Air filter for generator

Abstract

The invention belongs to the technical field of air filtration, and particularly relates to an air filter for an electric generator, which comprises the following components: a filter shell, a filter assembly and a self-cleaning system.The air filter has the beneficial effects that erosion of particulate matters in air to internal components of the electric generator is reduced, the operation efficiency of equipment is improved, and the service life of the equipment is prolonged; the generator adapts to extreme environments and meets the use requirements of the generator in various scenes; by optimizing airflow and a self-cleaning technology, energy consumption and maintenance cost are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of air filtration, and in particular to an air filter for a generator. Background Art

[0002] The main function of the generator air filter is to filter dust, sand and other impurities in the air entering the engine, thereby preventing these particles from entering the engine and causing wear.

[0003] In the related art, traditional air filters need to be cleaned and replaced regularly to maintain filtering efficiency. For example, dry filters need to be cleaned every 150 hours of operation, while wet filters need to have their oil replaced and filter elements cleaned regularly. These operations are not only time-consuming and labor-intensive, but also particularly unfriendly to harsh working conditions (such as construction sites or mining areas). For this reason, we propose an air filter for generators.

[0004] The above information disclosed in this Background section is only for understanding the background of the present inventive concept and therefore it may contain information that does not constitute prior art. Summary of the invention

[0005] In order to overcome the shortcomings of the prior art, the present invention provides an air filter for a generator to solve the problem that the conventional air filter mentioned in the above background technology needs to be cleaned and the filter element replaced regularly to maintain the filtering efficiency. For example, the dry filter element needs to be cleaned every 150 hours of operation, while the wet filter element needs to be regularly replaced with oil and cleaned. These operations are not only time-consuming and labor-intensive, but also particularly unfriendly to relatively harsh working conditions (such as construction sites or mining areas).

[0006] The technical solution adopted by the present invention to solve the technical problem is: an air filter for a generator, comprising the following components:

[0007] Filter housing: The filter housing is made of high-strength engineering plastics or aluminum alloy that is resistant to high temperatures and corrosion, ensuring that the filter has a long service life in harsh environments. The filter housing is cylindrical or rectangular in design, with a filter assembly installation slot inside, and is equipped with waterproof and dustproof sealing rings to ensure airtightness. The filter housing provides mechanical protection for the entire device and prevents external particles from directly entering the filter area;

[0008] Filter assembly: The filter assembly includes a multi-layer composite filter element and a supporting structure, which is used to filter particulate matter in the air. The multi-layer composite filter element includes an outer layer, a middle layer and an inner layer, wherein:

[0009] Outer layer: coarse filter layer, made of metal mesh or pre-filter foam, used to capture large particles;

[0010] Middle layer: High-efficiency melt-blown material, made of polypropylene fiber, captures medium-sized dust and impurities;

[0011] Inner layer: nanofiber membrane for filtering fine particles, including PM2.5;

[0012] The support structure uses a rigid plastic frame or a metal support mesh to fix the multi-layer composite filter element to prevent the filter element from deforming under air flow pressure;

[0013] Self-cleaning system: The self-cleaning system includes a reverse pulse airflow device and a control module. The reverse pulse airflow device includes a compressed air nozzle and an air storage tank, which are installed above or on the side of the filter; the control module has a built-in differential pressure sensor to detect the pressure difference on both sides of the filter. When the pressure difference reaches a preset value, the control module activates the nozzle to release high-pressure air to remove dust from the surface of the filter element.

[0014] As an optimized technical solution, the middle layer preparation process of the multi-layer composite filter element is as follows:

[0015] S1: Polymer selection: Polypropylene is used because it has a high melt index, is easy to process, and can form fine fibers, the diameter of which is usually between 2-7 microns;

[0016] S2: Melt extrusion: Polypropylene is melted at high temperature, the temperature is 250℃, and extruded from the small holes of the die through an extruder;

[0017] S3: Hot air flow stretching: High-temperature, high-speed hot air flow stretches the molten polymer into fine fibers. The fiber diameter can be adjusted according to the temperature, speed and die design of the air flow;

[0018] S4: Fiber collection: The microfibers are cooled by air flow and randomly deposited on a collection surface, using a roller or conveyor belt, to form a meltblown nonwoven fabric;

[0019] S5: Charge Treatment: To enhance filtration performance, an electrostatic charge is added to the fiber surface, which helps to attract smaller particles.

[0020] As an optimized technical solution, the process of step S2 is as follows:

[0021] A 1. Polymer melting and extrusion:

[0022] Material heating: Polypropylene granules are heated to a molten state in the extruder, with a temperature range of 200-250°C;

[0023] Die extrusion: The molten polymer is extruded through the small holes of the meltblowing die to form an initial melt stream. The die hole diameter is 0.2-0.4 mm;

[0024] A 2. Thermal Stretch:

[0025] Hot air flow generation: The air is heated to 250-350℃ through the air flow heating device, using one of the electric heaters or burners;

[0026] High-speed airflow formation: The heated air is ejected through the nozzle at a high speed of 100-200 m / s and intersects with the polymer melt;

[0027] Fiber drawing: High-speed airflow exerts shear force on the melt, stretching it into microfibers with a diameter range of 1-5 microns;

[0028] A3. Cooling and solidification:

[0029] Cooling air system: After leaving the die, the fiber passes through the cooling air zone to solidify and form;

[0030] Collecting fibers: The solidified microfibers are adsorbed onto a drum or mesh belt to form a nonwoven fabric.

[0031] As an optimized technical solution, the devices and processes required for charge processing in step S5 are as follows:

[0032] The charge introduction device comprises:

[0033] High-voltage electrostatic generator: provides a high-voltage electric field to apply electric charge on the surface of the material;

[0034] The electrode plate is made of a conductive material and is used to apply a uniform electric field on the surface of the material. The conductive material is one of aluminum or copper.

[0035] Transport system: includes material conveyor belts or rollers, which are used to move the filter material through the electric field area; the high-voltage electrostatic generator is connected to the electrode plate, which provides the required electric field strength through precise control, and the filter material passes through the electric field continuously through the conveyor to ensure uniform charging.

[0036] The process of electrostatic charge injection is as follows:

[0037] Pretreatment: Filter materials such as polypropylene melt-blown materials must be kept clean and dry to prevent impurities from affecting charge distribution;

[0038] Charge injection: The filter material is exposed to a high voltage electric field (usually 50-100 kV) for a certain period of time, with a voltage range of 50-100 kV and an exposure time of 4-60 seconds;

[0039] Charge stabilization: Prolonging the charge retention time by cooling or adding a charge enhancer to the material, the charge enhancer being either magnesium silicate or titanium dioxide.

[0040] As an optimized technical solution, the structural composition and connection method of the reverse pulse airflow device are as follows:

[0041] Device structure:

[0042] Compressed air storage tank: responsible for storing and stabilizing the compressed air pressure, designed as a steel gas tank with an exhaust valve to remove moisture and impurities;

[0043] Pulse nozzle and pulse valve: installed in the blowpipe system above the filter, the pulse nozzles are evenly distributed above the filter surface, the nozzles are connected to the pulse valve, and the pulse valve is responsible for quickly releasing compressed air according to the control signal;

[0044] Differential pressure sensor: installed on both sides of the filter element to monitor the pressure difference on both sides of the filter element in real time;

[0045] Control module: built-in microprocessor, receives sensor data and activates pulse cleaning operation according to algorithm logic;

[0046] Connection method:

[0047] Gas circuit connection: The gas storage tank is connected to the pulse valve through a high-pressure resistant pipeline. A pressure stabilizing device is set in the pipeline to ensure the stability of the air flow. The outlet of the pulse valve is connected to the nozzle blowpipe to ensure that the compressed air can be evenly distributed;

[0048] Circuit connection: The control module is connected to the differential pressure sensor, pulse valve and power supply system, and controls the opening time and sequence of the pulse valve through digital signals.

[0049] As an optimized technical solution, the self-cleaning working steps are as follows:

[0050] When the filter element is dusted and the pressure difference reaches the preset value, which is 200-300 Pa, the control module receives the signal from the differential pressure sensor and starts the dust cleaning process;

[0051] The compressed air is quickly released through the pulse valve, forming a short-term strong airflow, which impacts the surface of the filter element and removes the dust from the filter element;

[0052] The fallen dust is cleaned by the dust collecting device or dust discharge system at the bottom of the filter.

[0053] As an optimized technical solution, the following components are also included:

[0054] Air inlet: An air inlet is set at one end of the housing, with a dustproof grille and airflow guide device to evenly distribute the air to the surface of the filter element;

[0055] Air outlet: The air outlet at the other end is connected to the air inlet pipe of the generator, and the firmness and airtightness are ensured by a snap-on or threaded interface;

[0056] O-ring: Installed at the connection between the filter element and the housing to prevent unfiltered air from leaking from the connection;

[0057] Quick-release fasteners: Use fast-release fasteners between the housing and the generator interface to facilitate filter element replacement and cleaning;

[0058] Sensor: Install a differential pressure sensor between the air inlet and outlet to monitor the working status of the filter assembly in real time;

[0059] Alarm device: The sensor is connected to the generator control panel via a data cable. When it detects that the pressure difference is too high, it triggers an alarm to prompt the user to clean or replace the filter element.

[0060] As an optimized technical solution, the connection between the components is as follows:

[0061] The housing and filter assembly are installed in a snap-on manner with a built-in slide rail for easy replacement of the filter element; the air inlet and outlet are fixed to the generator interface through flange connections or threaded interfaces, and are equipped with rubber gaskets to enhance the seal; the high-pressure nozzle is directly aimed at the surface of the filter element and connected to the compressed air tank through a hose; the sensor and the control panel are connected with a high-temperature resistant cable, and the wiring is fixed in the groove of the filter housing.

[0062] The beneficial effects of the present invention are:

[0063] Reduce the erosion of particulate matter in the air on the internal components of the generator, improve the operating efficiency and life of the equipment; adapt to extreme environments and meet the use requirements of the generator in various scenarios; reduce energy consumption and maintenance costs by optimizing airflow and self-cleaning technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] Figure 1 The present invention provides a system connection block diagram of an air filter for a generator. DETAILED DESCRIPTION

[0065] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form a new embodiment.

[0066] It should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0067] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0068] Embodiment 1:

[0069] An air filter for a generator in this embodiment includes the following components:

[0070] Filter housing: The filter housing is made of high-strength engineering plastics or aluminum alloy that is resistant to high temperatures and corrosion, ensuring that the filter has a long service life in harsh environments. The filter housing is cylindrical or rectangular in design, with a filter assembly installation slot inside, and is equipped with waterproof and dustproof sealing rings to ensure airtightness. The filter housing provides mechanical protection for the entire device and prevents external particles from directly entering the filter area;

[0071] Filter assembly: The filter assembly includes a multi-layer composite filter element and a supporting structure, which is used to filter particulate matter in the air. The multi-layer composite filter element includes an outer layer, a middle layer and an inner layer, wherein:

[0072] Outer layer: coarse filter layer, made of metal mesh or pre-filter foam, used to capture large particles;

[0073] Middle layer: High-efficiency melt-blown material, made of polypropylene fiber, captures medium-sized dust and impurities;

[0074] Inner layer: nanofiber membrane for filtering fine particles, including PM2.5;

[0075] The supporting structure uses a rigid plastic frame or a metal supporting mesh to fix the multi-layer composite filter element to prevent the filter element from deforming under air flow pressure;

[0076] Self-cleaning system: The self-cleaning system includes a reverse pulse airflow device and a control module. The reverse pulse airflow device includes a compressed air nozzle and an air storage tank, which are installed above or on the side of the filter; the control module has a built-in differential pressure sensor to detect the pressure difference on both sides of the filter. When the pressure difference reaches a preset value, the control module activates the nozzle to release high-pressure air to remove dust from the surface of the filter element.

[0077] As an optimized technical solution, the middle layer preparation process of the multi-layer composite filter element is as follows:

[0078] S1: Polymer selection: Polypropylene is used because it has a high melt index, is easy to process, and can form fine fibers, the diameter of which is usually between 2-7 microns;

[0079] S2: Melt extrusion: Polypropylene is melted at high temperature, the temperature is 250℃, and extruded from the small holes of the die through an extruder;

[0080] S3: Hot air flow stretching: High-temperature, high-speed hot air flow stretches the molten polymer into fine fibers. The fiber diameter can be adjusted according to the temperature, speed and die design of the air flow;

[0081] S4: Fiber collection: The microfibers are cooled by air flow and randomly deposited on a collection surface, using a roller or conveyor belt, to form a meltblown nonwoven fabric;

[0082] S5: Charge Treatment: To enhance filtration performance, an electrostatic charge is added to the fiber surface, which helps to attract smaller particles.

[0083] As an optimized technical solution, the process of step S2 is as follows:

[0084] A 1. Polymer melting and extrusion:

[0085] Material heating: Polypropylene granules are heated to a molten state in the extruder, with a temperature range of 200-250°C;

[0086] Die extrusion: The molten polymer is extruded through the small holes of the meltblowing die to form an initial melt stream. The die hole diameter is 0.2-0.4 mm;

[0087] A 2. Thermal Stretch:

[0088] Hot air flow generation: The air is heated to 250-350℃ through the air flow heating device, using one of the electric heaters or burners;

[0089] High-speed airflow formation: The heated air is ejected through the nozzle at a high speed of 100-200 m / s and intersects with the polymer melt;

[0090] Fiber drawing: High-speed airflow exerts shear force on the melt, stretching it into microfibers with a diameter range of 1-5 microns;

[0091] A3. Cooling and solidification:

[0092] Cooling air system: After leaving the die, the fiber passes through the cooling air zone to solidify and form;

[0093] Collecting fibers: The solidified microfibers are adsorbed onto a drum or mesh belt to form a nonwoven fabric;

[0094] 1. Air flow temperature:

[0095] Typical range: 200°C to 300°C, depending on the type of polymer used and the fiber diameter target;

[0096] Influencing factors: Higher air flow temperature helps to further reduce the fiber diameter, but may increase the risk of fiber breakage;

[0097] Application: For example, when processing polypropylene, hot air flow temperatures of 230°C to 260°C are usually used;

[0098] 2. Thermal air velocity:

[0099] Typical range: Mach 0.5 to 2;

[0100] Function: The higher the hot air flow velocity, the more significant the stretching effect on the molten polymer, and the finer fibers can be produced. The selection of velocity also needs to consider the turbulence of the air to avoid fiber breakage or irregular deposition;

[0101] 3. Die head design:

[0102] Spinneret hole diameter: 0.2 to 0.4 mm, small hole diameter helps to produce finer fibers;

[0103] Die hole density: 20 to 40 spinneret holes per 10 cm width to ensure uniform fiber distribution;

[0104] Air gap: The distance between the die spinneret and the airflow outlet is 1-3 mm, which affects the degree of interaction between the airflow and the polymer flow;

[0105] Jet angle: The angle of the airflow to the spinneret is 30° to 60° to optimize fiber drawing and deposition;

[0106] Tensile force model:

[0107]

[0108] Where η is the viscosity of the polymer, v 气流 is the air velocity, v 熔体 is the melt extrusion speed;

[0109] Fiber Diameter Model:

[0110]

[0111] Among them, Q 熔体 is the melt flow rate, and L is the fiber length.

[0112] As an optimized technical solution, the devices and processes required for charge processing in step S5 are as follows:

[0113] The charge introduction device comprises:

[0114] High-voltage electrostatic generator: provides a high-voltage electric field to apply electric charge on the surface of the material;

[0115] The electrode plate is made of a conductive material and is used to apply a uniform electric field on the surface of the material. The conductive material is one of aluminum or copper.

[0116] Transport system: includes material conveyor belts or rollers, which are used to move the filter material through the electric field area; the high-voltage electrostatic generator is connected to the electrode plate, which provides the required electric field strength through precise control, and the filter material passes through the electric field continuously through the conveyor to ensure uniform charging.

[0117] The process of electrostatic charge injection is as follows:

[0118] Pretreatment: Filter materials such as polypropylene melt-blown materials must be kept clean and dry to prevent impurities from affecting charge distribution;

[0119] Charge injection: The filter material is exposed to a high voltage electric field (usually 50-100 kV) for a certain period of time, with a voltage range of 50-100 kV and an exposure time of 4-60 seconds;

[0120] Charge stabilization: Prolonging the charge retention time by cooling or adding a charge enhancer to the material, the charge enhancer is either magnesium silicate or titanium dioxide;

[0121] Charge distribution equation: The distribution of static charge on the surface of a material can be expressed by Gauss's law:

[0122] σ=∈0·E;

[0123] Where σ is the charge density on the surface of the material, ∈0 is the dielectric constant of air, and E is the applied electric field strength;

[0124] Capture efficiency model: Filter media efficiency is usually expressed as the particle capture probability:

[0125]

[0126] Among them, η is the efficiency, d is the fiber diameter, L is the filter material thickness, Q is the air flow rate, C is the particle concentration, and V is the potential on the fiber surface.

[0127] In this embodiment, the structure and connection method of the reverse pulse airflow device are as follows:

[0128] Device structure:

[0129] Compressed air storage tank: responsible for storing and stabilizing the compressed air pressure, designed as a steel gas tank with an exhaust valve to remove moisture and impurities;

[0130] Pulse nozzle and pulse valve: installed in the blowpipe system above the filter, the pulse nozzles are evenly distributed above the filter surface, the nozzles are connected to the pulse valve, and the pulse valve is responsible for quickly releasing compressed air according to the control signal;

[0131] Differential pressure sensor: installed on both sides of the filter element to monitor the pressure difference on both sides of the filter element in real time;

[0132] Control module: built-in microprocessor, receives sensor data and activates pulse cleaning operation according to algorithm logic;

[0133] Connection method:

[0134] Gas circuit connection: The gas storage tank is connected to the pulse valve through a high-pressure resistant pipeline. A pressure stabilizing device is set in the pipeline to ensure the stability of the air flow. The outlet of the pulse valve is connected to the nozzle blowpipe to ensure that the compressed air can be evenly distributed;

[0135] Circuit connection: The control module is connected to the differential pressure sensor, pulse valve and power supply system, and controls the opening time and sequence of the pulse valve through digital signals.

[0136] Embodiment 2:

[0137] In this embodiment, the self-cleaning process is as follows:

[0138] When the filter element is dusted and the pressure difference reaches the preset value, which is 200-300 Pa, the control module receives the signal from the differential pressure sensor and starts the dust cleaning process;

[0139] The compressed air is quickly released through the pulse valve, forming a short-term strong airflow, which impacts the surface of the filter element and removes the dust from the filter element;

[0140] The fallen dust is cleaned by the dust collecting device or dust discharge system at the bottom of the filter;

[0141] Logical flow:

[0142] Differential pressure sensor data collection: sampling pressure difference on both sides of the filter element;

[0143] Data analysis and judgment: Use dynamic threshold method or fixed threshold method to judge whether the pressure difference exceeds the standard;

[0144] Triggering of the cleaning process: When the pressure difference exceeds the standard, the nozzle cleaning is started according to the preset pulse sequence;

[0145] Subsequent pressure difference monitoring: If the pressure difference does not return to the normal range, repeat the cleaning action.

[0146] Specifically, the following components are also included:

[0147] Air inlet: An air inlet is set at one end of the housing, with a dustproof grille and airflow guide device to evenly distribute the air to the surface of the filter element;

[0148] Air outlet: The air outlet at the other end is connected to the air inlet pipe of the generator, and the firmness and airtightness are ensured by a snap-on or threaded interface;

[0149] O-ring: Installed at the connection between the filter element and the housing to prevent unfiltered air from leaking from the connection;

[0150] Quick-release fasteners: Use fast-release fasteners between the housing and the generator interface to facilitate filter element replacement and cleaning;

[0151] Sensor: Install a differential pressure sensor between the air inlet and outlet to monitor the working status of the filter assembly in real time;

[0152] Alarm device: The sensor is connected to the generator control panel via a data cable. When the pressure difference is detected to be too high, an alarm is triggered to prompt the user to clean or replace the filter element;

[0153] The connections between the components are as follows:

[0154] The housing and filter assembly are installed in a snap-on manner with a built-in slide rail for easy replacement of the filter element; the air inlet and outlet are fixed to the generator interface through flange connections or threaded interfaces, and are equipped with rubber gaskets to enhance the seal; the high-pressure nozzle is directly aimed at the surface of the filter element and connected to the compressed air tank through a hose; the sensor and the control panel are connected with a high-temperature resistant cable, and the wiring is fixed in the groove of the filter housing.

[0155] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot limit the scope of protection of the present invention in turn. Various combinations, modifications or equivalent substitutions of the technical solutions of the present invention by technicians in this field do not depart from the spirit and scope of the technical solutions of the present invention, and should be included in the scope of the claims of the present invention.

Claims

1. An air filter for a generator, characterized in that: Includes the following components: Filter housing: The filter housing is made of high-strength engineering plastics or aluminum alloy that is resistant to high temperatures and corrosion, ensuring that the filter has a long service life in harsh environments. The filter housing is cylindrical or rectangular in design, with a filter assembly installation slot inside, and is equipped with waterproof and dustproof sealing rings to ensure airtightness. The filter housing provides mechanical protection for the entire device and prevents external particles from directly entering the filter area; Filter assembly: The filter assembly includes a multi-layer composite filter element and a supporting structure, which is used to filter particulate matter in the air. The multi-layer composite filter element includes an outer layer, a middle layer and an inner layer, wherein: Outer layer: coarse filter layer, made of metal mesh or pre-filter foam, used to capture large particles; Middle layer: High-efficiency melt-blown material, made of polypropylene fiber, captures medium-sized dust and impurities; Inner layer: nanofiber membrane for filtering fine particles, including PM2.5; The support structure uses a rigid plastic frame or a metal support mesh to fix the multi-layer composite filter element to prevent the filter element from deforming under air flow pressure; Self-cleaning system: The self-cleaning system includes a reverse pulse airflow device and a control module. The reverse pulse airflow device includes a compressed air nozzle and an air storage tank, which are installed above or on the side of the filter; the control module has a built-in differential pressure sensor to detect the pressure difference on both sides of the filter. When the pressure difference reaches a preset value, the control module activates the nozzle to release high-pressure air to remove dust from the surface of the filter element.

2. The air filter for a generator according to claim 1, characterized in that: The middle layer preparation process of the multi-layer composite filter element is as follows: S1: Polymer selection: Polypropylene is used because it has a high melt index, is easy to process, and can form fine fibers, the diameter of which is usually between 2-7 microns; S2: Melt extrusion: Polypropylene is melted at high temperature, the temperature is 250℃, and extruded from the small holes of the die through an extruder; S3: Hot air flow stretching: High-temperature, high-speed hot air flow stretches the molten polymer into fine fibers. The fiber diameter can be adjusted according to the temperature, speed and die design of the air flow; S4: Fiber collection: The microfibers are cooled by air flow and randomly deposited on a collection surface, using a roller or conveyor belt, to form a meltblown nonwoven fabric; S5: Charge Treatment: To enhance filtration performance, an electrostatic charge is added to the fiber surface, which helps to attract smaller particles.

3. The air filter for a generator according to claim 2, characterized in that: The process of step S2 is as follows: A 1. Polymer melting and extrusion: Material heating: Polypropylene granules are heated to a molten state in the extruder, with a temperature range of 200-250°C; Die extrusion: The molten polymer is extruded through the small holes of the meltblowing die to form an initial melt stream. The die hole diameter is 0.2-0.4 mm; A 2. Thermal Stretch: Hot air flow generation: The air is heated to 250-350℃ through the air flow heating device, using one of the electric heaters or burners; High-speed airflow formation: The heated air is ejected through the nozzle at a high speed of 100-200 m / s and intersects with the polymer melt; Fiber drawing: High-speed airflow exerts shear force on the melt, stretching it into microfibers with a diameter range of 1-5 microns; A3. Cooling and solidification: Cooling air system: After leaving the die, the fiber passes through the cooling air zone to solidify and form; Collecting fibers: The solidified microfibers are adsorbed onto a drum or mesh belt to form a nonwoven fabric.

4. The air filter for a generator according to claim 2, characterized in that: The devices and processes required for charge processing in step S5 are as follows: The charge introduction device comprises: High-voltage electrostatic generator: provides a high-voltage electric field to apply electric charge on the surface of the material; The electrode plate is made of a conductive material and is used to apply a uniform electric field on the surface of the material. The conductive material is one of aluminum or copper. Transport system: includes material conveyor belts or rollers, which are used to move the filter material through the electric field area; the high-voltage electrostatic generator is connected to the electrode plate, which provides the required electric field strength through precise control, and the filter material passes through the electric field continuously through the conveyor to ensure uniform charging. The process of electrostatic charge injection is as follows: Pretreatment: Filter materials such as polypropylene melt-blown materials must be kept clean and dry to prevent impurities from affecting charge distribution; Charge injection: The filter material is exposed to a high voltage electric field (usually 50-100 kV) for a certain period of time, with a voltage range of 50-100 kV and an exposure time of 4-60 seconds; Charge stabilization: Prolonging the charge retention time by cooling or adding a charge enhancer to the material, the charge enhancer being either magnesium silicate or titanium dioxide.

5. The air filter for a generator according to claim 1, characterized in that: The structural composition and connection mode of the reverse pulse airflow device are as follows: Device structure: Compressed air storage tank: responsible for storing and stabilizing the compressed air pressure, designed as a steel gas tank with an exhaust valve to remove moisture and impurities; Pulse nozzle and pulse valve: installed in the blowpipe system above the filter, the pulse nozzles are evenly distributed above the filter surface, the nozzles are connected to the pulse valve, and the pulse valve is responsible for quickly releasing compressed air according to the control signal; Differential pressure sensor: installed on both sides of the filter element to monitor the pressure difference on both sides of the filter element in real time; Control module: built-in microprocessor, receives sensor data and activates pulse cleaning operation according to algorithm logic; Connection method: Gas circuit connection: The gas storage tank is connected to the pulse valve through a high-pressure resistant pipeline. A pressure stabilizing device is set in the pipeline to ensure the stability of the air flow. The outlet of the pulse valve is connected to the nozzle blowpipe to ensure that the compressed air can be evenly distributed; Circuit connection: The control module is connected to the differential pressure sensor, pulse valve and power supply system, and controls the opening time and sequence of the pulse valve through digital signals.

6. The air filter for a generator according to claim 1, characterized in that: The self-cleaning process is as follows: When the filter element is dusted and the pressure difference reaches the preset value, which is 200-300 Pa, the control module receives the signal from the differential pressure sensor and starts the dust cleaning process; The compressed air is quickly released through the pulse valve, forming a short-term strong airflow, which impacts the surface of the filter element and removes the dust from the filter element; The fallen dust is cleaned by the dust collecting device or dust discharge system at the bottom of the filter.

7. The air filter for a generator according to claim 1, characterized in that: Also includes the following components: Air inlet: An air inlet is set at one end of the housing, with a dustproof grille and airflow guide device to evenly distribute the air to the surface of the filter element; Air outlet: The air outlet at the other end is connected to the air inlet pipe of the generator, and the firmness and airtightness are ensured by a snap-on or threaded interface; O-ring: Installed at the connection between the filter element and the housing to prevent unfiltered air from leaking from the connection; Quick-release fasteners: Use fast-release fasteners between the housing and the generator interface to facilitate filter element replacement and cleaning; Sensor: Install a differential pressure sensor between the air inlet and outlet to monitor the working status of the filter assembly in real time; Alarm device: The sensor is connected to the generator control panel via a data cable. When it detects that the pressure difference is too high, it triggers an alarm to prompt the user to clean or replace the filter element.

8. The air filter for a generator according to claim 1, characterized in that: The connections between the components are as follows: The housing and filter assembly are installed in a snap-on manner with a built-in slide rail for easy replacement of the filter element; the air inlet and outlet are fixed to the generator interface through flange connections or threaded interfaces, and are equipped with rubber gaskets to enhance the seal; the high-pressure nozzle is directly aimed at the surface of the filter element and connected to the compressed air tank through a hose; the sensor and the control panel are connected with a high-temperature resistant cable, and the wiring is fixed in the groove of the filter housing.

Images