5493 results about "Pumping vacuum" patented technology

A vacuum chamber is evacuated through a first evacuation passage provided with a first valve and a second evacuation passage provided with a second valve. An opening degree of the first valve is adjusted so that a pressure in the vacuum chamber becomes substantially equal to a process pressure P; an opening degree of a butterfly valve further provided in the second evacuation passage is adjusted to substantially equal to a set value determined by a table in order to set flow rates of gases to be evacuated through the first evacuation passage and the second evacuation passage to be substantially equal to corresponding set values determined by the recipe; and an opening degree of the second valve is adjusted so that a measurement value of a differential pressure gauge further provided in the second evacuation passage becomes substantially equal to a differential pressure written in the table.

A method of forming a refractory metal film doped with III or V group elements. The first process gas is supplied from a first gas source through a first gas introducing member to and through a gas supply mechanism toward a substrate within a processing vessel. The second process gas is supplied from a second gas source through a second gas introducing member to and through the gas supply mechanism toward the substrate within the processing vessel. The processing vessel is purged by evacuating the processing vessel by an evacuating mechanism, while supplying the inert gas from a third source through a third gas introducing member to and through the gas supply mechanism into the processing vessel. The supplying the first process gas and the supplying the second process gas are repeated with the supplying the purging gas being carried out between supplying the first and second gases performed so that residual gas present in the processing vessel after performing the supplying of the first and second process gases is reduced to a level of 1 to 30% based on the entire capacity of the processing vessel.

A composite material of sandwich structure integrating loading, heat insulation and ablation and the manufacturing method are characterized in that an integrated pre-forming body is acquired by puncture and suture of the reinforcing material of a bearing layer, the reinforcing material of an ablating cover, and a heating insulation layer positioned between the two layers; an epoxy resin system and a phenolic resin system are injected simultaneously into a vacuum-pumped mould, in which the integrated forming body is pre-placed, by two sets of RTM injection systems respectively, then, the reinforcing materials of the bearing layer and the ablating layer are soaked by epoxy resin and phenolic resin respectively; and the composite material of sandwich structure integrating loading, heat insulation and ablation can be obtained by solidified molding after mould filling. The invention has the advantages that the composite material of sandwich structure integrating loading, heat insulation and ablation is put forward and can be integrally formed by one-time operation, the function of the interlayer between every layer of the composite material is enhanced greatly, the integrality is good; the stratifying and peeling of the composite can be reduced effectively, and the products have good designable property and can be widely applied to the structural parts of aerospace which need heating insulation and thermal protection.

The invention relates to an air pressure splitting off vacuum pre-pressing method to reinforce soft soil that is a method to process groundsill. The process is that: cleaning the field, laying plastic draining board, setting high pressure gas transferring system, setting the vacuum system, inflicting high pressure gas, pumping to vacuum, and repeating to inflict high pressure and pumping according to the demand.

The invention provides a testing device for the combustion rate of combustibles in a plateau artificial oxygen-enriched environment, belonging to a field of fire safety. The testing device consists of the following seven parts: a combustion chamber, a positioning mechanism, an air distribution system, an airflow-circulation and concentration-monitoring system, a vacuum-pumping system, an ignition system and a data acquisition system. A sample is arranged on a sample support by a sample clamper, and then vacuum-pumping is carried out to a sealed chamber by the vacuum-pumping system; each single high-purity gases are mixed in the sealed chamber after passing through a mass flowmeter and a flow regulating valve; the total pressure of the gases is displayed by a high-precision vacuum manometer; when the requirements of the total pressure of the gases and gas compositions are met, a micro-air pump is started to mix the airflow in the sealed chamber; a laser light source is started to ignite the sample after the concentration of the gas compositions is steady; the sample combustion flame passes through two thermocouples sequentially; temperature change curves of the thermocouples are obtained by A/D conversion and the data acquisition system; and the time between two maximum temperature points of the curves corresponding to the two thermocouples is taken as the combustion time of the sample between the thermocouples with fixed distance, thus obtaining the combustion rate of the sample under the total pressure of the gases and the concentration of the gas compositions. The testing device has stable and reliable testing performance, and is simple and convenient.

The invention discloses a low-cost high-efficiency forming process of a fiber reinforced thermoplastic composite material, comprising the following steps of: arranging a workpiece to be formed, which is prepared by laying fiber reinforced materials, in a closed space containing a mold template; laying demolding cloth and a diversion grid in sequence on the workpiece; laying or coating a demolding material under the workpiece; arranging an impregnating pipe on one side of the width direction of the workpiece; arranging a vacuum pipeline on the other side along the length direction of the workpiece and parallel to the side surface; arranging a breathable material between the vacuum pipeline and the workpiece; then pumping vacuum in the closed space through the vacuum pipeline, simultaneously raising the temperature of the mold template to the impregnating temperature of 50-250 DEG C; and finally filling molten thermoplastic resin or the precursor of the thermoplastic resin of which the temperature is 50-250 DEG C and the viscosity is 0.15-1.0Pa.s into the workpiece from the impregnating pipe, and then insulating for polymerization or reducing the temperature for cooling and forming. The forming process needs not to prepare a pre-impregnated belt in advance and has low cost and high efficiency, and the workpiece can be formed easily and has superior toughness and damage tolerance.

The invention relates to a vacuum high speed blender which comprises a main cover composed of a cup cover and a bottom cover. The main cover is provided with an exhaust suction nozzle and an exhaust hole. The vacuum high speed blender further comprises an auxiliary cover, a vacuum nozzle is arranged on the auxiliary cover, and the bottom cover and the auxiliary cover are detachably assembled through a positive and negative turn-lock clasp; the exhaust suction nozzle is arranged on the bottom cover through an elastic device in a vertically stretchable and movable mode, an upper coupling portion is arranged on the exhaust suction nozzle, and a lower coupling portion is arranged on the vacuum nozzle; an air cavity is formed between the auxiliary cover and the bottom cover, the exhaust suction nozzle, the exhaust hole and the vacuum nozzle stretch into the air cavity, and the auxiliary cover or the bottom cover is provided with a ventilation groove communicating the air cavity with the external world. When the vacuum high speed blender is in use, no food residue is splashed to the main cover, only the auxiliary cover needs to be disassembled and washed, the main cover does not need to be flushed, and the service life of the air pump is prolonged. The main cover and the auxiliary cover are detachably assembled through the positive and negative turn-lock clasp, and in the assembling and disassembling process, coupling and separation of the exhaust suction nozzle and the vacuum nozzle are achieved. During vacuumizing of the cup body, the ventilation groove achieves the exhaust function, and the air leakage function is achieved during air return of the cup body.

The invention discloses a full-automatic packaging machine. The full-automatic packaging machine comprises a rack, a packaging bag supply device, a bag opening device, a filling and discharging device, a grabbing and conveying device and a vacuum pumping and sealing device. The packaging bag supply device, the bag opening device, the filling and discharging device and the vacuum pumping and sealing device are transversely arranged on the rack in sequence. The packaging bag supply device comprises packaging bag supply racks and a bag sucking mechanism used for sucking packaging bags from the packaging bag supply rack. The grabbing and conveying device is arranged on the lower portions of the bag opening device and the filling and discharging device in sequence in a penetrating mode and usedfor clamping and conveying the packaging bags sucked by the bag sucking mechanism to the bag opening mechanism to open the bags, keeping the opened packaging bags in an opened state and clamping andconveying the packaging bags into the filling and discharging device for filling. By means of the structure design, the full-automatic packaging machine is simple and compact in structure, stable in operation and capable of effectively preventing equipment failure caused by food materials spilt out of the bags, and the packaging efficiency is greatly improved.

The invention provides a method for preparing Ti-6Al-7Nb medical titanium alloy spherical powder. The preparation method comprises the following steps: preparing materials of alloy components according to ASTM F1295 standards and carrying out two times of vacuum melting on a mother alloy ingot; preparing the mother alloy ingot into an alloy electrode bar through forging and machining; carrying out pre-vacuumizing treatment on atomization equipment and introducing mixed inert protective gas; conveying the electrode bar into an atomization chamber through a feeding system and heating the end face of the electrode bar by using a plasma torch; preparing metal liquid drops by using a centrifugal effect of a rotary electrode and instantly condensing the metal liquid drops into spherical metal powder; after cooling the high-nitrogen stainless steel spherical powder, removing non-metal impurities through an electrostatic impurity removing device; and finally, carrying out powder package by adopting multilayered vacuum heat sealing. The method provided by the invention has the characteristics of high production efficiency, strong batch stability, high fine powder yield and the like; and the Ti-6Al-7Nb medical titanium alloy spherical powder with high sphericity degree, good purity, strong mobility and smooth and clean surface can be easily prepared.

The invention relates to a production method of a chromium-aluminum alloy target material, which includes the following steps: (1) placing chromium powder and aluminum powder into a V-shaped mixer for mixing; (2) placing the powder into a cold isostatic pressing sheath, vacuumizing, sealing, suppressing for 10 to 20 minutes, then placing in a vacuum self-propagating high-temperature synthetic furnace, and performing self-propagating reaction to acquire foamed chromium-aluminium alloy; (3) smashing the chromium-aluminium alloy into alloy powder with size of -200 mesh, placing the alloy powder in the cold isostatic pressing sheath for suppressing, so as to obtain a chromium-aluminium alloy blank; (4) placing the alloy blank in a steel sheath for vacuum degassing, then, performing hot isostatic pressing sintering treatment to obtain a chromium-aluminium alloy ingot; and (5) machining the chromium-aluminium alloy ingot to obtain a finished chromium-aluminium alloy target material. According to the invention, after the two raw materials are fully mixed and before the hot isostatic pressing sintering treatment is carried out, the alloying treatment in the step (2) is particularly adopted, so the prepared chromium-aluminum alloy target material has high density, uniform crystallite size distribution and excellent vacuum coating property.

The invention provides a superconductivity insulation material electrical characteristic test device which comprises a first casing, a second casing, a refrigerator, a test cable and a vacuumizing device. The first casing is provided with a first inner cavity, the second casing is made of heat conduction materials and arranged in the first inner cavity, the second casing is provided with a second inner cavity, a test electrode is positioned in the second inner cavity, a first cooling head of the refrigerator is fixedly connected with the second casing, the first end of the test cable is connected with the test electrode, the second end of the test cable is used for being connected with test equipment outside the first casing, the vacuumizing device is respectively connected with the first casing and the second casing and used for vacuumizing the first inner cavity and the second inner cavity, and the second casing is connected with the vacuumizing device through a first air pipe arranged in the first inner cavity. The technical scheme of the superconductivity insulation material electrical characteristic test device is that a test environment meeting work condition requirements of an international thermonuclear experimental reactor (ITER) device can be simulated in the second inner cavity to provide test methods for researching insulation material electrical characteristics when a superconducting magnet runs stably.

The invention relates to nanometer silicon carbide granule reinforcing aluminum base composite material and its manufacturing method. It solves the defect of uneven granule distribution, complex manufacturing technology, and high cost in traditional method. The nanometer silicon carbide granule reinforcing aluminum base composite material is made up of nanometer silicon carbide granule and aluminum powder. The former volume is 0.5-20%. The latter is 80-99.5%. The manufacturing method includes the following steps: mixing the raw material; putting into sealed ball milling pot; pumping vacuum; repeating for 2-20 times; high energy ball milling; hot pressing sintering; and hot pressing. The invention has the advantages of simple technology, low cost, even granule distribution, and high powder manufacturing efficiency. And it can obviously increase the mechanical property of the composite material.

The invention discloses a multipurpose attaching machine for 3D glass curved screens. The multipurpose attaching machine comprises a rack, and two vacuum cavities, a vacuumizing mechanism, a glass conveying mechanism and two turning mechanisms are arranged in the rack; the vacuum cavities are used for containing Film protection films, and each vacuum cavity comprises a Film protection film positioning mechanism and a Film protection film fine tuning mechanism; the vacuumizing mechanism is used for vacuumizing the vacuum cavities; the glass conveying mechanism is used for automatically conveying 3D glass, and CCD vision inspection units matched with the Film protection film fine tuning mechanisms are arranged at the bottom of the glass conveying mechanism; the turning mechanisms are used for positioning and turning the glass, and each turning mechanism comprises a cavity cover plate, a glass positioning fixture, a pneumatic clamping mechanism and a rotating shaft; after the 3D glass is manually placed in the glass positioning fixtures in parallel to be clamped, driving mechanisms drive the 3D glass to turn along with the cavity cover plates to the position over the Film protection films to complete attaching of the glass and the Film protection films. The multipurpose attaching machine for the 3D glass curved screens has the advantages of being in precise in glass positioning and Film protection film positioning, good in cavity sealing and vacuumizing effect, high in attaching efficiency, good in attaching effect and the like.

The invention discloses a preparation molding method of a Glare component, and belongs to the field of preparation and molding of composite materials. The method comprises the following steps: treating the surface of an aluminum alloy blank; laying a composite laminate; positioning the composite laminate on a concave die of a differential-pressure molding device; treating by vacuumizing and side pressing; heating the composite laminate to reach the temperature required for realizing the synchronization of solidifying of epoxy resin and age molding of aluminum alloy; performing bidirectional differential-pressure loading on the composite laminate in the differential-pressure molding device to realize the synchronization of the solidification of the epoxy resin and age molding and strengthening of aluminum alloy, thus realizing the preparation of a Glare laminate and integral molding of the component; then clipping redundant blanks on the Glare component. The preparation molding method of the Glare component is applicable to integrated molding of the Glare components of various complex structures, is also high in molding efficiency, outstanding in accuracy, small in resilience and relatively high in engineering application value.

The invention relates to a light corundum-mullite refractory brick and a preparation method thereof. The preparation method comprises the steps of evenly dispersing 0.5-1wt% of silicon oxide micro powder and 2-4wt% of active alpha alumina micro powder in 5-8wt% of silica sol to obtain modified silica sol, placing 40-70wt% of porous corundum-mullite ceramic particles in a vacuum mixer, carrying out vacuum pumping until the vacuum is below 2.5 kPa, keeping the constant pressure for three minutes, then pouring the modified silica sol into the vacuum mixer, mixing for ten minutes and closing the vacuum pumping system, pouring 10-25wt% of porous corundum-mullite ceramic fine powder, 10-20wt% of corundum fine powder, 1.5-4wt% of silicon oxide micro powder and 1-3wt% of active alpha alumina micro powder into the vacuum mixer for mixing and mechanical pressing, drying and finally preserving heat at 1400-1600 DEG C for 2-10 hours. The prepared product has the characteristics of controllability in apparent porosity and pore size, low thermal conductivity, good thermal shock stability and strong medium erosion resistance.