76results about How to "Eliminate dead zone" patented technology

The invention relates to a low mains voltage fully differential rail-to-rail amplifying circuit in the technical field of integrated circuits, which comprises NMOS transistors with normal threshold, such as MN1, MN2, MIN, MAN1, MAN2 and MLN1 to MLN7, and PMOS transistors with normal threshold, such as MP1, MP2, MIP, MAP1, MAP2 and MLP1 to MLP7. Other than MLP2 and MLP3, a low power supply VSS and a high power supply VDD are connected with the substrate ends of other NMOS transistors and PMOS transistors respectively. The circuit adopts a pair of the PMOS transistors and a pair of the NMOS transistors to carry out differential input and adopts a pair of additional PMOS transistors and a pair of additional NMOS transistors to carry out current compensation, thus allowing the fully differential rail-to-rail amplifying circuit to have constant current. A voltage shift circuit is used for eliminating dead zones within the input common-mode range under low mains voltage so as to realize the rail-to-rail input under the low mains voltage.

The invention discloses a double-motor backlash eliminating control device for an alternating current servo system, and relates to the technical field of mechanical control. The radial direction of a main gear is symmetrically meshed with two same pinion gears which are respectively connected with a group of same pinion gear transmission device; the two groups of pinion gear transmission devices are respectively connected with output ends of two groups of same first motor and second motor; the first motor and the second motor are respectively connected with a group of alternating current driver comprising a speed ring and a current ring; and a backlash eliminating control circuit is connected between the two groups of alternating current drivers. The double-motor backlash eliminating control device achieves the aim that the two alternating current servo motors have equal output torque, stable performance and energy conservation and overcome the defects of direct current motors.

An ink jet head unit comprises a head (2) in which plural nozzle arrays (2a, 2b, 2c, 3d) of which each comprises many nozzle holes are formed, and ink is ejected from the nozzle holes; a head base on which the head (2) is mounted; and flat cables (4a, 4b) flexibly formed by covering many transmission wires with an insulation film, of which one end sides where the transmission wires are exposed are fixed, in mounting parts (7a, 7b) interposed between the nozzle arrays (2a, 2b) and the nozzle arrays (2c, 2d,) onto the head(2) thereby to transmit ink ejection signals for driving the head.

The invention relates to a fluidized bed reactor for preparing chlorosulfonated polyethylene by a gas-solid method. The fluidized bed reactor comprises a main body of the fluidized bed reactor, wherein the main body of the fluidized bed reactor comprises a straight tube section and a reactor expansion section; the top end of the straight tube section is connected with the bottom end of the reactor expansion section; the inner diameter of the reactor expansion section is larger than that of the straight tube section; a gas premixing chamber is formed at the bottom of the main body of the fluidized bed reactor; a predistribution device is arranged at the bottom of the inner wall of the gas premixing chamber; a plurality of layers of gas distribution plates are arranged between the gas premixing chamber and the main body of the fluidized bed reactor; an ultraviolet lamp glass tube stack formed by annularly arranging a plurality of glass tubes is arranged in the center of the straight tube section, or a plurality of holes are equidistantly and radially formed in the inner wall of the straight tube section along the circumference; and the glass tubes are arranged in the holes. The fluidized bed reactor has the advantages of effectively preventing particles close to the wall surface from being adhered on the wall surface or settled; eliminating dead zones of the whole fluidized bed layer; making reactions more uniform because reaction materials in the bed layer are sufficiently irradiated by ultraviolet.

The invention discloses compound smelting equipment ultrasonically stirring low-melting-point alloy, which is applicable for the smelting and preparation of the low-melting-point alloy, in particular to various tin-bismuth series alloy at the low melting point of below 300 DEG C. The equipment comprises a crucible, a heat-preservation and heating device, a temperature control device, an ultrasonic stirring device, an ultrasonic wave generation and control device and a mechanical stirring device, wherein molten metal is put in the crucible. The equipment is simple in structure and practical; the mechanical stirring device and the ultrasonic stirring device are mutually perpendicular without intervention; ultrasonic waves are imported to the molten metal from the side of the crucible; the efficiency is high, the ultrasonic energy loss is low, and moreover, the solid rate of the molten metal is higher; even when metal stirring fails, the ultrasonic waves still can be applied till metal solidification; through the compound ultrasonic and mechanical stirring, grains can be refined, so that a non-dendritic structure is obtained; homogenizing of the ingredients and the temperature of the fused molten metal is sped up; the plasticity of prepared alloy is improved greatly in comparison with the plasticity of alloy prepared by a traditional method.

The present invention relates to a buck type single-stage LED drive circuit of a unity power factor, and discloses the buck type single-stage LED drive circuit of wide input voltage range and low THD and unity power factor. A forestage circuit adopts a time division multiplexing buck circuit and a buck-boost circuit to be integrated with a back-stage flyback convertor, so that an inherent dead zone of a conventional buck type PFC circuit AC input current is eliminated, and accordingly, the THD of the input current is reduced. By the staged working, the circuit can work in a buck mode and also can work in a buck-boost mode. A buck-boost switching tube works when an input voltage is less than an output voltage, so that the conduction dead zones can be reduced. Meanwhile, two switching tubes in the circuit are in common ground, so that the design of a driving control circuit is simpler, and the unity power factor is realized.

The invention discloses a variable-topology Trans-Z-source inverter, which comprises a first Trans-Z-source network, a second Trans-Z-source network, a first DC power source, a second DC power source, a first full-bridge inverter, a second full-bridge inverter, a first filtering inductor, a first AC power source, a ninth switch tube, a tenth switch tube, a ninth diode and a tenth diode. The first Trans-Z-source network is connected in parallel between the first full-bridge inverter and the first DC power source; the second Trans-Z-source network is connected in parallel between the second full-bridge inverter and the second DC power source; and the first DC power source and the second DC power source are connected through the ninth switch tube, the ninth diode, the tenth switch tube and the tenth diode. The Trans-Z-source inverter can eliminate dead zones, realizes single-stage boosting, realizes any multiple of boosting under the condition of small shoot-through duty ratio, can realize switching of two modals and realizes improvement of efficiency.

A dish washing machine having a structure allowing wash water to be evenly sprayed into a washing tub. The dish washing machine includes a cabinet forming an external appearance of the dish washing machine, a washing tub arranged in the cabinet and allowing dishes to be washed therein, a dish basket arranged in the washing tub to accommodate the dishes, a spray unit to spray wash water into the washing tub, a diversion unit arranged inside a flow passage of wash water to divert the wash water sprayed from the spray unit, and a guide member coupled to one side of the diversion unit to allow the diversion unit to move within the washing tub. As the spray unit and the diversion unit are provided, a dead zone which wash water does not reach may be eliminated, and divided and intensive washing may be implemented in the washing tub.

A contactless communication medium includes: a base material made of an insulating material; an antenna coil portion formed by winding a conductor in a plane on the base material; a capacitor connected to the antenna coil portion; a communication processing section connected to the antenna coil portion and the capacitor to perform a contactless communication process; and a metal pattern having a predetermined area and disposed in a region surrounded by the antenna coil portion, the metal pattern being not electrically connected to the antenna coil portion or the capacitor.

A ventricular-assist-device valve includes two flaps hinged to a peripheral wall by means of a couple of flexible struts. As each flap opens and closes during each cycle of operation, the struts flex and open passages for flow around them, around the flaps, and between the struts and the flaps, so as to prevent the formation of dead zones that contribute to the accumulation and deterioration of blood cells that produce clotting. The struts are tensioned so as to exert a pressure against the flow of the blood stream when the flaps are open. This tension creates a pressure differential between the underside and the peripheral regions of the flaps that forces blood flow around the hinges and washes out stagnant cells. As a result, clotting is materially reduced.

The invention relates to a method for determining the dead zone of a proportional control valve (8) used for controlling an actuator of a rock drilling device, the method comprising controlling the control valve (8) with an electric P controller (12) and measuring the position of the actuator in a coordinate system representing its movement with a separate position detector. The dead zone is determined by means of a product of the P controller of the control valve (8) and the difference value.

The invention relates to a wireless power transmission device, which comprises a transmitting terminal and a receiving terminal, wherein the transmitting terminal comprises at least three concentric transmitting coils and a rotating mechanism for driving the transmitting coils to transversely rotate; the at least three concentric transmitting coils are located in XOY, XOZ and YOZ planes of a three-dimensional coordinate system; the transmitting terminal further comprises a power supply input module, a main control module and a signal receiving module; the power supply input module is arranged on the rotating mechanism; the main control module is used for controlling the transmitting terminal to rotate and to process a signal; an output end of the power supply input end is connected with the input ends of the transmitting coils; the main control module and the power supply input module are interactive connection; and the output end of the signal receiving module is connected with the input end of the main control module. Wireless power transmission can be carried out in a random direction within a three-dimensional space through the transmitting coils with the transmitting terminal structures; and wireless power transmission can also be simultaneously carried out on a plurality of loads which are placed in different directions in the area.

The invention relates to a pneumatic stirring mixing sludge automatic reflux domestic sewage purification treatment device. The pneumatic stirring mixing sludge automatic reflux domestic sewage purification treatment device comprises an inner cylinder and an outer cylinder; the inner cylinder is a water inlet tank; the space between the inner cylinder and the outer cylinder is divided into an anaerobic tank, an anoxic tank, an aerobic tank, a precipitation tank, a dosing tank and a clean water tank sequentially by partition plates; to-be-treated sewage enters the water inlet tank from the topend; a water inlet in the lower end of the water inlet tank is communicated with the anaerobic tank and the water inlet is formed in one end far away from the anoxic tank; the anaerobic tank, the anoxic tank, the aerobic tank, the precipitation tank, the dosing tank and the clean water tank are communicated with each other sequentially in a fold line manner according to the sequence of bottom, topand bottom; the top of the clean water tank is connected with a water outlet pipeline; the top of the anaerobic tank is sealed and connected with an air-blowing port; and a U-shaped pipe is arrangedon the inner cylinder between the water inlet tank and the anaerobic tank. A gas pump blows air into the anaerobic tank to descend the water level of the anaerobic tank, and the U-shaped pipe releasesenergy to realize stirring and mixing of the anaerobic tank and the anoxic area as well as refluxing of anoxic sludge towards the anaerobic tank, so the denitrification effect of a small sewage purification tank is improved, and the purification and treatment speed of the sewage is increased; and the device is not provided with a power stirring facility, so the device is simple to operate and maintain and convenient to apply and popularize.

The invention relates to a castable for a slag line brick. The castable comprises the following components in percentage by weight: 36.42-39.41% of 3-6mm magnesite, 35.37-40.62% of 0-3mm magnesite, 7.67-8.36% of fine magnesite powder, 1.38-1.97% of aluminium oxide, 0.01-0.03% of boron carbide, 11.73-12.83% of graphite and 2.63-3.41% of resin. The castable has the advantages that: the castable for the slag line brick is synthesized from 3-6mm magnesite, 0-3mm magnesite, fine magnesite powder, aluminium oxide, boron carbide, graphite and resin in a mixing manner; the produced slag line brick has good thermal shock resistance and optimal hot strength at working temperature, and is capable of effectively absorbing Al2O3 in occluded foreign substances, so as to form spinelle on the surface; and the castable has the characteristics of low cost and long service life, is capable of effectively removing a dead zone in a bottom region and improving the flow track of molten steel, and is beneficial to absorption of slag.

A novel hexagonal opening-closing shell-type electrode semiconductor detector comprises a hexagonal prism type semiconductor substrate. A central cylindrical electrode is right in the middle of a trench electrode. The trench electrode is a hexagonal frame type hollow electrode. The trench electrode is etched into two sections which are of the same structure and mutually complementary in structure. Sloping grain-shaped entity gaps are arranged right in the middle of a pair of parallel sides of the trench electrode. The trench electrode and the central cylindrical electrode on the top of the novel hexagonal opening-closing shell-type electrode semiconductor detector are covered with an electrode contact layer. The other semiconductor part on the top is covered with a silicon dioxide insulation layer. A silicon dioxide substrate layer is arranged on the bottom. The parts, not etched into an electrode, of the trench electrode form the sloping grain-shaped entity gaps. According to the novel hexagonal opening-closing shell-type electrode semiconductor detector, a circle is made with the vertex of the trench electrode as the center and the width of the sloping grain-shaped entity gaps as the radius on the basis of a sloping grain-shaped semiconductor substrate, the semiconductor matrix outside the arc is etched into an electrode, and the sloping grain-shaped semiconductor substrate is left. Thus, the performance of the detector is improved.

The invention relates to a multi-layer drop tube type falling film polycondensation reactor. The polycondensation reactor mainly comprises an outer tower and a plurality of tower cores arranged sequentially from top to bottom, wherein each tower core comprises a tower plate and a plurality of falling film drop tubes arranged side by side; each falling film drop tube comprises a hollow pipe and a plurality of drop sleeves fixed on the outer side wall of the hollow pipe; each drop sleeve comprises an upper separation sleeve and a lower separation sleeve. Depending on the action of gravity of materials, a very large gas-liquid phase interface is formed on the falling film drop tubes, and removal of small molecules is facilitated; when fluids pass through each pair of separation sleeves on each falling film drop tube, the fluid in an internal wall surface area and the fluid in a surface area exchange, and a good surface renewal effect is realized to increase the mass transfer rate. The reactor is simple in structure and high in surface renewal rate and has very large gas-liquid interface; the flow is large, and retention time is controllable; reaction energy consumption is low, and externally added power equipment is avoided.

The invention relates to a flue gas distributor in a flue gas desulfurizing device. The flue gas distributor comprises a plurality of conical barrels with unequal maximum diameters. The smaller upper end of the conical barrel is communicated with a flue gas inlet pipe through a section of bend pipe. The larger lower end of the conical barrel is communicated with a desulfurizing tower. The conical barrels are sleeved according to the dimension of the maximum diameter. The center line of the conical barrel with the smaller maximum diameter shifts a distance relative to the center line of the conical barrel with the larger maximum diameter. The shift direction is closed to one side of the bend pipe with a larger bend radius. The invention can make the gas and the desulfurizer distribute uniformly in the desulfurizing tower and has the simple structure, easy maintenance, low wearing degree, no flow dead area and small pressure loss.

The invention relates to a distribution network fault self-healing dead zone elimination method based on a feeder protection simulation principle, which belongs to the technical field of power system relay protection. After a fault happens in the dead zone, a feeder protection simulation device acquires feeder protection action information in a fault point upstream substation, the first FTU (Feeder Terminal Unit) on the feeder acquires current information at the downstream of the fault point, the current information at the upstream and the downstream of the fault point is interacted through real-time communication between the two, and the first FTU on the feeder judges whether a fault happens to the dead zone; and if the fault happens to the dead zone, the first FTU on the feeder controls the first feeder sectioned switch to be cut off, a fault section is isolated, the dead zone is eliminated, a loop FTU controls a loop switch to be closed to restore power supply in a non-fault section. By using direct interaction between the feeder protection information in the substation and the feeder terminal unit information, the dead zone is eliminated, and the feeder power supply reliability is greatly improved.

The invention discloses a method and a device for improving the primary conversion rate of methanol in synthesized chloromethane. The method for improving the primary conversion rate of methanol in synthesized chloromethane comprises the following steps: 1) adding hydrogen chloride gas, methanol and a high-temperature catalyst solution into an ejector to obtain a reaction fluid; and 2) pressurizing the reaction fluid by an ejector, ejecting the pressurized reaction fluid via the ejector, and allowing the ejected reaction fluid to enter a reactor through a feed distribution pipe for a reaction.Meanwhile, the invention also discloses the device for improving the primary conversion rate of methanol in the synthesized chloromethane. By using the treatment method, the primary conversion rate of methanol can be improved, so the productivity of a chloromethane synthesis device is further improved, and the unit consumption of methanol is reduced.