162results about How to "Increase pumping speed" patented technology

The presence or absence of a suction condition in an implantable blood pump is determined at least in part based on a parameter related to flow, such as a parameter related to thrust on the rotor of the pump. A local extreme of the parameter representing the minimum flow during ventricular diastole in an earlier interval is used to establish a threshold value. A value of the parameter representing the minimum flow during ventricular diastole in a later interval is compared to this threshold. If the comparison indicates a substantial decline in the minimum flow between the earlier and later intervals is associated with a suction condition. During the absence of a suction condition, the threshold is continually updated, so that the system does not indicate presence of a suction condition if the flow decreases gradually.

A pumping system comprising: a probe to suction a fluid from a fluid reservoir; a pump in fluid communication with said probe; a sensor for detecting phase changes in said pumping system, said sensor in fluid communication with said probe or pump, said sensor generating a sensor signal; a fluid exit from said pumping system, said fluid exit being in fluid communication with said pump; and a variable force check valve located between said probe and said fluid exit.

An apparatus includes a transfer unit under an atmospheric condition and having a robot therein; and at least one process chamber connected to one side of the transfer unit with a slot valve there between, and being alternately under a vacuum condition and under an atmospheric condition.

A cryopump includes: a cryopump chamber having an inlet port through which a gas to be pumped is introduced; a refrigerator provided with a second cooling stage provided in the cryopump chamber; an intermediate member thermally coupled to the second cooling stage; and a cryopanel having a connecting part connected to the intermediate member at a position farther from the inlet port in the direction in which the gas is introduced than the second cooling stage, and extending from the connecting part toward the inlet port. For example, a cryopump having a suspended panel structure is provided.

The control of the coolant flow is accomplished through valving or by adjusting the pumping speed of a water pump and a water motor, or a combination of all three elements. During normal operation, where engine cooling is not required, the speed control coupling maintains a slow and constant water pump speed at all engine-operating speeds. The valve is maintained to stop coolant flow from entering the radiator while allowing coolant to flow through a heater. If engine cooling is required, the valve is actuated such that coolant is circulated to the engine and through the radiator. If air conditioning is required, the speed control coupling simply increases the water pump speed and the fan speed while the valve is set to bypass coolant flow to the engine. If air conditioning and engine cooling are required, the valve is actuated to allow coolant flow to the engine.

The invention discloses a conical screw rotor and a double-screw vacuum pump thereof and belongs to the field of dry double-screw vacuum pumps. The conical screw rotor comprises a suction section, a compression section and an exhaust section, wherein molded lines of cross sections of the suction section, the compression section and the exhaust section change continuously along spiral spread angles; the molded lines with uniform pitches and uniform cross sections are adopted in the suction section and the exhaust section of the conical screw rotor, the molded lines with variable pitches and variable cross sections are adopted in the compression section of the conical screw rotor; spiral spread directions of a main screw rotor I and an auxiliary screw rotor II are opposite; the main screw rotor I and the auxiliary screw rotor II can be meshed correctly at work; the screw rotor can form a big suction volume and a small exhaust volume in a short axial dimension, thus the inner volume ratio of the screw rotor is improved to the maximum degree. The screw rotor has the advantages of high inner volume ratio, compact structure, short axial dimension and low processing difficulty, and improves the limit vacuum degree and the pumping speed of the double-screw vacuum pump.

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 belongs to the field of vacuum-pumping equipment and provides a composite vacuum pump which comprises a pump shell, a gas inlet and a gas outlet, wherein the gas inlet and the gas outlet are formed on the pump shell; a plurality of levels of molecular drag pumps and Roots pumps, which are installed coaxially, are arranged in the pump shell; the molecular drag pumps are combined in parallel or series and are arranged at the part near the gas inlet; the Roots pumps are combined in series and are arranged at the part near the gas outlet; and the molecular drag pumps and the Roots pumps are combined in series. The composite vacuum pump provided by the invention has the advantages of high pumping speed, high ultimate vacuum, low energy consumption, small size and light weight and can also acquire clean medium vacuum and high vacuum.

The invention relates to the technical field of vacuum pumps, and in particular relates to a roots vacuum pump. The vacuum pump comprises a motor, front and back bearing cavities, a roots cavity and a gear cavity, wherein the front and back bearing cavities are located at the both sides of the roots cavity, and the gear cavity is connected with the back bearing cavity; the roots cavity is provided with an air inlet and an air outlet and is internally provided with a driving rotor shaft and a driven rotor shaft; the driving rotor shaft and the driven rotor shaft are respectively and correspondingly provided with a roots driving rotor and a roots driven rotor; one end of the driving rotor shaft is connected with the motor, and the other end of the driving rotor shaft is provided with a driving gear; one end of the driven motor shaft is provided with a driven gear which is in transmission connection with the driving gear and accommodated in a gear box; and the front bearing cavity and the back bearing cavity are internally provided with bearings and bearing support rings which are sleeved and fixed at the both ends of the driving rotor shaft and the driven rotor shaft. The roots vacuum pump has the advantages of being small in size, high in pumping speed, energy-saving, space-saving, and applicable to IC equipment.

The invention relates to a special claw type rotor profile, and belongs to the technical field of claw type vacuum pumps.The special claw type rotor profile comprises a special claw type rotor A and a special claw type rotor B which are meshed with each other and are both of a central symmetry structure; the special claw type rotor A is composed of an arc R0 curve conjugate curve A1A2, a first arc A2A3, a second arc A3A4, a first straight line A4A5, a third arc A5A6 and a second straight line A6A7, and the special claw type rotor B is composed of an arc R0 curve B1B2, a first arc conjugate curve B2B3, a second arc conjugate curve B3B4, a first straight line conjugate curve B4B5, a third arc conjugate curve B5B6 and a straight line conjugate curve B6B7.Compared with an existing single-claw rotor, on the premise that the exradius Rm is equal to the pitch radius R of the rotor, the coefficient of utilization of capacity of a pump is greatly improved by 30-50%, high pumping speed can be realized, and the special claw type rotor profile is high in practicability.

The invention discloses a TiZrVHf quaternary getter thin film. The TiZrVHf quaternary getter thin film comprises four elements, namely, Ti, Zr, V and Hf, and the atomic number ratio is (0.9-1.1): (0.9-1.1): (0.9-1.1): (0.9-1.1): (0.9-1.1). The TiZrVHf quaternary getter thin film comprises a compact layer and a prismatic layer, wherein the compact layer and the prismatic layer sequentially grow inthe inner wall of a substrate pipe. The compact layer is a thin film, has a flat surface, and has no obvious grain structure under an electron microscope. The prismatic layer is a thin film has a rough surface, and has a obvious grain structure under the electron microscope. The prismatic layer has a large surface area and a large suction area, so that the suction rate per unit area of the substrate pipeline increases significantly. The TiZrVHf quaternary getter thin film belongs to the technical field of getter thin films. The TiZrVHf quaternary getter film can be activated at low temperature, strong adhesion and long service life are achieved, the vacuum degree of a particle accelerator is effectively improved, and the secondary electron emission coefficient is reduced.

A cryopump includes a second-stage cryopanel, a radiation shield that surrounds the second-stage cryopanel and has a shield opening, and a first-stage cryopanel provided in the shield opening. The first-stage cryopanel includes a first panel provided with opening regions thereon in a first distribution, and a second panel arranged closer to the second-stage cryopanel than the first panel and provided with opening regions thereon in a second distribution different from the first distribution when viewed in an arrangement direction of the first and second panels.

The invention relates to a vacuum-pumping system for a wind tunnel body. The vacuum-pumping system includes a multi-level air cooled lobe pump assembly, a set of heat exchangers, a silencer, an overflow valve, and a check valve; the upper part of each air cooled lobe pump is provided with an air inlet, and the lower part of each air cooled lobe pump is provided with an air outlet; two sides of each air cooled lobe pump are provided with a cool air returning opening respectively, so that heat balance of a pump body can be maintained when the pump operates under a high pressure difference; when the pressure of an air inlet connected to the back end of the lobe pump system is greater than the discharge pressure of the lobe pump assembly, a part of pumped air can be directly discharged into the silencer via the overflow valve, and then is discharged into the atmosphere via the silencer; the other part of the pumped air is discharged into the atmosphere via the overflow valve and the silencer. Each vacuum heat exchanger of the system mainly includes a housing, heat exchanger tubes, and an anti-reflux valve. A PLC control technology and a frequency converter technology are adopted by the system, so that the vacuum-pumping system can automatically adjust the pumping speed according to the pressure of an entrance.

The invention relates to a heat sink wall panel for plume test, mainly consisting of a liquid nitrogen heat sink fin (1), a liquid nitrogen heat sink branch pipe (2), a liquid nitrogen heat sink branch pipe (3) and a liquid nitrogen heat sink fin (4). The liquid nitrogen heat sink is located inside the liquid nitrogen heat sink to reduce the heat load of a vacuum container to the liquid nitrogen heat sink; the liquid nitrogen heat sink directly faces to the gas in plume test ensuring high pumping speed and high plume absorption efficiency; the opening direction of the liquid nitrogen heat sink wall panel is opposite to the direction of the plume, and the plume gas can rapidly enter into the liquid nitrogen heat sink and the liquid nitrogen heat sink interlayer to reduce the plume ejection sped and improve the absorption efficiency via multiple bounce; the opening direction of the liquid nitrogen heat sink wall panel is in the plume direction and is in geometric symmetry with the opening direction of the liquid nitrogen heat sink wall panel so that the plume gas is easy to enter and difficult to come out, the capturing rate of gas is increased; gap is left between the fins so that both sides of the heat sink can absorb flume gas, thereby effectively increasing the plume absorption area; and the materials adopt stainless steel branch pipes and copper fins, thereby effectively improving the static and dynamic vacuum degree inside the vacuum container.

A spray gun for spraying paints and similar viscous media that can be propelled pneumatically, comprising a gun housing for accommodating components of the spray gun that effect propulsion, mixture and/or metering, a handle projecting from the gun housing, and a reservoir tank removably attached to the gun housing for holding the medium to be processed, with the housing of the spray gun provided with an air guidance duct through which the compressed air responsible for atomization flows to an atomizer nozzle, wherein surfaces of the air guidance duct and/or atomizer nozzle, and/or an air cap, which come into contact with the stream of compressed air, or are wetted, are provided wholly or in part with a structured surface in the form of indentations and/or protrusions worked into the surfaces.

The invention discloses an adsorbing condensing type oil vapor recovery device for effectively preventing adsorption temperature rise and an oil vapor recovery method. The device comprises an oil vapor inlet, a first valve set, an adsorption tank set, a second valve set, a clean gas exhaust port, a vacuum pump set, a first-level oil vapor condenser, a second-level oil vapor condenser, a third-level oil vapor condenser and a check valve, wherein the first valve set is composed of a gas inlet valve set under the adsorption tank set and a vacuum valve set in parallel connection with each other; the second valve set is composed of an exhaust valve set above the adsorption tank set and a blow-down valve set in parallel connection with each other; the blow-down valve set, the adsorption tank set, the vacuum valve set, the vacuum pump set, the first-level oil vapor condenser, the second-level oil vapor condenser, the third-level oil vapor condenser and the check valve are connected in turn; the check valve is connected with the oil vapor inlet; the oil vapor inlet is connected with the gas inlet valve set, the adsorption tank set, the exhaust valve set and the clean gas exhaust port in turn; a solid-liquid phase variable energy storage substance is filled into the adsorption tank set.

A manufacture method of turbine rotor for large turbomolecular pump comprises the following steps: (1) processing single-stage blades and inner core connectors by lathe and milling machine, cleaning the single-stage blades and the inner core connector, and arranging each single-stage blade on an inner core; and (2) welding by a vacuum electron beam to form an entire turbine rotor, wherein the welding depth of the vacuum electron beam is 3 to 18 mm.

A sniffer leak detector comprising a detector with a quartz window, the window being selectively permeable to a tracer gas. The quartz window is located in a suction chamber that is connected to a vacuum pump. To reduce the response time, a gas guidance plate is situated in the suction chamber, the guidance plate and quartz window together delimiting a narrow gas guidance chamber.

A refrigerator system or cryopump includes a first refrigerator having at least first and second stages, and a second refrigerator. A thermal coupling between the first stage of the first refrigerator and a cold end of the second refrigerator is restricted to maintain a temperature difference between the cold end of the second refrigerator and the first stage of the first refrigerator. The refrigerator system or cryopump also includes a radiation shield in thermal contact with the cold end of the second refrigerator, and a condensing surface, spaced from and surrounded by the radiation shield, and in thermal contact with a second stage, e.g., coldest stage, of the first refrigerator. The restricted thermal coupling can be configured to balance the cooling load on the two refrigerators.

A variable ratio drive belt system is used to drive the water pump. The variable ratio drive belt system comprises a variable pitch water pump pulley, or driven pulley, a variable pitch crankshaft pulley, or driver pulley, and a drive belt that is coupled between a water pump and an engine crankshaft. By increasing and decreasing the size of the variable pitch water pump pulley and increasing the size of the variable pitch crankshaft pulley as a function of engine speed, the water pump speed can be increased at low engine speed to provide improved coolant flow and decreased at higher engine speeds to prevent pump cavitation.