9 results about "Temperature and pressure" patented technology

The invention provides a method of forming a dense, shaped article, such as a crucible, formed of a refractory material, the method comprising the steps of placing a refractory material having a melting point of at least about 2900° C. in a mold configured to form the powder into an approximation of the desired shape. The mold containing the powder is treated at a temperature and pressure sufficient to form a shape-sustaining molded powder that conforms to the shape of the mold, wherein the treating step involves sintering or isostatic pressing. The shape-sustaining molded powder can be machined into the final desired shap and then sintered at a temperature and for a time sufficient to produce a dense, shaped article having a density of greater than about 90% and very low open porosity. Preferred refractory materials include tantalum carbide and niobium carbide.

The invention discloses a method for preparing high-resilience thermoplastic polyurethane foamed particles and a molded body thereof. Thermoplastic polyurethane particles are placed in an autoclave, injected high-pressure mixed fluid is one or two of CO2, N2, HFC and HCFC, one or two of chloroform, ethanol, methanol, acetone, anone, butanone, pyridine, N-methyl pyrrolidone, N,N-dimethylformamide and N,N-dimethyl acetamide serve as an organic cosolvent, and the high-pressure mixed fluid is enabled to be in a saturated state in the thermoplastic polyurethane particles and then is placed in hot air for foaming, thereby obtaining the thermoplastic polyurethane foamed particles, of which foamed pore structures are uniform and are closed-pore structures. The thermoplastic polyurethane foamed particle molded body, which is light in weight, high in resilience and controllable in shape size and has good mechanical properties, can be obtained through injecting the thermoplastic polyurethane foamed particles in a mold and adjusting mold pressing temperature and pressure so as to soften heated surfaces of the foamed particles.

The invention discloses a room-temperature preparation method of a metal-organic framework material preferentially adsorbing ethane. The preparation method comprises the following steps: dispersing zinc oxide and copper tetrafluoroborate hexahydrate in water and ethanol; dispersing quinoline-5-carboxylic acid in N,N-dimethylformamide; mixing the former solutions, and stirring an obtained mixed solution at room temperature; filtering the stirred solution to obtain a solid product, purifying, drying and performing vacuum activation to obtain the metal-organic framework material preferentially adsorbing the ethane. By the room-temperature preparation method, the metal-organic framework material with good alkane selectivity is prepared at room temperature, the synthesizing energy consumption of the material is reduced, and the prepared material has good adsorptive separation performance for ethylene-ethane gas at normal temperature and pressure. The material can preferentially adsorb the ethane from the ethylene-ethane mixed gas; in addition, the material has good water vapor stability, and still has a good crystal structure after 40-day direct exposure to air.

The invention relates to a manufacturing method of a rare earth metal PrNd rotary target. The manufacturing method comprises the following steps: preparing rare earth metal PrNd powder, the average grain size D50 of which is 40-70[mu]m, by means of a hydrogenation dehydrogenization method-crushing method; in a protective atmosphere, filling a graphite mold of a vacuum hot pressing sintering furnace with the powder; in the protective atmosphere, carrying out hot press molding to obtain a rare earth metal PrNd target blank, wherein the hot pressing temperature is 760-900 DEG C and the molding pressure is 19-30MPa, and maintaining the temperature and pressure for 1-2 h; and machining the molded target and welding a copper or stainless steel back target. The target provided by the invention isused for improving the magnetic performance of a NdFeB magnet by grain boundary diffusion PrNd, the use level of rare earth elements can be reduced greatly, and the manufacturing cost of the high performance NdFeB magnet is saved.

The invention discloses a fiber grating sensor capable of measuring temperature and pressure simultaneously and a measurement method. The sensor comprises a thin-walled cylinder with an opening at thebottom, and a protective shell enclosed outside the thin-walled cylinder, wherein a gap exists between the thin-walled cylinder and the protective shell; and a first fiber grating and a second fibergrating are fixed on the outer surface of the thin-walled cylinder, fiber pigtails of the first and second fiber gratings penetrate through the top of the protective shell, the cross section of the thin-walled cylinder is an elliptical shape defined by two straight edges and two semicircular arcs respectively connected to two ends of the two straight edges, the first fiber grating is fixed at thecenter of the surface of the straight edge of the thin-walled cylinder along the axis direction of the thin-walled cylinder, the second fiber grating is fixed at the center of the surface of the semicircular arc of the thin-walled cylinder along the axis direction of the thin-walled cylinder, and the centers of the first and second fiber gratings are at the same height as the center of the thin-walled cylinder. The sensor disclosed by the invention has the characteristics of novel structure, high sensitivity, reliable measurement result, and wide application.

The invention discloses a temperature and pressure reducing valve which comprises a valve body, a temperature reducing water device is arranged at the bottom of the valve body, and a silencer is arranged at the position, located above the temperature reducing water device, in the valve body. According to the temperature and pressure reducing valve, the operating force of a valve rod and an executing mechanism is remarkably reduced through a pre-starting type balance valve element structure, the fault rate of the valve rod and the executing mechanism is reduced, the valve can be rapidly opened to guarantee the safety of a main system, and the pre-starting type balance valve element structure guarantees the sealing effect of the whole valve through two sealing pairs. Zero leakage after the valve is closed is achieved, the safety problem that the temperature behind the valve is high due to inner leakage of the valve is solved, inner leakage of the valve is avoided, the steam utilization rate is increased, temperature reduction water feeding is reduced, and the unit operation economical efficiency is effectively improved. Internal leakage of the valve is avoided, erosion of a silencer and the temperature reducing water device under the condition that steam flows abnormally is reduced, the reliability of the whole valve is improved, and the service life of the whole valve is prolonged.

The invention discloses a municipal fuel gas flow pressure monitoring system, belongs to the technical field of gas monitoring. The system comprises a flowmeter and an anti-explosion heat preservationbox, the upper part of the right side wall of the flowmeter is connected with a temperature change sensor through threads, the left end of the rear side wall of the inner cavity of the anti-explosionheat preservation box is fixedly provided with a three-valve set through bolts, the upper portion of the three-valve set is connected with a differential pressure transmitter through threads, the right side of the lower part of the three-valve set is connected with a pressure transmitter through threads, a flow accumulating instrument is fixedly arranged on the upper portion of the rear side wallof the inner cavity of the anti-explosion heat preservation box through bolts, and the lower portion of the rear side wall of the inner cavity of the anti-explosion heat preservation box is fixedly provided with a storage battery set through bolts. According to the municipal fuel gas flow pressure monitoring system, the design is reasonable, the practicability is high, the differential pressure transmitter and the pressure transmitter are additionally arranged on the pipeline and used for compensating the temperature and the pressure, the measurement precision is improved, and the influence on monitoring caused by environmental changes is avoided.

The invention belongs to the technical field of design of gas supply systems of a tester, and relates to a rapid adjusting device for temperature and pressure of pipe network gas supply. The device comprises a supply proportion distribution valve, a heating device, a mixer and gas guiding pipelines, wherein the supply proportion distribution valve is used for distributing the gas supply amount ofa gas source to a first pipeline and a second pipeline; the heating device is arranged on the second pipeline; an inlet end of the mixer is connected with an outlet of the first pipeline and an outletof the second pipeline correspondingly, and is used for mixing cold air with hot air, and then outputting the mixture to a rectification and pressure stabilization device; and the plurality of gas guiding pipelines are arranged on the rectification and pressure stabilization device and are connected to an exhaust pipe after summarizing, and the exhaust pipe is provided with a pressure adjusting valve. According to the rapid adjusting device for the temperature and the pressure of the pipe network gas supply, the rapid adjustment of the temperature is realized through the heating device and the mixer, the rapid adjustment of the outlet pressure is realized through the plurality of gas guiding pipelines and a pressure adjusting valve, so that the temperature, the pressure and the flow of the rectification and pressure stabilization device are ensured to meet the requirements of a test piece; and according to the rapid adjusting device, the rapid pressure relief can be realized, and thesafety of equipment and the test piece can be ensured.