99 results about "1,1,1,2,3,3,3-Heptafluoropropane" patented technology

A pharmaceutical aerosol formulation comprising particles of (a) formoterol or a pharmaceutically acceptable salt, solvate or physiologically functional derivative thereof and (b) mometasone or a pharmaceutically acceptable salt, solvate, or physiologically functional derivative, thereof dispersed in a propellant selected from the group consisting of 1,1,1,2-tetrafluoroethane, 1,1,1,2,3,3,3-heptafluoropropane and a mixture thereof, and a bulking agent having a mass median diameter of less than one micron.

The invention provides a Ca-Fe alloy and an Al-Ca-Fe alloy for deoxidation of steel making and also provides a method for smelting the Ca-Fe alloy and the Al-Ca-Fe alloy by a flame retardant mixed protective gas method. The Ca-Fe alloy contains 20-60 mass percent of Ca and the balance of Fe and inevitable impurities. The Al-Ca-Fe alloy contains 15-50 percent of Al, 10-60 percent of Ca and the balance of Fe and inevitable impurities. But the contents of the Al and Ca are adjusted within the range that Al / Ca is not equal to 1-2, and Ca / Al is not equal to 1.3-1.5. The protective gas contains 0.01-5 volume percent of 1, 1, 1, 2, 3, 3, 3-heptafluoro-propane or 1, 1, 1, 2-tetrafluoroethane and the balance of one or more of N2, CO2, Ar gas and compressed air. The Ca-Fe alloy and the Al-Ca-Fe alloy have good effect when used for deoxidation of steel making, and the quality of steel is improved. The Ca-Fe alloy and the Al-Ca-Fe alloy produced by the flame retardant mixed protective gas can increase the Ca content in the alloy and reduce Ca burning loss, and has remarkable economic benefit and social benefit.

The present invention discloses a local submerged gas fire extinguishing device in an electronic distribution transforming cabinet. The device comprises a direct type fire detecting and fire extinguishing apparatus or an indirect type fire detecting and fire extinguishing apparatus, wherein the direct type fire detecting and fire extinguishing apparatus is divided into a carbon dioxide direct type fire detecting and fire extinguishing apparatus and a heptafluoropropane direct type fire detecting and fire extinguishing apparatus, the indirect type fire detecting and fire extinguishing apparatus is divided into a carbon dioxide indirect type fire detecting and fire extinguishing apparatus and a heptafluoropropane indirect type fire detecting and fire extinguishing apparatus. According to the device, a fire extinguishing agent container bottle filled with a fire extinguishing agent, a container valve and a fire detecting tube capable of fire extinguishing agent releasing or a releasing tube are combined into the fire extinguishing device; the fire detecting tube prepared from a non-metal soft substance material has characteristics of effective temperature susceptibility, softness and long time leakage resistance, and the like; during the using process, the fire detecting tube is placed on the position close to or above a part of the electronic distribution transforming cabinet positioned on a place, wherein the fire source is generated most possibly on the place; once the fire is generated, the position of the fire detecting tube is softened and broken, wherein the position of the fire detecting tube is subjected to the highest temperature; the gas for fire extinguishing is released in a protection area in the electronic distribution transforming cabinet in the submerged manner, the fire resource can be rapidly, exactly and effectively detected and extinguished only depending on one fire detecting tube introduced with the pressure and the fire extinguishing agent container bottle so as to combine the alarm and the fire extinguishing into the integration.

The invention belongs to the technical field of refrigerants, and particularly relates to a refrigerant replacing R-134a and a preparation method and application thereof. The refrigerant is prepared from the following components in parts by weight: 16 to 38 parts of fluoroethane, 10 to 28 parts of Z-1,2,3,3,3-pentafluoropropylene and 40 to 75 parts of 1,1,1,2,3,3,3-heptafluoropropane. The preparation method comprises a step of mixing the components in a vacuumized mixing tank according to the amount of a formula to obtain the refrigerant capable of replacing R-134a. The refrigerant (R-469) replacing R-134a provided by the invention has the effects of zero ozone depletion value (ODP) and extremely low greenhouse effect (GWP), and is energy-saving and environment-friendly.

The invention provides a steel cylinder design method and system of a fire extinguishing combined distribution system, a medium and equipment. The steel cylinder design method of the fire extinguishing combined distribution system comprises the steps that the fire extinguishing agent design usage amount of multiple protection areas is determined in the combined distribution system; one of the steel cylinders of all models are selected as a steel cylinder of a preset model; the steel cylinder is a steel cylinder for heptafluoropropane gas fire extinguishing; the number of the steel cylinders needed by the combined distribution system is determined according to the fire extinguishing agent design usage amount and the filling amount range of the steel cylinders; and after the number of the steel cylinders is determined, all the steel cylinder design schemes meeting the preset steel cylinder model selection rule are screened. According to the steel cylinder design method and the system ofthe fire extinguishing combined distribution system, all steel cylinder type selection design schemes can be provided for designers, the designers can comprehensively analyze and evaluate the design schemes, the minimum value of the steel cylinders and the minimum value of the filling amount of the steel cylinders needed by the whole protection area are determined, and therefore the steel cylindertype selection design scheme with the lowest manufacturing cost is determined.

The invention discloses a real-time detection device and method for the leakage rate of a bottled high-pressure heptafluoropropane fire extinguishing agent. The device comprises a measurement cavity and a vacuum fixing cavity which are installed on a to-be-measured bottle body, the measurement cavity is formed by closing a measurement cavity left shell and a measurement cavity right shell, and thevacuum fixing cavity is formed by closing a vacuum fixing cavity left shell and a vacuum fixing cavity right shell; and the measuring cavity left shell and the measuring cavity right shell as well asthe vacuum fixing cavity left shell and the vacuum fixing cavity right shell are connected and closed through shell fixing components. The vacuum air pump vacuumizes the measuring cavity and the vacuum fixing cavity by being connected with the first connector and the second connector, and the vacuum fixing cavity and the external environment form a pressure difference so as to be connected to themeasuring bottle body in an adsorption mode. Under the condition that the function of the bottled high-pressure heptafluoropropane is normally achieved, the small leakage amount of the bottled high-pressure heptafluoropropane can be collected for a long time, the accumulated leakage amount of the bottled high-pressure heptafluoropropane can be quantitatively measured, the measurement precision ishigh, and installation and operation are easy and convenient.