1033 results about "Oil absorption" patented technology

The copper bar machining and drawing device based on the self-lubricating mechanism comprises a base, the top of the base is fixedly connected with a treatment barrel, the interior of the treatment barrel is rotationally connected with a rotating disc, and the two sides of the rotating disc are provided with an impurity removing assembly and an oil coating assembly correspondingly; according to the device, impurity removal treatment before the copper rod is oiled is achieved through the impurity removal assembly, meanwhile, the effect of independent annular cutting machining on the end of the copper rod can be additionally achieved, so that the convenience of drawing machining is improved, then the device is combined with the oiling assembly, lubricating oil is extracted and sprayed to the surface of the copper rod after impurity removal, the independent lubricating effect is achieved, and the machining efficiency is improved. The oil absorption sponge is driven to make contact with the copper bar and intermittently extruded, excessive lubricating oil is adsorbed and intercepted to prevent waste, the lubricating oil is evenly coated, the efficient self-lubricating effect is achieved, and continuous self-impurity-removal type lubricating drawing machining of the copper bar is achieved under cooperation of the drawing assembly.

The invention provides a graphite negative electrode active material and a preparation method thereof, a secondary battery and an electric device, the graphitization degree of the graphite negative electrode active material is 88-93%, and the oil absorption value of the graphite negative electrode active material is not more than 50ml / 100g. The graphite negative electrode active material can improve the cycle performance of the battery and prolong the service life of the battery.

The invention relates to the technical field of electric power engineering materials, in particular to a polypropylene-based semiconductive shielding material, a preparation method thereof and a cable. The polypropylene-based semiconductive shielding material provided by the invention is prepared from the following components in parts by weight: 34 to 63 parts of polypropylene resin, 7 to 28 parts of ethylene-propylene copolymer elastomer and 20 to 30 parts of conductive carbon black, wherein the crystallinity of the polypropylene resin is 30%-35%, and the melting point of the polypropylene resin is 155-160 DEG C; the mass percent of vinyl in the ethylene-propylene copolymer elastomer is 14%-18%; the carbon black oil absorption value of the conductive carbon black is 145 mL / 100 g to 150 mL / 100 g. In the polypropylene-based semi-conductive shielding material provided by the invention, the polypropylene resin and the ethylene-propylene copolymer elastomer have excellent compatibility, so that the use of the elastomer can be effectively reduced, and the polypropylene-based semi-conductive shielding material has the advantages of relatively low cost and excellent mechanical strength and electrical performance.

The temperature sensing material of the present invention contains 100 parts by mass of a thermoplastic resin (A) having its density, MFR and durometer A hardness in specific ranges, 10 to 100 parts by mass of a compound (B) having a flash point of 155° C. or higher, and 1.5 to 20 parts by mass of a porous inorganic compound (C) having an oil absorption of 4.0 g / g or more, in which a content of the compound (B) is more than 200 parts by mass and less than 700 parts by mass relative to 100 parts by mass of the porous inorganic compound (C), and the temperature sensing material has specific optical properties.

The invention discloses a multifunctional physical therapy device, which comprises a shell; the scraping therapy end head is arranged at one end of the shell, and a volatilization hole is formed in the scraping therapy end head; the moxibustion module is arranged in the shell, and the moxibustion module fixes the moxa cake and volatilizes the medicine property of the moxa cake to the volatilization hole to be output; the oil absorption module is arranged in the shell and between the scraping therapy end and the moxibustion module, and the oil absorption module absorbs oil input into the shell from the volatilization hole; the power supply module is arranged in the shell, the power supply module is connected with the scraping therapy end head and the moxibustion module, and the power supply module supplies power to the scraping therapy end head and the moxibustion module and outputs a control signal. According to the device, multiple functions such as smokeless moxibustion, scraping therapy and massage are deeply integrated and optimized, the convenience, comfort and effect of physical therapy are greatly improved, a user can enjoy multiple traditional Chinese medicine physical therapy services only through one device, and therefore the diversified requirements of modern people for health care are met.

The invention provides a semiconductive shielding material as well as a preparation method and application thereof. The semiconductive shielding material is prepared from the following raw materials in parts by mass: 59 to 63 parts of matrix resin, 34 to 38 parts of conductive carbon black, 1 to 1.5 parts of a cross-linking agent, 0.5 to 2 parts of a dispersing agent, 0.5 to 3 parts of a lubricating agent and 0.5 to 1.5 parts of an antioxidant. The iodine absorption value of the conductive carbon black is gt; the oil absorption value is greater than or equal to 140mL / 100g, and the compression oil absorption value is gt; 90 mL / 100 g, 325-mesh screen residues are less than or equal to 10 ppm, and the ash content is 1t; and 0.1%. The preparation raw materials of the semi-conductive shielding material provided by the invention adopt specific raw material components and proportions, and particularly adopt the conductive carbon black with specific performance parameters as the conductive filler, so that the prepared semi-conductive shielding material has excellent electrical properties and mechanical properties, and can meet the requirements of cable materials under a high voltage grade.

The invention provides a PBT / PPO alloy material suitable for online spraying and a preparation method of the PBT / PPO alloy material. The alloy material is prepared from the following raw material components in parts by weight: 50 to 60 parts of PBT (Polybutylene Terephthalate), 15 to 25 parts of PPO (Polyphenylene Oxide), 8 to 12 parts of a toughening agent, 0.5 to 2 parts of a lubricating agent, 0.2 to 1.0 part of an antioxidant and 1 to 2 parts of conductive carbon black, wherein the conductive carbon black is obtained by modifying carbon black, the iodine absorption value of the carbon black is 1000-1400 mg / g, the oil absorption value of the carbon black is 300-340 mL / 100 g, and the finally prepared PBT / PPO composite material has high flowability, high impact, high heat resistance and good spraying performance and can be used for manufacturing parts with high weather resistance requirements such as automobile charging port covers and door handle decoration covers.

The invention relates to the technical field of sewage treatment, and discloses a domestic sewage treatment device which comprises a sewage treatment box, a cleaning box, a roller conveying part, a guide roller and an oil absorption film, two symmetrically-arranged conveying roller pieces are installed on the sewage treatment box, two symmetrically-arranged guide rollers are rotationally installed in the sewage treatment box, the conveying roller pieces and the guide rollers are sleeved with the oil absorption film and matched with the oil absorption film, and first openings for the oil absorption film to enter and exit are formed in the two sides of the sewage treatment box correspondingly. A driving piece for driving the conveying roller piece to drive the oil absorption film to operate is mounted on the sewage treatment box. According to the invention, sewage is introduced into the sewage treatment box, the oil absorption film is in contact with the sewage liquid level, and the driving part is utilized to drive the conveying roller part to enable the oil absorption film to continuously operate, so that grease in sewage is continuously adsorbed, and compared with a traditional filter screen filtering mode, the method has the advantages that the problem of filter screen blockage is avoided, the filter screen does not need to be frequently replaced, and the cost is reduced. And the continuity and high efficiency of cleaning the grease in the sewage are ensured.

The invention provides ardealite-based self-leveling mortar and a preparation method and application thereof, and belongs to the field of construction.The ardealite-based self-leveling mortar is prepared from, by mass, 75-90 parts of anhydrite, 5-15 parts of in-situ exciting agent, 5-10 parts of chemical exciting agent, 0.06-0.1 part of defoaming agent, 0.06-0.1 part of stabilizer and 0.2-0.4 part of water reducing agent; wherein the anhydrous gypsum is II type anhydrous gypsum with D90 smaller than or equal to 30 m, the stacking density of the II type anhydrous gypsum is 0.5-1.5 g / cm < 3 >, and the oil absorption value is 40-60 ml / 100 g. The anhydrite is synergistically excited through the in-situ exciting agent and the chemical exciting agent, under the assistance of the auxiliary agent, the breaking strength and compressive strength of the self-leveling mortar can be improved, the initial setting time of the self-leveling mortar is longer than or equal to 2 h, the final setting time of the self-leveling mortar is shorter than or equal to 8 h, and the use standard of the building field is met.

The invention belongs to the technical field of silicon dioxide preparation, and particularly relates to a preparation method of a spherical silicon dioxide anti-blocking agent for a plastic film, and the method comprises the following steps: 1) preparing spherical silicon dioxide particles by a flame method; and 2) carrying out surface modification on silicon dioxide. According to the prepared silicon dioxide anti-blocking agent, the content of SiO2 is 90%-99.9%, the content of iron is smaller than or equal to 0.01 ppm, the content of sodium ions is smaller than or equal to 0.6 ppm, and the silicon dioxide anti-blocking agent has the advantages of being narrow in particle size distribution (D50: 150-1000 nm), excellent in dispersity, low in oil absorption value (15-30 mL / 100 g) and the like. The modified silicon dioxide is compounded with a plastic matrix to prepare a film, and compared with a plastic film without the silicon dioxide anti-blocking agent, the silicon dioxide anti-blocking agent can remarkably improve the anti-blocking performance and mechanical properties of the plastic film, for example, the tensile strength is improved by 10-30%, the elongation at break is improved by 10-30%, and the light transmittance is larger than 92%. Meanwhile, the thermal oxidation yellowing phenomenon caused by metal ions can be effectively inhibited.

In order to solve the problem that the existing water-based conductive coating is poor in adhesive force on the surface of an aluminum foil containing greasy dirt, the invention provides a carbon material and a preparation method thereof, a water-based conductive coating and a carbon-coated aluminum foil, and the preparation method comprises the following steps: uniformly mixing water, an alcoholizing agent and the carbon material, and performing alcoholization treatment; modifying the alcoholized carbon material by using a surface modifier which comprises one or more of hydroxyalkanoates or phosphates, so as to obtain a modified carbon material; according to the invention, alcoholization treatment is carried out on the carbon material to increase hydroxyl groups for grafting on the surface of the carbon material; modifying the carbon material by using a surface modifier; the modified carbon material has certain rolling oil affinity, can cooperate with the characteristic of high oil absorption value of the carbon material when being applied to the water-based conductive coating, and can open'blocking 'of an oil film, so that polar groups in coating resin are in contact with a base material to generate acting force, and the adhesive force is improved; and the carbon material filling amount can be further increased to reduce the coating resistance.

The invention relates to the technical field of oil-water separation, in particular to a super-hydrophobic foam copper sheet, a preparation method and application thereof and a foam copper box. The invention provides a super-hydrophobic foam copper sheet. The super-hydrophobic foam copper sheet comprises a foam copper sheet body and a hydrophobic coating located on the surface of the foam copper sheet body. The hydrophobic coating is obtained by calcining preparation raw materials including a fluorinated ethylene-propylene copolymer, polyvinylidene fluoride, polyurethane and hydrophobic silicon dioxide nanoparticles. The super-hydrophobic foam copper sheet can realize continuous and rapid oil absorption, and has excellent oil-water separation efficiency.

To provide a water-based flexographic ink excellent in drying property, leveling property and transfer property.SOLUTION: There is provided a water-based flexographic ink comprising an acrylic resin emulsion, barium sulfate, and a styrene-maleic acid resin. The water-based flexographic ink according to claim 1, wherein the barium sulfate has an average particle size of 0.1 to 2 μm. The water-based flexographic ink according to claim 1 or 2, wherein the barium sulphate has an oil absorption of 10 to 100 ml / 100 g. The water-based flexographic ink according to claim 1 or 2, further comprising a color pigment.SELECTED DRAWING: None

The invention relates to a negative electrode material and a preparation method thereof, a negative electrode plate and a lithium ion battery, the negative electrode material comprises a silicon-based active substance and a carbon material, the oil absorption value of the negative electrode material is O mL / 100g, the specific surface area is S m < 2 > / g, the particle size concentration ratio of the negative electrode material is P1, P1 is equal to (D80 + D50) / (D50 + D20), the physical rebound capacity of the negative electrode material is T, T is equal to 0.01 * O * S / P1, and T is greater than 0.20 and less than 1.20. The negative electrode material disclosed by the invention has relatively low physical rebound capability, and the volume of a pole piece prepared from the negative electrode material is not easy to rebound after compaction, so that relatively high compaction density can be obtained, and excellent cycle performance is exerted.

The invention belongs to the technical field of inorganic non-metallic material processing, and discloses superfine active silica powder and a preparation method thereof. The preparation method of the superfine active silica powder comprises the following steps: mixing silica powder, a part of a surface modifier and water, and grinding to obtain superfine silica powder slurry; and drying the superfine silica powder slurry, mixing with the residual surface modifier, modifying, and cooling to obtain the superfine active silica powder. The obtained superfine active silica powder is high in whiteness, high in fineness, low in oil absorption, low in moisture content, high in activation degree and low in magnetic impurity content, and can be applied to the high-grade, high-precision and advanced industrial field.

The invention belongs to the field of composite materials, and particularly relates to super-hydrophobic MOF-based polyurethane sponge added with a green inorganic flame retardant and used for oil-water separation and a preparation method of the super-hydrophobic MOF-based polyurethane sponge. The preparation method comprises the following steps: firstly, preparing Ni-MOF by adopting a solvothermal method, then respectively grafting the Ni-MOF and Mg (OH) 2 / Al (OH) 3 to octadecyltrimethoxysilane / dodecyltrimethoxysilane, and then loading Ni-MOF-ODTMS / DTMS and Mg (OH) 2 / Al (OH) 3-ODTMS / DTMS onto a polyurethane sponge by using polydimethylsiloxane as an adhesive, so as to obtain the MOF-based polyurethane sponge. The polyurethane sponge shows excellent super-hydrophobicity / super-lipophilicity and oil-water separation capacity, and the oil-water separation efficiency still reaches 99.2% after 10 times of circulation oil absorption. Meanwhile, the MOF-based polyurethane sponge shows excellent flame retardant property, so that the possibility of secondary fire caused by petroleum leakage accidents is avoided.

The invention discloses mold pressing equipment for alloy powder casting, and relates to the field of alloy powder casting, the mold pressing equipment comprises a driving seat and a frame, a mold frame is slidably arranged at the top in the frame, a bottom mold is rotatably arranged at the top of the driving seat, a plurality of groups of mold grooves are formed in the bottom mold, and a base plate is arranged in each mold groove; a jacking plate is arranged at the top of the base plate, an inner cavity is formed in the base plate, an oil absorption layer matched with the inner cavity is arranged on the outer wall of the base plate, and a top die matched with the bottom die is rotationally arranged in the die frame. When the top die drives the die body to slide downwards, the top die is adjusted through the fixed gear to rotate by a certain angle, so that the top die can be adaptively adjusted along with adjustment of the bottom die, a jacking plate is extruded to slide downwards, and a first opening in a sealing plate and a second opening in a base plate are in an overlapped state; the release agent is adsorbed through the oil absorption layer, and the inner wall of the mold cavity is coated with the release agent.

The invention relates to a tinting base for a tinted coating composition, in particular for forming a tinted coating on a board material, comprising - at least one organic polymer binder with a glass transition temperature (TG) according to EN ISO 16805 > 45°C, preferably > 50°C, furthermore preferably > 55°C, - at least one filler made of barium sulfate and / or calcium carbonate, having (iii) an average particle size D50 of 1-20 µm, preferably of 1-15 µm, furthermore preferably of 2-10 µm, and (iv) an oil absorption according to DIN EN ISO 787-5 of 1-22 g / 100 g, preferably of 2-18 g / 100 g, furthermore preferably of 3-15 g / 100 g, - at least one wax, - conventional additives and - water. The invention further relates to a tinted coating composition for forming a tinted coating on a panel material.

The invention discloses a riverway revetment with a water pollution treatment function, which comprises a plurality of straight sheet piles arranged in sequence, connecting pieces are arranged between adjacent straight sheet piles, sliding grooves are respectively formed in two sides of each straight sheet pile, each connecting piece comprises a central shaft, two ends of each central shaft are respectively connected with sliding blocks, the sliding blocks are slidably mounted in the sliding grooves, and the central shafts are connected with the sliding blocks. A roller is rotatably sleeved on the central shaft, a plurality of oil absorption felts and a plurality of flexible microporous membrane bags are mounted on the roller, and microbial fillers are filled in the flexible microporous membrane bags. According to the invention, the oil absorption felts can absorb oil stains gathered near the sheet piles, and the oil absorption felts can be regularly replaced and cleaned, so that the pollution of domestic sewage discharge to water in a river channel is reduced. And organisms in the microbial filler in the flexible microporous membrane bag are used for carrying out biological treatment on organic matters in the water. And the flexible microporous membrane bag is convenient to replace. The connecting piece can be used for connecting the straight plate pile and can swing along with water waves, and the acting effect of the oil absorption felt and the flexible microporous membrane bag is improved.

The invention relates to the technical field of gas purification and drying, in particular to zero-gas-consumption blast heat regeneration drying equipment which comprises a double-tower type drying mechanism, an air filtering mechanism, an air blower, a fixing plate and a filtering plate, the air filtering mechanism comprises a filtering chamber, a filtering net, an adsorption layer and an oil absorption layer, and the filtering plate is arranged before air is sucked into the air blower; when the air is sucked into the air blower and conveyed to the filtering chamber through the air blower, the impurities in the air can be filtered again through the matched use of the filter screen, the adsorption layer and the oil absorption layer, and the air purification effect is improved; according to the double-tower drying device, the air is filtered to prevent impurities contained in the air from influencing the service life of the drying device, and as the impurities in the air are filtered before and after the air enters the air blower and before the air enters the double-tower drying mechanism, the impurities in the air are prevented from influencing the normal use of the double-tower drying mechanism.

The utility model discloses a defoaming type oil tank with a heating device, which comprises an oil tank body, a partition plate and the heating device, the partition plate is arranged in the oil tank body to divide the oil tank body into an oil absorption area and an oil return area, the oil absorption area and the oil return area are communicated with each other, a heating area is formed in the communicated area of the oil absorption area and the oil return area, and the heating device is arranged in the heating area. The heating device is installed on the oil tank body and located in the heating area. According to the defoaming type oil tank with the heating device, the partition plate is arranged to divide the oil tank into the oil suction area and the oil return area, so that flowing of oil in the oil tank becomes more regular, bubbles are reduced, the heating device is arranged at the communicating position of the oil suction area and the oil return area, and therefore the heating effect is improved. And oil liquid entering the oil absorption area subsequently can be effectively heated, it is ensured that the oil liquid needing to be circulated subsequently is heated, and the heating effect is better.

The invention discloses a blockage prediction and alarm system for an oil absorption filter, and relates to the technical field of prediction and alarm, the system comprises a data acquisition module, a data processing module, a blockage quantification module and a prediction and alarm module, the data acquisition module periodically acquires the running state data of the filter; the data processing module adopts a Pauta criterion to eliminate abnormal data, calculates a unit flow pressure difference and a pressure difference change rate, and eliminates oil temperature viscosity interference through a viscosity-temperature characteristic compensation model to obtain a standard pressure difference; the blockage quantification module obtains an ideal pressure difference through a clean filter element baseline model, calculates an original blockage coefficient, and corrects through a time domain residual fusion mechanism to obtain a residual calibration blockage coefficient; the prediction and alarm module constructs a blockage time sequence prediction model based on the long-short-term memory network, generates a blockage coefficient prediction value in the next acquisition period to decide whether to trigger sound-light alarm, and realizes the preposed sensing and alarm of the blockage risk of the oil absorption filter.

The utility model discloses an oil collecting device for dismantling waste equipment, which relates to the field of dismantling of waste equipment and comprises a water tank and a cleaning pool, the cleaning pool is fixedly arranged at the upper end of the water tank, and the bottom of the cleaning pool is communicated with the water tank through a plurality of drain holes. A transversely-arranged reciprocating lead screw is rotationally arranged on the upper portion of the interior of the water tank through a first bearing, the rod wall of the reciprocating lead screw is movably sleeved with a lead screw nut matched with the reciprocating lead screw, the front side and the rear side of the lead screw nut are rotationally provided with longitudinally-arranged rotating rods through second bearings, and the rod wall of each rotating rod is fixedly sleeved with an oil absorption felt. A driving mechanism for driving the reciprocating lead screw to rotate is arranged outside the water tank, and the two opposite ends of the rod walls of the two rotating rods are fixedly sleeved with gears. The oil cleaning device can effectively remove and collect oil in water for cleaning, prevents the oil from flowing to cause environmental pollution, can reuse clean water, saves resources, and is convenient for people to use.

The invention relates to the field of preparation of a conductive material for a cable shielding material, and discloses a preparation method, a production system and application of a conductive filler for a high-voltage cable shielding material, the preparation method comprises the following steps: S1, mixing a first solution containing raw material oil with a carbon black raw material in a spray form to obtain a mixed material; wherein the oil absorption value of the carbon black raw material is 180-220 (10 <-5 > m < 3 > / kg); wherein the content of aromatic hydrocarbon in the raw oil is 70-85wt%, and the content of asphaltene in the raw oil is lower than 0.1 wt%; s2, in the presence of carrier gas, enabling the mixed material to flow in a heating section, and carrying out indirect heat exchange with high-temperature fluid; the temperature of the high-temperature fluid is not lower than 1800 DEG C, and the heat exchange time is 30-120 s. The conductive filler prepared by the preparation method has relatively high structural degree and graphitization degree, and can meet the performance requirements of cable shielding materials.

The utility model belongs to the technical field of environment emergency disposal, and discloses a water pollution and oil contamination intercepting device which comprises an intercepting sleeve, a clamping block is installed at one end of the intercepting sleeve, a plurality of installation holes are formed in one side of the clamping block in a penetrating mode, a clamping base is arranged at the other end of the intercepting sleeve, a plurality of installation holes are formed in the two sides of the clamping base in a penetrating mode, and a connecting rope is installed at the bottom end of one side of the clamping base. A cylinder is mounted at the other end of the connecting rope, a plurality of trapezoidal grooves are formed in the peripheral side of the cylinder, a fixing mechanism is mounted at the top end of one side of the clamping seat, a pair of first mounting seats is symmetrically mounted on one side of the intercepting sleeve, a sliding block is slidably mounted between the pair of first mounting seats, and a plurality of oil suction plates are mounted on one side of the sliding block; threaded holes are formed in the two ends of the pair of first installation bases and the two ends of the sliding block. According to the device, the single intercepting sleeve can be quickly mounted and dismounted, so that the overall length of the intercepting device is adjusted, the flexibility and adaptability of the intercepting device are improved, and meanwhile, the intercepting effect of the intercepting device is improved through the arrangement of an oil absorption plate.

The utility model relates to the field of water-jet looms, and discloses a novel yarn guide plate for a water-jet loom, which comprises a bottom plate, a plurality of placing grooves are arranged on the upper surface of the bottom plate, positioning grooves are arranged on the outer walls of two sides of each placing groove, and fixing grooves are arranged at the front end and the rear end of the inner bottom surface of each placing groove. A supporting rod is arranged in the containing groove, and positioning blocks are fixedly connected to the front end and the rear end of the lower end of the outer wall of the supporting rod. Compared with an existing yarn guide plate, the yarn guide plate has the advantages that through the arrangement of the oleophobic box, the spinning yarn penetrates through the upper end of the oleophobic groove and the lower end of the oleophobic block, and then the oleophobic cover is connected with the oleophobic box through the connecting block, so that the oil absorption sponge is attached to the spinning yarn; and therefore, stretching oil in the oil storage box flows into the oleophobic block through the circulating hole and then is wiped on the spinning yarn through the oil absorption sponge, and the smoothness and the antistatic property of the spinning yarn are improved.

The invention discloses a preparation method of silica-containing hair fluffing spray, which comprises the following steps: raw materials and preparation tools are prepared, the raw materials comprise water, polyethylene glycol-32, silica, ethanol, sodium laureth sulfate, sodium methyl cocoyl taurate, polyethylene glycol-8, magnesium aluminum silicate and essence, and the raw materials comprise water, polyethylene glycol-32, silica, ethanol, sodium laureth sulfate, sodium methyl cocoyl taurate, polyethylene glycol-8, magnesium aluminum silicate and essence; a preparation tool comprises a container, a digital thermometer, an electronic balance, a filter, a heating plate, a pH meter, a stirrer and a spray bottle, raw materials in a phase A, a phase B, a phase C and a phase D are sequentially weighed, the raw materials in the phase A are added into the container, the heating plate is used for heating and stirring, after the raw materials in the phase A are evenly mixed, the raw materials in the phase B are added into the container, and mixing and stirring are conducted; and cooling the mixed liquid, and carrying out temperature detection. According to the invention, # imgabs0 # 200 silica is used as a raw material, so that the oil absorption capacity can be effectively enhanced, meanwhile, pores cannot be blocked, and other scalp problems caused by pore blockage are avoided.

The invention discloses a range hood energy efficiency test method and system, and the method comprises the steps: selecting a typical oil smoke region set, constructing an oil stain anomaly detection model, marking abnormal points in the typical oil smoke region set based on the oil stain difference before and after oil suction, and carrying out the oil smoke test at the abnormal points. The method comprises the steps of obtaining a deviation distribution function based on a variable change condition, obtaining a time energy efficiency factor set and a space energy efficiency factor set, constructing an objective function, determining weights of factors in the time energy efficiency factor set and the space energy efficiency factor set, and constructing an energy efficiency test model based on the objective function and the weights of the factors. And obtaining test results of the range hood under different gears by using the energy efficiency test model. The method improves test comprehensiveness, improves scientificity and accuracy of product energy efficiency evaluation, has good interpretability, and can be directly applied to an energy efficiency test system of the range hood.

The utility model discloses a plunger pump rear cover with a vortex type oil duct structure, which is provided with a central axis, an oil suction channel and an oil outlet channel are distributed along the first radial direction of the central axis, the central axis is positioned between the oil suction channel and the oil outlet channel, and the outer end of the rear cover is provided with an oil suction port and an oil outlet which are connected with one ends of the two channels. The oil suction channel comprises a first channel section and a second channel section, the first channel section is connected with the oil suction port, the large end of the second channel section is connected with the first channel section, and the small end of the second channel section is connected with the oil suction crescent groove. The distance between the hole center of the small end of the second channel section and the central axis of the rear cover is smaller than the distance between the hole center of the large end of the second channel section and the central axis of the rear cover, and the hole diameter of the small end of the second channel section is the same as the radial width of the oil absorption crescent groove. The structure solves the problems that an existing rear cover is prone to turbulent flow, cavities, pressure loss and overlarge in size, and the high rotating speed and compact type requirements of the plunger pump are met.

The invention provides a construction method of a low-internal-resistance lithium ion battery based on a graphene-carbon nanotube three-dimensional conductive structure, which comprises the following steps: step 1, preparation of a three-dimensional conductive composite material: preparing the three-dimensional conductive composite material from graphene oxide (the thickness is 0.8-1.2 nm, and the number of layers is less than or equal to 3), carboxylated carbon nanotubes (the tube diameter is 20-50nm, the thickness is 0.8-1.2 nm, and the number of layers is less than or equal to 3), and the graphene-carbon nanotube three-dimensional conductive composite material is The preparation method comprises the following steps: mixing the raw materials (the length-diameter ratio is greater than or equal to 500) and conductive carbon black (the DBP oil absorption value is greater than or equal to 300cm < 3 > / 100g) according to the mass ratio of (1.5-3): (1-2): (0.5-1), and performing argon protection treatment in a ball mill with the power density being greater than or equal to 200W / L for 2-4 hours to form a premix; the electrochemical performance is improved, the overall internal resistance of the battery is smaller than or equal to 8 m omega (the traditional battery is larger than or equal to 20 m omega), the 5C discharge capacity retention ratio is larger than or equal to 88% (the traditional battery is smaller than or equal to 70%), the mass energy density is larger than or equal to 320 Wh / kg, the volume energy density is larger than or equal to 750 Wh / L, the capacity fading after 2500 times of circulation is smaller than or equal to 15% (the traditional silicon-based battery is smaller than or equal to 500 times), and the 1C discharge capacity at-20 DEG C is larger than or equal to 85% of normal-temperature capacity (the traditional battery is smaller than or equal to 60%). The lithium ion diffusion coefficient is greater than or equal to 1 * 10 <-10 > cm < 2 > / s.