47results about How to "Prevent crystallization" patented technology

The utility model discloses a structure for preventing crystallization of a liquid discharging main pipe of a crude foil engine, which comprises an anode tank and a liquid feeding distributor arranged on the lower side of the anode tank, the anode tank is connected with a backflow main pipe through a backflow branch pipe, and the liquid feeding distributor is connected with a liquid discharging branch pipe communicated with the liquid discharging main pipe. The backflow main pipe and the liquid discharging main pipe are both communicated with the dirty liquid tank, a control valve is installed on the liquid discharging branch pipe, an anti-crystallization communicating pipe is arranged between the backflow branch pipe and the liquid discharging main pipe in a communicating mode, and the end, connected with the backflow branch pipe, of the anti-crystallization communicating pipe is higher than the end, connected with the liquid discharging main pipe, of the anti-crystallization communicating pipe. And by arranging the anti-crystallization communicating pipe, the fluid in the backflow branch pipe can be drained into the liquid discharging main pipe, so that the liquid discharging main pipe is always flushed by the fluid when the equipment normally operates, and the crystallization condition is avoided.

This application relates to the field of food processing technology, specifically disclosing a freeze-resistant lava-filled popping bead, its preparation method, and its application. The freeze-resistant lava-filled popping bead comprises an inner core liquid, a popping bead wall material liquid, a curing liquid, and a storage liquid. The inner core liquid comprises the following raw materials in parts by weight: 80-120 parts white sugar, 3-6 parts calcium salt, 30-60 parts edible alcohol, and 41-68 parts water. The preparation method is as follows: white sugar, calcium salt, edible alcohol, and water are mixed until dissolved to obtain the inner core liquid; alginate, glycerin, pectin, and acidic substances are mixed with water until dissolved to obtain the popping bead wall material liquid; calcium salt, chitosan, and water are mixed evenly to obtain the curing liquid; fructose syrup, edible alcohol, and water are mixed evenly to obtain the storage liquid; the inner core liquid is added dropwise to the popping bead wall material liquid for a coating reaction; excess adhesive is filtered out and washed away; the bead is then placed in the curing liquid and the storage liquid in sequence; after packaging and high-temperature sterilization, the finished product is obtained. It has the advantage of bursting and lava-filled core when eaten frozen.

The utility model discloses a beaker placing tray for a battery tester, which belongs to the technical field of battery testing equipment and comprises a base, a plurality of accommodating grooves are uniformly distributed at the top of the base along the circumferential direction, and elastic clamping mechanisms are arranged on the inner walls of the four sides of each accommodating groove. A beaker is positioned through four-direction synchronous clamping, one side of the base is rotationally connected with an openable cover plate through a hinge piece, a plurality of sealing assemblies are installed on the bearing face of the cover plate, the sealing assemblies and the corresponding containing grooves form an axial alignment relation, and when the device is closed, multi-stage sealing protection is formed. Through structure optimization, stable positioning of the beaker, multi-stage sealing protection and ordered cable management are realized.

The present application relates to the technical field of external use patch, disclose a kind of neck shoulder waist leg pain health care patch and its preparation method, the health care patch includes backing layer, ointment layer and anti-adhesion release layer;Ointment layer raw material includes: traditional Chinese medicine extract flow leaching paste, L- (+) -tartaric acid, PVP K30, PEG-400, ternary eutectic solvent, polyacrylate pressure sensitive adhesive matrix and ultrafine medicinal powder.Preparation, after flow leaching paste, tartaric acid etc. are mixed, gel precursor is formed by vacuum dewatering and dealcoholization, swelling is added again with eutectic solvent, and then mixed with pressure sensitive adhesive matrix and medicinal powder high shear, finally coating solidification.The present application constructs physical crosslinking gel network in colloid interior and promotes effective component acid-base salt formation, effectively avoids polar component crystallization precipitation, reduces the skin irritation caused by drug burst release, simultaneously improves the cohesion of ointment, realizes long-acting smooth drug release.

This invention provides a confined grafted network antifreeze hydrogel, its preparation method, and its applications. The preparation method of the hydrogel includes: firstly, acetalizing and crosslinking polyvinyl alcohol and glutaraldehyde under acidic conditions to obtain a polyvinyl alcohol-glutaraldehyde hydrogel with a three-dimensional network structure; then, immersing it in a solution containing acrylic monomers and the initiator cerium ammonium nitrate, and heating it to allow the acrylic monomers to graft and polymerize onto the backbone, forming a confined grafted network structure. The hydrogel has a freezing temperature as low as -31.58℃, an elongation at break greater than 300% at -30℃, a tensile strength of approximately 5.6 MPa, and an electrical conductivity of approximately 0.03 S / m, and exhibits a stable and sensitive resistance response to tensile strain. This invention does not require the addition of exogenous small molecule antifreeze agents, and can maintain excellent mechanical flexibility, high strength, and stable conductive sensing performance at low temperatures. It is suitable for flexible strain sensors and wearable electronic devices, and has broad application prospects, especially in cold or extreme low-temperature environments.

The application discloses a composite flocculant based on aluminum chloride and a preparation method thereof, and belongs to the technical field of flocculant preparation, and is used for solving the technical problem that the stability and flocculation performance of the flocculant need to be further improved in the prior art; the branched polymer containing polycarboxyl groups is prepared by the reaction of tris(2-aminoethyl)amine and pyromellitic dianhydride, and the taurine groups are introduced to obtain the sulfobranched polycarboxyl polymer; the titanium phosphorus silicon aminopropyl composite is synthesized by using the sol-gel method, and the inorganic-organic network combination is realized; the polyimidazolium-hydroxy ether is obtained by the reaction of imidazole, epichlorohydrin and bisphenol A diglycidyl ether; the composite flocculant is formed by the reaction of the three under the acidic condition, the composite flocculant combines the polycarboxyl groups, the sulfonic acid groups, the imidazolium groups and the inorganic-organic skeleton, has high charge density, good adsorption and bridging performance, can rapidly form stable flocs, and can effectively remove the suspended particles and organic pollutants in water.

The utility model relates to dimethyl sulfoxide storage technical field, specifically is multi -temperature zone dimethyl sulfoxide grading storage device, including the heat preservation bucket, the heat preservation bucket is fixedly sleeved with annular outer heat conduction plate and inner heat conduction plate, the heat preservation bucket, outer heat conduction plate and inner heat conduction plate between respectively form normal temperature area, low temperature area and heat preservation area, the heat preservation bucket top seal has the sealing plate that closes normal temperature area, low temperature area and heat preservation area, and the bottom surface of heat preservation bucket is set up respectively with normal temperature area, low temperature area and heat preservation area one -to -one corresponding inlet pipe and outlet pipe on sealing plate, inlet pipe and outlet pipe are controlled through the valve, the use of the application can make that the stock solution is low temperature area heating, working liquid is properly heat preservation area heating, and heat preservation area is arranged in the middle, effectively avoid the crystallization phenomenon caused by the temperature of heat preservation area too low, can utilize the rotation of inner vertical pipe rotation drive pole to rotate simultaneously, further prevent crystallization recovery liquid crystallization.

The utility model belongs to piece alkali machine technical field, concretely relates to a piece alkali machine with the function of reducing crystallization alkali, including alkali tank, the top fixed coupling of alkali tank has two bearing seats, the inside of each bearing seat is all through bearing installation has the pipe of turning, the pipe of turning between two is commonly fixedly connected with the drum of turning, and the drum of turning is communicated with the pipe of turning and is set up, the top of drum of turning is provided with the current -collecting box, the left and right sides of current -collecting box are commonly fixedly connected with cooling pipe, cooling pipe penetrates pipe of turning and drum of turning and is connected with pipe of turning through sealing bearing. By setting up electric heating rod and temperature sensor in the current -collecting box for cooling water storage, when the water temperature of cooling water is low, the electric heating rod carries out temperature rise to cooling water, inhibits the excessive crystallization of lye on the surface of drum of turning due to the temperature is too low, and is scraped down conveniently by scraper.

This invention relates to the field of water treatment technology and discloses a water softening device based on induced crystallization, including a tank. A filtration and cleaning mechanism for filtering and cleaning crystals is located at the rear end of the tank, and a stirring and cleaning mechanism for cleaning the inner wall of the tank and conveying crystals is located at the front end of the tank. The crystal conveying direction of the stirring and cleaning mechanism is coaxially aligned with the crystal filtration inlet of the filtration and cleaning mechanism, and the stirring speed of the stirring and cleaning mechanism is adapted to the filtration rotation speed of the filtration and cleaning mechanism, achieving continuous crystal conveying and integrated filtration. A flexible reciprocating scraper is installed inside the filter screen to achieve online descaling without stopping the machine, solving the problem of low automation in existing equipment for crystal discharge. A 1:2 meshing ratio between the semi-trapezoidal gear and the trapezoidal gear enables low-speed uniform rotation of the filter tank, preventing crystal seed loss with the filtrate and solving the problem of crystal seed loss in existing equipment.

The utility model provides a novel plug valve, and relates to the technical field of valves. Comprising a valve seat made of PEEK or stainless steel materials, and a cock is arranged in the valve seat. A lining is fixedly nested in the valve seat; the lining is located on the periphery of the rotary plug. A 2507 stainless steel sealing cover is arranged at the upper end of the valve seat; the upper end of the valve rod penetrates through the sealing cover, the middle of the valve rod is in sealing connection with the sealing cover, and the lower end of the valve rod is connected with the cock; and the sealing surface of the sealing cover is made of stellite alloy steel. A cavity is eliminated through the lining, crystal accumulation is avoided, two-way sealing supports any flow direction, materials are resistant to corrosion and high temperature, the problem of urea crystal accumulation in the ammonium carbamate solution environment is avoided, and normal operation of the valve is guaranteed.

The invention discloses a hydrophobic self-cleaning anti-reflection coating liquid and a preparation method thereof, and aims to overcome the defects in the aspects of hydrophobicity, weather resistance and environmental friendliness although an existing anti-reflection film technology can reduce the optical reflectivity. Aiming at the problems, the molecular-level synergistic effect among the components is realized through the following innovative combination, so that the limitation of the traditional technology is broken through: through the unique combination and proportion of chitosan, long-chain alkyl silane and perfluorosilane as well as glutamine and ethyl acetate, 'high anti-reflection (llt), which cannot be realized by a single component, is converted into high anti-reflection (llt), high anti-reflection (llt), high anti-reflection (llt), high anti-reflection (llt), high anti-reflection (llt) and high anti-reflection (llt); 2.5%) + super-hydrophobic (gt; and the trinity performance of environmental protection (formaldehyde-free) is realized.

This utility model relates to the technical field of non-ferrous metal flotation reagent synthesis reaction equipment. It provides a sedimentation-type mineral processing reagent synthesis reactor, including a tank body. A motor is installed at the top of the tank body, and the motor is connected to a stirring shaft via a gear set. The tank body is divided into an upper chamber and a lower chamber by a filter baffle. The side wall of the tank body has a feed port and a discharge port communicating with the upper chamber, and the bottom of the tank body has a slag discharge port communicating with the lower chamber. Heating wires are arranged circumferentially on the inner wall of the upper chamber. The tank body has a heating box for heating the heating wires. The heating wires are sequentially covered with a ceramic layer and an anti-vortex layer. The tank body is divided into a reaction zone in the upper chamber and a sedimentation zone in the lower chamber. The crystals naturally settle into the lower chamber, while the clear liquid remains in the upper chamber. The heating wires arranged circumferentially on the inner wall of the upper chamber, covered with a ceramic layer and an anti-vortex layer, evenly transfer the heat generated by the heating wires to the inner wall of the tank body, changing the material flow direction, reducing the dead zone of stirring, and making the temperature and concentration distribution more uniform.

This invention discloses a high-temperature resistant downhole emulsion explosive and its preparation method, belonging to the field of emulsion explosive technology. The emulsion explosive comprises an aqueous phase material, an oil phase material, and a sensitizer, with a mass ratio of (88-96):(4-12):(0.8-2.0). The aqueous phase material, by mass parts, includes the following raw materials: 70-80 parts ammonium nitrate, 4-6 parts sodium nitrate, 5-8 parts urea, 0.1-0.6 parts chitosan quaternary ammonium salt, and 10-20 parts water. The oil phase material, by mass parts, includes the following raw materials: 50-70 parts composite oil phase and 20-40 parts composite emulsifier, which includes Span80 and polyisobutylene succinimide derivatives. This invention involves adding the aqueous phase material to the oil phase material, adding the sensitizer to the emulsion matrix formed by emulsification, and stirring to prepare the emulsion explosive. The emulsion explosive provided by this invention is suitable for use in deep well high-temperature environments and exhibits good high-temperature stability.

This utility model discloses a three-way flushing shut-off valve for an ammonia-carbon analyzer, comprising a valve body, a main valve core, and a three-way flow channel disposed within the valve body, each communicating with a medium inlet flow channel and two medium outlet flow channels respectively. A main valve seat is provided on the flow channel communicating with the medium inlet flow channel. The lower valve head of the main valve core is located in the main valve seat, and its upper end passes through the upper valve cover and connects to the main actuator. Secondary valve assemblies for connecting to manual control mechanisms are provided on the flow channels communicating with the two medium outlet flow channels respectively. The medium inlet flow channel is mounted on the lower valve body, and a guide hole communicating with the medium inlet flow channel is opened at the top of the lower valve body. A hollow guide post with a flow channel hole is provided at the lower end of the valve head of the main valve core, slidingly engaging with the guide hole. The lower valve body and the upper valve cover are detachably connected to the valve body via bolts and nuts. This utility model features a simple structure, easy disassembly, easy maintenance, good sealing effect, smooth valve operation, and long-term safe online operation.

The invention discloses an imrecoxib solid preparation and a preparation method thereof, and belongs to the technical field of pharmaceutical preparations, the solid preparation comprises the following components by mass: 15-25% of imrecoxib, 10-40% of pea maltodextrin, 10-40% of Soluplus, 1-3% of poloxamer, 10-30% of a filler, 10-20% of a disintegrating agent, 0.8-1.2% of a flow aid and 0.8-1.2% of a lubricant. Through synergistic interaction of triple carriers, Soluplus inhibits drug crystallization by means of hydrogen bonds and promotes dispersion; the poloxamer reduces the surface tension and improves the dispersity and the dissolution rate; the pea maltodextrin plays an anti-oxidation role, improves the sphericity, fluidity and stability of the particles, and is low in cost. Aiming at the difficulties that imrecoxib is low in solubility, easy to oxidize and the like, medicine dissolution is remarkably improved, related substances are more stable, and both process robustness and cost control are considered.

This invention proposes a fully electro-melting vertical kiln basalt fiber melting channel, including an electro-melting control system and a furnace body. The furnace body, from one end to the other, sequentially includes a melting zone, a clarification and homogenization zone, and a working zone. The bottom surfaces of the melting zone and the clarification and homogenization zone are at the same height, while the bottom surface of the working zone is located above the bottom surface of the clarification and homogenization zone. The volume of the working zone is smaller than that of the clarification and homogenization zone, which in turn is smaller than that of the melting zone. A spinneret for fiber drawing is provided on the bottom surface of the working zone. Electrodes are respectively installed in the melting zone, the clarification and homogenization zone, and the working zone, and each electrode in each zone is connected to one of the electro-melting control systems. This invention can reduce production energy consumption, improve production efficiency, enhance the processing effect of basalt melt, and ensure product quality.

The invention provides a urea tank and a vehicle with the same, and relates to the technical field of vehicle tail gas treatment. The urea tank comprises a shell, the shell is provided with a containing cavity, and the containing cavity is used for storing urea liquid; the filtering assembly at least comprises a base and a filter, the base is connected with the shell, the filter at least comprises a filter shell, the filter shell is connected with the base, a filtering cavity is defined by the filter shell, and the filtering cavity is communicated with the containing cavity; the cooling assembly comprises a cooling pipeline and an inner cavity shell, the inner cavity shell is connected with the filter shell, the inner cavity shell extends in the circumferential direction of the filter shell, a filtering inner cavity is defined by the inner circle side of the inner cavity shell, a cooling cavity is defined by the outer circle side of the inner cavity shell and the filter shell, and the cooling pipeline extends into the containing cavity; one end of the cooling pipeline communicates with the cooling cavity, and the other end of the cooling pipeline communicates with engine cooling liquid. The problems that in a urea supply module, urea liquid cooling starting unfreezing efficiency is low, and reliability is poor are solved.

The application discloses a polyphenyl-substituted adamantane derivative monomolecular resin represented by formula IA and a preparation method and application thereof. The polyphenyl-substituted adamantane derivative monomolecular resin has good solubility in various polar solvents, is suitable for being made into a film, has a high decomposition temperature, and can well meet the requirements of a photoetching process.

The application discloses a kind of low corrosion low temperature resistant ship water film forming foam extinguishing agent and preparation method thereof.The extinguishing agent is made of deionized water, 1,2-propanediol, sodium lignosulfonate, alkyl polyglycoside, polyether modified heptamethyltrisiloxane, sodium molybdate dihydrate, methyl benzotriazole, xanthan gum and triethanolamine.In the system, sodium molybdate dihydrate and sodium lignosulfonate are coordinated and crosslinked to form a three-dimensional skeleton under the buffer of triethanolamine, and the hydrophobic segment of the surfactant is intercalated and anchored in the hydrophobic microzone inside the skeleton.During preparation, 1,2-propanediol is used to pre-disperse polymer powder, the crosslinking rate is controlled by adding triethanolamine in batches, and the surfactant is added after the system is cooled to complete the cold intercalation.The application limits the self-aggregation and precipitation of surfactant at low temperature, avoids the problem of polymer water core and excessive crosslinking, maintains the stability of rheology, and effectively reduces the corrosion of ship metal equipment.

The invention discloses a preparation method of 3 ', 4', 5 '-trifluoro-2-aminobiphenyl. A reactant I and a reactant II are used, a black phosphorus-palladium-carbon nitride ternary composite catalyst BPQDs-Pd-C3N4 is used as a bifunctional catalyst for coupling and hydrogenation, and an alcohol-water system is used as a common solvent; the preparation method comprises the following steps: adding a black phosphorus-palladium-carbon nitride ternary composite catalyst BPQDs-Pd-C3N4 into a reaction kettle, carrying out coupling in the same reaction kettle, switching to introduce H2 for hydrogenation, filtering and recovering the catalyst after the reaction is finished, concentrating the filtrate, and crystallizing to obtain 3 ', 4', 5 '-trifluoro-2-aminobiphenyl, and realizing the one-pot preparation of 3', 4 ', 5'-trifluoro-2-aminobiphenyl by adopting the prepared black phosphorus-palladium-carbon nitride ternary composite catalyst BPQDs-Pd-C3N4. Suzuki coupling and nitro hydrogenation are sequentially completed in the same reaction kettle, an intermediate does not need to be separated, the operation steps are simplified from two-pot two-filtration and solvent replacement to one-pot one-filtration, and the unit consumption of a solvent and the dosage of a catalyst are reduced by more than half.

The utility model discloses a kind of topological surface corrugated air conditioner high-efficiency heat exchange evaporation pipes, including evaporation pipe body, the evaporation pipe body is provided with core pipe, the outside of core pipe is fixedly wrapped with heat shrink tube, topological surface is opened in the circumferential inner wall of evaporation pipe body, the inner annular surface of evaporation pipe body is fixedly provided with baffling mechanism. The topological surface corrugated air conditioner high-efficiency heat exchange evaporation pipe, hot medium impact on the narrow part of baffle block, the beam medium is divided into three groups, in turn through baffle block, and pass through multiple groups of baffle block and carry out turbulence blocking, the baffle block of isosceles trapezoidal will main stream be divided into upper center flow, wall flow and lateral flow, form complex vortex system structure behind baffle block, significantly enhance radial mixing;Shunting effect makes fluid constantly scour wall surface, destroy thermal boundary layer, reduce thermal resistance;When fluid passes through multiple groups of baffle block in turn, form disturbance, recovery and again disturbance cycle.

The utility model relates to sulfonic acid sodium sampling technical field discloses a kind of sulfonic acid sodium generation online sampling device, including reaction kettle, the inside of the reaction kettle is provided with sampling cylinder, the inside of the sampling cylinder is provided with sampling pipe, the outer wall of the sampling pipe is fixedly connected with sampling valve, the outer wall of the sampling valve is fixedly connected with fixed seat, the inside of the fixed seat is fixedly connected with fixed block, the inside of the fixed block is slidably connected with slide bar, the outer wall of the slide bar is fixedly connected with convex block, the outer wall of the convex block is slidably connected with connecting plate, the inside of the connecting plate is fixedly connected with support shaft. In the utility model, through the cooperation between fixed block, slide bar, convex block, connecting plate, support shaft and convex frame, only need to press slide bar to install and dismount fixed seat and whole sampling structure, it is convenient to maintain whole sampling structure, and whole sampling structure can be completely cleaned in offline state, prevent scale.

The application relates to a wet preparation device, a wet preparation system and a solar cell manufacturing production line. The wet preparation device comprises a wet machine table having a preparation tank, an inlet and outlet opening communicated with the preparation tank and used for feeding and discharging the cell piece on the top surface of the wet machine table, and two cover plates arranged along the width direction of the wet machine table and connected with the wet machine table, the two cover plates are matched and used for jointly opening or closing the inlet and outlet opening, the top surface of the cover plate is configured to gradually descend along the width direction of the wet machine table and from the center of the wet machine table to the edge direction of the wet machine table when the cover plate closes the inlet and outlet opening, and a flow channel for circulating hot water is formed in the cover plate. The wet preparation device, the wet preparation system and the solar cell manufacturing production line provided by the application can reduce the formation of crystals.

The invention discloses an integrated device for efficient concentration and solvent recovery of tetraacetyl ribose, and relates to the technical field of medicine manufacturing, heat conduction temperature control tanks are symmetrically mounted at the top end of a supporting and clamping double-layer frame, and a bottom arc circulating guide tank is clamped to the position, close to the heat conduction temperature control tanks, of the top end of the supporting and clamping double-layer frame; wherein an impurity control bottom arc treatment tank is connected to the inner side of one bottom arc circulating guide tank in a clamped mode, a nucleus blocking bottom arc treatment tank is connected to the inner side of the other bottom arc circulating guide tank in a clamped mode, and the side ends of the multiple exhaust clamping pipes are connected with a relay steam collecting tank in a penetrating mode. The condition that crystallization is conducted while concentration is conducted due to the fact that crystal nucleuses are generated is avoided, the stability of the treatment environment is improved by means of multi-section air pressure control and cooperation of condensation degassing pressure control and solvent recovery synchronous operation, the condition that the evaporation concentration speed is reduced due to temperature and pressure is avoided, and synchronous recovery treatment is conducted on the solvent while the concentration efficiency is improved.

This invention discloses an organic waste gas RTO regenerative thermal oxidation treatment device and method for waterproof membrane production in the field of waste gas treatment technology. It includes an annular heat storage block, a combustion chamber, an external drive mechanism, an external membrane production machine, an external waste gas emission mechanism, an external waste gas storage machine, and an airflow distribution chamber. The waste gas emission mechanism is connected to both the waste gas storage machine and the airflow distribution chamber. Based on the rate at which the waste gas is generated by the membrane production machine, this invention selects whether to treat the waste gas directly or to store a certain amount of waste gas before treatment, reducing wear and tear on the waste gas storage machine, minimizing waste gas leakage, and increasing treatment efficiency. Furthermore, the annular heat storage block circulates through waste gas, air, and tail gas, enabling this invention to complete the heat storage-recirculation-preheating cycle within a single heat storage chamber, avoiding repeated valve switching, reducing process complexity, and improving process stability.

The invention discloses a segmented cooling system and method for evaporating and crystallizing fly ash water washing liquid to obtain sylvite, and belongs to the field of fly ash water washing liquid treatment. The system comprises a pretreatment and evaporation sodium separation unit, a vacuum flash evaporation cooling unit, an indirect heat exchange cooling crystallization unit and a separation drying unit which are in fluid communication in sequence, the vacuum flash evaporation cooling unit adopts a structure without a heat exchange wall surface and is matched with a condensation system capable of recycling heat energy; and the indirect heat exchange cooling crystallization unit is matched with a forced circulation and external heat exchange structure. According to the method, a segmented process of vacuum flash evaporation precooling and indirect heat exchange deep cooling is adopted, firstly, the potassium-rich mother liquor at the temperature of 100-110 DEG C is cooled to 55-65 DEG C through vacuum flash evaporation, and then is cooled to 20-30 DEG C through indirect heat exchange, so that potassium chloride is fully crystallized. According to the method, the energy consumption of a vacuum system can be reduced by 30-50%, scaling of a high-temperature section is eradicated fundamentally, the product purity is guaranteed to reach 90% or above through a flash evaporation precipitation-cooling redissolution self-purification mechanism, and efficient, low-consumption and long-period stable recovery of potassium chloride in the fly ash water washing liquid is achieved.

This utility model discloses an anti-crystallization shut-off valve, relating to the field of shut-off valve technology. The utility model includes an inlet pipe, a valve pipe, and a valve plug pipe. The lower end of the inlet pipe is connected to an inlet branch pipe, and the upper end of the inlet pipe is threaded with a valve seat. The lower end of the valve pipe is fixedly connected to the upper end of the inlet pipe. The valve plug pipe is vertically slidably sleeved inside the valve pipe. The lower end of the valve pipe is connected to an outlet branch pipe, and a conical valve plug is fixedly installed at the lower end of the valve plug pipe. This utility model connects the inlet branch pipe at one end of the inlet pipe and the outlet branch pipe on one side of the valve pipe to the pipeline. By moving the valve plug pipe downwards, the valve seat is blocked, closing the valve and eliminating dead zones within the valve pipe, thus preventing liquid accumulation and crystallization that could block the valve. By placing the conical valve plug inside the valve seat, when the valve is opened, the valve plug pipe rises, the valve plug leaves the valve seat, and the liquid in the inlet pipe flushes the valve plug, preventing the liquid from forming a structure around the valve plug.

The utility model belongs to the field of valves, and particularly relates to a reaction kettle jacket heat preservation upward expansion valve which comprises a valve body, the lower portion of the valve body is a vertical section, and the upper portion of the valve body is an inclined section. An end cover is arranged below the valve body, and a valve seat is clamped between the valve body and the end cover; a valve rod penetrates through the center of an opening of the valve body, the bottom of the valve rod is connected with a valve element for blocking the opening, and the upper portion of the valve rod is connected to an executing mechanism. The heating mechanism comprises a heat preservation jacket arranged on the outer wall of the valve body in a sleeving mode, and a steam inlet end base is installed on the inclined section of the valve body. The steam inlet end seat is arranged on the inclined section of the valve body, the steam outlet end seat is arranged on the vertical section, and the steam inlet end seat and the steam outlet end seat are distributed diagonally, so that steam enters from the steam inlet end seat and then enters the steam outlet end seat along a channel of the valve body to heat the inner wall of the channel of the valve body. The conveyed medium is prevented from crystallizing on the inner wall of the valve body, and smooth medium conveying is guaranteed.

The utility model relates to a liquid injection device, which relates to the technical field of battery manufacturing, and comprises a liquid injection main body, a liquid injection device and a liquid injection device, the elastic reset piece is connected with the liquid injection needle; the sealing assembly comprises a sealing cover and a sleeve arranged outside the liquid injection main body in a sleeving mode, the sleeve is provided with a liquid outlet, and the sealing cover is in linkage with the liquid injection needle through a connecting piece; during liquid injection, the liquid injection needle drives the connecting piece and the sealing cover to move, the liquid outlet is opened, and the sealing cover and the connecting piece form a flow guide blocking structure, so that liquid flowing out of the liquid injection needle flows out all around; and after finishing, the elastic reset piece drives the liquid injection needle to reset, and the sealing cover and the liquid outlet are closed to form sealing. By optimizing the design of the liquid injection needle and the sealing assembly, the electrolyte can be accurately guided to flow to a target area, splashing and dripping are prevented, and the corrosion risk of a battery assembly is reduced; the elastic reset piece achieves the automatic reset function, the production efficiency and the automation level are improved, meanwhile, the equipment cost is reduced, and the production process is simplified.

The utility model provides wet etching equipment for wafers and a feeding system of the wet etching equipment. The feeding system comprises a mixing device and a liquid silicon dioxide supply part, the mixing device comprises a mixed liquid storage part and a circulating mechanism; the mixed liquid storage part is connected with the liquid silicon dioxide supply part; the circulating mechanism comprises a circulating pipeline and a first pump, two ends of the circulating pipeline are respectively communicated with the mixed liquid storage part, and the first pump is arranged on the circulating pipeline. The mixed liquid storage part is used for accommodating a phosphoric acid solution and receiving liquid silicon dioxide from the liquid silicon dioxide supply part, and the liquid silicon dioxide and the phosphoric acid solution are uniformly mixed under the action of the first pump to form a uniform silicon dioxide-phosphoric acid solution. The feeding system is applied to the wet etching equipment for wafers so as to carry out acid exchange operation on the wet etching equipment, and the change of the etching rate and the selection ratio of SIN / SiO2 caused by the great reduction of the concentration of silicon ions in an etching tank due to acid exchange can be avoided.