983 results about "Composite filter" patented technology

The invention relates to the technical field of high-temperature flue gas filtration, and particularly discloses a composite filter material flame-retardant filter cartridge and a manufacturing process thereof. The manufacturing process comprises the following steps: performing opening, mixing, carding, lapping, grid connection and pre-needling on polyester fibers and glass fibers to obtain a pre-needled felt; performing spunlace reinforcement treatment on the pre-needled felt to obtain a filter material plain felt; singeing the filter material plain felt, dipping the filter material plain felt in the dipping emulsion, mangling and drying to obtain a stiff filter material; pleating the stiff filter material, welding the stiff filter material into a barrel-shaped structure, welding a sealing opening of a fixing bandage, and mounting metal end covers at the two ends of the barrel-shaped structure to obtain the composite filter material flame-retardant filter barrel; the impregnating emulsion comprises the following raw materials in percentage by weight: 30-40% of a flame retardant, 30-40% of a stiffening agent and 30-40% of water. By adopting the steps of fiber compounding, dipping, mangling, drying and the like, the high temperature resistance and flame retardance of the filter material can be improved while the strength of the filter material is kept.

The utility model discloses an in-situ groundwater heavy metal pollution remediation device. Comprising two permeable reactive barriers arranged at intervals in the groundwater pollution plume runoff direction. A filling cavity is formed between the two permeable reactive barriers, and filling materials are arranged in the filling cavity. According to the utility model, a double-unit permeable reactive barrier is adopted to carry out an in-situ remediation method, the first unit is filled with a zeolite and volcanic rock composite filter material to adsorb and capture heavy metal pollutants, and the second unit is filled with an active charcoal composite filler to further efficiently adsorb residual heavy metals. In addition, a plant planting zone is constructed for planting heavy metal hyperaccumulation herbaceous plants, pollutants such as heavy metal in underground water are thoroughly removed through the absorption and stabilization effect of plants, and the underground water is purified. The device adopts stable, economic, efficient and safe active filler to adsorb and remove heavy metals in underground water, and has the advantages of efficient restoration, strong applicability, ecological environmental protection and the like.

The invention discloses a cyclone separation and moving particle bed coupled pulverized coal pyrolysis oil gas high-temperature dust removal system, and belongs to the technical field of coal clean utilization. The system comprises a cyclone separator, a fine filtration unit, a filter material cyclic regeneration unit and an intelligent control unit, the fine filtration unit comprises a particle bed, a particle bin is arranged at the top end of the particle bed, and a composite filter material layer is arranged on the particle bed; a dust-containing high-temperature oil gas pipeline and a pretreatment high-temperature oil gas pipeline are arranged at the top end of the cyclone separator, dust-containing high-temperature oil gas is introduced into the cyclone separator through the dust-containing high-temperature oil gas pipeline to be pretreated, and the pretreated dust-containing high-temperature oil gas is introduced into the particle bed through the pretreatment high-temperature oil gas pipeline to be finely filtered; and a coke breeze discharge pipe is arranged at the bottom of the cyclone separator. The invention is used for solving the technical problem of low gas-solid separation efficiency at high temperature caused by the adoption of a single filter material in the existing pulverized coal dust removal system.

The utility model relates to the technical field of water purification, and provides a water purification assembly and water purification equipment, the water purification assembly comprises a shell and a filter element, the filter element comprises a front filter element, a capacitive deionization filter element and a rear filter element, and a positive pole lug and a negative pole lug of the capacitive deionization filter element are arranged in a containing space; the first water outlet of the rear filter element is formed in the water outlet space, and the design is based on the water outlet space and the accommodating space which are isolated from each other, so that water and electricity isolation of the water purification assembly is realized, and the reliability of water purification work of the water purification assembly is ensured. Moreover, the front filter element, the capacitive deionization filter element and the rear filter element are integrated into a whole to form the composite filter element, and the composite filter element occupies a small space, so that the waterway structure of the existing water purification assembly is simplified.

A filter media comprises a first fiber layer and a second fiber layer positioned downstream of the first fiber layer. The first fiber layer has a first geometric mean fiber diameter of less than 1 μm such that the geometric standard deviation of fiber diameter is greater than 2. The second fiber layer has a second geometric mean fiber diameter of less than 1 μm such that the geometric standard deviation of fiber diameter is less than 2.

The invention discloses a composite filter cartridge centrifugal forming device and a forming process. A forming box is filled with water; injecting the fiber mixed solution into an inner mold with sieve pores in a forming box, wherein the rotating speed of the inner mold with sieve pores is gradually increased from low to high in the process; the fiber mixed liquid is mixed and distributed in the water of the inner mold with the sieve pores by centrifugal force, and water in the fiber mixed liquid is discharged through the sieve pores of the inner mold with the sieve pores under the action of the centrifugal force to form a composite filter cartridge; the forming mechanism is simple in system, does not need a vacuum negative pressure forming system, and achieves uniform distribution under the action of water flow in the forming box body by utilizing the characteristics that fibers are small, light, not easy to settle and uniform in distribution. The surfaces of the inner layer and the outer layer of the composite filter cartridge subjected to high-speed centrifugal molding have no pits, are neat and not rough, and do not need secondary polishing; and by adopting a material-shaft-free design, extrusion deformation of the reinforcing net caused by mechanical extrusion of a material shaft is avoided, so that reinforcing framework nets in different forms can be added in the mold, and integrated interweaving centrifugal forming with fibers is facilitated.

The utility model discloses an energy-saving type dust micro-power grading purification and recovery device which is formed by combining a dust particle settling box (4), a filtering dust removal purification box (5), a dust discharge port (7), a dust hopper (8), an electric dust discharge valve (9) and supporting legs (10). A dust-containing airflow inlet (1) is formed in the upper part of the dust particle settling box (4), and an air supply outlet (2) is formed in the outer side of the lower part of the dust particle settling box (4); a purified gas outlet (3) is formed in the top of the dust particle settling box (4), and a composite filtering assembly (6) is arranged on the upper portion in the dust particle settling box (4). According to the utility model, the combined action of multiple acting force fields such as gravity, inertia force, collision action, Brown diffusion, coagulation action and retention action is utilized to realize micro-power sedimentation, filtration, dust removal and graded purification of dust of the mine crushing system, and the dust removal device has the advantages of high dust removal efficiency, low energy consumption, low operating cost, simple structure and convenience in installation; the dust removal efficiency is greatly improved, the comprehensive dust control and removal effect is remarkable, and the energy-saving effect is remarkable.

An acoustic wave device includes a silicon single crystal baseplate including a main surface, a piezoelectric layer directly or indirectly on the main surface of the silicon single crystal baseplate, and an IDT electrode on the piezoelectric layer and including electrode fingers. The piezoelectric layer is a lithium niobate layer. In the main surface of the silicon single crystal baseplate, a plane orientation is (111). When Euler angles in the main surface of the silicon single crystal baseplate are (φ, θ, ψ), the ψ in the Euler angles of the silicon single crystal baseplate is about −30 degrees <ψ< about 30 degrees.

The invention discloses a preparation method and application of a PTFE composite filter material with a denitration function, and belongs to the technical field of filter materials. A high-temperature-resistant PTFE polymer needled filter material is used as a base material, and polydopamine and MXene are adopted to carry out functional modification on the fiber surface of the filter material, so that the dispersion degree and the synergistic effect of a catalyst on the fiber surface are improved; the preparation method comprises the following steps: uniformly loading a manganese-cerium denitration catalyst precursor on the surface of a filter material fiber by virtue of an equivalent-volume impregnation method, then calcining to obtain an active component of the denitration catalyst, and finally impregnating in hydrogen peroxide to further activate the composite filter material, so that the low-temperature denitration activity of the composite filter material is improved. The PTFE composite filter material prepared by the invention has good denitration capability at low temperature, retains the original dust filtering effect in the preparation process, can meet the requirement of low-temperature denitration and dust removal integration in industrial tail gas, and effectively overcomes the defects of complexity, high treatment cost and the like of a tail flue gas purification system in the prior art.

The invention relates to a virtual inertia-damping cooperative adaptive control method for a voltage source type direct-driven permanent magnet wind turbine generator. The method comprises the following steps: constructing a voltage source type direct-driven permanent magnet wind turbine grid-connected equivalent model; constructing a wind turbine generator frequency response model based on a dynamic coupling relationship between virtual inertia and virtual damping; collecting a frequency signal of a common connection point of a power grid, and carrying out collaborative optimization processing on the frequency signal by adopting a composite filter to obtain a virtual power increment; the active power reference value is introduced into an active power control loop of the grid-side converter; and controlling the power grid side converter after the additional power reference value is introduced by adopting a rotational inertia and damping coefficient adaptive control method based on a nonlinear function. According to the method, frequency steady-state deviation compensation and dynamic change rate correction can be realized, the frequency stability under wide-range disturbance can be improved through segmented nonlinear adjustment, and the requirements of unit active inertia response and power grid frequency stability are met.

The utility model belongs to the technical field of water purifiers, particularly relates to an integrated water purifier with a composite filter element, and aims to solve the problems that the existing water purifier with the composite filter element is complicated in structure and tedious in installation, the filter element is inconvenient to replace, the maintenance cost is high and the like. The water purifier main body is composed of a first filtering part, a second filtering part and a third filtering part, the first filtering part, the second filtering part and the third filtering part are fixedly connected in sequence, a filter element is arranged in the first filtering part, the filter element is made of PP cotton, and activated carbon is arranged in the second filtering part. According to the integrated composite filter element water purifier, impurities, bacteria and viruses in water are effectively removed through a multiple filtering technology, the water quality is ensured to be pure, the detachable movable cover design enables the filter element to be replaced easily and rapidly, the maintenance cost is reduced, the installation process is simplified through the combined design of the installation support, and meanwhile the stability of the water purifier is ensured.

The utility model discloses an efficient HEPA potassium permanganate composite filter material preparation particle self-suction type feeding device, which comprises a feeding bin, a negative pressure mechanism and a feeding mechanism, the top of the feeding bin is provided with a main feeding port, the main feeding port is provided with a main feeding pipeline, the main feeding pipeline is provided with an upper layer electric valve and a lower layer electric valve, and the upper layer electric valve and the lower layer electric valve are connected with the negative pressure mechanism. A Y-shaped feeding pipe is mounted at the top of the main feeding pipeline, the Y-shaped feeding pipe is provided with two input pipelines and an output pipeline, the output pipeline is connected with the top of the main feeding pipeline, a negative pressure port is formed in the top of each input pipeline, a filter screen is mounted at the position, close to the negative pressure port, in each input pipeline, and branch feeding ports are formed in the positions, below the filter screens, of the input pipelines; the utility model further comprises. According to the automatic feeding device, automatic feeding and supplementing of particle materials can be achieved, manual time-consuming and labor-consuming feeding and frequent feeding are not needed, the input pipeline is switched to be communicated with the negative pressure source in the feeding process, the filter screen is prevented from being blocked, and the feeding efficiency of the particle materials is improved.

The invention belongs to the technical field of steel plate welding mechanisms, and discloses a steel plate production welding mechanism with a waste gas cleaning structure, which comprises a mounting frame, a filtering device and a dust collecting device, the dust collecting device is hermetically communicated with the filtering device through a first hose, the dust collecting device comprises an upper integrated cavity and a lower integrated cavity, and the filtering device comprises a filtering box body; a filter cartridge is detachably mounted on the filter box body, a dust collector is arranged on the filter cartridge, and the filter cartridge is sequentially provided with a pre-cooling unit module, a back-blowing composite filter element and an activated carbon adsorption layer from bottom to top. According to the steel plate production welding mechanism with the waste gas cleaning structure, source collection of welding waste gas is achieved through the split type dust collecting device, the upper integrated cavity and the lower integrated cavity cooperate to form a multi-stage filtering system, the waste gas collecting efficiency is improved, the overall structure is compact and adapts to different welding angle working conditions, particles are preliminarily filtered through an annular filter screen, and the welding quality is improved. And meanwhile, the device is convenient to disassemble and clean, and the particles are stored.

The utility model relates to the technical field of environment-friendly pyrolyzing furnaces, and discloses a pyrolyzing recovery device with a waste gas treatment function, which comprises a pyrolyzing furnace, a water tank is fixedly mounted on the outer wall of the pyrolyzing furnace, a gas pipe is fixedly mounted at the top of the pyrolyzing furnace, and the gas pipe is fixedly mounted on the outer wall of the pyrolyzing furnace. According to the pyrolysis recovery device with the waste gas treatment function, waste gas can be secondarily filtered through cooperation of a thick-core filter screen, an activated carbon plate and a composite filter screen in a bent pipe and water in a water tank, and when the activated carbon plate needs to be replaced, a threaded rod is rotated through a handle to drive the bent pipe to move downwards to be separated from a gas pipe; meanwhile, the thick-core filter screen, the activated carbon plate and the composite filter screen can be sequentially moved out of the bent pipe one by one in cooperation with supporting of the ejector rod and the cross, the thick-core filter screen, the activated carbon plate and the composite filter screen can be replaced at the moment, the activated carbon plate can be kept in the optimal filtering state to filter waste gas, the waste gas filtering effect can be improved, and use is very convenient.

The utility model discloses a composite filter element and water purification equipment, and relates to the technical field of water purification equipment, the composite filter element comprises a filter bottle, a first filter assembly and a second filter assembly, the bottom of the filter bottle is provided with a mounting port; the filter bottle cap is mounted at the bottle opening; the partition cylinder is arranged in the filter bottle, the partition cylinder divides the interior of the filter bottle into a first filter cavity and a second filter cavity, the first filter assembly comprises a front filter element and / or a rear filter element, and the second filter assembly comprises a reverse osmosis filter element. According to the technical scheme, the mounting opening is formed in the bottom of the filter bottle, so that the first filter assembly with the front filter element and / or the rear filter element is detachably mounted in the mounting opening, and only the first filter assembly needs to be directly dismounted when the first filter assembly is replaced; therefore, the step of detaching the whole composite filter element from the water purification device is omitted, and the replacement step of the first filter assembly is simplified.

The invention relates to the technical field of water conservancy projects, and discloses a two-way water stop cast iron gate with a protection function, comprising: a door-shaped gate frame, which is internally provided with a vertical lifting area; the nodular cast iron gate is movably mounted in the vertical lifting area; the bidirectional self-adaptive sealing system comprises an adjusting cavity which is arranged in the nodular cast iron gate and is through up and down; the connecting rod is fixed to the top of the door-shaped gate frame and extends into the adjusting cavity. The piston assembly can move in the adjusting cavity; when the gate descends, water flow penetrates through the filtering structure to enter the adjusting cavity, the self-weight of the gate is increased, the sealing effect is assisted, the gate can still be kept in a closed state especially under the low-water-pressure or water-free working condition, when the gate ascends, water in the adjusting cavity reversely scours the composite filtering plate, impurities are taken away, and self-cleaning of the filtering system and the bottom sealing strip is achieved; the manual maintenance frequency is reduced, and the device has the advantages of being high in practicability and self-cleaning.

The invention provides an impurity removal device for a clear-pond tea saponin concentrated solution, which comprises a device support column and a device shell fixedly mounted at the top of the device support column, a liquid inlet column is arranged in the device shell, a liquid inlet is formed in the upper end of the liquid inlet column, a liquid storage box is fixedly mounted on the inner side of the device support column, and a liquid outlet is formed in the lower end of the liquid storage box. A liquid filtering device is fixedly installed at the center of the top of the liquid storage box, the bottom of the liquid inlet column is located at the center of the liquid filtering device, a filter screen disc is arranged in the liquid filtering device, and a transverse liquid distributing pipe and a longitudinal liquid distributing pipe are arranged at the top of the filter screen disc. Through the synergistic effect of the designed liquid inlet column, the filtrate device, the filter screen disc and the filter agent caulking groove, uniform permeation of the tea saponin concentrated solution in the filter agent is realized, and biological polysaccharide is effectively adsorbed and filtered by the composite filter agent, so that the proportion of pentacyclic triterpenoid saponin in the concentrated solution is remarkably increased. The desugared concentrated solution is light in color, so that higher efficiency is shown when wild trash fishes are removed in shrimp and crab culture.

The invention discloses a paper composite filter material for reducing hydrocyanic acid and crotonaldehyde and a preparation method and application thereof, and the preparation method comprises the following steps: adding a gelator into a solvent to form a gelator solution; transferring the gelator solution into a liquid storage tank of an intaglio printing device, and printing and coating the gelator solution in the liquid storage tank onto a paper base material by using an anilox roller; the coated paper base material is conveyed to a low-temperature tunnel, so that nanofibers of a three-dimensional network structure are formed inside and on the surface of the paper base material in a self-assembly mode; and transferring the paper base material subjected to low-temperature treatment to a drying cylinder, and drying to obtain the paper composite filter material. According to the prepared paper composite filter material, the specific surface area in contact with smoke can be increased, the paper composite filter material can make full contact with the smoke in the process that the smoke passes through a filter stick, the interception capacity of the paper filter stick on hydrocyanic acid and crotonaldehyde in mainstream smoke of cigarettes is improved through amino and carboxyl groups on the surfaces of the nanofibers, and the sensory quality of the cigarettes with the paper filter stick is improved.

The utility model relates to the technical field of edge covering devices for composite filter cotton processing, in particular to an edge covering device for composite filter cotton processing, which comprises a bottom plate, an edge covering seat is arranged on the front side of the base surface of the bottom plate, and fixing components are symmetrically arranged on the base surface of the bottom plate and located on the left side and the right side of the edge covering seat. A fixing assembly is arranged on the edge covering device for composite filter cotton processing, when edge covering is carried out on composite filter cotton, after one side of the composite filter cotton is folded, the two ends of the composite filter cotton are placed between a first fixing plate and a second fixing plate correspondingly, then an electric telescopic rod is operated, and then the composite filter cotton is fixed to the first fixing plate and the second fixing plate. An electric telescopic rod drives an adjusting block to move, and a first fixing plate and a second fixing plate are driven to move under the cooperation of a first adjusting seat and a second adjusting seat, so that the two ends of the composite filter cotton can be fixed through the first fixing plate and the second fixing plate, and the composite filter cotton does not need to be manually supported by a worker during edge covering; and the edge covering is more convenient.

The utility model discloses a composite filter element and equipment with a water purification function, and the composite filter element comprises a filter bottle, a filter bottle cover, a filter element cover and a filter element handle, the filter bottle cap is mounted on the filter bottle, a mounting groove is formed in the middle of the filter bottle cap, a mounting opening is formed in the bottom of the mounting groove, a limiting table is arranged on the periphery of the mounting opening, and an insertion hole is formed in the limiting table; the filter element cover is detachably mounted at the mounting opening; a bolt is arranged on one side, facing the filter element cover, of the filter element handle and penetrates through the insertion hole; the filter bottle cover is further provided with a limiting structure, the limiting structure is provided with a reinforcing table connected with the limiting structure, the limiting structure forms a limiting groove, the filter element handle is arranged in the limiting groove in a sliding mode, and the limiting groove limits the filter element handle in the axial direction of the filter bottle. According to the technical scheme, the reinforcing table is arranged on the limiting structure and used for reinforcing the limiting structure, the limiting structure is prevented from being damaged by washing, and the filter element cover is connected in a pressing mode through the plug pin, so that the overall structure of the composite filter element is good in reliability.

The invention discloses a tough underwater superoleophobic gel composite coating and a preparation method thereof.The preparation method specifically comprises the following steps that 1, a base material is soaked in a mixed solution of tannic acid and 3-aminopropyltriethoxysilane, after a period of time, the base material is taken out and soaked in a ferric chloride solution, and a nano-particle modified filter screen is obtained after drying; (2) loading the gel precursor solution on a nanoparticle modified filter screen through a dip-coating method, and preparing a gel composite filter screen under ultraviolet initiation; and (3) soaking the gel composite filter screen in a sodium citrate aqueous solution, and taking out the gel composite filter screen to obtain the tough underwater super-oleophobic gel composite coating modified fishing net. According to the method, the tough underwater super-oleophobic gel composite coating modified fishing net is prepared by adopting an impregnation method and ultraviolet initiation, the preparation process is simple, and the prepared gel composite coating has excellent oil stain resistance, mechanical stability and chemical stability and can be applied to crude oil adhesion prevention and oil-water separation of industrial oily wastewater.

The invention belongs to the technical field of air purification equipment, and particularly relates to a movable air quality monitoring and purifying device which comprises an intelligent control assembly, a control panel, a movable shell, an air detection sensor assembly, a suction fan and a composite filter element. The composite filter element of the movable air quality monitoring and purifying equipment has a damp-proof function, the situation that the composite filter element is too moist to breed a large number of microorganisms, and consequently air purification fails is avoided, the use safety and reliability of the composite filter element can be improved, the use cycle of the composite filter element can be prolonged, and the service life of the composite filter element is prolonged. In addition, the movable air quality monitoring and purifying equipment further has the functions of automatic sterilization and indoor drying and automatic humidification, the living comfort of the purified indoor air environment is improved, the air purifying effect of the purifying equipment is improved, the body health of indoor personnel can be guaranteed, and the movable air quality monitoring and purifying equipment is suitable for popularization and application. And the use safety of the air purification equipment is further improved.

The invention discloses a circulating water purification treatment process for heat exchange equipment, and relates to the technical field of circulating water purification treatment, and the circulating water purification treatment process comprises the following steps: preparing a polyaspartic acid-silane functionalized grafting intermediate; selecting a porous zeolite matrix, and performing acid activation treatment; the preparation method comprises the following steps: preparing a zeolite matrix, soaking the zeolite matrix in sol, standing, defoaming, heating and calcining to obtain a nano TiO2 coated zeolite matrix of which the surface is coated with nano titanium dioxide; immersing the nano TiO2 coated zeolite matrix into the solution, adjusting the pH value of the solution, and stirring for reaction to obtain a PASP functionalized zeolite filter material; and immersing the PASP functionalized zeolite filter material into a silver nitrate solution, carrying out photocatalytic reduction, and carrying out in-situ reduction and deposition on silver ions to obtain the silver / titanium dioxide-polyaspartic acid synergistic functionalized composite filter material. The composite filter material with synergistic functions realizes efficient scale inhibition and sterilization and rapid purification, shows excellent stability and durability under severe working conditions of high temperature, long period and the like, and is environment-friendly and low in maintenance cost.

The utility model relates to a cold water, hot water and ice making integrated direct drinking machine which comprises a shell, and a water supply device, a heating device, a cold water device and an ice making device are arranged in the shell in a close fit mode. The water supply device comprises a raw water tank, a self-priming pump, a composite filter element, a combined electromagnetic valve and a pure water tank; the heating device comprises a first water suction pump, a heating body and a water outlet; the refrigeration water device comprises a second water suction pump, a compressor, a drying filter, a condenser, a cold water tank, an ice block heat preservation box, a third water suction pump and a fourth water suction pump, the output end of the third water suction pump is connected with an ice block water tank, an evaporator is arranged in the ice block water tank, the output end of the fourth water suction pump is connected with the water outlet, and a cold water notch is formed in one side of the ice block water tank; the ice block heat preservation box is communicated with the cold water tank; the ice making device comprises a motor and a deicing electromagnetic valve, an ice block box is arranged in the ice block heat preservation box, the water refrigerating and ice making efficiency and quality can be effectively improved, the structure is reasonable, the size is smaller, and the cost is low.

The invention belongs to the field of filter bags, and particularly relates to a filter bag with a multilayer composite filter structure, a support mechanism comprises filter cloth racks arranged up and down, and inner filter cloth clamping plates and outer filter cloth clamping plates are respectively clamped on the inner and outer layers of the filter cloth racks; inner filter cloth is clamped between the filter cloth frames, a plurality of pieces of bent middle filter cloth are formed on the outer layer of the inner filter cloth, and the inner filter cloth, the middle filter cloth and the outer filter cloth are combined into a three-layer filter structure; the middle filter cloth combination is arranged between the inner filter cloth and the outer filter cloth to form a composite filter structure, so that the effective filter area can be increased and the filter performance of the filter bag is improved; the circular track mechanism, the purging mechanism and the vibrating mechanism are arranged, the problem that the interior of the composite filter structure is inconvenient to clean during movement is solved, the purging mechanism and the vibrating mechanism are dynamically covered, dust impurities accumulated on filter cloth are cleaned in an active and passive mode, and the situation that the filter effect of a filter bag is reduced due to local filter cloth blockage is avoided.

The invention relates to a range extender torsional vibration suppression method and system based on high-order filter active damping, and the method comprises the following steps: comparing the target rotating speed of a motor with the actual rotating speed, and obtaining a motor rotating speed error; the motor rotating speed error is converted into rotating speed output torque through a rotating speed controller; extracting a motor rotating speed fluctuation component through a high-order composite filter according to the actual rotating speed of the motor; obtaining compensation torque according to the motor rotating speed fluctuation component in combination with the proportional gain coefficient; superposing the compensation torque into the rotating speed output torque, and performing negative feedback control on the rotating speed of the motor to obtain a final motor torque instruction; and the rotating speed of the motor is controlled according to the final motor torque instruction, and torsional vibration of the range extender is restrained. Compared with the prior art, the torsional vibration of the range extender can be effectively inhibited, the rotating speed fluctuation is reduced, and the NVH performance and the operation stability of the range extender are improved.

The utility model discloses a composite filter element and water purification equipment, and relates to the technical field of water purification, the composite filter element comprises a filter bottle, a filter bottle cover, a separation cylinder, a reverse osmosis filter assembly and a replaceable filter element assembly; the separation cylinder is arranged in the filter bottle and forms a first filter cavity and a second filter cavity which are isolated from each other, the reverse osmosis filter assembly is arranged in the first filter cavity, and the replaceable filter element assembly is detachably arranged in the second filter cavity; the replaceable filter element assembly comprises a shell and a filter element assembly arranged in the shell, a rear water inlet is formed in the shell, a reverse osmosis water outlet communicated with the second filter cavity is further formed in the bottom of the separation barrel, and the reverse osmosis water outlet is communicated with the rear water inlet in an inserted mode. According to the composite filter element disclosed by the utility model, the technical problem that impurities and solid particles filtered by the filter element can remain on the cavity wall after the replaceable filter element assembly is detached from the filter cavity of the composite filter element can be solved.

The utility model discloses a composite filtering water treatment system for wet spunlace, which comprises an air flotation reaction system, a middle water tank, a sand filtering tank filtering system, a micro-nano filtering system and a clean water barrel for production, the air flotation reaction system, the middle water tank, the sand filter tank filtering system, the micro-nano filtering system and the clean water barrel for production are sequentially connected through pipelines; the air flotation reaction system is connected with a production water recovery pipeline, and the middle water tank is connected with a raw water pipeline. According to the composite filtered water treatment system for wet spunlace, the wastewater treatment efficiency is improved, zero discharge of wastewater is achieved, the environmental influence is reduced, water resources are saved, and the production cost is reduced. And meanwhile, the quality of non-woven fabric products is improved.

A countertop water dispensing system includes a base; a raw water tank detachably arranged on the base and including a water outlet and a water inlet; a water purification tank detachably arranged on the base and including a water outlet and a water inlet; a filter system provided between the raw water tank and the water purification tank and formed by connecting a reverse osmosis (RO) membrane composite filter element and an activated carbon fiber filter element in series, a water inlet, a first-stage purification water outlet, and a waste water outlet of the RO membrane composite filter element being communicated respectively with the water outlet of the raw water tank, a water inlet of the activated carbon fiber filter element, and the raw water tank; and a pump provided on a pipeline communicating the water inlet and the water outlet of the raw water tank.

The utility model discloses a cavity filler composite filter rod forming device in the technical field of filter rod forming, which comprises a charge rod conveying belt, a charge rod arranging assembly, a smoke gun and a particle adding assembly, the charge rod arranging assembly is arranged between the charge rod conveying belt and the smoke gun, and the particle adding assembly is arranged above the smoke gun; the charge bar arrangement assembly comprises a feeding adapter disc, an anti-backlash adapter disc and a positioning adapter disc, the anti-backlash adapter disc is located between the feeding adapter disc and the positioning adapter disc, and the rotation direction of the anti-backlash adapter disc is opposite to the rotation direction of the feeding adapter disc and the rotation direction of the positioning adapter disc; the particle adding assembly comprises a material bin, a material conveying pipe and a funnel, the funnel is located over the forming paper, the material bin is installed above the funnel, and the material conveying pipe is connected between the material bin and the funnel. The utility model not only realizes the production of the cavity filler composite filter stick, but also has the advantages of simple structure, strong operability and convenience in large-scale application.