115results about How to "Reduce pumping time" patented technology

An ion pump and a charged particle beam device each includes two opposite flat-plate cathodes, an anode with a cylindrical shape having openings that face the respective flat-plate cathodes, a voltage application unit configured to apply a potential higher than potentials of the flat-plate cathodes to the anode, a magnetic field application unit configured to apply a magnetic field along an axial direction of the cylindrical shape of the anode, and a cathode bar arranged within the anode. The surface of the cathode bar is formed with a material that forms a non-evaporative getter alloy film on the anode or the flat-plate cathodes.

The invention relates to an automatic edge sealing technology for vacuum glass, which comprises the following steps of arranging supporters on basal board glass, arranging upper plate glass on the basal board glass, using low melting-point glass powder between the upper plate glass and the basal board glass for sealing edges, placing the upper plate glass and the basal board glass into a vacuum heating furnace to be heated and taking out upper plate glass and the basal board glass to get a finished vacuum glass, wherein in the step of using the low melting-point glass powder for sealing the edge, a section bar of low melting-point glass powder or the low melting-point glass powder is arranged on the basal board glass, and a gap of air escaping in the evacuation in the heating furnace is left in a chamber formed between the basal board glass and the upper plate glass. The invention has simple integrated structure, greatly shortens the evacuation time, increases the work efficiency, has reliable automatic evacuation and sealed package, good air tightness, little air leakage hazard, attractive appearance and production technology simplification, greatly promotes the development of the vacuum glass industry, and is particularly suitable for the industrialized, the scale and the standardized production of the vacuum glass.

A write amplifier for driving a bit line connected to a selected phase change memory cell drives the bit line with a first current driving capability and then drives the bit line with a second current driving capability lower than the first current driving capability.

The invention discloses a novel balloon expandable stent conveying system which comprises a balloon, an inner tube, a far-end outer tube, a corrugated tube, a soft head and a stent pushing tube. The inner tube runs through an inner cavity of the far-end outer tube and an inner cavity of the balloon; a combination body of the soft head and the inner tube is placed and connected into the neck part of the far end of the balloon; the farthest end of the far-end outer tube is placed into the neck part of the near end of the balloon and is connected with the neck part of the near end of the balloon; the balloon is of a one-layer or multilayer structure; and at least one layer of the balloon is made of a material with a micropore structure. The stent conveying system disclosed by the invention has a simple structure, also has the functions of pre-expanding a narrow tube cavity and conveying a stent, has good operation and control performance and strong passing performance, is rapid and convenient to operate and is cost-saving. When adopting the ePTFE (expanded polytetrafluoroethylene) material with the micropore structure, the balloon does not need to be folded and is simple to process; and time of sucking liquid in the balloon is short, the blood supply of far-end blood vessels is high in recovery speed, the balloon is changed into a cylinder shape with a small diameter after the liquid is pumped out, and the blood vessels cannot be damaged or the stent shifting cannot be caused in the retracting process. The balloon with the double-layer structure has higher pressure resistance capacity.

Disclosed is a vacuum smelting furnace, comprising smelting chamber, bush, cavity, middle vacuum gauge, low vacuum gauge, high vacuum valve, vacuum pump, low vacuum valve, protective gas source and heat electric power source, and molecular drag pump whose are inlet is connected to the high vacuum valve, the low vacuum gauge and low vacuum valve are separately connected to air exhausting mouth of the molecular drag pump, besides, dust arrester, partial pressure monitoring meter and auxiliary evaporation source with active getter material are added between of the and air extracting channel. The vacuum smelting furnace is suitable for smelting of oxidable metal material and alloy, especially for permanent magnet alloy of rubidium-iron- boron. The invention has simple structure can reduce air extracting time and save energy, increase production efficiency and production quality.

Provided is a coal mine gas prevention method for eliminating coal mine gas explosion, burst and exceeding by injecting nitrogen from the ground to discharge and mine coal bed gas. The method comprises the steps that wells are drilled from the ground, the high pressure nitrogen is injected into one or more coal beds from the multiple nitrogen injection wells, desorbing of the coal bed gas is reinforced, the desorbed gas is driven to be transported to the production wells from the nitrogen injection wells, the gas or mixed gas of the gas and the nitrogen is obtained from the multiple production wells, the coal bed gas content is decreased, the risks of coal mine gas explosion, burst and exceeding are eliminated, the utilization rate of the coal mine gas is increased, the gas discharged to the atmosphere during coal mine mining is reduced, and the atmosphere environment is protected. By adoption of the method, the coal bed gas content can be effectively decreased to be lower than the residual gas content set according to the coal mining safety requirements, and the gas produced by the production wells through the method can be fully utilized basically.

The invention relates to an efficient annular vacuum coating device for a fuel cell metal bipolar plate. The efficient annular vacuum coating device comprises a vacuum chamber, an ion source, target materials, a workpiece frame, a workpiece frame transmission system, a vacuum system, an isolating system and an electronic control system. According to the efficient annular magnetron sputtering device, compared with an original circular cavity, the areas, irrelevant to coating, in the center of the chamber are omitted, the effective use volume ratio of coating is increased, the air pumping time is shortened, and the coating efficiency is improved; secondly, the opposite-target sputtering mode is adopted, a substrate does not rotate, the constant target-substrate distance is kept, and uniformity of coating is facilitated; at the same time, the distance between two targets is shortened, the round larger chamber can better form a closed magnetic field, and enhancement of film base binding force is facilitated; and at the same time, the annular chamber can be divided into a plurality of branch chamber bodies, the pair of target materials of the same type is mounted in each branch chamberbody, and multilayer composite coatings can be deposited on the substrate surface. Compared with the prior art, the coating efficiency is high, the film layer quality is good, the yield is high, and the great significance is achieved on industrialization of the fuel cell metal bipolar plate coatings.

The invention provides a Roots vacuum pump, which belongs to the technical field of machinery and solves the technical problems of hard load start, high starting current, high impact on an electricity grid, high bearing impact, and the like of the existing Roots vacuum pump. The Roots vacuum pump comprises a pump body and a long pump shaft and a short pump shaft arranged in the pump body, wherein, rotors are respectively connected on the long pump shaft and the short pump shaft, the long pump shaft and the short pump shaft are connected with each other by a pair of engaged driver gears, one end of the long pump shaft extends out of the pump body on which an electric motor is arranged, and a rotating shaft of the electric motor and the pump shafts are connected by hydraulic driving mechanisms. The Roots vacuum pump has the advantages of favorable overload protection, low starting current, easy load start, short air suction time, etc.

The invention discloses a glass fiber-reinforced plastic polyurethane TPU composite tube. The glass fiber-reinforced plastic polyurethane TPU composite tube comprises an outer protective layer, an outer reinforcing layer, a sand inclusion structure layer, an inner reinforcing layer and a lining layer which are sequentially arranged from outside to inside, wherein the outer protective layer is a composite layer with quartz sand and unsaturated polyester resin, the outer reinforcing layer is a composite layer with glass fibers and unsaturated polyester resin, the sand inclusion structure layer is a composite layer with quartz sand, glass fibers and unsaturated polyester resin, the inner reinforcing layer is a composite layer with glass fibers and unsaturated polyester resin, and the lining layer is a low free nanometer polyester layer. The invention further discloses a manufacturing process of the glass fiber-reinforced plastic polyurethane TPU composite tube. The glass fiber-reinforced plastic polyurethane TPU composite tube has reliability, safety and economy, is mainly used for pulp conveying, bittern conveying, sea water desalination and corrosion-resistant and abrasion-resistant process pipelines, has the advantages of being light, high in strength, resistant to corrosion, high in abrasion resistance, long in service life, low in operation and maintenance cost and the like, and saves a large number of expenses for construction engineering.

The invention belongs to the technical field of coal mine safe production and particularly provides a down hole continuous screen pipe hole protection method for a coal mine. The method comprise the following steps that testing devices such as a drilling machine and a screen pipe conveying device and materials are transferred to a drilling construction site, a cylindrical reeling disc is reeled with a continuous screen pipe, and a hole clamping device is installed at the end of the screen pipe conveying device; drilling is conducted on a soft coal construction consequent layer or penetrating layer; after drilling is conducted to the position of a designed depth, drilling is stopped, and the screen pipe conveying device is installed on the drilling machine; the continuous screen pipe and the hole clamping device are inserted into the screen pipe conveying device, and the continuous screen pipe is conveyed into a drilling rod through the conveying device; a lower screen pipe drill bit is ejected away through the hole clamping device at the end of the continuous screen pipe, and the screen pipe is fixed to the wall of a drill hole; the continuous screen pipe is cut off at a hole mouth, and the drilling rod is withdrawn; and hole sealing continuous pumping is conducted through a large-diameter sleeve pipe. According to the down hole continuous screen pipe hole protection method for the coal mine, in soft coal drilling, the screen pipe putting in time is short, efficiency is high, the compression strength of the screen pipe is high, drill hole gas extraction efficiency is high, drill hole pumping and discharging efficiency are sufficiently improved, the gas pre-pumping time is shortened, and gas disasters are eliminated to the utmost extent.

The invention belongs to the field of metal smelting, and in particular relates to a titanium manganese alloy smelting device. The titanium manganese alloy smelting device comprises a smelting furnace, wherein a feeding device is arranged above the smelting furnace and is connected with a feeding hole in the top of the smelting furnace through a pipeline; a vacuum pump, a molecular drag pump and an air distribution device are connected with the smelting furnace through pipelines respectively; valves are arranged on the pipelines among the vacuum pump, the molecular drag pump, the air distribution device and the smelting furnace respectively; a vacuum meter and a heating device are arranged on one side of the smelting furnace; brackets are arranged on two sides of the bottom of the smelting furnace; a discharging hole is formed in the middle of the bottom of the smelting furnace; a pouring mold with an upward opening is arranged at a position, corresponding to the discharging hole, below the smelting furnace; a cast ingot base pad and a heat-preserving base pad are sequentially arranged at the lower part of the inner cavity of the pouring mold from bottom to top; a through hole is formed in the middle of the heat-preserving base pad; a circular arc of 80 to 100 degrees is formed between the upper end surface of the heat-preserving base pad and the horizontal plane. The titanium manganese alloy smelting device is simple in structure, the air exhaust time is shortened, the air exhaust energy consumption is reduced, and the quality of a cast ingot is effectively improved.

The invention discloses a vacuumizing system. The vacuumizing system is used for vacuumizing a vacuum chamber and comprises a backing pump, a main pump, a pre-pumping valve and a main valve, wherein the main valve is provided with an inlet, a pre-pumping port and an outlet; the inlet of the main valve communicates with a vacuumizing port of the vacuum chamber; the pre-pumping port of the main valve communicated with an inlet of the pre-pumping valve; the outlet of the main valve communicates with an extraction opening of the main pump; and an extraction opening of the backing pump simultaneously and directly communicates with an exhaust port of the main pump and an outlet of the pre-pumping valve through a tee coupling. Through the vacuumizing system, the vacuum chamber can reach the required vacuum degree in a quite short time.

The invention discloses a water blowing structure for coal mine underground gas extraction and a construction method thereof. The water blowing structure for coal mine underground gas extraction comprises an extraction system and an air compressing system. A gas suction port is formed in the upper portion of a gas-water separator; a first valve is arranged on the gas suction port and connected with a three-way joint of the extraction system through a first hose; the bottom of the gas-water separator is connected with a drainage device; the side edge of the upper portion of the gas-water separator is connected with a second hose, and the second hose is connected with a water blowing device; the side edge of the water blowing device is connected with the air compressing system through a second valve, and the other end of the water blowing device is connected with a hole-sealing screen pipe; and a water blowing pipe is arranged inside the hole-sealing screen pipe ad connected with the second valve. After a pipeline is connected, the second valve with a high-pressure pipe rapid connector is opened to supply air into a drilled hole when accumulated water exists in the drilled hole, so that the accumulated water is blown out, then enters the gas-water separator and is drained from the drainage device. The accumulated water in the drilled hole is discharged timely through air-compressing water blowing, hole collapse of the drilled hole due to soaking of the accumulated water is prevented, long-term efficient extraction of the gas extraction drilled hole is kept, and the great effect is achieved.

The invention belongs to the technical field of coal mine safety production. In order to solve the problems of difficulty in field large-scale popularization and application, ultralow oxidation rate on coal at the normal temperature of an existing permeability increasing agent, the invention provides a coal reservoir permeability increasing agent based on aqueous solution of sodium hypochlorite. The coal reservoir permeability increasing agent consists of a component A, a component B and water; the component A is sodium hypochlorite solid or sodium hypochlorite solution; the component B is a pH regulator and is hydrochloric acid or sulfuric acid of which concentration is smaller than 10%; concentration of effective chloridion in the coal reservoir permeability increasing agent based on the aqueous solution of sodium hypochlorite is 1% to 6%; a pH value of the coal reservoir permeability increasing agent based on the aqueous solution of sodium hypochlorite is 9 to 13. Gas permeability of a coal seam is improved, and an actual working surface is subjected to pre-drainage rapidly and regionally. When the coal reservoir permeability increasing agent is adopted to carry out permeability increasing on coal, gas drainage time is greatly shortened; a drilling work amount is reduced; high-gas low-gas-permeability coal seam permeability increasing and efficient gas drainage are implemented, regional gas pre-drainage efficiency of a coalface and a coal road strip is improved, drainage time is shortened, a drainage radius is enlarged, the drilling work amount is reduced, and gas disasters are eliminated to the greatest extent.

The invention discloses a breast pad and a bra body which are applied to a breast pump, and belongs to the technical field of pumping transfer of body fluid. Squeezing bodies for squeezing breast lactiferous sinuses are arranged on an inner wall of the breast pad. The arrangement of the squeezing bodies conforms to the physiological constructions of the breasts of a woman more. In the milk pumping process of the breast pump, the breast lactiferous sinuses are squeezed by the squeezing bodies, so that squeezing of breast milk is facilitated, the milk pumping efficiency of the breast pump is increased, the milk pumping time is shortened, and the probability of pain or stretching (deformation) of sore nipples in the milk pumping process is lowered. The breast pad is arranged in a milk pumping bra to construct the bra body, and gas is introduced from a through hole in the milk pumping bra in order that the squeezing bodies project, so that the breast lactiferous sinus squeezing strength is enhanced, and squeezing of the breast milk is further facilitated. A squeezing pump which is communicated with the through hole in the milk pumping bra is arranged on the breast pump, so that a power source is provided for filling of gas into the through hole, and the bra body and the breast pump are simple in structures and are convenient to operate on the premise of increasing the milk pumping efficiency.