48 results about "Vacuum shut-off valve" patented technology

The invention discloses a fuel cell engine purging system and a control method thereof. The fuel cell engine purging system is mainly composed of an air filter, an air compressor, an intercooler, a humidifier bypass valve, an anode purging shut-off valve, an electric pile air inlet shut-off valve, an electric pile air outlet shut-off valve, an air humidifier, a back pressure valve, a vacuum shut-off valve, a hydrogen tail exhaust valve, a hydrogen cycle pump, a three-way steering valve and a hydrogen inlet shut-off valve. The residual water can be fully removed in a short time with low energyconsumption.

The present invention provides a vacuum gauge calibration apparatus capable of calibrating and testing a vacuum gauge without displacement or separation of the vacuum gauge, the vacuum gauge being attached to a vacuum device under operation together with developing a movable vacuum gauge calibration device, and an operating method thereof. According to the present invention, there is provided an apparatus for calibrating and testing a vacuum gauge to be calibrated without displacement, the vacuum gauge being connected to a vacuum device, the apparatus comprising: a vacuum shut-off valve for opening and closing a piping for connecting the vacuum device to the to-be-calibrated vacuum gauge; and a movable vacuum gauge calibration device connected to the to-be-calibrated vacuum gauge, wherein the movable vacuum gauge calibration device includes: a reference vacuum gauge, a vacuum connection valve, a vacuum chamber, a gate valve, and an exhaust device which are connected to the to-be-calibrated vacuum gauge side in series; a gas supply source connected to the vacuum chamber for generating pressure in the vacuum chamber; a leak valve for controlling gas flow in the gas supply source and supplying the gas the vacuum chamber; and a vacuum gauge for the vacuum chamber for measuring vacuum pressure in the vacuum chamber.

The invention discloses a vacuum die-casting system of a die-casting machine, which comprises the die-casting machine, a fixed-mold wallboard of a die casting mold, and a vacuum program control device of a die-casting system, wherein the vacuum die-casting system of the die-casting machine is arranged on the fixed-mold wallboard, the template of the fixed-mold wallboard of the die casting mold is provided with a channel, the outlet of the channel is connected with a vacuumizing device consisting of a vacuum pump, a negative pressure tank, a filter and a vacuum shut-off valve of the die casting mold by pipes; a channel leading to the center of the template of the die casting mold is connected with a casing pipe, the inner end of the casing pipe is communicated with a cavity of the template of the die casting mold, and a valve rod connected with a piston rod of an oil cylinder on the fixed-mold wallboard is arranged in a hole arranged at the outer end of the casing pipe. When carrying out die assembling on the die casting mold of the die-casting machine, by aid of the negative pressure produced by the vacuum pump of the vacuum die-casting system, the invention instantaneously extracts gases in the cavity and the pipe of the template of the mold, and closes the channel timely when the cavity is filled with molten metals, thereby preventing the molten metals from entering the vacuum pipelines so as to carry out die-casting molding on the molten metals in a vacuum.

The invention discloses a gas distribution device for spacecraft leak rate detection, including a gas turbocharger, a pressure transmitter, a filter, a pressure stabilizing chamber, a high pressure reducing valve, a medium pressure reducing valve, a driving air pressure reducing valve, a driving air stop valve, an air intake stop valve, a vacuum stop valve, a safety valve, an unloading valve, a vacuum pump, a pressure gauge and a stainless steel pipe. A gas source inlet is connected with a leak indication gas for leak rate detection. A driver inlet is connected with compressed air to drive thegas turbocharger. The leak indication gas is pressurized through the gas turbocharger, and then enters the pressure stabilizing chamber and a corresponding gas transmission loop. Two channels of highpressure and three channels of low-pressure gas are output through devices such as the pressure reducing valves, a high pressure stop value and the pressure transmitter. The vacuum pump is used for pumping out the gas in a gas transmission pipe to improve the purity of the leak indication gas. The gas distribution device of the invention meets the requirement of spacecraft service life and reliability detection, and can improve the reliability of the charging and discharging process of the leak indication gas, shorten the gas charging and discharging time and reduce the cost of leak rate detection.

The invention discloses a vacuum stop valve under zero gravity. The vacuum stop valve comprises a handle, a valve element, a spring, a valve cap and a valve body. The valve element and the spring are installed in the valve body through the valve cap. One end of the valve cap is in threaded connection with the valve body and is provided with a deep groove and a shallow groove. One end of the handle provided with tenons is placed in the grooves and is used in cooperation with the valve cap. A positioning groove is formed in the bottom end face of a threaded hole in the valve cap and is used for installation of the spring. An annular sealing groove is formed in the inner wall of a through hole of the valve cap and is used for installation of a small radial seal ring. The small radial seal ring plays a role in guiding and dust prevention and prevents the valve element from waggling in the radial direction in the axial moving process. Axial soft seat sealing is adopted for internal sealing of the vacuum stop valve, sealing force is provided by the spring, and therefore reliable sealing of multiple times of opening and closing operations can be achieved; a plunger type bi-radial seal ring and a sealing retainer ring are adopted for external sealing, the two rings are mutual backups, and therefore the reliability of the valve is improved.

The invention discloses a high-power microwave transmission device and method for a high breakdown threshold value. The device comprises a circular waveguide with the inner surface plated with a nanometer porous alloy material, and movable gate type vacuum stop valves are arranged at the two ends of the circular waveguide; the circular waveguide is internally plated with the nanometer porous alloy material, the waveguide and gas in the microwave system can be adsorbed, surface plasma formation under the high-power microwave action is inhibited, and the high-power microwave system breakdown threshold value is increased. For the movable gate type vacuum stop valves, an innovative dynamic vacuum seal technology is used, the internal vacuum degree of a microwave system or the circular guide can be kept, the phenomenon that due to the fact that the nanometer porous alloy material plated on the inner surface is exposed in the atmosphere, passivation is caused, the problem that the nanometer porous alloy material plated on the surface is passivated and repeatedly activated is avoided, and the service life of the equipment under the high breakthrough threshold value is prolonged.

The invention discloses a quick cooling structure of a large high-temperature resistance furnace. The quick cooling structure comprises a freezing tower, at least two vacuum stop valves and a high-temperature pipeline fan, wherein the freezing tower, the high-temperature pipeline fan and the large high-temperature resistance furnace are sequentially communicated through pipes to form a closed loop, at least one vacuum stop valve is arranged on the pipe between the freezing tower and the large high-temperature resistance furnace, and at least one vacuum stop valve is arranged on the pipe between the high-temperature pipeline fan and the large high-temperature resistance furnace. The problem that at present, the large high-temperature resistance furnace is too long in temperature reduction time and accordingly influences a workpiece or a material production period and hinders improvement of enterprises' capacity is solved by means of the quick cooling structure of the large high-temperature resistance furnace.

The invention provides a special gas accurate controller for cell exposure. The special gas accurate controller comprises a stirring mixer, wherein the stirring mixer is provided with three accurate gas flow controlling valves which are connected with a compressed air cylinder, a carbon dioxide gas cylinder and a special equalization gas cylinder, the outer surface of each of the compressed air cylinder, the carbon dioxide gas cylinder and the special equalization gas cylinder is provided with a temperature controlling sleeve, two ends of the special equalization gas cylinder are provided with a vacuum stop valve and an equalization stop valve, the rear end, provided with an electrically controlled three-way valve, of the equalization stop valve is connected with a vacuum pump, the other end of the equalization stop valve is connected to a special total gas source by virtue of a total gas source stop valve, one end of the special equalization gas cylinder is provided with a swing shaft, the swing shaft is connected to an eccentric gear by virtue of a rocker, an output pipeline of the stirring mixer is connected to an exposure gas hole arranged in an exposure gas bin by virtue of an exposure gas flow controlling valve and carries out a quantitative exposure test on the cell on a cell film plate, and a computer controller is used for controlling all electronic valves, motors and total temperature controllers according to a preparatory program to reach the purpose of accurately controlling the special gas during cell exposure. The special gas accurate controller has the beneficial effect of accurately controlling the special gas to carry out scientific research and scientific experiments of cell exposure.

The invention discloses a high-power microwave transmission device and method for a high breakdown threshold value. The device comprises a circular waveguide with the inner surface plated with a nanometer porous alloy material, and movable gate type vacuum stop valves are arranged at the two ends of the circular waveguide; the circular waveguide is internally plated with the nanometer porous alloy material, the waveguide and gas in the microwave system can be adsorbed, surface plasma formation under the high-power microwave action is inhibited, and the high-power microwave system breakdown threshold value is increased. For the movable gate type vacuum stop valves, an innovative dynamic vacuum seal technology is used, the internal vacuum degree of a microwave system or the circular guide can be kept, the phenomenon that due to the fact that the nanometer porous alloy material plated on the inner surface is exposed in the atmosphere, passivation is caused, the problem that the nanometer porous alloy material plated on the surface is passivated and repeatedly activated is avoided, and the service life of the equipment under the high breakthrough threshold value is prolonged.

The present invention relates to casting technology. The vacuum sucking casting process of preparing magnesium base composite material includes the following steps: 1. fixing preheated mold casing onto partition with fixing sleeve and introducing mixed protecting gas; 2. opening the cut-off valve to vacuum pump the sealed cavity and maintaining the vacuum; 3. eliminating vacuum for refined magnesium base composite material melt to be poured into the mold cavity fast, opening the vacuum cut-off valve while pouring to the pouring head of the mold casing for the magnesium base composite material liquid to fill the cavity, and maintaining vacuum unit complete solidification. The present invention proposes new method of vacuum sucking casting and applies vacuum sucking casting method in preparing magnesium base composite material and magnesium alloy part, to form thin-wall complicated magnesium base composite material casting successfully.

The present invention provides a powder supply device for supplying powder to a container of a food processing machine. The powder supply device comprises a storage cylinder (50) which is arranged above the container and is provided with an exhaust port for exhausting gas, an introduction port for introducing powder and a supply port for supplying the powder into the container; a first vacuum shutoff valve (51) that opens and closes the exhaust port; a second vacuum shutoff valve (52) that opens and closes the introduction port; a third vacuum shutoff valve (53) that opens and closes the supply port; temperature sensors (54, 55, 56) for measuring the temperature in the storage cylinder; and a vacuum device (70) that vacuumizes the inside of the storage cylinder. A control device reduces the pressure in the storage cylinder to a pressure lower than or equal to a pressure at which the temperature of the powder begins to decrease by latent heat of evaporation. And before the measured temperature in the storage cylinder is reduced to be lower than the target temperature, the vacuum device is operated in a state that the first vacuum stop valve is opened and the second vacuum stop valveand the third vacuum stop valve are closed.

The invention discloses a pollutant suction system applied to a vacuum toilet. The system comprises two vacuum negative pressure tanks which are in air pressure communication through a connecting pipe, one vacuum negative pressure tank is an adsorption tank used for sucking pollutants and temporarily storing the pollutants, the other vacuum negative pressure tank is a pressure supply tank for supplying vacuum negative pressure to the adsorption tank, a constant pressure device is arranged on the connecting pipe, a pollutant inlet pipe used for sucking the pollutants and a pollutant dischargingpipe used for discharging pollutants are arranged on the adsorption tank, a vacuum stop valve is arranged on a pollutant inlet pipe, and an exhausting pipe used for extracting air is arranged on thepressure supply tank. With the adoption of the structure, the adsorption tank can always keep higher pollutant adsorption capability, requirements for the power supply environment are reduced, and thevacuum toilet can be really promoted and popularized.

The invention discloses a quick cooling structure of a large high-temperature resistance furnace. The quick cooling structure comprises a freezing tower, at least two vacuum stop valves and a high-temperature pipeline fan, wherein the freezing tower, the high-temperature pipeline fan and the large high-temperature resistance furnace are sequentially communicated through pipes to form a closed loop, at least one vacuum stop valve is arranged on the pipe between the freezing tower and the large high-temperature resistance furnace, and at least one vacuum stop valve is arranged on the pipe between the high-temperature pipeline fan and the large high-temperature resistance furnace. The problem that at present, the large high-temperature resistance furnace is too long in temperature reduction time and accordingly influences a workpiece or a material production period and hinders improvement of enterprises' capacity is solved by means of the quick cooling structure of the large high-temperature resistance furnace.

The invention discloses a vacuum shut-off valve for railway vehicle toilets, which relates to the technical field of water supply and drainage sanitary equipment for railway vehicles, and includes a valve cover, a valve body, a leather bowl, a curved clamp, a gland and a rubber duckbill. The valve body The upper and lower ends and one side of the valve body are provided with openings and communicate with each other, the gland bolt is connected to the upper end of the valve body, the leather cup is connected to the opening on the side of the valve body, the valve cover is installed on the leather cup, and the valve cover The rubber duckbill is set in the valve body and communicated with the opening at the upper end of the valve body. The invention meets the requirements of the operation of railway vehicles, so that the vehicle can be stationary and the sewage can be discharged smoothly. , When the vehicle moves at high speed and generates negative pressure, it can effectively isolate the air from entering the vehicle toilet. At the same time, the product has a simple structure, reasonable layout, easy installation and disassembly, and is conducive to later maintenance and maintenance.

The invention discloses a pressure-regulating and mold-filling high-pressure solidification casting device and casting method. The device comprises a smelting furnace, an injection rod, a riser tube,a hammer head, a charging barrel, a mold, a vacuum tube and a vacuum stop valve. By means of the device, a high-quality aluminum alloy melt can be taken from the center of molten aluminum in a smelting furnace, the molten aluminum is conveyed into a mold cavity through the closed liquid riser tube and a charging barrel by controlling a pressure difference between the interior of the smelting furnace and a mold cavity by a computer, and the molten aluminum level stably rises in the whole process, so that the contact area between molten aluminum and air in the conveying and mold filling stages is greatly reduced, oxidizing slag is reduced, and meanwhile, a certain vacuum condition is formed in the mold cavity, so that the air content of the molten aluminum is reduced, and the mold filling capacity of the molten aluminum in the mold cavity is improved. After mold filling is completed, a casting is solidified under a high pressure, the casting is compact in structure and fine in grain, theforming probability of casting defects such as shrinkage porosity, shrinkage cavities and pinholes is greatly reduced, and finally the internal quality of the casting and the mechanical property of abody are greatly improved.