed inside the air curtain housing 11, and the air curtain blades 17 are installed on the output end of the explosion-proof motor 16 via a coupling. Preferably, the explosion-proof motor 16 is a dual-output-shaft stepper motor.

[0026] In this embodiment, the explosion-proof motor 16 is a dual-output-shaft stepper motor, and an explosion-proof housing is installed on the outside of the motor. The output shafts at both ends are connected to the air curtain blades 17 and placed inside the air curtain housing 11. A junction box 14 is installed on top of it. The front cover plate 12 is installed on the front side wall of the air curtain housing 11 by bolts. The middle part of the front cover plate 12 is an aluminum explosion-proof return air mesh, and the explosion-proof air outlet 13 is an aluminum explosion-proof air outlet.

[0027] The air curtain housing 11 is placed in a safe area for air intake. The explosion-proof motor 16 is a brushless explosion-proof motor to prevent spark leakage during operation. The air curtain housing 11 is equipped with a PLC controller and sensors, all of which are potted for explosion protection to prevent electrical sparks caused by poor circuit contact from being exposed. The air curtain housing 11 is made of 304 stainless steel with an anti-static spray coating to prevent static electricity from accumulating, attracting dust, or causing sparks.

[0028] The air curtain blades 17 are directly connected to the explosion-proof motor 16. They adopt an aerodynamic optimization design to generate strong airflow with low energy consumption, thereby forming a uniform air wall. The air outlet adopts a uniform opening design, which makes the airflow of the blown air curtain more evenly distributed and enhances the dustproof sealing.

[0029] The installation and adaptation components adopt standardized quick-release interfaces, allowing for flexible splicing or disassembly according to the width and height of the site. The air curtain shell 11 is installed on the wall via a fixed bracket, which is made of explosion-proof material and welded or bolted to the wall surface.

[0030] like Figure 1 , Figure 2 As shown, the ventilation duct module 2 includes a guide duct 21 and an explosion-proof air outlet 22. The guide duct 21 is a multi-segment curved structure with openings at both ends and is detachably installed on the output end of the air curtain module 1. The explosion-proof air outlet 22 is installed on the output end of the guide duct 21. Preferably, the corners of the guide duct 21 are rounded.

[0031] In this embodiment, the specific structure of the guide duct 21 is as follows: Figure 2 As shown, the guide duct 21 adopts a multi-segment, high-curvature curved structure, breaking through the traditional design concept of straight-line air ducts. By guiding the laminar flow of air, turbulence and airflow loss are reduced. Through the guidance and rectification of airflow within the curved channel, the blown air curtain airflow is made more uniform and more directional. The angle of the air curtain can be precisely adjusted according to the dust diffusion direction, improving the sealing and effectiveness of dust isolation. The guide duct 21 is mainly located in the dusty area, with one end connected to the air outlet of the air curtain module 1 and the other end placed in the dusty area.

[0032] The guide duct 21 is a crucial component connecting the air curtain module 1, undertaking the core functions of airflow guidance, rectification, and angle adjustment. Its design must simultaneously meet explosion-proof safety and dustproof effectiveness. The structural design employs a segmented splicing design, connected via standardized quick-release interfaces according to actual conditions. This method can adapt to different installation scenarios. The duct body adopts a large-curvature arc structure, and its outlet can be equipped with a manual or electric adjustment mechanism to adjust the air curtain's outlet angle.

[0033] Preferably, the guide duct 21 is made of engineering plastic. Based on the safety zoning, the guide duct 21 is made of antistatic and wear-resistant engineering plastic material, and the inner wall of the guide duct 21 is smoothed.

[0034] When the guide duct 21 is made of engineering plastic, it is injection molded in one piece, with a smooth inner wall, reducing the probability of dust adhesion; all splicing joints are equipped with explosion-proof sealing strips to ensure that the airtightness leakage rate is ≤0.1%, while preventing dust from entering the duct from the joints.

[0035] The guide duct 21 can also be made of conductive materials, such as brass or galvanized steel. When the guide duct 21 is made of metal, it adopts a seamless welding process, and the weld seam is ground and polished to avoid dust accumulation.

[0036] The synergistic design of "safety zoning" and "explosion-proof materials" enables it to cope not only with ordinary industrial dust, but also with special hazardous scenarios such as gas mines and toxic dust workshops. At the same time, the ventilation duct module 2 can be adaptively adjusted according to industrial doorways and spatial layouts of different widths and heights.

[0037] like Figure 3 , Figure 4 , Figure 5 As shown, it also includes a backflow prevention assembly 3, which includes a mounting frame 31, a backflow prevention plate 33, a sealing rubber ring 34, a torsion spring seat 35, and a torsion spring 37. The mounting frame 31 is located inside the guide duct 21, and two air inlets 32 are formed on the bottom wall of the mounting frame 31. The backflow prevention plates 33 are arranged in pairs and hinged to the bottom wall of the mounting frame 31. The backflow prevention plates 33 are used to close the air inlets 32. The sealing rubber ring 34 is located on the top wall of the backflow prevention plate 33 that contacts the mounting frame 31. The torsion spring seats 35 are arranged in pairs and located on the bottom wall of the mounting frame 31. A shaft 36 is provided between the two torsion spring seats 35, and several torsion springs 37 are sleeved on the outer side wall of the shaft 36. The two ends of the torsion springs 37 respectively abut against the bottom walls of the two backflow prevention plates 33.

[0038] In this embodiment, the anti-reverse plate 33 is normally closed under the action of the torsion spring 37, and only opens when the air curtain module 1 is activated to generate sufficient air pressure, ensuring unidirectional airflow. The sealing rubber ring 34 is located at the top of the anti-reverse plate 33 where it contacts the mounting frame 31.

[0039] By setting the anti-reverse component 3, it is possible to effectively prevent dust in the hazardous area from flowing back into the air curtain module 1 or even the safe area through the air duct module 2 when the equipment is stopped, thereby further enhancing the safety and reliability of the system.

[0040] Although the present invention has been described in detail above with general descriptions and specific embodiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A dust explosion-proof air curtain, characterized in that, include: An air curtain module (1) is fixedly installed on the wall and is located in a safe area; The air duct module (2) is detachably installed at the output end of the air curtain module (1), and the air duct module (2) is located in the dust hazard area.

2. The dust explosion-proof air curtain as described in claim 1, characterized in that, The air curtain module (1) includes: The air curtain shell (11) is a hollow structure with openings on the front side wall and the bottom wall; The front cover plate (12) is installed on the front side wall of the air curtain housing (11); An explosion-proof air outlet (13) is installed on the bottom wall of the air curtain housing (11); Junction box (14) is installed on the top wall of the air curtain housing (11); An explosion-proof motor (16) is installed inside the air curtain housing (11); The air curtain blade (17) is mounted on the output end of the explosion-proof motor (16) via a coupling.

3. The dust explosion-proof air curtain as described in claim 1, characterized in that, The air duct module (2) includes: The guide duct (21) is a multi-segment curved structure with openings at both ends, and can be detachably installed on the output end of the air curtain module (1); The second explosion-proof air outlet (22) is installed at the output end of the guide duct (21).

4. The dust explosion-proof air curtain as described in claim 3, characterized in that, It also includes a reverse-current check component (3), which includes: The mounting frame (31) is located inside the guide duct (21), and two air guides (32) are formed on the bottom wall of the mounting frame (31). Anti-reverse plates (33), arranged in pairs, are hinged to the bottom wall of the mounting frame (31), and the anti-reverse plates (33) are used to close the air duct (32). A sealing rubber ring (34) is provided on the top wall where the anti-reverse plate (33) contacts the mounting frame (31); Torsion spring seats (35) are arranged in pairs on the bottom wall of the mounting frame (31), and a shaft (36) is provided between the two torsion spring seats (35). Several torsion springs (37) are sleeved on the outer wall of the shaft (36), and the two ends of the torsion springs (37) respectively abut against the bottom walls of the two anti-reverse plates (33).

5. The dust explosion-proof air curtain as described in claim 3, characterized in that, The corners of the guide duct (21) are rounded.

6. The dust explosion-proof air curtain as described in claim 2, characterized in that, The explosion-proof motor (16) is a dual-output-shaft stepper motor.

7. The dust explosion-proof air curtain as described in claim 3, characterized in that, The guide duct (21) is made of engineering plastic.

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