84results about How to "Increased hindrance" patented technology

The invention relates to an ultraviolet photo-cured coating for the electrostatic prevention of the surface of plastic and a preparation method thereof, in particular to a photo-cured coating containing conductive powder of a metal oxide system or composite conductive powder. The coating comprises the following compositions in weight percent: 30 to 70 percent of oligomer, 25 to 65 percent of active thinner, 0.5 to 10 percent of light evocating agent, 5 to 40 percent of conductive powder, 0.2 to 8 percent of additive and 0 to 50 percent of solvent. As the added conductive powder of the metal oxide system and the composite conductive powder is white or light color, the prepared photo-cured has the characteristic of easy color modulation, has lasting antistatic property, high rigidity and wearing resistance, can be used for electrostatic prevention of the surface of electronic equipment, plastic vessel, shell of an electric appliance, office supplies, sports equipment and other plastic products.

In the invention, the composite bullet-proof armour plate consists of a metal panel, a honeycomb core board, a ceramic wafer core and a metal rear panel bonded with the metal brazing layer via the organic adhesive layer. The preparing method is that using the brozing and the line-cutting method are finished the honeycomb core board and the plain or curved ceramic wafer core, whose size must fit in that of the honeycomb hole of the honeycomb core board. The panel and the rear panel must be made of the bullet-proof steel plate through heat treating after cold rolling. The Ag72Cu metal brazing material and the epoxy resin group high strength structural sizing for connecting the interface are assembly welded.

The invention discloses a floating breakwater with multiple columns of fence type wave stopping insertion plates and a design method of the floating breakwater, and belongs to the field of offshore engineering. The floating breakwater is composed of a plurality of breakwater units, a wave stopping wall is distributed on the wave facing side of the upper portion of a rectangular floating box of each breakwater unit, a plurality of T-shaped installation holes are reserved in the middle of each rectangular floating box, and the multiple columns of insertion type wave stopping plates are formed through embedding, fixing and joining. Each rectangular floating box is connected to a sinking block through an anchor cable and is then anchored in a design zone, and the breakwater units are in meshed connection through hooks. According to the floating breakwater, the water limiting effect is formed by the multiple columns of wave stopping plates, water bodies around the wave stopping insertion plates are used for increasing the additional mass of the overall floating breakwater, the inertia and the overall stability of the floating breakwater are improved, and motion of floating bodies is not limited by anchoring only; and meanwhile, the fence type wave stopping insertion plates give consideration to energy transformation of reflection energy dissipation and turbulent fluctuation energy dissipation on the aspect of energy dissipation, and the wave dissipation effect of the breakwater can be obviously improved.

The invention relates to a preparation method of copper-silver composite powder. The copper-silver composite powder has a coated nuclear-shell structure; a nuclear layer is made of copper-silver alloy, and the shell layer is made of silver. The preparation method comprises the steps: firstly, adding a mixed aqueous solution of AgNO3 and Cu(NO3)2.3H2O into a mixed aqueous solution consisting of a reducing agent and a dispersing agent to obtain a copper-silver alloy solution containing the reducing agent; then adding an AgNO3 aqueous solution into the copper-silver alloy solution containing the reducing agent, and leading silver to be deposited and coated on the surface of the copper-silver alloy; and then obtaining the 0.3-3mum copper-silver composite powder after filtering, cleaning, drying and surface densified treatment. In the obtained copper-silver composite powder, the coating of the outer-layer silver is uniform, the compact density is high, the conductivity is good, and the high-temperature oxidation resistance is strong.

An amplified condensing LED light lens and a module thereof are disclosed. The lens is a downwardly tapered cup structure having a first light-incident surface and a second light-incident surface concavely disposed at the bottom of the amplified condensing LED light lens to form a containing space and a light-incident hole, and the containing space is provided for containing a light emitting source, and a residual light blocking structure is protruded from the first light-incident surface for blocking a residual light of the light emitting source. If the distance between the first light-incident surface and the light-incident hole is S, the distance between the bottom of the residual light blocking structure and the light-incident hole is L, 0<L<(⅜)*S, and S≧0.8*D, the residual light blocking structure can hinder the occurrence of a residual light phenomenon caused by the reflection of the light emitting source from the second light-incident surface.

The invention discloses an aluminum alloy material and a method for manufacturing double-zero foil by using the same. The aluminum alloy material comprises the following components in percentage by weight: 0.09-0.15% of Si, 0.75-1.05% of Fe, 0.03-0.05% of Mn, 0.02-0.03% of Ti, not more than 0.01% of Cu, not more than 0.01% of Mg, not more than 0.01% of Cr, not more than 0.01% of Zn and the balance of Al. The aluminum alloy disclosed by the invention has small grain size, fine surface quality and high tensile strength; and the double-zero foil finished product produced from the aluminum alloy material has pinhole rate of less than 200 / m<2>, the tensile strength of 85-100 MPa and the elongation of greater than 2.5%.

A flash memory device forming method is disclosed and comprises the following steps: a semiconductor substrate having word line digit line zones and source line floating gate zones, floating gate oxidation layers and floating gate layers that stretch across the word line digit line zones and the source line floating gate zones are formed on parts of the semiconductor substrate, isolating layers positioned at two sides of the floating gate oxidation layers and the floating gate layers are formed in the semiconductor substrate, dielectric layers covering the word line digit line zones are formed, first openings are arranged between the dielectric layers, first side walls are formed on side walls of the first openings, the floating gate layers and the floating gate oxidation layers positioned at bottom parts of the first openings are removed, and second openings are therefore formed; in the first openings and the second openings, source line films are formed on the first side walls and the dielectric layers, the source line films on the first side walls and the dielectric layers are removed via grinding operation, and an excessive grinding amount in grinding processes can be obtained according to distance between surfaces of top parts of the isolating layers and surfaces of top parts of the floating gate layers; after the dielectric layers, the floating gate layers and the floating gate oxidation layers at the word line digit line zones, word line structures are formed at the word line digit line zones. Via use of the method, a programming crosstalk failure occurrence can be lowered.

The invention discloses a heat treatment method for an Mg-Al-Zn-Y rare-earth magnesium alloy. The method comprises the following steps: performing hot extrusion on a rare-earth magnesium alloy ingot, wherein the extrusion temperature is 340+ / -5 DEG C, the extrusion ratio is 5-7, and performing air cooling to room temperature after extrusion; and performing heat treatment on the extruded deformation material, namely preserving the temperature to 402-408 DEG C for 5-7 hours, and performing air cooling to room temperature; and preserving the temperature to 180-190 DEG C, and finally performing air cooling. The Mg-Al-Zn-Y rare-earth magnesium alloy comprises the following elements in percentage by weight: 8.3-9.7 percent of Al, 0.37-1.0 percent of Zn, 1.85-1.95 percent of rare earth element Y and the balance of Mg. The hot extrusion process and heat treatment are combined; due to heat treatment, a beta-Mg17Al12 strengthening phase in the Mg-Al-Zn-Y rare-earth magnesium alloy in an extruded state has dispersed distribution in grains and grain boundary, the precipitated phase is uniform and fine, and the generated rare earth phase Al2Y is in corner passivation and is mainly distributed in grains, so that the mechanical property is obviously improved.

The invention discloses a BCT / BZT-system lead-free monocrystal epitaxial multilayer energy storage film and a preparation method thereof. The preparation method has the advantages that the radio frequency magnetron sputtering technology is adopted, a BCT / BZT multilayer film is obtained on a substrate through plasma bombardment of target materials, films with different periods but same thicknessesare prepared through regulation of the sputtering time of the two target materials, the obtained films can have epitaxial multilayer heterostructures, part of the current paths can be stopped at the interfaces, and breakdown is effectively suppressed; as the interfaces increase, the hindrance effect of internal current branches on materials is enhanced, so that the energy storage film prepared bythe method has extremely high energy efficiency while the huge energy storage density is achieved; the energy efficiency of 8-cycle samples is more than 65%, most of them are more than 70%, and the efficiency of 4-cycle samples can be more than 80%.

The invention relates to a ginseng leaf extractive manufacturing method and a cosmetic composition comprising the ginseng leaf extractive serving as an effective ingredient, and discloses a skin external cosmetic composition and a manufacturing method therefor. Compared with a conventional method which takes a pure ginseng leaf extractive as the ginseng leaf extractive of a conventional processed product, the method further improves the antioxidant effect and the activity inhibition and expression inhibition effect of matrix metalloproteinase through the ginseng leaf extractive (0.001-10.0% by weight) produced through a boiling-on-grain method or a method of stir-baking with vinegar. The composition can inhibit the activity of monophenyl oxidase and further improves the darkening skins or prevents the hyperpigmentation of the skin.

The invention belongs to the technical field of coal mine safety and particularly relates to an inhibitor for inhibiting high-sulfur coal from spontaneous combustion. The inhibitor for inhibiting high-sulfur coal from spontaneous combustion comprises the following ingredients by mass percent: 15-17 percent of MgCl2, 2-5 percent of ZnCl2, 0.1-0.2 percent of NH4Cl, 0.5-1 percent of sodium dodecyl sulfate, 0.3-0.5 percent of sodium tetraborate and the balance of solvent water. The inhibitor for inhibiting high-sulfur coal from spontaneous combustion can guarantee the wettability of coal, effectively prevents active structures in coal from reacting with oxygen, avoids temperature rise of coal, and therefore, achieves a favorable inhibition effect.

The invention discloses a preparation method of a Cu-Cr-Zr wear-resistant alloy wire. The method comprises the following steps: S1, powder metallurgy: firstly, preparing a Cu-Cr alloy or Cr-Zr alloy or Cu-Cr-Zr alloy or a combined alloy thereof into powder with the diameter of 50-300 [mu]m, then, carrying out dry pressing or sintering on the powder to prepare a block material, and finally, crushing the block material into particles with the size of 1-10 mm for later use; and S2, smelting: firstly, smelting 50-90% of cast ingot raw materials into an alloy solution under a vacuum condition at the smelting temperature of 1,200to 1,370 DEG C, keeping the vacuum degree at 10<-2> to 10<-5>MPa, keeping the temperature at 1,200 to 1,300 DEG C after complete smelting, and refining to remove impurities and gas. According to the process, the wear-resistant alloy wire with higher tensile strength, better wear resistance, better corrosion resistance and higher conductivity can be prepared, it can be seen from the microscopic structure of the product that the second phase is distributed in a dispersed mode, and the wear resistance and the mechanical property of the material are well improved.

The invention discloses a preparation discloses a preparation method of a lithium zinc titanate / carbon nanometer composite negative electrode material for a lithium ion battery. The preparation methodcomprises the steps of firstly, performing liquid-phase reaction on a lithium source, a titanium source, a zinc source and a carbon source to form a metal complex, and performing oil bath heating toobtain precursor sol; and secondly, performing microwave processing to obtain the composite negative material for the lithium ion battery. Carbon-coated lithium zinc titanate prepared by the method islow in energy consumption, short in reaction time and uniform in particles; moreover, the electrochemical performance of the battery prepared by employing the carbon-coated lithium zinc titanate usedas a negative active material is excellent, and the capacity initial value of a lithium zinc titanate battery reaches 238.3mAh / g through cycle performance test under current density of 100mA / g; and after circulation for 10 times, the specific capacity is stilled maintained about 240mAh / g, the electrochemical performance is maintained very well, and the lithium zinc titanate battery has a favorable application prospect.

The invention discloses a reverse osmosis membrane and a preparation method thereof. The reverse osmosis membrane comprises a support layer, a separation layer and a pollution-resistant layer, whereinthe support layer, the separation layer and the pollution-resistant layer are sequentially stacked from inside to outside, the separation layer has a cross-linked polyamide structure and is obtainedby carrying out interfacial polymerization on polyamine and polyacyl chloride, and the pollution-resistant layer is formed by branching and polymerizing 2,3-epoxypropane sodium sulfonate to the surface of polyamide through heat treatment under the action of a curing accelerator. According to the preparation method, 2,3-epoxypropane sodium sulfonate is branched and polymerized to the surface of a polyamide membrane, so that the hydrophilicity of the membrane is improved, the surface of the membrane is negatively charged, and the anti-pollution capability of the membrane to anionic surfactants or other negatively charged pollutants is improved; and the epoxy group is subjected to a self-polymerization reaction under the action of an accelerator to form a compact polymer layer, so that the hindering effect on salt ion penetration is improved so as to improve the salt rejection rate of the membrane.

The invention discloses an epoxy resin based micron-nano composite material and a preparation method thereof. The epoxy resin based micron-nano composite material comprises an epoxy resin base, and silicon dioxide particles and montmorillonoid uniformly dispersed in the epoxy resin base, wherein the content of the silicon dioxide particles is 4.0 weight percent of the epoxy resin base; the content of the montmorillonoid is 1.0 weight percent of the epoxy resin base. Through the epoxy resin based micron-nano composite material and the preparation method thereof provided by the invention, the epoxy resin based micron-nano composite material with a favorable electrical tree inhibiting ability and corona corrosion resistant performance is prepared, and the preparation method of the epoxy resin based micron-nano composite material is simple in steps, so that the epoxy resin based micron-nano composite material is suitable for mass production, and has favorable industrial prospect and application prospect.

The invention relates to a double-air-bag rigidity stepless adjustable oil-gas spring. The oil-gas spring comprises a main working cylinder, an oil tube connected with the upper end of the main working cylinder and an auxiliary working cylinder connected with the other end of the oil tube. The auxiliary working cylinder comprises an auxiliary cylinder barrel connected with the oil tube, a damping valve assembly arranged in the auxiliary cylinder barrel, two air bags and two air bag bases arranged on one side of the damping valve assembly symmetrically, a partition plate arranged between the two air bags, a connection pipe arranged at the other end of the auxiliary cylinder barrel, a solenoid valve arranged on the connection pipe, an oil pumping pipe and an oil return pipe which are connected with the solenoid valve, an oil pump arranged on the oil pumping pipe and an oil tank connected with the oil pumping pipe and the oil return pipe. A ventilation hole is formed in the partition plate. According to the oil-gas spring, the rigidity characteristic of the oil-gas spring is expanded to a changeable range with value assigned freely from a non-linear curve line, the problem of requirement 'contradiction' of the safety and comfort for the suspension system during vehicle traveling is solved, and the whole vehicle adaptability to various traveling conditions is improved.

The invention provides cyperaceae crop weeding suspoemulsion as well as a preparation method, application and an application method thereof, which relate to the technical field of agriculture. The cyperaceae crop weeding suspoemulsion provided by the invention comprises prometryn, s-metolachlor and flumioxazin, the action mechanisms of prometryn, s-metolachlor and flumioxazin on weeds are different, prometryn, s-metolachlor and flumioxazin can be mutually matched and promoted after being mixed according to a specific proportion, and the hindering effect on weed growth is enhanced. Thesuspoemulsion not only has a relatively high control effect onannual weeds unearthed, but also has a relatively high control effect on part of weeds which are unearthed during pesticide application, and is high in safety to cyperus esculentus. The preparation method of the cyperaceae crop weeding suspoemulsion is simple and convenient, and the prepared cyperaceae crop weeding suspoemulsion is good in stability and can be used for weed control of cyperaceae economic and medicinal crop fields.

The invention aims to provide an intelligent deceleration strip for the municipal engineering road, when an ambulance needs to pass, the deceleration strip body can be rapidly adjusted to be parallelto the road surface, and the structure of the deceleration strip is stable. The intelligent deceleration strip comprises the components of: a shell, wherein the upper surface of the shell is providedwith a mounting opening and is flush with the road surface; a deceleration strip body which comprises an extrusion plate and two deceleration plates, the two deceleration plates are hinged to the upper surface of the shell, and the extrusion plate is supported on the lower surfaces of the two deceleration plates; and a lifting mechanism which controls the extrusion plate to ascend and descend so that the deceleration strip body can form a protruding structure higher than the road surface or a structure parallel to the road surface.

The invention provides a prismatic cavity blade tip for controlling leakage flow of a movable blade tip of a turbine. At the blade tip of a movable blade of the turbine, a plurality of prismatic cavities are formed from the front edge to the tail edge of the movable blade of the turbine; and the ratio of the maximal depth h of the prismatic cavities to the height H of the movable blade of the turbine is 0.5%-4%. According to the prismatic cavity blade tip for controlling the leakage flow of the movable blade tip of the turbine provided by the invention, a part of leaking fluid which enters a clearance enters the prismatic cavities to form vortex in a rolling way; at one hand, the dynamic energy of the fluid in the clearance is dissipated; on the other hand, a jet flow stop effect is achieved on the fluid in the clearance above the cavities; and thus the aim of controlling the leakage flow of the blade tip of the turbine is realized; the leakage amount of the blade tip of the turbine isreduced; the size and strength of leakage vortex of the blade tip are reduced; leakage related loss of the turbine is reduced; the efficiency of the turbine is improved; and furthermore the prismaticcavity structure can reduce the weight of the blade of the turbine.

The invention relates to a highway construction safety protection system, and belongs to the field of building construction. The highway construction safety protection system comprises a plurality of protection units which are sequentially connected, wherein each protection unit comprises a protection base and a supporting rod arranged at the top of the protection base; a connecting chain is arranged between every two adjacent protection bases; a plurality of connecting guardrails are arranged between every two adjacent supporting rods; a warning board is arranged on one of the connecting guardrails; a plurality of anti-collision bases are distributed on each protection base in the height direction of the protection base; a first buffer assembly is arranged on the surface, away from the corresponding protection base, of each anti-collision base; and a second buffer assembly is arranged between each anti-collision base and the corresponding protection base. The highway construction safety protection system has the effects that the protection performance of a construction site is improved, and the safety of workers in the construction process is guaranteed.

The invention relates to a nanofiltration membrane, a preparation method thereof and application of the nanofiltration membrane in the field of water treatment. The nanofiltration membrane comprises a supporting layer and a polyamide separation layer which are attached to each other, and phytic acid is chelated on the surface of the polyamide separation layer. The polyamide separation layer and the phytic acid are chelated and crosslinked, so that the phytic acid is chelated on the surface of the separation layer. The phytic acid and amino groups on the surface of the polyamide functional layer are subjected to chelation cross-linking reaction, so that the cross-linking density of the polyamide separating layer is improved, and the hindering effect on salt ion permeation is enhanced; on the other hand, after the surface of the polyamide is modified by phytic acid, the hydrophilicity of the membrane is improved, and permeation of water molecules is facilitated. In addition, the nanofiltration membrane provided by the invention has excellent salt rejection rate and water permeability, the preparation method is simple, and the nanofiltration membrane has great industrial application prospects.

The invention relates to the technical field of flue gas treatment and particularly discloses a high-temperature waste gas dust collection method which comprises the following steps: (1) introducing aflue gas from the bottom of a dust collection tower, and discharging the flue gas from the top of the dust collection tower after passing through a filtering layer in the dust collection tower; (2) while the flue gas is introduced into the dust collection tower, spraying water down from the top of the dust collection tower; (3) collecting water from the bottom of the dust collection tower, wherein the water sprayed down from the top of the dust collection tower is water collected from the bottom of the dust collection tower. Due to the adoption of the filtering layer, the flue gas can be adsorbed, the flue gas has a large contact area with the filtering layer when passing through the filtering layer, and in addition, when the flue gas is introduced from the bottom of the dust collection tower, the water is sprayed down from the top of the dust collection tower, and the water also has a dust collection function when being in contact with the flue gas, so that a dust collection effect can be improved.

The present invention discloses a controlled-release insect trapping device with strong timeliness and belongs to the technical field of insect trapping. The controlled-release insect trapping devicewith strong timeliness includes a conical trapper shell and a rainproof cap fixedly connected to the top end of the conical trapper shell. Light trapping and sex trapping combination way is adopted, so that the trapping range is widened to a certain extent; an electric shock way is not required; meanwhile, an inner trapping layer of the conical trapper shell is provided with a controlled-release trapping particle string by which a sex attractant and a binder in a sac may outwards permeate under the condition that a certain temperature is generated by illumination of lamplight, and the binder coming out just now forms a new binding layer on a fiber trapping net, so that the phenomenon that an old binding layer is covered with dust to lose a binding function, while the synchronously releasedsex attractant also plays a role in trapping non-phototactic insects; and both the sex attractant and the binder are controlled-release so as not to be completely consumed within short time, and thus, the service time of the sex attractant and the binder is effectively prolonged.

The invention relates to a preparation method of bulletproof composite ceramic, and belongs to the technical field of ceramic matrix composite materials. The bulletproof composite ceramic is obtainedthrough preparation of a pure ceramic green body, preparation of a composite ceramic green body and vacuum hot-pressing sintering. The high-toughness carbon fiber and the ceramic body are subjected tohot pressed sintering, so that the hardness and the toughness of the bulletproof ceramic are greatly improved, and the capability of resisting multiple strikes of armor-piercing bombs and armor-piercing incendiary bombs is achieved.

The invention discloses a high-temperature oxidation-resistant titanium alloy containing extremely low alloying elements, and belongs to the field of titanium alloy materials. The titanium alloy comprises the chemical components of, by mass, at least two elements of tungsten (W), niobium (Nb), tantalum (Ta) and silicon (Si), wherein the content of each of the W, Nb and Ta elements is not more than0.8%, the content of the Si element is not more than 0.6%, the total amount of the added alloy elements is not more than 1% and not lower than 0.2%, and the balance titanium (Ti); and the room-temperature tensile mechanical property of the titanium alloy is that the yield strength is 150-500 Mpa, the tensile strength is 200-600 Mpa, and the elongation rate is 15-45%. The titanium alloy has excellent oxidation resistance in the air with the temperature of 600-900 DEG C, heat preservation is carried out on the titanium alloy in the air with the temperature of 650-850 DEG C for 100 hours, the oxidation rate does not exceed 30-80% of industrial pure titanium TA1, and the lowest oxidation rate can reach 9.4-40% of the oxidation rate of the industrial pure titanium TA1.

The invention discloses a double-shaft electric toothbrush, and relates to the field of articles of daily use. The double-shaft electric toothbrush comprises a handle, a connecting rod and a brush head, a motor is arranged in the handle, a transmission mechanism is arranged in the connecting rod, and the brush head comprises a protection shell. Two parallel rotary shafts are arranged in the protection shell, a plurality of brushes are arranged on the surfaces of the rotary shafts, a protruding strip is arranged at the position, between the two rotary shafts, of the inner surface of the protection shell, and a strip-shaped groove is formed in the front face of the protruding strip. The double-shaft electric toothbrush has the advantages that during use, the two rotary shafts with the brushes are placed in the mouth in the mode of corresponding to upper teeth and lower teeth respectively, the motor enables the two rotary shafts to rotate in opposite directions through the transmission mechanism, and therefore the upper teeth and the lower teeth can be brushed at the same time. When the two rotary shafts rotate in the opposite directions, all the brushes of the two rotary shafts scratch the front face of the protruding strip, sundries and dirt of the brushes are removed and collected in the groove, and meanwhile the double-shaft electric toothbrush has the advantage of being easy to replace and clean.

The present invention relates to an angle section of the blade rotor of a low-pressure compressor of an axial turbine engine compressor. The section comprises an arc external lantern ring (30) installed at the external housing of the turbine engine compressor in a concentric mode and an internal lantern ring. The section also comprises a row of rotor blades (42) extending in a radial direction and pitched in the lantern ring (30), and a blade box is form in such manner. The blades (42) of the box comprise the pitching legs (50) at the external end portion, wherein the pitching legs (50) are arranged in the thickness of the external lantern ring (30). The internal lantern ring comprises a pile used for pitching the blades (42).

A method for producing a photocurable liquid resin which comprises (A) a step of producing a conjugated diene-based polymer or a conjugated diene / aromatic vinyl-based copolymer, which has a weight-average molecular weight of 5,000 to 40,000 and a molecular weight distribution of 3.0 or smaller, by polymerizing a conjugated diene-based monomer or a combination of a conjugated diene-based monomer and an aromatic vinyl-based monomer in a saturated hydrocarbon-based solvent using a dilithium initiator, (B) a step of producing a conjugated diene-based polymer polyol or a conjugated diene / aromatic vinyl-based copolymer polyol by reacting the produced polymer or copolymer with an alkylene oxide, (C) a step of producing a hydrogenated conjugated diene-based polymer polyol or a hydrogenated conjugated diene / aromatic vinyl-based copolymer polyol by hydrogenating the produced polymer polyol or copolymer polyol, and (D) a step of reacting the hydrogenated polymer polyol or copolymer polyol with a compound having a photocurable unsaturated hydrocarbon group. A material comprising the produced resin exhibits excellent barrier property against water vapor, excellent heat resistance and a hardness suitable for a material having rubber elasticity and is advantageously used as sealing a material.

The invention relates to a device for filtering sand-containing viscous liquid. The invention adopts a technical scheme that a medium connector (5) and a lower connector (6) are fixed on the upper endand the lower end of a lower sleeve (3) respectively; a round plane of the lower connector (6) is provided with 10 to 100 pores; a raised ring of the medium connector is provided with a circle of 10to 50 pores; a proportion of the length K of the lower sleeve (3) and the length L of an inner cartridge filter (4) and an outer cartridge filter (2) is 1:(1.5-3); two ends of the inner cartridge filter (4) and the outer cartridge filter (2) are respectively fixed on the inner surface and the outer surface of raised parts of an upper connector (1) and the medium connector (5) with a mounting clearance of between 5 and 105mm; filter pores of the inner cartridge filter (4) and the outer cartridge filter (2) are grid-shaped pores with length-width ratio of (10-700):1; the shape of the cross section of the grid-shaped pore is in a flaring shape, wherein the larger end of the flaring shape is outward. The device can obviously reduce blocking effect of the filter pores on the viscous liquid, inparticular to crude oil, enables the viscous liquid to pass through the filter pores easily so as to achieve an oil-well pump, and simultaneously maintains the blockage effect on sands.