11results about How to "Slow down the spread" patented technology

The application discloses a hot water boiler based on a porous medium burner, which comprises a hot water boiler shell, wherein the hot water boiler shell comprises a boiler barrel, the outer side of the boiler barrel is provided with a water jacket for storing water, and the inside of the boiler barrel is fixedly provided with a porous medium burner; the inner cavity of the porous medium burner comprises a combustion reaction zone, the two ends of the combustion reaction zone are provided with anti-backfire areas, the two ends of the porous medium burner are provided with mixed gas inlets, the mixed gas inlets are connected with mixed gas input pipelines, one end of the mixed gas input pipelines extends out of the hot water boiler shell and is connected with a gas fuel supply device; the porous medium burner is internally provided with an ignition device, mixed gas flows into the combustion reaction zone from the mixed gas input pipelines and is ignited by the ignition device, heat generated by combustion of the mixed gas heats water in the water jacket, flue gas is discharged from the combustion reaction zone through the pores of the porous medium of the porous medium burner and is discharged into a flue gas treatment mechanism connected with the hot water boiler shell, the gas utilization rate is improved, and the heat diffusion speed is slowed down.

The utility model relates to the technical field of cable manufacturing, and discloses a double-layer co-extrusion sheath cable which comprises a conductor, a conductor shielding layer, a crosslinked polyethylene insulating layer, an insulation shielding layer, a semi-conductive water-blocking tape, a soft round copper wire, a soft pure copper tape, a non-conductive water-blocking tape and a CPP tape from inside to outside. According to the double-layer co-extrusion sheath cable, the inner sheath layer and the outer sheath layer are arranged, the inner sheath layer is made of the flame-retardant PVC material with the oxygen index larger than or equal to 32%, a carbonization layer can be rapidly formed under the condition of high temperature or open fire, oxygen is effectively isolated, flame-retardant gas is released, and flame is prevented from spreading towards the interior of the cable, and the outer sheath layer is made of the high-hardness MDPE material. Although the flame retardance is general, the flame diffusion speed can be slowed down, and through the synergistic effect with the inner layer PVC, the overall flame retardant grade of the cable reaches the V-0 grade (UL 94 standard), the high-flame-retardant scene requirement is met, and the flame retardant property is further remarkably improved.

The present application belongs to the technical field of fruit tree disease prevention and control, and particularly relates to a method for removing sporadic citrus Huanglongbing trees in citrus orchards. According to the epidemiological characteristics of citrus Huanglongbing, the control strategy of 'completely removing diseased plants, strictly preventing and controlling citrus psyllids, and comprehensively preventing and controlling' is implemented at sporadic disease points in the diffusion front area. The sporadic disease point orchards are promptly cleaned of diseased trees, and the diffusion front area is comprehensively prevented and controlled to prevent the disease from occurring again. In this way, disease information and risk warnings can be promptly released, the removal of diseased trees and the strict prevention and control of citrus psyllids can be achieved, the invasion and reproduction of exogenous psyllids can be hindered, the risk of healthy seedlings getting sick can be reduced, and the spread of citrus Huanglongbing can be blocked. The present application provides technical support for delaying the further spread of citrus Huanglongbing and saves human and material resources.

This utility model relates to the field of gas filling protection technology and discloses an automatic gas filling protection device, including an equipment frame, an equipment frame fixedly installed on the upper part of the equipment frame, a hydraulic rod fixedly installed on the upper surface of the equipment frame, a lifting plate fixedly installed at the lower end of the hydraulic rod, a gas pipe installed at the lower part of the lifting plate, an installation plate installed on the rear side of the equipment frame, a lead screw rotatably installed on the inner wall of the installation plate, a moving block threaded on the outer side of the lead screw, a motor fixedly installed on the upper part of the installation plate, a connecting block fixedly installed on the outer side of the moving block, a protective cover fixedly installed on the outer side of the connecting block, and a bottom clamping plate fixedly installed in the inner middle layer of the equipment frame. This device can prevent accidents involving gas cylinders. In the event of a gas cylinder explosion, it can effectively block or buffer the impact force of fragments, limiting the scope of the hazard. Simultaneously, the protective cover can slow down the diffusion rate of leaked gas, buying time for operators to evacuate or handle emergencies.

The application discloses a preparation method of magnesium sulfide / MXene composite material, and products and applications thereof. Lithium halide is added into strong acid to dissolve Ti3AlC2 powder, and the treated Ti3AlC2 powder is collected when the pH value is 6 after washing, centrifugation, vacuum drying, ultrasonic bath and centrifugation. The green supernatant is collected to obtain a layered MXene colloidal suspension. The MXene dispersion liquid and oleylamine are stirred to form an emulsion. The mixed dispersion is heated to form Mg-O-X / MXene. A solution containing thioacetamide in oleylamine is injected into the three-necked bottle. After heating, stirring, cooling, washing, centrifugation and freeze drying, the magnesium sulfide / MXene composite material is obtained. The first discharge specific capacity of the magnesium sulfide / MXene composite material is 199.7 mAh / g at a current density of 500 mA / g, and the discharge specific capacity is 187 mAh / g after 50 cycles, and the capacity retention rate is 93.6%.

The utility model discloses an inorganic cloth fireproof roller shutter, which is characterized in that a drain pipe is arranged below a roller shutter structure, and a plurality of spray heads are uniformly arranged on the lower side of the drain pipe along the direction of a notch, so that a water spray system can be started at the first time when a fire disaster or toxic smog occurs; water mist sprayed by the spray heads quickly forms a continuous water curtain barrier in front of the roller shutter. The water curtain not only has a physical isolation effect, but also can effectively capture and cool high-temperature smoke and harmful particles, obviously reduce the concentration and diffusion speed of smoke, and prevent the smoke from spreading from a fire disaster area to other safe areas. Compared with a traditional dry type fireproof roller shutter, the structure improves the smoke prevention performance, and the flowing path of smoke in a building in the initial stage of a fire disaster can be controlled easily.

The invention discloses a concave permanent magnet structure, which belongs to the technical field of vacuum electronics, solves the technical problems of surface damage and plasma generation of a permanent magnet anode in a zero field region, is in a circular ring shape, and comprises an axial leftward magnetized magnetic block, an axial rightward magnetized magnetic block and a radial circle center magnetized magnetic block. The radial magnetizing magnetic block towards the circle center is a circular ring with a step which is located on the right side of the inner ring. And the axially leftward magnetized magnetic block and the axially rightward magnetized magnetic block are positioned in the step. An interval groove is formed between the axially leftward magnetized magnetic block and the axially rightward magnetized magnetic block, and the ratio of the axial width to the radial depth of the inner ring of the interval groove is 35%-55%. The magnetization direction of the axial leftward magnetization magnetic block is leftward in the axial direction, the magnetization direction of the axial rightward magnetization magnetic block is rightward in the axial direction, and the magnetization direction of the radial circle center magnetization magnetic block is towards the circle center in the radial direction. The device is used for inhibiting plasma generation in a null field region in a permanent magnet structure and charged particle backflow caused by the plasma generation.

The utility model relates to the technical field of induction smelting furnaces, in particular to a vacuum induction directional zone smelting furnace which comprises a smelting furnace body, and a dustproof assembly is installed on the top of the smelting furnace body. The dustproof assembly comprises a longitudinal frame fixedly connected with the smelting furnace body, air holes penetrating through the longitudinal frame are formed in the two sides of the longitudinal frame correspondingly, a water storage tank is fixedly connected to the bottom of the inner side of the longitudinal frame, a heat dissipation assembly is installed at the top of the water storage tank, and a retarding assembly is installed on the side, close to the smelting furnace body, of the longitudinal frame. The heat dissipation assembly comprises an outer pipe fixedly connected with the water storage tank, a metal hollow column with one end movably extending to the outside of the outer pipe is arranged in the outer pipe, and an elastic rope is fixedly connected between the top of the metal hollow column and the longitudinal frame. The technical problems that according to an existing induction smelting furnace, it is difficult to stop dust from getting close to the smelting furnace without dead corners through the air pressure difference, dust around the smelting furnace is cleaned away at the slow air flowing speed, and the speed of heat diffusing around is decreased when the smelting furnace is opened are solved.

The invention belongs to the technical field of oil exploitation, and particularly relates to an oil-based foam oil displacement system based on stability augmentation of high-temperature-resistant nano-particles and a preparation method and application thereof.The stability augmentation oil-based foam oil displacement system is characterized in that 0.5 wt%-1.5 wt% of nano-particles, 0.5 wt%-2 wt% of a nonionic surfactant Span20 and 0.1 wt%-1.0 wt% of a nonionic surfactant JQ-1 are adopted, the half-life period of foam drainage can be 15-22 min under the conditions that the pressure is 1 MPa and the temperature is 100 DEG C, and the stability augmentation oil-based foam oil displacement system is stable. And the half-life period of foam is 9-15 days. The stability-enhancing oil-based foam oil displacement system based on the high-temperature-resistant nano-particles is high in foaming capacity in an oil solvent, the surface tension of the oil solvent can be remarkably reduced, high foaming performance and foam stability are achieved, and the preparation process is simple, green and environmentally friendly.

The application relates to the technical field of agricultural greenhouses, in particular to a ventilation device for an agricultural greenhouse, which comprises a wind guide pipe, a rectifier pipe, a first electromagnet and a second electromagnet, a plurality of one-way valves are uniformly arranged on the lower part of the side wall of the wind guide pipe in a circumferential direction, when the one-way valves are opened, the gas in the rectifier pipe enters the wind guide pipe through the one-way valves; the openings at the two ends of the rectifier pipe are provided with radially inwardly extending reduced-diameter parts, the inner side of the reduced-diameter parts is in sealing cooperation with the outer side of the wind guide pipe; the first electromagnet is fixedly connected to the upper part of the inner side of the rectifier pipe, the second electromagnet is located below the first electromagnet; the outer side of the second electromagnet is in sliding cooperation with the inner side of the rectifier pipe, the inner side of the second electromagnet is in sliding gap cooperation with the outer side of the wind guide pipe; the second electromagnet and the rectifier pipe are connected with a reset spring. The device can realize air convection in the greenhouse, reduce the air flow speed, reduce energy consumption and avoid crop damage.

The utility model belongs to the production technical field of quartz crucible, concretely relates to a kind of forming mould of quartz crucible, it includes mould body, water jacket and partition, the partition is arranged between the mould body and the water jacket, the inside of partition in it and the outside of mould body form the first cavity, partition outside and the inside of water jacket form the second cavity, first cavity top and the second cavity top are communicated and the second cavity bottom is connected with the evacuation device outside the clamping cavity.In the process of forming mould evacuation, because the opening and side wall of mould body located in first cavity are closer to the evacuation port located in second cavity bottom compared with mould body bottom, the opening and side wall of mould body have better evacuation effect, so that the transparent layer of the opening and side wall of prepared quartz crucible has higher density.