19results about How to "Reduce flooding" patented technology

The invention discloses an induction type intelligent charging pile, and belongs to the field of charging piles, the induction type intelligent charging pile comprises a charging pile body and a cable fixedly connected to the back of the charging pile body, the back of the charging pile body is provided with a floating part, the floating part comprises a sliding block fixedly connected to the back of the charging pile body, and the back of the charging pile body is in sliding contact with a support. According to the invention, the charging pile body is always in a water level moisture state through the buoyancy of the arranged first air bag, so that the charging pile body is prevented from being soaked by accumulated water; as the height of the charging pile body can be increased along with the rise of the external water level, the situation that the charging pile body is soaked by rainwater due to rainwater accumulation at a lower terrain is effectively avoided, then the phenomenon that the interior of the charging pile is soaked by water is reduced, and normal use of the charging pile body is guaranteed.

The invention belongs to the technical field of fuel cells, and particularly relates to a mesoscale simulation method of a fuel cell diffusion layer, which comprises the following steps of: constructing a computational domain of a diffusion layer structure; calculating the electrochemical reaction rate under the target working condition in the computational domain; determining a discrete velocity distribution function of each grid point in the computational domain; calculating saturation, macroscopic pressure and macroscopic speed of water and oxygen; a mass transfer process control equation of each grid point in the computational domain is determined, and the oxygen concentration is calculated; determining a fluid-structure interaction heat transfer process control equation of each grid point in the computational domain and calculating a macroscopic temperature; and judging whether the water saturation and the macroscopic velocity meet threshold values or not. Compared with the prior art, the method solves the problem that in the prior art, a simulation method for accurate coupling and mutual feedback between mesoscale multi-physics fields of a battery diffusion layer is difficult. According to the scheme, a mesoscale fine simulation method for multiphase flow mass transfer, dynamic electrochemical reaction and heat transfer in a flow layer, a diffusion layer and a catalyst layer of the fuel cell is constructed.

The application belongs to the technical field of proton exchange membrane fuel cell, and relates to a hydrophobicity-adjustable alloy nanotube array electrode for fuel cell and preparation and application thereof. Specifically, the application comprises preparation of metal nanotube array, alloying and hydrophobization of the metal nanotube array, and assembly of the membrane electrode. First, a metal nanotube array is constructed on a substrate surface through a two-step hydrothermal method; then, a hydrophobic substance is introduced into the metal nanotube array by means of immersion or ultrasonic spraying; then, pyrolysis is performed to realize alloying and hydrophobization of the nanotube array; finally, the nanotube array is transferred to a proton membrane, and the membrane electrode is cleaned. The membrane electrode can be applied to a proton exchange membrane fuel cell. The hydrophobicity-adjustable nanotube array electrode prepared by the application has the advantages of high catalyst activity and stability, low platinum loading, good water management, and easy scaling-up.

The invention belongs to the technical field of fuel cells, and particularly relates to a PEM fuel cell membrane electrode and a preparation method thereof. The preparation method of the PEM fuel cell membrane electrode provided by the invention comprises the following steps: preparing composite hydrophilic resin and composite hydrophobic resin, preparing cathode first catalyst layer slurry by adopting the composite hydrophilic resin, and controlling the spraying rate to obtain a cathode first catalyst layer of which the content of the composite hydrophilic resin is gradually changed; preparing cathode second catalyst layer slurry by adopting composite hydrophobic resin, controlling the spraying rate to obtain a cathode second catalyst layer with gradually changed composite hydrophobic resin content, and performing transfer printing and hot pressing on the cathode first catalyst layer, the cathode second catalyst layer, the anode catalyst layer and a proton membrane to obtain a membrane electrode, wherein the content of the composite hydrophilic resin in the first catalyst layer of the cathode is uniformly reduced from top to bottom along the gravity direction, and the content of the composite hydrophobic resin in the second catalyst layer of the cathode is uniformly increased from top to bottom along the gravity direction.

The present disclosure relates to a three-dimensional tunnel waterproofing and drainage system, the three-dimensional tunnel waterproofing and drainage system comprises a base plate, the base plate has a first surface and a second surface opposite to each other, the first surface faces the initial support of the tunnel, and the second surface faces the secondary lining of the tunnel; a plurality of water retaining structures extending in a direction away from the first surface are arranged on the first surface, the water retaining structures are integrally formed with the base plate, and the plurality of water retaining structures are sequentially arranged at intervals along the length direction of the base plate, each water retaining structure has a drainage channel extending along the width direction of the base plate, the side of the drainage channel facing the initial support of the tunnel is open, and the two ends of the drainage channel are open to form drainage ports; all drainage channels are arranged in parallel, so as to effectively guide the accumulated water on the first surface, so that the accumulated water can be discharged in time. At the same time, the second surface is a smooth and flat surface, which protects the structure of the drainage channel during the construction of the secondary lining of the tunnel and ensures the drainage effect of the waterproofing and drainage board.

This application discloses a method for inverting insect wingbeat frequency based on initial phase calculation, relating to the field of radar measurement technology. The method includes: establishing a radar echo model of insect wingbeat motion containing amplitude and phase initial phases; acquiring micro-motion signals from the collected insect echoes based on the model to generate a micro-Doppler spectrum; calculating the phase initial phase value of the insect wingbeat based on the micro-Doppler spectrum; constructing a phase compensation factor based on the phase initial phase value to obtain a wingbeat parameter plane; detecting energy peaks in the wingbeat parameter plane based on the phase compensation factor; and determining the insect's wingbeat frequency based on the position of the energy peaks. This application, by introducing phase and amplitude initial phases, recreates the dual physical processes of wing movement and body micro-motion during insect wingbeat, making the radar echo model highly consistent with the actual signal generation mechanism, reducing errors, and improving anti-interference capabilities.

The invention relates to a dual-module intercooler type fuel cell cathode inlet temperature and humidity cooperative control method. The method comprises the steps that fuel cell cathode air inlet real-time state parameters and operation parameters are obtained, a multivariable coupling prediction model is constructed after preprocessing, and a temperature and humidity reference and an oxygen stoichiometric ratio target reference are set in combination with heat exchange characteristics of a dual-module intercooler; then the core body heat exchange distribution proportion is regulated and controlled, humidification adjustment is matched, and the core body heat exchange distribution proportion and the humidification adjustment intensity are dynamically adjusted according to the real-time working condition; comparing the deviation between the adjusted actual temperature and humidity and the target temperature and humidity reference, and correcting the heat exchange distribution proportion and the humidifying adjustment parameter through a dynamic constraint correction model; cooperative regulation and control of cathode inlet temperature and humidity are realized, dynamic change of working conditions is adapted, and stable operation of the fuel cell is guaranteed.

The invention relates to a method for preparing a hierarchical porous catalyst layer of a high-drainage porous membrane electrode based on micro-nano bubbles, which comprises the following steps of: generating oxygen bubbles under the catalysis of carbon-loaded platinum by taking hydrogen peroxide as a bubble source, and constructing the high-drainage porous membrane electrode by taking the micro-nano bubbles as a template; the specific method comprises the following steps: dissolving a carbon-supported platinum catalyst PtC and a Nafion solution in ethanol and water to obtain a solution, carrying out ultrasonic treatment on the solution, dropwise coating the solution on carbon paper at 80 DEG C, and dropwise adding a hydrogen peroxide solution in the coating process; and drying in a vacuum freeze drying box after air drying. According to the invention, the membrane electrode with high porosity is constructed, so that liquid water is effectively prevented from blocking pores, and the phenomenon of water logging in the battery is relieved. According to the preparation method, shrinkage and agglomeration of catalyst particles are avoided, and the hierarchical porous catalyst layer of the porous membrane electrode with high drainage performance is obtained. The invention also provides application of the porous membrane electrode in the field of fuel cells.

The novel device comprises a plurality of groups of water intercepting bodies, each group of water intercepting bodies comprises a receiving groove and two drainage grooves, each drainage groove and each receiving groove are each a section of circular ring body, each section of circular ring body is of a hollow cavity structure, and the upper end, the front end and the rear end of each section of circular ring body are open; in each group of water intercepting bodies, the two drainage grooves are arranged at an interval, and are connected and communicated with each other through a receiving groove; a water outlet is formed in the bottom of the receiving groove; the multiple water intercepting bodies are used for being arranged in a shaft and attached to the well wall, and the multiple water intercepting bodies are sequentially and annularly connected and surround the well wall to form a circular ring body. The upper end of the cotton yarn is attached to the inner wall of an upper shaft, and the lower end of the cotton yarn extends to the drainage groove and the bearing groove and is used for draining seepage water of the shaft wall into the drainage groove and the bearing groove. By the adoption of the novel device and the construction drainage method, effective drainage of seepage water of the vertical shaft can be achieved, and the corrosion influence of well wall seepage water overflow on the structure and equipment facilities is reduced.

This invention discloses a pipe expansion joint reinforcement device and its construction method, comprising: two auxiliary pipe fitting assemblies, detachably fitted onto opposite ends of a pipe expansion joint; a support beam assembly, disposed on one side of the pipe expansion joint, the support beam assembly being arranged along the length direction of the pipe expansion joint, the support beam assembly including a first beam segment, a second beam segment, and an elastic element, the first beam segment forming an axially arranged socket channel, one end of the second beam segment slidingly disposed in the socket channel, and the elastic element connecting the first beam segment and the second beam segment; and a quick-connect assembly, the other ends of the first beam segment and the second beam segment respectively connected to the two auxiliary pipe fitting assemblies. This invention solves the problem that the pressure-bearing capacity of existing HDPE pipe expansion joints is relatively weak and prone to disengagement.

The utility model relates to the technical field of passive fuel cells, in particular to a passive fuel cell cathode plate. Comprising a pole plate main body, and a plurality of uniformly distributed through holes are formed in the middle of the pole plate main body; the polar plate main body is provided with a front surface and a rear surface, a flow field rib part on the front surface of the cathode polar plate is provided with a rhombic hydrophilic pattern, the center of the rhombic hydrophilic pattern is provided with a drain hole, and the surface, except the rhombic hydrophilic pattern, of the front surface of the cathode polar plate is provided with a hydrophobic part, so that the hydrophobic part and the rhombic hydrophilic pattern are alternately arranged on the front surface of the cathode polar plate. Therefore, a hydrophilic-hydrophobic coupling surface is formed. When a large amount of liquid water is accumulated on one side, facing a flow field, of the cathode gas diffusion layer of the fuel cell, the liquid water is captured by the rhombic hydrophilic pattern due to the coupling effect of the hydrophilic and hydrophobic parts, and then the liquid water is promoted to be discharged, the mass transfer efficiency is enhanced and the water logging is relieved under the effect of Laplace pressure difference existing in the rhombic hydrophilic pattern; and the performance of the passive fuel cell is further improved.

The invention relates to a catalyst layer with a gradient pore structure and a preparation method and application thereof, and the preparation method comprises the following steps: by taking polyvinyl alcohol as a pore forming agent, forming a first catalyst layer on a proton exchange membrane by using a first catalyst slurry layer; taking polyvinyl alcohol and calcium carbonate particles as pore-forming agents, and forming a second catalyst layer on the first catalyst layer by using the second catalyst slurry layer; and by taking calcium carbonate particles as a pore forming agent, forming a third catalyst layer on the second catalyst layer by utilizing the third catalyst slurry layer. Compared with the prior art, by virtue of the gradient pore structure design, effective diffusion of oxygen from the gas diffusion layer into the catalyst layer is realized, the oxygen mass transfer resistance is reduced, meanwhile, the occurrence of a water logging phenomenon in the catalyst layer is slowed down, and the electrochemical performance of the fuel cell is remarkably improved.

The present application relates to a lotus leaf-like biomimetic bipolar plate, a self-draining method thereof and a fuel cell, the lotus leaf-like biomimetic bipolar plate comprising a bipolar plate body, a flow channel ridge, a flow channel, a branch flow channel, a confluence flow channel, a gas inlet and a gas outlet; the flow channel is provided with uniformly distributed micro flow fields; the micro flow field comprises uniformly distributed lotus leaf-like papilla structures. The lotus leaf-like biomimetic bipolar plate is provided with micro flow fields in the flow field and lotus leaf-like papilla structures in the micro flow field, so that the water generated by the reaction cannot be infiltrated in the flow field, but is separated by the lotus leaf-like papilla structures into the form of water droplets and slid out of the bipolar plate, the draining efficiency is improved, and the phenomenon of water flooding of the fuel cell is reduced.

The utility model discloses a novel fuel cell test fixture, which relates to the technical field of cell test fixtures and specifically comprises an anode collector plate and a cathode collector plate, gas pipeline connectors are respectively arranged on two sides of the anode collector plate and the cathode collector plate, and one gas pipeline connector is an inlet; the anode flow field plate and the cathode flow field plate are located between the anode collector plate and the cathode collector plate, the anode flow field plate is located on the side face of the anode collector plate, the cathode flow field plate is located on the side face of the cathode collector plate, and the surface of the anode flow field plate and the surface of the cathode flow field plate are each provided with two first air ports. In the application process, the heating sheets are arranged among the end plates, the insulating plates and the collector plates and are tightly attached to the cathode and anode collector plates, so that rapid temperature rise is achieved; meanwhile, the phenomena of air shortage and water logging of the membrane electrode are effectively reduced.

The invention belongs to the field of road engineering, discloses a method for designing a permeable pavement of a road in a booster station, solves the problem that a permeable pavement design scheme in the prior art is not accurate enough, and provides an accurate and scientific reference basis for the design of the road in the booster station. According to the method, corresponding test standard test pieces are formed by selecting different aggregate grading schemes and determining different cement dosages in the cement dosage percentage range, the water seepage performance and the structural strength performance of the test pieces are tested, and the correlation of performance indexes is obtained through correlation analysis; adjusting the mix proportion of the test pieces according to a correlation analysis result, screening out the test pieces with the water seepage performance and the structural strength performance meeting the requirements, and judging whether the whole pavement adopting the test pieces meets the water seepage requirement or not through seepage simulation of a finite element road model. The method is suitable for the design of the permeable pavement in the booster station.

The utility model discloses a drainage structure for municipal construction engineering, and relates to the technical field of municipal engineering. The drainage device comprises a drainage assembly, a limiting assembly and an adjusting assembly, the drainage assembly comprises a drainage shell, connecting shells are fixedly installed on the two sides of the drainage shell, a filter plate is detachably installed on the top of an inner cavity of the drainage shell, limiting plates are fixedly installed on the two sides of the filter plate, and a fixing plate is fixedly installed at the bottom of the inner cavity of the drainage shell. The clamping blocks and the limiting plates are used in cooperation, the filter plate can be rapidly and stably installed, a welding mode is not needed, installation can be rapidly completed, the filter plate can be rapidly disassembled when the filter plate needs to be cleaned or maintained, workers can use the filter plate conveniently, and after long-time use, the filter plate can be rapidly disassembled, and the filter plate can be rapidly and stably installed. A large amount of dirt can be accumulated on the filter plate, the filtering effect of the filter plate is influenced, the filter plate can be conveniently cleaned by disassembling the filter plate, and the filtering effect of the filter plate in use is ensured.

The invention discloses a fuel cell bipolar plate with a composite directional drainage and ice suppression microstructure. The fuel cell bipolar plate comprises a reaction surface and a cooling surface, the reaction surface is provided with a gas inlet, a gas reaction area, two gas transition areas and a gas outlet; the gas inlet is communicated with one gas transition area, and the gas outlet is communicated with the other gas transition area; a plurality of runner ribs are arranged on the gas reaction area at intervals, and gas runners are formed between the adjacent runner ribs; the two ends of the gas flow channel are respectively communicated with the two gas transition areas; a plurality of spindle ribs and a plurality of super-hydrophobic ice-inhibiting micro-synapses are fixed on the surface of the gas flow channel; the cooling surface is provided with a liquid inlet, a cooling area, two cooling liquid shunting areas and a liquid outlet; the liquid inlet is communicated with one cooling liquid distribution area, and the liquid outlet is communicated with the other cooling liquid distribution area; and two ends of the cooling area are respectively communicated with the cooling liquid shunting area.

This application relates to the field of proton exchange membrane fuel cell technology, and provides a gas diffusion layer, its preparation method, and its application. The gas diffusion layer includes a substrate layer and a microporous layer disposed on one side of the substrate layer. The substrate layer has stacked carbon fibers with voids between them. The microporous layer permeates into the substrate layer, forming overlapping portions, and partially permeates into the voids formed by the carbon fibers in the substrate layer. The microporous layer has a fluorine content of 12wt% to 25wt%, and the water contact angle difference between the microporous layer and the substrate layer is Δ, where Δ satisfies 0°≤Δ≤5°. This gas diffusion layer not only has good water drainage and permeability, but also, through the stacked arrangement of the substrate layer and the microporous layer, which gives the substrate layer and the microporous layer similar water properties, effectively reduces the condensation of water vapor in the permeate gas within the gas diffusion layer, increases the humidity of the permeate gas, and thus effectively maintains the wettability of the proton exchange membrane fuel cell.

The present invention discloses an infiltration type directional drainage drainage ecological ditch, comprising a gravel drainage layer, a fine sand filtration layer, a permeable nutrient planting soil layer, an organic covering layer, plants and ground cover slopes, wherein the gravel drainage layer, the fine sand filtration layer, the permeable nutrient planting soil layer and the organic covering layer are arranged adjacent to each other from bottom to top, plants are planted on the surface layer of the infiltration type directional drainage drainage ecological ditch, ground cover slopes are arranged on both sides of the surface layer of the organic covering layer, and the ground cover slopes are connected to the organic covering layer and the surrounding site. Through the above-mentioned manner, the infiltration type directional drainage drainage ecological ditch of the present invention, the runoff rainwater generated on the ground during the rainy season can enter the sponge city treatment facility after being directed and drained through the ecological ditch, which can reduce surface overflow, and the ditch can purify, store and infiltrate rainwater along the way, and the plants growing in the ditch have the function of softening and beautifying the site.