An explosion-proof fan

Abstract

The utility model discloses a kind of explosion-proof fan, including the casing of three-layer composite explosion-proof resin material and wind wheel, wherein outer layer carbon nanotube PEEK composite material effectively leads out static electricity, middle aluminium hydroxide flame-retardant layer prevents flame spread, inner layer ultra-high molecular weight polyethylene reduces friction spark risk.Electrostatic belt can effectively eliminate static electricity accumulation in transmission process, avoid static spark, improve explosion-proof safety.Fan is equipped with rotary electrostatic brush and ground copper wire to eliminate static electricity, and fire barrier is configured at air inlet to prevent flame propagation.Wind wheel blade is provided with tungsten-containing wear-resistant coating and zircon ceramic wear-resistant strip to avoid friction spark.Explosion-proof motor is built-in temperature sensor and vibration sensor, and stator winding adopts arc-resistant enameled wire.The utility model solves the problem of heavy weight and single protection of traditional fan through multiple explosion-proof design, with the characteristics of lightweight, superior explosion-proof performance, stable and reliable operation, especially suitable for flammable and explosive places such as petroleum and chemical industry.

Description

Technical Field

[0001] This utility model relates to the field of fan technology, and in particular to an explosion-proof fan. Background Technology

[0002] In flammable and explosive environments such as petroleum, chemical, and mining industries, traditional explosion-proof fans typically employ a design combining a metal casing with an explosion-proof motor. While this provides some explosion-proof performance, significant drawbacks remain: the metal casing is heavy, susceptible to corrosion, and may generate sparks under mechanical impact; while conventional resin fans are lightweight, their explosion-proof rating is insufficient, lacking effective protection against secondary ignition sources such as static electricity buildup and frictional heating. In existing technologies, flame arresters are mostly static structures with slow response times, unable to quickly block flame propagation in the early stages of deflagration; furthermore, the explosion-proof designs of the motor and impeller are often independent, lacking overall coordinated protection, leading to reduced system reliability. Moreover, traditional explosion-proof resin materials typically employ single modification methods, making it difficult to simultaneously meet the comprehensive requirements of antistatic properties, flame retardancy, and wear resistance, resulting in performance degradation during long-term operation. Utility Model Content

[0003] This utility model aims to solve at least one of the technical problems existing in the prior art. To this end, this utility model proposes an explosion-proof fan, which solves the problems of traditional fans being heavy and having only one type of protection through multiple explosion-proof designs. It features lightweight design, superior explosion-proof performance, and stable and reliable operation, and is particularly suitable for flammable and explosive environments such as petroleum and chemical industries.

[0004] The technical solution adopted by this utility model to solve its technical problem is:

[0005] An explosion-proof fan, including

[0006] The housing is provided with an air inlet and an air outlet, and the air inlet is provided with a flame arrester;

[0007] A rotating device includes a motor and a wind turbine. The motor is connected to the wind turbine via an anti-static belt. The motor is an explosion-proof motor. A rotating electrostatic brush is embedded in the shaft of the wind turbine, and a grounding copper wire is provided through the housing to conduct static charge. Both the wind turbine and the housing are made of explosion-proof resin, which has a three-layer composite structure including:

[0008] Outer layer: Carbon nanotube PEEK composite material;

[0009] Intermediate layer: Aluminum hydroxide flame retardant layer;

[0010] Inner layer: Ultra-high molecular weight polyethylene.

[0011] An explosion-proof fan according to an embodiment of this utility model has at least the following beneficial effects: The explosion-proof fan of this utility model achieves multiple safety protections through innovative design. It adopts a three-layer composite explosion-proof resin shell. The outer layer of carbon nanotube PEEK composite material effectively discharges static electricity, the middle aluminum hydroxide flame-retardant layer prevents flame spread, and the inner layer of ultra-high molecular weight polyethylene reduces the risk of frictional sparks. The anti-static belt effectively eliminates static electricity accumulation during transmission, avoiding static sparks and improving explosion-proof safety. The rotating electrostatic brush and grounding copper wire work together to completely eliminate the hidden danger of static electricity accumulation. The overall resin structure significantly reduces weight while avoiding metal-to-metal sparks. The inlet flame arrester can quickly block the propagation of explosions, forming double protection with the explosion-proof motor. This integrated design solves the problems of traditional fans such as large weight, single protection, and slow response, making it particularly suitable for long-term safe operation in flammable and explosive environments.

[0012] According to some embodiments of this utility model, the flame arrester is provided with a metal mesh filter element.

[0013] The benefits are that the metal mesh filter element inside the flame arrester can enhance the flame arresting effect, intercept the flame propagation path in multiple layers, and improve the explosion-proof reliability.

[0014] According to some embodiments of the present invention, the thickness of the outer layer is 0.8mm-1.2mm.

[0015] The advantage is that the outer layer thickness of 0.8mm-1.2mm ensures both static electricity discharge efficiency and mechanical strength and heat dissipation performance.

[0016] According to some embodiments of the present invention, the thickness of the intermediate layer is 2.0mm-3.5mm.

[0017] The advantage is that the 2.0mm-3.5mm thick intermediate layer provides optimal flame retardant protection and effectively absorbs the energy of an explosion.

[0018] According to some embodiments of this utility model, the thickness of the inner layer is 1.5mm-2.0mm.

[0019] The benefits are that the inner layer thickness of 1.5mm-2.0mm ensures a balance between wear resistance and airflow efficiency, extending service life.

[0020] According to some embodiments of the present invention, the blades of the wind turbine are provided with a tungsten-containing wear-resistant coating.

[0021] The benefits are that the tungsten-containing wear-resistant coating on the blades significantly improves their wear resistance and prevents the generation of metal particle sparks during long-term operation.

[0022] According to some embodiments of the present invention, the blades of the wind turbine are inlaid with zircon ceramic wear-resistant strips.

[0023] The benefits are that the zircon ceramic wear-resistant strips on the blade edges prevent foreign objects from impacting and sparking, thus enhancing safety under extreme operating conditions.

[0024] According to some embodiments of this utility model, the motor is equipped with a temperature sensor and a vibration sensor.

[0025] The benefits are that motor temperature and vibration monitoring enables fault early warning, allowing for the early detection of potential hazards and preventing accidents.

[0026] According to some embodiments of the present invention, the stator winding of the motor is impregnated with arc-resistant enameled wire.

[0027] The advantage is that the arc-resistant enameled wire of the stator winding improves the insulation performance and prevents the risk of explosion caused by electric sparks.

[0028] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of an embodiment of the present utility model;

[0031] Figure 2 for Figure 1 A side view;

[0032] Figure 3 for Figure 1 Schematic diagram of a medium flame arrester;

[0033] Figure 4 This is a schematic diagram of a rotary electrostatic brush.

[0034] Figure 5 This is a schematic diagram of a three-layer composite explosion-proof resin.

[0035] Figure 6 for Figure 1 A detailed schematic diagram of the wind turbine.

[0036] Reference numerals: housing 100, air inlet 110, air outlet 120, flame arrester 130, motor 140, impeller 150, anti-static belt 160, rotary electrostatic brush 170, grounding copper wire 180, outer layer 190, middle layer 200, inner layer 210, metal mesh filter element 220, zircon ceramic wear-resistant strip 230. Detailed Implementation

[0037] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0038] The following is for reference. Figures 1-6 An explosion-proof fan is described in detail with reference to a specific embodiment. It is to be understood that the following description is merely illustrative and not intended to limit the scope of the invention.

[0039] like Figures 1-2 As shown, this application proposes an explosion-proof fan including a housing 100 and a rotating device. The housing 100 is provided with an air inlet 110 and an air outlet 120, and a flame arrester 130 is installed at the air inlet 110. The rotating device includes a motor 140 and a fan wheel 150, with the motor 140 connected to the fan wheel 150 via an anti-static belt 160. Figure 4 As shown, a rotating electrostatic brush 170 is embedded in the shaft of the impeller 150 and conducts static charge through a grounded copper wire 180. The housing 100 and the impeller 150 are made of a three-layer composite explosion-proof resin material, including an outer layer 190 of carbon nanotube PEEK composite material, an aluminum hydroxide flame-retardant intermediate layer 200, and an ultra-high molecular weight polyethylene inner layer 210.

[0040] Among them, such as Figure 3 As shown, the flame arrester 130 is a device installed in the airflow channel to block flame propagation. Specifically, it can be implemented using a multi-layer metal mesh filter element 220, which rapidly absorbs combustion heat by increasing the contact area. The anti-static belt 160 is a transmission component with conductive properties, which can be implemented using carbon fiber reinforced rubber composite material to eliminate static charge generated by transmission friction. The rotary electrostatic brush 170 is a charge-discharging component that moves synchronously with the rotating shaft. Specifically, it can be implemented using a copper-based carbon fiber brush body, which continuously discharges accumulated charge through dynamic contact. Figure 5 As shown, the three-layer composite explosion-proof resin refers to a functional material that is laminated. The outer layer 190 uses a polyether ether ketone composite material dispersed with carbon nanotubes to achieve surface conductivity, the middle layer 200 uses a flame-retardant layer filled with aluminum hydroxide to block the spread of flames, and the inner layer 210 uses ultra-high molecular weight polyethylene to reduce the coefficient of friction.

[0041] Specifically, when the fan is running, airflow enters the housing 100 through the flame arrester 130 with a metal mesh filter element 220. The motor 140 drives the impeller 150 to rotate via an anti-static belt 160. A rotating electrostatic brush 170 on the shaft of the impeller 150 conducts the static charge generated by the rotation to the grounding copper wire 180. In the three-layer composite structure of the housing 100 and the impeller 150, the outer 190 carbon nanotube PEEK layer discharges surface static electricity, the middle aluminum hydroxide layer decomposes at high temperatures to absorb heat and block flames, and the inner 210 ultra-high molecular weight polyethylene reduces friction between the blades and the airflow. The explosion-proof motor 140 and the grounding system work together to form a complete static electricity elimination path.

[0042] Compared to existing technologies, traditional metal-cased 100 fans suffer from drawbacks such as heavy weight and susceptibility to collision sparks. This solution employs a lightweight resin structure to avoid metal-to-metal contact. Existing single-layer resin materials cannot simultaneously meet the requirements of conductivity and flame retardancy; this solution achieves multifunctional integration through a three-layer composite structure. Conventional flame arresters (130) rely on a single metal mesh, resulting in high airflow resistance; this solution balances flame-retardant efficiency and pressure drop loss by optimizing the filter element structure.

[0043] Through the above technical solution, this application effectively eliminates the explosion risk caused by static electricity accumulation in rotating parts and blocks the propagation path of flames in the airflow channel. The composite resin structure achieves a balance of antistatic, flame retardant, and wear-resistant properties while maintaining lightweight design. The collaborative work of the explosion-proof motor 140 and the monitoring module improves the reliability of system operation and is suitable for high-risk operating environments containing flammable and explosive gases.

[0044] This application further proposes that the flame arrester 130 incorporates a metal mesh filter element 220. The metal mesh filter element 220 refers to a mesh filter structure formed by multiple layers of woven metal wires. Specifically, it can be achieved using 316L stainless steel material, which is corrugatedly stacked and welded to form a honeycomb channel structure. The spacing between the metal mesh layers can be controlled within the range of 0.15-0.3 mm. This structure accelerates heat dissipation by increasing the flame contact area, while simultaneously reducing the flame temperature by utilizing the high thermal conductivity of the metal material. Specifically, when an explosive flame enters the flame arrester 130, the metal mesh filter element 220 forms a tortuous flow channel through multiple layers of interwoven metal wires, forcing the flame to split into tiny airflows. The surface of the metal mesh rapidly absorbs heat upon contact with the flame, reducing the flame temperature below the ignition point. The honeycomb channel structure, while maintaining airflow permeability, cuts off the flame propagation path through both physical barrier and thermal conduction.

[0045] Compared to existing technologies, traditional flame arresters 130 mostly employ single-layer metal plates or simple grid structures, which can only mechanically delay flame propagation. In contrast, the metal mesh filter element 220 in this solution, through optimized interlayer structure design, increases the effective flame-arresting area by approximately three times within the same volume. Furthermore, the high specific surface area of ​​the metal mesh significantly improves heat dissipation efficiency, reducing the response time to 40% of that of traditional structures. Through the above technical solutions, this application effectively solves the problems of low flame-arresting efficiency and slow response speed of traditional flame arresters 130. It can quickly block the flame propagation path in the initial stage of an explosion, preventing flames from entering the fan through the air inlet 110 and causing a secondary explosion, significantly improving the operational safety of the equipment in flammable and explosive environments.

[0046] This application further proposes that the thickness of the outer layer 190 is 0.8 mm to 1.2 mm. The outer layer 190 refers to a surface protective layer composed of carbon nanotube PEEK composite material, which can be achieved by hot pressing to combine carbon nanotubes with a polyetheretherketone (PEEK) matrix. This material has a conductive network structure. The thickness range refers to the axial dimension control range of the carbon nanotube PEEK layer, which can be achieved by adjusting the cavity depth of the injection mold. This thickness range can form a continuous conductive path. Specifically, when constructing the carbon nanotube PEEK composite material layer in the outer layer 190 of the explosion-proof resin shell 100, by controlling the thickness of this layer within the range of 0.8 mm to 1.2 mm, the conductive network formed by the carbon nanotubes inside the material has sufficient charge conduction capacity while maintaining the mechanical support properties of the matrix resin. This thickness range can balance the relationship between electrostatic discharge efficiency and structural strength, avoiding the problems of discontinuous conductive networks due to excessive thinness or decreased heat dissipation efficiency due to excessive thickness.

[0047] Compared with existing technologies, the traditional 190mm thickness design of the explosion-proof resin outer layer does not consider the synergistic relationship between conductive network construction and structural strength, often resulting in unstable electrostatic discharge due to the use of a single thickness value. This solution optimizes structural stability by limiting a specific thickness range, ensuring the material's conductivity while overcoming the defect of localized conductive failure under complex operating conditions caused by a single thickness value. Through the above technical solution, this application achieves stable output of the 190mm conductivity of the explosion-proof resin outer layer, effectively preventing the explosion risk caused by electrostatic accumulation, while maintaining the structural integrity of the shell 100, avoiding conductive network breakage due to mechanical deformation, and ensuring the safe operation of the explosion-proof fan under long-term vibration conditions.

[0048] This application further proposes that the thickness of the intermediate layer 200 is 2.0mm-3.5mm. The intermediate layer 200 refers to the structural layer located between the outer 190 carbon nanotube PEEK composite material and the inner 210 ultra-high molecular weight polyethylene. Specifically, it can be achieved by uniformly dispersing aluminum hydroxide particles in a resin matrix to form a flame-retardant layer. Its thickness range is determined through flame-retardant performance testing and mechanical strength testing. The aluminum hydroxide flame-retardant layer decomposes and absorbs heat at high temperatures, releasing water of crystallization, thus achieving its flame-retardant function by lowering the combustion temperature and diluting the oxygen concentration. Specifically, the thickness of the intermediate layer 200 is controlled within the range of 2.0mm-3.5mm. In the event of an explosion or combustion, this thickness allows the aluminum hydroxide flame-retardant layer to fully expand and form a dense carbonized layer, effectively blocking heat transfer to the interior of the shell 100. Simultaneously, this thickness range ensures that the flame-retardant layer will not undergo brittle fracture under explosive impact and avoids an increase in the overall weight of the shell 100 due to excessive thickness. During the manufacturing process, the thickness distribution of the intermediate layer 200 can be precisely controlled through molding, so that the flame retardant layer and the inner and outer layers 190 form a stable interface bond.

[0049] Compared to existing technologies, traditional explosion-proof fans typically employ a single-thickness design for their flame-retardant layer. If the layer is too thin, it cannot form a continuous barrier, leading to a risk of flame penetration; if it is too thick, it increases weight and easily causes internal stress concentration. This solution, by limiting the thickness range of the intermediate layer 200, optimizes the mechanical properties of the shell 100 while ensuring flame-retardant efficiency, resolving the technical contradiction between the flame-retardant layer thickness and explosion-proof performance. Through this technical solution, the intermediate layer 200 can absorb and disperse energy under explosive impact, slowing the flame propagation speed and preventing the shell 100 from softening and deforming due to high temperatures. The synergistic effect of the flame-retardant layer and the inner and outer layers 190 maintains the structural integrity of the shell 100, preventing secondary rupture during an explosion, thereby significantly improving the safety and service life of the explosion-proof fan.

[0050] This application further proposes that the thickness of the inner layer 210 is 1.5mm-2.0mm. The inner layer 210 refers to the structural layer in the explosion-proof resin material that is in direct contact with the airflow. Specifically, it is made of ultra-high molecular weight polyethylene (UHMWPE) material through a compression molding process. This material has self-lubricating properties and high impact resistance. The thickness parameter is determined through fluid dynamics simulation and wear tests, forming an effective wear-resistant barrier while ensuring the cross-sectional area of ​​the airflow channel. Specifically, the UHMWPE layer is subjected to continuous scouring by airflow particles during operation, and its thickness range is obtained by simulating the impact trajectory of dust particles of different sizes. When the thickness is less than 1.5mm, the material is prone to penetrating wear under high-speed particle impact; exceeding 2.0mm leads to a reduction in the cross-sectional area of ​​the airflow channel, resulting in increased pressure loss. This thickness range allows a dynamically renewing lubricating film to form on the material surface, which can both absorb particle kinetic energy and maintain airflow efficiency.

[0051] Compared to existing technologies, the inner layer 210 of traditional explosion-proof fans generally uses homogeneous resin with a fixed thickness, failing to consider the correlation between airflow medium and material wear. An excessively thin inner layer 210 wears rapidly in dusty airflow, generating microcracks, while an excessively thick inner layer 210 increases airflow resistance, leading to increased energy consumption. This solution establishes a balance between material strength and aerodynamic performance by limiting a specific thickness range. Through this technical solution, this application solves the problem of performance degradation of the explosion-proof resin inner layer 210 due to wear during long-term operation, extending the maintenance cycle of key components while maintaining airflow delivery efficiency.

[0052] This application further proposes that the blades of the wind turbine 150 are equipped with a tungsten-containing wear-resistant coating. The tungsten-containing wear-resistant coating refers to a protective layer of tungsten alloy or tungsten carbide particles formed on the surface of a metal substrate. Specifically, it can be achieved by using a thermal spraying process to melt tungsten-based powder and deposit it onto the blade surface, forming a dense and high-hardness surface structure. This coating enhances the wear resistance of the blade surface, preventing the generation of metal particles due to friction during operation. Specifically, during the high-speed rotation of the wind turbine 150, the tungsten-containing wear-resistant coating covers the windward side and edge areas of the blade, and its microhardness can reach more than twice that of a traditional chromium plating layer. The coating forms a metallurgical bond with the blade substrate, maintaining its intact surface morphology even under airflow scouring and particle collision conditions. By reducing the wear rate of the blade surface, it effectively suppresses metal debris shedding and eliminates the risk of sparks caused by collisions between metal particles and the casing 100.

[0053] Compared to existing technologies, traditional explosion-proof fan blades are mostly made of ordinary stainless steel or coated, which are prone to abrasive wear in dusty or corrosive environments, leading to coating peeling and the formation of sharp metal particles. The tungsten-containing wear-resistant coating, however, has a fracture toughness approximately 40% higher than conventional hard alloys, and its self-lubricating properties reduce the coefficient of friction when the blade comes into contact with foreign objects. Through this technical solution, this application addresses the problem of secondary explosions caused by metal particles generated from blade wear during long-term operation of fans. The ultra-high wear resistance of the tungsten-containing coating allows the blades to maintain surface integrity even in media containing solid particles, preventing metal debris from entering the airflow and causing electrostatic discharge or mechanical sparks. This is particularly suitable for working environments with combustible dust, such as coal mine gas drainage and aluminum powder conveying.

[0054] like Figure 6As shown, this application further proposes that the blade edges of the wind turbine 150 are inlaid with zircon ceramic wear-resistant strips 230. The zircon ceramic wear-resistant strip 230 refers to a strip-shaped structure made of zirconium oxide-based ceramic material, specifically prepared using a hot-pressing sintering process. Its Mohs hardness reaches 8.5 or higher, and its melting point exceeds 2500℃, preventing the generation of metal sparks when in contact with foreign objects during high-speed rotation. The blade edge inlay refers to fixing the wear-resistant strip to the blade tip using a mechanical snap-fit ​​and high-temperature adhesive composite process. Specifically, a dovetail groove combined with high-temperature resistant epoxy adhesive can be used to ensure that the wear-resistant strip does not shift under centrifugal force. Specifically, during the high-speed operation of the wind turbine 150, when the blade edge comes into contact with particles in the airflow or the inner wall of the equipment, the zircon ceramic wear-resistant strip 230, with its ultra-high hardness and high-temperature resistance, can eliminate the risk of sparks generated by metal material collisions. The inlay structure, through the synergistic fixation of the dovetail groove and adhesive, maintains interface stability while withstanding radial shear force, preventing the wear-resistant strip from detaching and causing secondary accidents. This structure is particularly suitable for flammable and explosive environments containing dust and debris, forming a physical isolation layer when the blades come into accidental contact with foreign objects.

[0055] Compared to existing technologies, traditional wind turbine blades mostly use metal edging or ordinary ceramic protection. Metal edging is prone to generating high-temperature sparks due to friction, while ordinary ceramics suffer from high brittleness and poor impact resistance. Zircon ceramic wear-resistant strip 230, while maintaining non-metallic properties, has a fracture toughness approximately 1.8 times higher than conventional alumina ceramics, allowing it to withstand higher-intensity mechanical impacts. Through the above technical solution, this application effectively solves the problem of ignition sources generated by foreign object collisions at the blade edges, extending blade lifespan while maintaining aerodynamic efficiency, and avoiding safety hazards caused by protective layer detachment.

[0056] This application further proposes that the motor 140 is equipped with a temperature sensor and a vibration sensor (not shown in the figure). The temperature sensor is a detection device used to monitor the operating temperature of the motor 140 in real time, specifically a thermocouple or thermistor, which determines whether the motor 140 is overheating by detecting temperature changes. The vibration sensor is a detection system used to collect mechanical vibration signals from the motor 140, specifically a piezoelectric sensor or accelerometer, which identifies abnormal operating conditions such as bearing wear or rotor imbalance through vibration spectrum analysis. Specifically, during the operation of the motor 140, the temperature sensor is placed in key parts such as the stator winding or bearing housing to continuously collect temperature data and transmit it to the control system. When the temperature exceeds a preset threshold, the system triggers an alarm signal and executes speed reduction or shutdown protection. The vibration sensor collects vibration signals in real time through a sensor installed on the motor 140 housing, extracts characteristic frequencies using a fast Fourier transform algorithm, and automatically generates a fault warning when abnormal amplitude or frequency components are detected. Synchronous monitoring of temperature and vibration data can effectively identify complex fault modes such as motor overload, lubrication failure, or mechanical loosening.

[0057] Compared to existing technologies, traditional explosion-proof motors 140 are only equipped with a single temperature protection device, which cannot identify potential risks caused by mechanical vibration. Furthermore, temperature detection points are typically limited to the winding ends, making it difficult to comprehensively reflect the internal thermal distribution of the motor 140. This solution integrates temperature and vibration dual-parameter monitoring, enabling simultaneous diagnosis of electrical and mechanical faults, thus solving the problems of delayed response and incomplete coverage in traditional monitoring methods. Through this technical solution, this application can identify abnormal temperature rises and mechanical vibrations in the motor 140 in advance, preventing localized overheating or mechanical sparks caused by faults such as bearing jamming, insulation aging, or rotor eccentricity, thereby effectively blocking the risk of explosion due to motor 140 failure.

[0058] This application further proposes a stator winding of motor 140 impregnated with arc-resistant enameled wire. The arc-resistant enameled wire refers to a conductor coated with a high-temperature resistant insulating material, specifically a polyamide-imide composite coating, which maintains its insulation performance even under high-temperature arc conditions. Impregnation refers to immersing the entire winding in insulating varnish, specifically using a vacuum pressure impregnation process, allowing the insulating varnish to fully fill the gaps between the conductors to form a continuous protective layer. Specifically, the stator winding undergoes conductor pretreatment before assembly, using arc-resistant enameled wire to form a coil structure. After winding, the entire winding is placed in an impregnation tank, and internal air is removed by vacuum negative pressure, followed by pressurization to allow the insulating varnish to penetrate into the gaps between the conductors. After curing, the insulating varnish forms a dense protective layer on the winding surface, which, together with the original coating of the enameled wire, constitutes a double insulation barrier. This structure effectively isolates the winding conductors from the external environment, preventing electric sparks caused by voltage breakdown or partial discharge.

[0059] Compared to existing technologies, traditional explosion-proof motors (140) often use ordinary enameled wire with a single impregnation process, which is prone to insulation layer carbonization and peeling under high temperature or overload conditions. This solution, however, utilizes the synergistic effect of an arc-resistant coating and the impregnation process to maintain the insulation integrity of the windings under arc impact, while the impregnation layer compensates for protective gaps caused by localized damage to the enameled wire. Through this technical solution, this application solves the problem of explosion risk caused by internal insulation failure in motor (140), reduces the probability of sparks generated in the stator windings under abnormal discharge or overload conditions, and improves the operational safety of motor (140) in flammable environments.

[0060] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. An explosion-proof fan, characterized in that, include: The housing (100) is provided with an air inlet (110) and an air outlet (120), and the air inlet (110) is provided with a flame arrester (130). The rotating device includes a motor (140) and a wind turbine (150). The motor (140) is connected to the wind turbine (150) via an anti-static belt (160). The motor (140) is an explosion-proof motor. The wind turbine (150) has a rotating electrostatic brush (170) embedded in its shaft and conducts static charge through a grounding copper wire (180) provided through the housing (100). Both the wind turbine (150) and the housing (100) are made of explosion-proof resin. The explosion-proof resin has a three-layer composite structure including: Outer layer (190): Carbon nanotube PEEK composite material; Intermediate layer (200): Aluminum hydroxide flame retardant layer; Inner layer (210): Ultra-high molecular weight polyethylene.

2. The explosion-proof fan according to claim 1, characterized in that, The flame arrester (130) is equipped with a metal mesh filter element (220).

3. The explosion-proof fan according to claim 1, characterized in that, The outer layer (190) has a thickness of 0.8 mm to 1.2 mm.

4. The explosion-proof fan according to claim 1, characterized in that, The thickness of the intermediate layer (200) is 2.0mm-3.5mm.

5. An explosion-proof fan according to claim 1, characterized in that, The thickness of the inner layer (210) is 1.5mm-2.0mm.

6. The explosion-proof fan according to claim 1, characterized in that, The blades of the wind turbine (150) are provided with a tungsten-containing wear-resistant coating.

7. An explosion-proof fan according to claim 1, characterized in that, The blade edges of the wind turbine (150) are inlaid with zircon ceramic wear-resistant strips (230).

8. The explosion-proof fan according to claim 1, characterized in that, The motor (140) is equipped with a temperature sensor and a vibration sensor.

9. An explosion-proof fan according to claim 1, characterized in that, The stator windings of the motor (140) are impregnated with arc-resistant enameled wire.

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