129results about How to "Reduced pressure resistance" patented technology

The invention discloses a bilateral LCC compensation network used for wireless electricity transmission and a tuning method for same and belongs to the technical field of wireless electricity transmission. A transmission circuit includes a transmitting coil 103, a first capacitor C1 whose one end is connected with the transmitting coil 103 while the other end connected with a compensation inductor, a capacitor Cf1 connected across two ends of the transmitting coil 103. And the first capacitor C1 and the compensation inductor are connected between the voltage source and the transmitting coil in series. The network also includes a receiving circuit including a receiving coil 104, a second capacitor C2 whose one end is connected with the receiving coil 104 while the other end connected with a compensation inductor, a capacitor Cf2 connected across two ends of the receiving coil 104 in parallel. And the second capacitor C2 is connected between a battery and the transmitting coil.

The invention discloses an MMC (modular multiple converter) type multi-port power electronic transformer applied to an alternating current / direct current hybrid power distribution network. The multi-port power electronic transformer comprises an input level, a middle level and an output level, and are equipped with four kinds of universal interfaces: a high-voltage alternating current interface, a high-voltage direct current interface, a low-voltage alternating current interface and a low-voltage direct current interface; the input level refers to the MMC; the middle level refers to an isolating dual active full-bridge DC / DC converter; and the output level refers to a three-phase four-wire-system full-bridge inverter. Except the basic functions of voltage transformation, isolation, energy transfer and the like as a common transformer, the transformer provided by the invention can realize access of voltages of various forms with the multiple working modes, can perform functions of power flow control, electric quality adjustment and the like; and therefore, an intelligent power distribution network interface with higher applicability is configured.

A rotary electric machine includes a stator and a rotor located in a rotatable manner relative to the stator via a gap. The stator includes a multi-phase stator winding that is held in a plurality of slots formed in the stator. The rotor includes at least one magnet section embedded therein so as to face the slots. The magnet section includes a plurality of axially laminated magnets with a skew angle which is an angle of a positional difference between the magnets. This skew angle θs is set so as to satisfy θs=kα / 2 where α is a slot pitch which is an angle between the slots, and k is a coefficient set based on: an arc ratio θa being an angle covering an area in which magnetic flux radially flows from the magnetic section; and a slot factor S being a ratio of the slots relative to the magnet section.

The invention provides an in-liquid leaking blocking agent for well drilling and a preparation method thereof. The in-liquid leaking blocking agent for the well drilling and the preparation method arecharacterized in that a main agent which is resin is optimally selected, and a latent curing agent which is of a microcapsule structure is adopted, and the problem of conflict between long construction period of the blocking resin and quick curing can be solved; an accelerant is added to adjust the curing temperature and time; a density regulating agent and a viscosity regulating agent are addedto control the density and the viscosity to be within the optimal range, so that the prepared blocking agent meets the requirements on leaking blocking and water stopping of tubular columns of a 0-150DEG C wide-temperature-range oil well; the curing well section and the curing time can be customized based on the requirement of each well; the viscosity does not obviously change under certain temperature and within certain time; the blocking agent then is quickly cured; and after being cured, the blocking agent is high in pressure intensity, tensile strength and bending strength and meets the use requirement of leaking blocking and water stopping of a composite oil well environment; in addition, the preparation technology is simple and convenient; the reaction condition are mild and easy tocontrol; and the blocking agent is high in production and popularization and application value.

In a refrigerant cycle apparatus which is operated at a supercritical pressure on a high-pressure side, for a purpose of maintaining or enhancing performances or reducing generation of clogging or a dimension of a capillary tube, a compressor has a first compression element, and a second compression element which compresses a refrigerant compressed by the first compression element, a gas phase refrigerant in an intermediate pressure receiver is sucked into the second compression element of the compressor, a liquid phase refrigerant in the intermediate pressure receiver is pressure reduced in a second pressure reducing device, and introduced into an evaporator, and the first pressure reducing device comprises a capillary tube on an upstream side of the refrigerant, and throttling means on a downstream side of the capillary tube.

The invention discloses an urban rail maglev train traction converter output device. The device comprises an inverter, an input switch cabinet and an output converting device, wherein the input switch cabinet is in circuit connection with an input end of the inverter; the output converting device is in circuit connection with an output end of the inverter; the output end of the output converting device is in circuit connection with a plurality of external motors; the inverter comprises a plurality of inverter modules; and the output converting device comprises an output transformer which is in circuit connection with the output end of the inverter and an output switch device which is in circuit connection with the output end of the output transformer. The urban rail maglev train traction converter output device is provided with a plurality of same inverter modules and reduces the capacity demand of the traction inverter, thereby reducing the weight and the volume of the inverter and being beneficial to the arrangement of equipment; the voltage resistant grade and the output current demand of an inverter power device are reduced, and the cost of a traction system is reduced; the voltage formed by combining two inverters is high, and the speed-up capability of a train high-speed section can be improved; and the redundancy and the reliability of the system are improved.

A safety mechanism for a laminate battery. An exterior case (5) consists of two molded sheets (5a) made of laminate sheets, superposed upon one another, and bonded together around the outer edges. The exterior case has a protrusion (10) that communicates with the interior of the exterior case and protrudes outwardly from one side. A safety vent (13) is made up of an exhaust hole (11) formed in at lease one of the two molded sheets (5a) in the protrusion (10), and a valve element (12) making elastic pressure contact with the edge of the exhaust hole (11) to seal it. The safety mechanism does not operate within the range of internal pressure variation during normal use, but operates reliably at a time point when a predetermined valve operating pressure is reached to release a necessary amount of gas to the outside, this valve operating pressure being within the safe range relative to the pressure resistance of the exterior case (5) made of laminate sheets. Also, the safety vent configuration enables a reduction in production cost.

The invention discloses a high-gain and ultrahigh-frequency GaN device and a fabrication method thereof. By the high-gain and ultrahigh-frequency GaN device, the problem of low frequency, gain and power conversion efficiency of an existing similar device is mainly solved. The device comprises a substrate (1), an AlN nucleating layer (2), a GaN buffer layer (3), an AlN insertion layer (4), an AlGaN barrier layer (5) and a passivation layer (7) from bottom to top, wherein a source electrode (8) and a drain electrode (9) are arranged at two ends of the GaN buffer layer, a metal interconnection layer (11) is arranged on the source electrode and the drain electrode, a self-alignment stepped dual-T-shaped electrode (10) is arranged on the AlGaN barrier layer, a groove is formed in a grid pin (101) of the grid electrode, a grid dielectric layer (6) is arranged above the groove, and the passivation layer is arranged on a surface of the barrier layer at two sides of the grid electrode pin. By the high-gain and ultrahigh-frequency GaN device, the grid electric leakage and the parasitic capacitance are reduced, the current collapse is suppressed, the power conversion efficiency and the frequency and gain characteristic of the device are improved, and the high-gain and ultrahigh-frequency GaN device can be used as a high-gain and ultrahigh-frequency device.

The invention discloses an isolated three-level bidirectional DC-DC converter with a coupling inductor. The isolated three-level bidirectional DC-DC converter comprises a high-voltage side input capacitor, a low-voltage side input capacitor, a high-voltage side power supply, a low-voltage side power supply, a first power switching tube, a second power switching tube, a third switching tube, a fourth power switching tube, a first diode, a second diode, a third diode, a fourth diode, a first coupling filter inductor, a second coupling filter inductor, wherein the first coupling filter inductor and the second coupling filter inductor are coupled to each other. The isolated three-level bidirectional DC-DC converter has the advantages of small output current ripple and low loss of switching tubes, and is also relatively simple in structure.

The invention relates to a wireless power transmission device which is composed of four coils of a transmitting coil (10), a transmitting terminal amplifying coil (20), a receiving terminal amplifying coil (30) and a receiving coil (40) which are parallelly arranged, and the four coils are all in parallel connection with variable resonance compensation capacitors ( C1, C2, C3 and C4). The transmitting coil (10) and the transmitting terminal amplifying coil (20) form a transmitter, and the receiving terminal amplifying coil (30) and the receiving coil (40) form a receiver.

The present invention provides a dry powder mortar system for external building heat insulating polystyrene board and including adhering dry powder mortar and anticracking dry powder mortar, and belongs to the field of building material technology. The dry powder mortar system has high adhesion strength, high compression strength, low heat conducting coefficient, less dry contraction deformation, excellent placeability, high water preserving property, and asy construction and transportation. It is mixture of Portland cement, flyash, quartzite, dispersive polymer glue powder, water preserving agent, composite admixture, fiber, etc. It is mixed with water in 20 wt% before being used as the adhering layer or anticracking layer for heat insulating polystyrene board.

The invention discloses an ultra-deep water-float-type ocean oil and gas development system which comprises a seaborne offloading float, a shuttle tanker, submarine floats and a mooring riser system, wherein the offloading float comprises an air compressor, a pipe cable control winch and a winch; the mooring riser system comprises a mooring system and risers; the mooring system comprises mooring cables above the submarine floats and tension legs below the submarine floats; the upper ends of the mooring cables are connected with the winch on the offloading float; and the lower ends of the mooring cables are connected with the upper parts of the submarine floats. Compared with a floating production oil storage system, the offloading float is not provided with an oil storage and oil and gas processing device, so that the oil and gas development system is small in size and light in weight, and suffers an acting force of a wind wave flow far less than that of the huge floating production oil storage system, and shelter and evacuation are not required under the once-in-a-hundred-year limit ocean condition.

The invention relates to an alternating-current saturation reactor. According to the alternating-current saturation reactor, direct current is not needed, the size is small, and the cost is low. The alternating-current saturation reactor comprises a terminal I, a terminal II, a terminal III, a closed loop iron core alternating-current coil L1 and an alternating-current saturation reactor regulator, wherein the closed loop iron core alternating-current coil L1 is connected between the terminal I and the terminal II, the alternating-current saturation reactor regulator is connected between the terminal II and the terminal III, and the alternating-current saturation reactor regulator is a voltage distribution and regulation device; when an alternating-current saturation reactor regulator control circuit does not work, the nominal voltage of the alternating-current saturation reactor regulator is obtained; when the alternating-current saturation reactor regulator control circuit works, the control circuit regulates and controls the voltages across the two ends of the alternating-current saturation reactor regulator to be lower than the nominal voltage; regulation of the reactance of the alternating-current saturation reactor regulator is achieved by regulating the alternating voltages across the two ends of the alternating-current saturation reactor regulator.

An expansion valve for a refrigerating cycle, in which the body dimensions and the weight of the whole valve can be reduced and a reduction in cost can be achieved. An expansion valve of the invention comprising a temperature-sensing portion arranged in a refrigerant passage leading to an evaporator from a gas cooler or an internal heat exchanger in a vapor compression type refrigerating cycle and varied in internal pressure according to a refrigerant temperature at an outlet side of the gas cooler or on an outlet side of the internal heat exchanger, a valve member that mechanically interlocks with a change in internal pressure of the temperature-sensing portion to adjust an opening degree of a valve port, and a body that accommodates therein the valve member, and wherein the body is provided with a flow passage, through which a refrigerant reduced in pressure by the valve member is led to the evaporator while a refrigerant temperature at the outlet side of the gas cooler or on the outlet side of the internal heat exchanger is transmitted to the temperature-sensing portion. Also, that density, at which a refrigerant is charged in a temperature-sensing body, is set in the range of about 200 kg / m3 to about 600 kg / m3. Further, a ratio of a temperature-sensing cylinder corresponding portion to the temperature-sensing body is made at least 60%.

In a relief printing plate according to an aspect of the present invention, the relief can be formed to have resistance to pressure applied to the apex thereof thanks to the depth (d) and the ridge tilt angle (x). In particular, the resistance to pressure against a relief serving as a highlight halftone dot can be improved to prevent the relief from falling over by the pressure applied to the apex of the relief. Thereby, the relief serving as a highlight halftone dot can be made not to be dipped in a cell of the ink roller (e.g., anilox roller).

A resonance eliminating method for the secondary side of an arc extinction wire includes the steps as: 1)add a secondary winding on the arc extinction wire; 2)link buffer resistance to the secondary winding and adjustable silicon trigger circuit; 3)under normal running, the adjustable silicon is conducting and the arc extinction wire runs around resonance point, and the resistance restrains neutral point voltage increase. When the system links to earth, the neutral point voltage excesses the limitation and monitored by voltage transformer which makes the adjustable silicon triggers the control circuit and shut off resistance circuit.

The invention provides a high temperature and high pressure step-by-step packing and unpacking multi-stage fracturing tubular column and an application method thereof. According to the fracturing tubular column, in the fracturing construction process, controllable packers and sand blasters which correspond to a target construction stage position and are used in a matched mode can be opened when ball fracturing is conducted only once, and the fracturing construction process can be simpler and more convenient; step-by-step packing of a packer at the fracturing construction stage position, non-packing of a packer at the non-construction stage position and step-by-step unpacking of a packer at the constructed stage position can be achieved, sealing performance of the packer at each stage can be effectively checked, times of repeated packing and unpacking of the packers is reduced, sealing efficiency of all the packers of the tubular column is improved, and after fracturing construction is ended, the tubular column is easy to pull out.

This invention relates to a radiator and its preparation method, and especially refers to a fin-pipe shaped radiator specially applied to semiconductor chilling unit and its preparation method. This radiator consists of vertical pipe and upper & lower horizontal pipe (both ends are blocked) welded into the heat radiation chamber, and the evaporator connected through pipeline with axially extending fins distributed on the external surface of the horizontal pipe and the vertical pipe in an angle “α” at the joint within the range of 0°<α≦90°. The main components are manufactured into sections by extruding, punching or other machining techniques and then soldered into a radiator. It has overcome the disadvantages of various and numerous welding points, complicated techniques and so on in existing manufactures, and has realized an industrialized batch production upon simple and reliable techniques.

The invention discloses a heat exchanger core used for heat exchange between three fluids and belongs to the technical field of mechanical design. The heat exchanger core includes two cover plates, afirst etched plate, a second etched plate, a forming plate and a partition. The forming plate and the partition form a structural unit A, and the first etched plate and the second etched plate form astructural unit B. The structural unit A and the structural unit B are alternately overlaid between the two cover plates. The two cover plates, the first etched plate, the second etched plate, the forming plate and the partition are machined to be a whole. The heat exchanger core integrates the characteristics of a microchannel heat exchanger and a plate heat exchanger, simultaneous heat exchangebetween the three fluids can be achieved, and the use conditions that the working medium cleanliness is not high can be met.

The invention discloses a toilet seat purifier, which comprises the following parts: cleaning nozzle which blows off cleaning water to cleaning object position; cleaning water supply circuit; magnetic valve for switching cleaning water supply circuit; electric flow control valve for controlling cleaning water flow; silver ion electrolyser which produces silver ion during cleaning water; downstream side of magnetic valve which connects to electric flow control valve; downstream side of electric flow control valve which connects to silver ion electrolyser. The invention reduces the water pressure of silver ion electrolyser to reduce the price of silver ion electrolyser and toilet seat purifier.

An arc-shaped stepped magnetic fluid sealing device comprises a casing, a sealing assembly and an end cover. The sealing assembly comprises a shaft, a permanent magnet, a first pole shoe and a second pole shoe. Inner walls of the first pole shoe and the second pole shoe are both arc-shaped faces inclined towards the side where the permanent magnet is located. A sealed cavity with a larger middle and two smaller ends is enclosed by the inner wall of the first pole shoe, an inner wall of the permanent magnet, and the inner wall of the second pole shoe. A portion of the shaft that is located inside the sealed cavity matches the sealed cavity in shape. Inner walls of the first pole shoe and the second pole shoe are respectively provided with first pole teeth and second pole teeth.

The invention provides a double-channel fuel nozzle with an adjustable valve. The double-channel fuel nozzle comprises a nozzle shell of a T-shaped structure, an oil distribution disc, a valve deviceand a valve plug used for fixing the valve device, wherein an oil inlet hole, a valve cylinder and a valve plug hole are sequentially formed in the horizontal section of the T-shaped structure of thenozzle shell of the T-shaped structure; the oil distribution disc, the valve device and the valve plug are sequentially arranged in the valve cylinder in the direction of the valve plug hole; the valve cylinder comprises a main oil cylinder and an auxiliary oil cylinder which are sequentially arranged in the direction of the valve plug hole; a spray head is arranged at the end, away from the horizontal section of the T-shaped structure, of the vertical section of the T-shaped structure of the nozzle shell of the T-shaped structure; and the valve device is of a bidirectional adjustable structure. According to the double-channel fuel nozzle, the valve device capable of being adjusted in two directions is arranged in the valve cylinder in the nozzle shell, and therefore the problems that thepressure bearing performance of the valve is reduced after the valve is used for a long time, a spring or an adjusting gasket needs to be replaced again, operation is troublesome, and time and labor are wasted are solved.

The invention discloses a novel heat exchanger core and belongs to the technical field of mechanical design. The heat exchanger core includes two cover plates, an etching plate piece, a forming platepiece and partition plates. The forming plate piece and the partition plate form a structural unit. The structural unit and the etching plate piece are alternately overlaid between the two cover plates, the non-etched surface of the etching plate piece is in butt joint with the forming plate piece, the etched surface of the etching plate piece is in butt joint with the adjacent structural unit, the partition plates are arranged between the cover plates and the etching plate piece, and the partition plates are arranged between the cover plates and the forming plate piece. The cover plates, theetching plate piece, the forming plate piece and the partition plates are machined into a whole. The novel heat exchanger core integrates the characteristics of a microchannel heat exchanger and a plate heat exchanger and can meet the use conditions that the working medium cleanliness is not high, and the novel heat exchanger core is particularly suitable for natural gas cooling processes of an offshore work platform.

The invention discloses a modified BaTiO3 / PI dielectric energy-storing three-layer composite film and a preparation method thereof. The modified BaTiO3 / PI dielectric energy-storing three-layer composite film is composed of an upper layer, a lower layer and a middle layer, wherein the upper and lower layers are made of a PI composite material filled with BaTiO3 nanoparticles, and the middle layer is made of a pure PI material. The method employs an in-situ polymerization process and a coating process to prepare the modified BaTiO3 / PI three-layer composite film. Experimental results show that the composite film has excellent dielectric comprehensive properties, high breakdown field strength and energy storage density, so the composite film has great application prospects in the fields of capacitors and accumulators.

A liquid sealing device with a controllable sealing gap belongs to the field of mechanical engineering sealing. It solves the problem that the existing magnetic liquid sealing device has a large diameter and a large temperature difference, and the sealing gap changes due to the thermal expansion and contraction characteristics of the material, which seriously affects the performance of the sealing device. The device is composed of a magnetic liquid sealing assembly, a spring (3), a spring base (2) and the like. The inner surface of the pole piece is parallel to the outer surface of the truncated portion of the shaft sleeve (11) and intersects with the axis of the rotary shaft (13). There is an axial clearance H between the end cover (9) and the housing (1): tighten the screws on the end cover (9), the axial clearance H becomes smaller, and the pole piece and the permanent magnet (6) are aligned axially as a whole. Move to the left, the sealing gap becomes smaller; when the screw on the end cover (9) is loosened, the axial distance H becomes larger, and the pole piece and the permanent magnet (6) move along the axial direction as a whole under the elastic force of the spring (3). Moving to the right, the seal gap becomes larger. Adjust the screw on the end cover (9) to adjust the size of the sealing gap.