442 results about "Capillarities" patented technology

The invention discloses a supported nickel catalyst for preparing 1, 3-propylene glycol through hydrogenation of 3-hydroxypropionaldehyde as well as a preparation method and application of the supported nickel catalyst, and relates to the technical field of catalysts. The modified long-chain multi-carbon inducer is used, and a special long-chain molecular structure and a branched chain group of the inducer can effectively and selectively adsorb and occupy a micropore impregnation site; the preparation method has the beneficial effects that more active component nickel species are obviously promoted to be dispersed in main reaction confinement spaces such as mesopores and macropores and interact with the carrier to form effective active sites, and active component steeping liquor is inhibited from entering micropore channels due to capillary action; the active site failure caused by agglomeration of nickel species in micropores in the subsequent drying and roasting process of the catalyst precursor is avoided, the efficient and directional reaction is ensured, the generation of by-products is greatly reduced, the pressure is relieved for the subsequent product rectification separation, and the final product purity is improved. The catalyst provided by the invention can still keep an excellent catalytic effect when the air speed of a 3-hydroxypropionaldehyde solution is increased to 6.5 h <-1 >.

The invention relates to the field of photovoltaic power generation, and particularly discloses a climate self-adaptive photovoltaic cooling method and system based on interface evaporation, and the system comprises a hydrophilic and hydrophobic composite radiation refrigeration film which is used for capturing atmospheric moisture through a radiation refrigeration effect under a low-radiation condition to form a cooling water source; the bionic water conveying structure comprises a modified silicone tube and a juncus roemerianus bundle and is used for conveying the captured water to the high-level water tank through capillary action; according to the invention, by fusing interface evaporation and radiation refrigeration technologies, the system realizes efficient cooling and energy recovery of the photovoltaic module; under the condition of strong irradiation, the gradient wettability interface evaporation layer takes away waste heat of the module through directional water film flow, so that the temperature of the photovoltaic module is reduced, the photoelectric conversion efficiency is improved, and meanwhile, the daily generating capacity is increased; the cooling effect is obviously better than that of a traditional natural convection or phase change material cooling mode, and efficient heat transfer is achieved through phase change latent heat utilization of interface evaporation.

Even if the cap is removed from the mouth of the container while the internal pressure of the container body has increased, the contents will not spray out through the connecting passage. [Solution] The container comprises a container body 11 for containing the liquid contents, a cylindrical stopper member 12 attached to the mouth 11a of the container body, and an impregnating material 13 attached to the inside of the stopper member and capable of impregnating the liquid contents. The stopper member comprises a containment cylinder 15 for containing the impregnating material with its upper end protruding, and a communication cylinder 16 that connects the inside of the containment cylinder and the inside of the container body. A communication passage 21 is provided between the containment cylinder and the impregnating material, connecting the inside of the communication cylinder and the upper end opening 15b of the containment cylinder. The communication cylinder has a main passage 22 that connects the communication passage and the inside of the container body, and a capillary passage 23 that connects the communication passage and the inside of the container body, and has a smaller flow path cross-sectional area than the main passage, causing capillary action, arranged in parallel.

A mesh woven structure with capillary action is applied to a two-phase fluid heat dissipation unit. The mesh woven structure includes multiple latitudinal lines and multiple longitudinal lines. At least two longitudinal lines are selectively arranged as a longitudinal line set. The mesh woven structure is woven from the single latitudinal line and one cooperative longitudinal line set, which sequentially repeatedly intersect (and overlap with) each other. Accordingly, the number of the voids of the mesh woven structure is increased so that the mesh woven structure has better capillary attraction and water collection (containing) ability to greatly enhance the heat transfer performance.

A liquid storage bottle including a groove or a rib that can hold, by capillary action, ink adhering to a nozzle tip part of the liquid storage bottle after the ink is supplied from the liquid storage bottle to a liquid tank, and a liquid replenishment system.

The utility model discloses a composite uniform-temperature plate which comprises a top plate. The bottom plate is buckled with the top plate, and a vacuum cavity is defined by the bottom plate and the top plate; the first supporting columns are arranged in the vacuum chamber and abut against the top plate and the bottom plate respectively; a plurality of drainage grooves are formed in the outer circumferential surface of the first supporting column; and the first capillary liquid absorption structure is arranged in the drainage groove. In the vacuum chamber, the drainage groove provides a special channel for flowing of the working medium, and the liquid working medium can be subjected to a stronger capillary action and can be quickly sucked back to a heating area, so that the capillary suction force of the composite vapor chamber to the working medium is enhanced, and the backflow speed is increased; meanwhile, the drainage groove is filled with the first capillary liquid suction structure, the capillary suction force of the liquid working medium in the vacuum cavity is further enhanced, the higher the capillary suction force is, the higher the flowing speed of the liquid working medium is, the working medium can flow back along the drainage groove at a higher speed, the backflow speed of the working medium can be further increased, and the service life of the working medium is prolonged. And the heat transfer efficiency of the composite vapor chamber is further improved.

The invention discloses a high-precision tool setting device for numerical control machining, which belongs to the technical field of numerical control machining and comprises a control system, a worktable, a tool arranged on the worktable, a tool setting gauge fixedly mounted on the worktable and a driving mechanism arranged on the worktable. The blow-off drying mechanism comprises fixing bases symmetrically and fixedly installed on the two sides of the tool setting gauge, a blowing assembly arranged on the two fixing bases, a first sensor and a second sensor, wherein the first sensor and the second sensor are arranged at the top and the bottom of the blowing assembly respectively. According to the numerical control machining high-precision tool setting device, the blow-off drying mechanism, the shielding protection mechanism and the driving mechanism are matched, air blowing, liquid removing and drying can be conducted on a tool nose of a tool firstly, meanwhile, an umbrella-shaped cover is used for protecting and shielding a tool setting gauge, contact tool setting is completed after resetting and avoiding are conducted, capillary acting force generated by a cutting liquid film is fundamentally eliminated, and the working efficiency is improved. Real and reliable contact between the tool nose and the tool setting gauge is guaranteed, and tool setting precision and repeated reliability are improved.

The invention discloses a plant cultivation system and method based on liquid-gas-solid three-state cooperative regulation, the plant cultivation system based on liquid-gas-solid three-state cooperative regulation comprises a cultivation container, a field planting skeleton, a degradation film and a regulation area; the planting framework is arranged in the cultivation container and divides the interior of the cultivation container into a liquid area, an air area and a substrate area, the degradation film covers the space between the air area and the substrate area, and a plant root system can pierce the degradation film from the substrate area through growth and extends to the air area and the liquid area. The capillary action of nutrient and temperature and humidity adjustment, water evaporation or liquid and substrate coupling can be obtained, the substrate can keep moist for a long time, plants are induced to form water roots and expand root growth space, fertilizer water can be circularly supplied through bottom liquid, the fertilizer water can be easily adapted to and controlled by plant growth requirements, and concentrated regulation and unified supply of the fertilizer water can be realized; labor is saved; and time efficiency is improved.

The invention relates to the technical field of solid-state batteries, and discloses a preparation method of a battery cell, which comprises the following steps: stacking a positive pole piece, a negative pole piece and a solid-state electrolyte layer according to the sequence of the positive pole piece, the solid-state electrolyte layer, the negative pole piece and the solid-state electrolyte layer to obtain a lamination structure; wherein at least one side of the negative pole piece in the circumferential direction exceeds the positive pole piece to form an overhang area, and sheet layer gaps are formed in the circumferential side surface of the laminated structure; enabling an overhang area of the lamination structure to extend downwards into the filler infiltration liquid, and enabling a lamella gap to be infiltrated and filled through capillary action to obtain the lamination structure with a filling layer; solidifying the lamination structure with the filling layer to fix the positions of the positive pole piece, the solid electrolyte layer and the negative pole piece; and performing isostatic pressing treatment to obtain the battery cell. The capillary force of the lamellar gaps is utilized, so that the filler infiltration liquid can automatically infiltrate and fill the lamellar gaps of the laminated structure under the capillary action, and the rapid and uniform filling effect is achieved. The invention further discloses a battery cell and a solid-state battery.

A porous wick based on a conformal metal metamaterial comprises a pipe body, a wick body is arranged in the pipe body in a sleeved mode, the wick body comprises a conformal design porous structure, gaps of the porous structure are filled with the metal metamaterial, and a design method of the porous structure comprises the steps that mesh generation is conducted on a model of the wick body, and after mesh generation, the wick body is made of the metal metamaterial. A conformal design method is adopted to fill each gap of a wick with a metal metamaterial, the wick is prepared through a 3D printing manufacturing technology, the unit cell geometrical shape of the metamaterial can be regulated and controlled according to the actual situation of a porous structure, the metal metamaterial is introduced, the highly optimized porous structure is adopted, and the performance of the wick is improved. The capillary action and the liquid transmission efficiency of the wick are remarkably improved, the parameters such as porosity, unit cell size and microstructure type can be adjusted, and the capillary capacity and the fluid flowing path are optimized.

The Janus mesh for fog harvesting is a mesh with a superhydrophobic side and an opposed hydrophilic side. The Janus mesh is formed from a brass mesh with opposed first and second sides. The first side has the hydrophobic layer formed thereon and the second side has the hydrophilic layer formed thereon. The hydrophobic layer is formed from ZnO nanowires and stearic acid, and the hydrophilic layer is formed from just the ZnO nanowires. The Janus mesh is made by growing the ZnO nanowires on the first and second sides of the brass mesh using a calcining step. The first side of the brass mesh is sprayed with stearic acid to form the hydrophobic layer. The second side is treated with ultraviolet radiation to degrade any of the stearic acid that migrated to the second side via capillary action, thus forming the hydrophilic layer made from just the ZnO nanowires.

The invention discloses an accelerator neutron source solid-state lithium target cooling device, and relates to the technical field of accelerator neutron source medical application. An annular heat pipe is arranged on the outer ring of the side portion of an oxygen-free copper substrate, a plurality of liquid absorption cores are arranged on the inner wall of the heat pipe, and meanwhile an inner cavity of the heat pipe is filled with a working medium; when heat is generated, the heat is firstly transferred to the oxygen-free copper substrate, the evaporation section of the heat pipe is heated, the working medium in the wick is quickly evaporated and gasified, the generated steam flows to the condensation section under the driving of differential pressure and is condensed into liquid in the condensation section and releases heat, and the liquid generated by condensation returns to the evaporation section again under the capillary action of the wick. The space of the arranged heat pipe is large, and in the aspect of heat dissipation, the working medium is subjected to gas-liquid phase change in the heat pipe under the action of the liquid absorption core, so that the accelerator is rapidly dissipated, heat on the solid target material film can be rapidly taken away, and the cooling effect on the accelerator is greatly improved.

The invention relates to a high-salt-tolerance asymmetric solar interface evaporator and a preparation method. Nano-crystalline cellulose with low thermal conductivity is used as a base material, carbon black with good photothermal conversion performance is used as a photothermal layer, methyltrimethoxysilane is used as a hydrophobic modifier, and the high-salt-tolerance asymmetric solar interface evaporator with a vertical pore channel structure is constructed through a directional freezing technology. The evaporator is composed of a cellulose hydrophilic lower layer and a carbon black hydrophobic upper layer, water can be rapidly transported to an evaporation interface through the capillary action of cellulose, the carbon black hydrophobic upper layer can improve the light absorption capacity and the heat positioning capacity of the evaporator, and continuous and efficient water evaporation is achieved. Cellulose cation modification and an asymmetric structure can reduce the generation of salt crystals, can significantly improve the salt resistance of the evaporator, has a good application prospect in the field of solar seawater desalination, and has wide practical application potential due to easy preparation, enlargement and low cost.

The invention discloses a porous Tesla valve micro-channel heat exchanger and a manufacturing method thereof.The micro-channel heat exchanger comprises a bottom plate and a cover plate, a solid medium substrate is formed on the upper end face of the bottom plate, and the solid medium substrate is made of a porous heat conduction material; a Tesla valve flow channel is formed in the solid medium substrate and used for enabling a working medium to be in one-way conduction, and a rough surface is arranged on the inner bottom wall of the Tesla valve flow channel; the cover plate covers the bottom plate, and a containing cavity is formed in the lower end face of the cover plate and used for containing the solid medium substrate. Steam countercurrent in the boiling heat exchange process is restrained through the Tesla valve flow channel, and the two-phase flow stability of boiling heat exchange is enhanced; nucleation sites are provided through the rough surface of the inner bottom wall of the flow channel of the Tesla valve and the porous structure of the inner side wall, meanwhile, the moisture of the heat exchange surface in the channel is maintained through the capillary action, and the boiling heat exchange efficiency is enhanced.

A rapid dual test kit (1) for DHA and EPA detection and method of preparation thereof; that detects DHA and EPA within 0-20 minutes, preferably 1 min; comprising of-a test device (2), a test diluent (29), a dropper (32), a pack insert (33) and a silica gel (34), an immuno-chromatographic strip (3) further comprising of a sample release pad (5), a conjugate pad (6), a nitrocellulose membrane (7), and an absorbent pad (8) arranged in a sequential overlapping manner over a backing material (4); encased in a test device (2) consisting of three open areas namely a sample port (11), test line viewing area (30), and control line viewing area (31); allowing lateral flow of sample (29) from sample release pad (5) to absorbent pad (8) via capillary action; and the method of preparation of kit is disclosed.

The application discloses a surface treatment process of an antistatic and low-fuzz surgical drape, and relates to the field of layered products.The treatment process comprises the following steps: S1, using a dielectric barrier discharge plasma to treat the surgical drape; S2, using a padding method or a spraying method to apply an antistatic agent solution; S3, uniformly spraying an end-capping agent solution on the surface of the drape treated in the step S2; and S4, steam sterilization, and obtaining the antistatic and low-fuzz surgical drape after cooling.The low-melting-point polymer is compounded with the water-soluble end-capping agent, and combined with high-pressure steam sterilization, so that the polymer can migrate to the end along the capillary effect of the fiber surface after contacting the surface of the drape, and the auxiliary film-forming agent can be instantaneously swelled when meeting water vapor, the polymer can be guided to wrap the fiber end breaking point, and the polymer can be solidified to form a microspherical mechanical lock after cooling.The physical wrapping mechanism of the application can more completely control the falling of the fuzz, so that the risk of foreign body reaction or infection of a surgical incision caused by the falling of the fuzz can be further reduced.

This invention belongs to the field of electrocatalytic hydrogen evolution catalyst technology, and particularly relates to an ultrasmall intermetallic compound confined in mesoporous carbon interstices and its preparation method. Using mesoporous silica SBA-15 as a hard template, sulfur-containing amino acids are filled into the SBA-15 channels via capillary action as a carbon source. Simultaneously, potassium chloroplatinate and a transition metal source are also filled into the SBA-15 channels along with the sulfur-containing amino acids. The mass ratio of potassium chloroplatinate, SBA-15, and sulfur-containing amino acids is 1:5–10:20–30, and the metal mass is consistent with the atomic ratio in the formed Pt-based intermetallic compound. The reaction also includes a solvent and water. This invention uses electrocatalytic hydrogen evolution as a model reaction to investigate the catalytic activity and stability of this PtFe ultrasmall nanoparticle embedded in a mesoporous carbon support. Electrocatalytic results show that it exhibits excellent activity and stability, meeting the requirements of related applications and development.

The utility model provides an oil cup for lubricating an elevator guide rail, which relates to the technical field of elevator accessories, and comprises an oil storage cavity, a connecting piece, a sealing cover, an extension cavity, a lubricating component, a sliding block, a through groove, a guide plate, an iron block, an electromagnet, an elastic piece, a sleeve and a cotton rope cluster, according to the oil cup, when a lift car of an elevator moves, the cotton rope cluster can make contact with the surface of a guide rail, lubricating oil is drained to the surface of the guide rail through the capillary action of the cotton rope cluster to lubricate the surface of the guide rail, and when the lift car of the elevator does not move, the lubricating oil is drained to the surface of the guide rail through the capillary action of the cotton rope cluster. The cotton rope cluster is separated from the surface of the guide rail, and meanwhile the cotton rope cluster is retracted into the extension cavity, so that lubricating oil cannot be guided to the surface of the guide rail through the cotton rope cluster, and meanwhile the lubricating oil can flow back into the extension cavity and the oil storage cavity, consumption of the lubricating oil is reduced, the frequency of adding oil into the oil storage cavity is reduced, and it is guaranteed that an elevator can be continuously and normally used.

The utility model relates to a through hole detection device based on a conductive medium and a conductive microprobe, and belongs to the technical field of semiconductor manufacturing equipment and microelectronics. The device comprises an object carrying disc which is used for placing a sample wafer to be detected, and an electrode column is arranged in the object carrying disc; the transparent circuit substrate is arranged above the carrying disc, a conductive microprobe directly facing the sample wafer on the carrying disc is arranged on the transparent circuit substrate, the conductive microprobe is used for being in contact with the conductive medium to detect the conductivity injection mechanism of the through hole, and the transparent circuit substrate is used for injecting the conductive medium into the carrying disc. The conducting medium enters the through hole of the sample sheet under the capillary action to form a liquid column; and the observation device is arranged above the transparent circuit substrate and is used for observing the conductive medium in the through hole and the contact condition between the conductive microprobe and the conductive medium. According to the utility model, the conductive probe is combined with the carrying disc, the through hole is detected by using the conductivity and capillary action of the liquid metal, and the test efficiency is high.

The invention provides a chip self-correction mounting method based on a high-surface-energy solder, and belongs to the technical field of semiconductor packaging. According to the method, elementary substances or oxides of at least one metal of Re, Os, W, Ir, Ru, Mo, V, Nb, Co and Ni are selected as first components of the solder, elementary substances or oxides of at least one metal of Fe, Pt, Ti, Hf, Zn, Ag, Cu, Sn, In and Bi are selected as second components of the solder, elementary substances of S or graphite are used as filling and doping components, and the solder can be prepared by using the high surface tension of the solder in a molten state. And automatic correction of the chip is realized in combination with the Malangori effect and the capillary acting force. The method is compatible with an existing packaging production line, the chip inclination rate can be reduced, the mounting precision and the device reliability are improved, and the method is suitable for high-density packaging scenes such as 5G chips and power devices.

A living wall system generally having a number of layers including a waterproof membrane layer for preventing water and moisture from seeping to the building structure or wall in which the living wall system is installed. Next, a number of growing medium layers are provided having a wicking fabric layer between them, the growing medium typically of felt. The wicking fabric layer ensures even watering and smooth capillary action. The front growing medium layer has plant pockets for holding plants.

A nicotine e-vaping device may include a device body configured to receive a nicotine cartridge. The nicotine cartridge includes a nicotine pre-vapor formulation, a wick, and an integral heater-thermocouple. The wick is configured to transport the nicotine pre-vapor formulation by capillary action. The integral heater-thermocouple includes a first segment made of a first alloy and a second segment made of a second alloy. The device body includes a power supply, at least one sensor, and a controller. The power supply is configured to deliver electrical energy to the integral heater-thermocouple to heat the nicotine pre-vapor formulation to generate a nicotine vapor. The at least one sensor is configured to measure a voltage difference between the first segment and the second segment of the integral heater-thermocouple during such heating. The controller is configured to adjust the electrical energy to the integral heater-thermocouple based on the measured voltage difference.

The invention belongs to the technical field of high polymer materials, and discloses an adhesive reliability test sample preparation method which comprises the following steps: sequentially stacking a lower substrate part, two supporting parts which are horizontally arranged at intervals and an upper substrate part along the vertical direction, and fixing by adopting a fixing structure, the lower substrate part is provided with a dispensing platform exceeding the upper substrate part; a needle tube is adopted to suck a to-be-tested adhesive to be dispensed on the adhesive dispensing platform, and the adhesive fills a space between the lower substrate piece and the upper substrate piece under the capillary action to form a sandwich structure; curing the adhesive; the surface of the sandwich structure is polished, so that the surfaces of the cured adhesive, the upper substrate part and the lower substrate part are flush in the length direction of the supporting part; and drying the sandwich structure. By adopting the preparation method, the adhesive reliability test sample which is simple in structure, not easy to generate additional damage and capable of accurately simulating a target interface can be obtained.

The utility model relates to vehicle technical field, specifically disclose a fastener, vehicle body and vehicle, and the fastener can be connected with the surface abutment of the connecting piece through the abutment surface, the fastener is provided with the flow channel, the flow channel penetrates the abutment surface and the outer surface except the abutment surface of fastener, the flow channel can form the outflow channel, break the continuous gap structure, interfere with the formation of capillary action, thereby reduce the infiltration and accumulation of electrophoretic paint liquid between fastener and connecting piece, and the flow channel can provide the outflow path for the liquid in the gap between fastener and connecting piece, when the liquid drainage process, liquid can be discharged outward through the flow channel, reduce the residual amount in the gap, thereby reduce the outflow amount of liquid when drying. And drying process, the flow channel provides the pressure relief channel, reduces electrophoretic paint liquid because of the pressure difference is extruded and forms the flow mark, reduces electrophoretic polishing process, guarantees the anticorrosive performance and appearance quality of vehicle body.

Disclosed in the present invention is an air humidifier based on capillary phenomenon and natural evaporation. The air humidifier comprises a top water injection box (1), a bottom water receiving box (2), a supporting structure (3) and a plurality of evaporation assemblies. Each evaporation assembly comprises an evaporation plate (6) and two water absorption strips (7) connected to the top thereof, and the two water absorption strips (7) are detachably mounted on two opposite sides of the water injection box (1) respectively, such that the evaporation plates (6) are hung under the water injection box (1), thereby fully utilizing the space under the water injection box (1), and significantly increasing the evaporation area. The water absorption strips (7) draw water from the water injection box (1) to the evaporation plates (6) through the capillary action, such that the water naturally evaporates into the air, thereby achieving silent, energy-efficient, and healthy humidification.

A misting device for aeroponically cultivating plants in a growing chamber provided with fluid in a water reservoir, comprising: an ultrasonic atomization transducer (UAT) configured to generate a misting spray in the presence of fluid; and a wicking means configured to transport fluid from the water reservoir by capillary action to the ultrasonic atomization transducer, when the lower end of the wicking means is disposed in contact with the water reservoir. Also disclosed is a growing system for aeroponically cultivating plants comprising: a growing chamber for containing the plants, and provided with a water reservoir containing fluid; and misting devices. The misting devices are oriented such that the respective misting sprays interact with each other to create an ultra-fine mist inside the growing chamber. In some aspects, the water reservoir may further comprise nanobubbles to maintain elevated dissolved oxygen levels and improve root-zone oxygenation.

The present invention discloses a photovoltaic panel passive cooling system that automatically absorbs water and evaporates it for cooling based on capillary action. The system comprises: a photovoltaic panel, a photovoltaic bracket, a wicking material, a water supply assembly, a water pipe, a water storage tank, and an adjustment and fixing assembly. The photovoltaic panel is fixedly mounted via the photovoltaic bracket and can be mounted horizontally, tilted, or vertically. The ends of the water supply assembly are arranged horizontally along the two side edges of the photovoltaic panel. The wicking material is attached to the back of the photovoltaic panel, with its lower end extending into the water supply assembly. The water supply assembly is connected to the water storage tank via a water pipe. The adjustment and fixing assembly connects the water supply assembly and the photovoltaic panel, respectively, and is used to adjust the vertical position of the water supply assembly. The present invention achieves energy-saving, water-saving, efficient, and reliable photovoltaic panel cooling, thereby improving the power generation efficiency and operating life of the photovoltaic system.

The invention discloses a detection method of inflammatory marker protein. According to the method, the micro-fluidic chip with a sample loading area, a buffer treatment area, a sample channel and a detection area is prepared on filter paper through wax printing; chitosan is preset in the sample loading area and is used for treating a sample, and bromothymol blue is fixed in the detection area and is used as a pH indicator. During detection, a sample is driven by a phosphate buffer solution with the pH value of 6.0 to flow to a detection area through capillary action, the C-reactive protein and the indicator are subjected to non-specific binding, so that the color of the detection area is changed from yellow to green, the length of a green developing signal is in direct proportion to the concentration of the CRP, and quantitative detection can be realized by measuring the length. The method does not need an antibody, is low in cost, is simple and convenient to operate, can complete detection within 15 minutes, has the detection limit of 1.56 ng / ml and the linear range of 5-25 ng / ml, and is suitable for rapid screening and field detection of basic medical institutions.

The present invention relates to the technical field of microfluidics, and in particular to a microfluidic chip and a testing method thereof. The microfluidic chip comprises: a body, a first sample loading hole formed in the body, and sample separating channels communicated with the first sample loading hole, wherein: an anti-blocking region is provided between the sample separating channels and the first sample loading hole, and comprises a first surface formed by being raised in a direction moving away from the lower surface of the body, and a second surface connected to the lower surface; sample separating inlets of the sample separating channels are formed in the second surface; at least two first protrusions formed by protruding toward the lower surface are provided on the first surface, wherein first transition channels are formed between adjacent first protrusions; second transition channels are formed between the at least two first protrusions and the second surface, separately, and the second transition channels are adjacently connected to the sample separating inlets. By means of the arrangement of double-stage transition channels, the present invention can ensure that a blood sample can be smoothly separated under capillary action while filtering the blood sample.