311results about How to "Reduce leakage loss" patented technology

A Theoretical Overlay Photographic (TOP) alignment method uses the overlay of a theoretical projected image of a perfectly aligned concentrator on a photographic image of the concentrator to align the mirror facets of a parabolic trough solar concentrator. The alignment method is practical and straightforward, and inherently aligns the mirror facets to the receiver. When integrated with clinometer measurements for which gravity and mechanical drag effects have been accounted for and which are made in a manner and location consistent with the alignment method, all of the mirrors on a common drive can be aligned and optimized for any concentrator orientation.

An optoelectronic device includes a planar active element, a vertical waveguide surrounding the active element in the vertical direction, and a lateral waveguide comprising at least one active section and at least one filter section following each other in the longitudinal direction. At least part of the active element within the active section generates optical gain in response to above-threshold pumping. The broad lateral waveguide in the active section can localize multiple lateral optical modes. In the filter section, no lateral confinement is provided for the lateral optical modes. The device further comprises means to ensure low absorption loss in the filter section and, therefore, ensure high efficiency. In one embodiment low absorption loss is achieved by pumping of at least part of the active element within the filter section. In another embodiment, the active element has small overlap with the vertical optical modes.

A first stage blade of a two-stage high pressure turbine includes an airfoil having a profile substantially in accordance with at least an intermediate portion of the Cartesian coordinate values of X, Y and Z set forth in Table 2. The X and Y values are distances, which when smoothly connected by an appropriate continuing curve, define airfoil profile sections at each distance Z. The profile sections at each distance Z are joined smoothly to one another to form a complete airfoil shape.

The invention relates to an optical fiber employable in an optical communication system using Raman amplification and adapted to improve OSNR and suppress bending loss at the same time, and the like. The optical fiber is a silica-based optical fiber having a depressed refractive index profile constituted by at least a core, an inner cladding having a low refractive index, and an outer cladding, an effective area A_eff of 110 μm² or more at the wavelength of 1550 nm, and a fiber cutoff wavelength λ_C of 1.3 μm or more but 1.53 μm or less. The depressed refractive index profile is designed such that the ratio Ra(=2b/2a) of the diameter of the inner cladding to the diameter of the core is 2.5 or more but 3.5 or less and that the relative refractive index difference Δ⁻ of the inner cladding with respect to the outer cladding is at least the relative refractive index difference Δ⁻_min where the bending loss at the wavelength for use is minimized but not exceeding (Δ⁻_min+0.06) %.

A compact, efficient, reliable, low-cost pump system having an energy recovery apparatus is provided for a large capacity desalination plant using a reverse osmosis membrane. The pump system in a desalination plant using a reverse osmosis membrane, the system includes a seawater pressurization pump and an energy recovery apparatus that recovers energy from high-pressure concentrated waste water through the reverse osmosis membrane to use the energy as a driving force for the pressurization pump. Hydro turbine impellers and pump impellers are disposed opposite each other coaxially with a pump shaft of the pressurization pump to reduce an axial thrust. A thrust direction of the shaft is supported by a single axial thrust support device. A radial direction of the shaft is supported by multiple radial submerged bearings.

The invention provides a multi-cylinder two-stage variable-capacity compressor system. The multi-cylinder two-stage variable-capacity compressor system comprises a compressor in which a plurality of sets of rotating type compression mechanism parts are contained, wherein the compression mechanism parts comprise at least one high-pressure-stage rotating type compression mechanism part and at least two low-pressure-stage rotating type compression mechanism parts; one compression mechanism part in the low-pressure-stage compression mechanism parts is provided with a variable-capacity switching mechanism and further comprises an intermediate communicating pipeline introducing air suction pressure or intermediate pressure of the compressor to the variable-capacity switching mechanism. Air suction pressure or intermediate pressure is introduced to the variable-capacity mechanism by the multi-cylinder two-stage variable-capacity compressor so that the running modes of the variable-capacity compressor can be changed, the front and back pressure difference (between the head and the tail of a pin nail) of the variable-capacity mechanism is reduced, leakage loss caused by pressure difference is reduced, and the running efficiency of the compressor can be improved. The invention further relates to a control method of switching of running modes of the multi-cylinder two-stage variable-capacity compressor system.

The invention provides a dual-cylinder rotating close-type compressor comprising an electromotion element being held at the upper part of a close housing; a compression mechanism section being held at the lower part of the close housing and comprising an upper bearing, an upper cylinder, a central clapboard, a lower cylinder and a lower bearing, and being driven by the electromotion element via a crankshaft; the upper transfixion bolts for fixing the upper bearing, the upper cylinder, the central clapboard to the lower cylinder from the upper bearing side; and lower transfixion bolts for fixing the lower bearing, the lower cylinder, the central clapboard to the upper cylinder from the lower bearing side, and in addition, at least two lower transfixion bolts and two lower transfixion bolts are alternately arranged along the circumferential direction of the crank shaft rotation direction.

The invention belongs to the technical field of hydraulic control and particularly relates to a hydraulic control system of a novel bending machine, i.e. a servo pump control system. The hydraulic control system comprises a motive power source and a control valve group, wherein the motive power source is connected with a numerical control system. The hydraulic control system is characterized in that the motive power source comprises a servo motor, a bidirectional quantitative pump and an oil tank, the bidirectional quantitative pump and the oil tank are connected with the servo motor, the control valve group comprises a shuttle valve, a pressure valve, an unloading valve, a one-way valve, a reversing valve, a back pressure valve, a poppet valve, a safety valve and a liquid filling valve, the pressure valve is used for regulating the system pressure, an oil inlet and outlet of the bidirectional quantitative pump is controlled by the shuttle valve, a positive oil outlet is directly connected with an upper cavity of an oil cylinder, a reverse oil outlet is connected with a lower cavity of the oil cylinder through the poppet valve and the back pressure valve, an oil inlet and outlet of the bidirectional quantitative pump is connected with the oil tank through the one-way valve, the reversing valve and the liquid filling valve, the liquid charging valve is connected with the control valve, and the safety valve is connected between the oil tank and the lower cavity of the oil cylinder. The hydraulic control system has the characteristics that efficiency is high, the energy is saved, and the synchronous precision is high.

To stabilize the pressure of a back pressure chamber arranged on the back face of a cyclone component to reduce variation of a force for pushing one cyclone component against the other cyclone component so as to implement high efficiency of a cyclone compressor. On the root of teeth of one cyclone component, a compression chamber side communication port of a back pressure communication channel is arranged at a position facing to the compression chamber of two systems, and the internal line of the cyclone component equipped with the compression chamber side communication port is of a tooth shape that the compression of the compression chamber is performed in advance. Thereby, the variation amplitude of the pressure in the compression chamber communicated with the compression chamber side communication port is reduced, and the variation amplitude of corresponding back pressure is reduced. By means of restraining the variation of the back pressure, the deformation variation of the cyclone component is restrained; leakage loss is reduced by improving sealability of the clearance between two cyclone components, such that a total adiabatic efficiency is improved by restraining interference and reducing friction loss.

The invention discloses a casing structure with leaf apex interval control and leaf tip flow control. A turbine casing and an impact plate form a first cavity, multiple impact holes are limited in the impact plate, a turbine outer ring form a second cavity, multiple turbulent structures, and an air film hole structure and a leak-proof structure are limited on the outer ring; cold air flow enters the first cavity through an air incoming hole, enters the second cavity through an impact hole structure to impact the outer ring, fully cools the turbine outer ring through the turbine structures and flows out from the air film hole structure of the outer ring to form a cooling air film to be finally mixed with main fuel gas; a boss structure on the turbine outer ring is mainly used for blocking formation and development of leaf tip leakage vortex. Heat exchange effect of cooling airflow inside the casing is enhanced, the air film hole structure has good cooling effect on the surface of the turbine casing and a leaf tip position in direct contact with high-temperature fuel gas, the leakage-proof structure effectively lowers leaf tip leakage loss, and turbine efficiency is improved.

The invention discloses a control method for efficiently and quickly starting an engine. The engine applies a solenoid-driven inlet valve and a solenoid-driven exhausting valve, and is subjected to positioning and electric current double closed-loop feedback control by an engine electric control unit, so as to achieve the independent, continuously variable and real-time regulation of the opening moment, the closing moment, the lift range and the motion rule of the inlet valve and the exhausting valve of the engine; as in the process that the rotational speed of the engine rises step by step, the inlet valve basically keeps an opening state and stops the oil spraying and the ignition of each cylinder until a set rotational speed is reached, under the same power of a starting motor, the transition time can be obviously shortened; and the energy-saving performance and the environment-friendly performance of the engine can be improved.

The invention relates to a gain photon crystal optical fiber waveguide, which is composed of a core layer and a coating layer which surrounds the core layer. The inner coating layer of the optical fiber comprise solid microstructure point lattice which is formed by germanium-doped silica column, and forms outer bandgap of the gain optical fiber, the function thereof is that the multimode pump light can be strictly restricted in a second fiber core region which is provided with rare earth dopant ion, and improves the utilizing efficiency of the pump light; the second fiber core of the optical fiber is composed of the solid microstructure point lattice which is formed the rare earth ion silica column to form the inner bandgap of the gain optical fiber, the function thereof is that through the multimode pump light, the generated laser light can be strictly restricted in a first fiber core region which is formed by high pure silica glass. Adopting the solid gain photon crystal optical fiber can greatly improve the utilization efficiency of the pump light, improve beam quality of output laser light, enhance output power of the optical fiber laser, and reduce nonlinear effect of the high-power laser device.

The invention provides a double-rotor variable-volume compressor, comprising a first air cylinder group and a second air cylinder group. The first air cylinder group comprises a first air cylinder, a first sliding sheet and a locking mechanism, wherein the first air cylinder is provided with a first sliding groove; the first sliding sheet is arranged in the first sliding groove and is provided with a positioning hole or a positioning groove; the locking mechanism is provided with a locking piece; the locking piece is provided with a locking position and an unlocking position, wherein the locking position extends into the first sliding groove and is matched with the positioning hole or the positioning groove so as to lock the first sliding sheet, and the unlocking position is used for unlocking the first sliding sheet. The double-rotor variable-volume compressor provided by the utility model can convert between single-cylinder operation and double-cylinder operation, and has higher operation stability and reliability. Meanwhile, a sliding sheet of a second air cylinder is not stressed by a pull force towards the outer side of the air cylinder in the double-cylinder operation, so that the sliding sheet is tightly adhered to a roller; the leakage loss and the like can be reduced; and the properties of the compressor can be improved.

The invention discloses an integrated type energy-saving and environment-friendly hydraulic servo system, and belongs to the technical field of machinery assemblies. The integrated type energy-saving and environment-friendly hydraulic servo system comprises a computer, a data collecting part, a power output control part, a one-way valve set, a connecting block and an executing unit. The data collecting part comprises a force sensor, a pressure sensor and a temperature sensor. The power output control part comprises a hydraulic pump, a servo motor and an oil tank. The one-way valve set comprises a first one-way valve and a second one-way valve. An oil channel is placed inside the connecting block. A hydraulic cylinder is adopted in the executing unit, and is composed of a pressurizing cavity, a pressure releasing unit and a piston rod. The computer is connected with the force sensor, the pressure sensor and the temperature sensor. The servo motor is connected with the computer and the hydraulic pump, the hydraulic pump is installed inside the oil tank, and the servo motor is installed outside the oil tank. The oil tank is fixedly connected with a hydraulic cylinder body through the connecting block in a sealing mode, the hydraulic pump is communicated with the hydraulic cylinder through the connecting block, the oil inlet ends of the one-way valves are communicated with the oil tank, and the oil outlets of the one-way valves are communicated with the hydraulic pump.

The invention provides a supercritical carbon dioxide closed type circulating turbine compressor which comprises a power generation assembly unit, a gas compressor impeller, a turbine, a gas compressor end shell and a turbine end shell. The power generation assembly unit, the gas compressor turbine and the turbine are sequentially arranged coaxially and located in a cavity formed by the gas compressor end shell and the turbine end shell in a closed manner. The gas compressor impeller and the turbine are integrated and arranged in a back-to-back manner. The supercritical carbon dioxide closed type circulating turbine compressor is located in the closed space, and the leakage loss is reduced. The gas compressor impeller and the turbine are integrated and arranged in a back-to-back manner, and the structural strength is good.

The invention relates to an abrasive single-crystal turbine blade, in detail, relates to a turbine blade (1) used for a turbine rotor (2).A turbine blade for a turbine rotor, is provided having a single-crystal basic body which has a blade tip and extends in the radial direction. The turbine blade includes at least one oxidation-resistant intermediate coating, which is applied by laser metal forming and is epitaxially bonded to the basic body, is arranged on the radially outer blade tip, and in that an at least single-layer, wear-resistant and oxidation-resistant coating, which is applied by laser metal forming and consists of oxidation-resistant binder material and abrasive particles embedded therein, is arranged on at least certain regions of said epitaxial intermediate coating.