48results about How to "Symmetrical distribution" patented technology

A bone screw having a threaded shaft 15 which has a thread having an outer diameter DA, a frontal thread end and a thread profile. The thread profile has a frontal thread flank which is directed towards the frontal thread end 4, a rear thread flank 18 and a flank angle δ. The thread is multipath, preferably a double path thread where each thread path has a blade-type element with a cutting edge on the frontal thread end. The bone screw 1 also has a longitudinal axis 2. For accommodating a guide wire, the bone screw 1 is provided with a central borehole 9, which is coaxial with its longitudinal axis 2.

The invention discloses a multi-degree of freedom electromagnetic damper which belongs to the technical field of motors, solving the problems of the traditional electromagnetic damper of large damping force fluctuation and asymmetric distribution of generated damping force. The multi-degree of freedom electromagnetic damper mainly comprises a primary coil and secondary coils, wherein the primary coil mainly comprises a low-resistivity non-magnetic metal plate, the two-side secondary coils are distributed on the upper side and the lower side of the primary coil symmetrically, two air gaps are arranged between the primary coil and the two-side secondary coils, each-side secondary coil mainly comprises a yoke plate, (n+1) groups of X-direction excitation units and n groups of Y-direction excitation units, n is a positive integer, each X-direction excitation unit or Y-direction excitation unit comprises a plurality of strip-shaped permanent magnets which are sequentially and uniformly arranged on the flat yoke plates along the same direction, the magnetizing direction is vertical to a plane where the air gaps exist, magnetizing directions of every two adjacent permanent magnets are opposite, and magnetizing directions of permanent magnets on the two-side secondary coils corresponding to two sides of the primary coil are the same. The multi-degree of freedom electromagnetic damper is suitable for an electromagnetic damper.

The invention discloses a preparation method for decreasing sintered NdFeB declination. The preparation method includes preparing materials, performing smelting, processing powder, performing forming and performing sintering; to be specific, adding addition agent during powder processing to improve powder liquidity; increasing magnetic field intensity H during forming; reducing mold orientation length L; enlarging section area A in the vertical magnetic line direction; feeding mixture powder in a forming mold of a press; adjusting a center, on a coil pole, of the forming mold on a mold frame to allow the presses powder to stay in the center of the coil magnetic field during forming orientation pressing; by adjusting four relative parameters, the declination of the sintered NdFeB is decreased to 3 degrees from 10 degrees, use ratio of material with declination qualified is increased to 60% or above from 35%, production cost is remarkably decreased, and economic benefit is enhanced.

The invention is an inductance coupling coil, nested of two groups of involute coils, where the involute coil can be a segment of involute, or composed of inner and outer coils of an involute shape, and the two groups of involute coils are the same in shape and centro-symmetrically distributed. And the design of a completely symmetrical plane coil structure makes electromagnetic field distribution in a reaction chamber quite symmetrical, thus improving distribution uniformity of plasma in the reaction chamber so as to make etching rates of all points on the surface of a wafer closer. And an inductance coupled plasma device of this structure reduces the inductance of the inductance coupling coil, thus able to be very easy to obtain a large-area plasma and improve plasma uniformity in the large-area process. And it can improve the quality of etching wafer.

A probe for a coordinate measuring machine has a stationary first part and a second part which can move relative to said first part. The second part can be a feeler pin or a feeler pin extension of the probe. A damping member for damping vibrations of the moveable second part has a magnet arrangement for producing a magnetic field, and has a conductor element. The magnet arrangement is designed such that there is a change in direction of the magnetic field along a path of movement of the conductor element.

The invention relates to a wood drying device and drying method, in particular to a side draught fan type cabin wood drying device and drying method. In order to solve the problems that an existing wood drying production device and method waste energy, pollute environment and prolong the wood production machining period, imported wood has the large medical inspection and insect removing workloads, and an existing wood transportation ship cannot achieve the function of wood drying in the remote transportation way, the device comprises a cabin, a cabin-interior equipment bearing frame, a drying device humidity adjusting air exchange system, a wood drying medium forced circulating system, a heat exchanger system, a drying medium state monitoring sensor system and a dried wood water containing rate monitoring sensor system. The method comprises the steps of wood stacking, cabin cover closing, wood drying, drying degree detection of the wood, and drying medium state adjusting according to a detection result. The device and method are used for drying and insect removal treatment in the wood transportation process.

The invention discloses a drain plate for preparing electronic grade spun yarns. Novel drain nozzle distribution is adopted on bottom plates, so that the production efficiency is greatly improved at the same time of ensuring that the quality of products does not decline. The bottom plates of the drain plate are divided into five areas in totally same size, shape and arrangement mode, the drain nozzles of each area are arranged in a mode of fillet parallelogram array consisting of 12 columns and 17 rows, and the fillet parallelogram array is formed by respectively removing one drain nozzle on four corners from the parallelogram array consisting of the drain nozzles and provided with 200 drain nozzles. The drain nozzle fillet matrix of the novel drain plate is more symmetrical compared with the drain nozzle fillet matrix of 13 columns and 16 rows of an 800-pore drain plate, so that the glass silk distribution is more uniform in the subsequent process and the product yield is increased at the same time of ensuring the product quality. Meanwhile, the subsequent process of drain plate production is correspondingly improved.

The invention provides a base plate process system and a base plate process device, capable of making plasmas be equally distributed in space of a containing room without generating particles. The base plate process system (10) comprises three plasma process devices (13) and carrying rooms (11) for carrying in and out glass base plates (G) relative to each plasma process device (13) which has a quadrate chamber (18) for containing the base plates (G). Only lateral walls (18a) of the chambers (18) are connected with the carrying rooms (11). Carrying ports (13) communicated with the carrying rooms (11) are mounted on the lateral walls (18a). Opening parts (32) are mounted on lateral walls (18b) relative to the lateral walls (18a). The carrying ports (13) have an opening shape similar to the same of the opening parts (32).

The invention discloses a pseudo-four-degree-of-freedom parallel robot adopting vertical joints. The robot comprises a frame (1), a static platform (2), a rotation driving mechanism and a two-degree-of-freedom parallel mechanism, wherein the two-degree-of-freedom parallel mechanism comprises a parallel driving mechanism, a rotation support seat (5), a first motion branch chain, a second motion branch chain, a mobile platform (10) and a suction nozzle (11); the parallel driving mechanism comprises a first motion branch chain drive (6) and a second motion branch chain drive (8). The first motion branch chain comprises a first driving rod (7), a first driven rod (15) and a second driven rod (14); the second motion branch chain comprises a second driving rod (9), a third driven rod (13) and a fourth driven rod (12). Four-degree-of-freedom motion can be realized through three driving motors, and the manufacturing cost is greatly reduced; due to adoption of the pure parallel mechanism, the working space of the mobile platform is large, and the robot is high in motion speed, easy to control, symmetrically distributed, simple in design and easy to mount and maintain.

A semiconductor device is composed of a power supply interconnection extending from a certain starting point in a first direction and also extending from the starting point in a second direction orthogonal to the first direction, a plurality of power pads, and connecting interconnections providing electrical connection between the power supply interconnection and the power pads. The power supply interconnection, the power pads, and the connecting interconnections are arranged in a symmetrical manner with respect to a symmetry line crossing the starting point and extending in a direction at an angle of 45 degree to the first and second directions.

A magnetic resonance imaging (MRI) method and apparatus in which conductors are installed in the space between a static coil unit and a gradient coil unit to eliminate asymmetry of eddy current induced in the static coil unit. The structure permits a symmetrical distribution of eddy current when the concentric arrangement of the static coil unit and gradient coil unit has deviated. The MRI apparatus includes: a static coil unit configured to form a static field in a subject; a gradient coil unit configured to form a gradient field in the static field; and one or more conductors installed in the space between the static coil unit and the gradient coil unit, and configured to symmetrically distribute eddy current induced in the static coil unit.

A circuit breaker unit has first and second arcing contact pieces. A breaker gap is formed between the two arcing contact pieces. A switching gas channel leads to the breaker gap and guides the switching gas to a switching gas outlet opening of the circuit breaker unit. The switching gas channel is formed with first and second pipe sections that overlap each other at least in sections and have discharge openings in their cover surfaces. Continuous discharge openings in the first and in the second pipe sections are axially offset in relation to each other.

A self-drilling screw (10) has a first cutting edge (21) provided exclusively in a radially inner region of the drilling tip (12), extending at a first acute angle (α1) to the longitudinal axis (L);,and a second cutting edge (22) provided in radially outer region of the drilling tip (12) and extending at a second acute angle (α2) to the longitudinal axis (L), with a first enveloping conical circumferential surface (A1) which is defined by the first cutting edge (21) corresponding, with a maximum deviation of ±10%, to a second enveloping conical circumferential surface (A2) defined by the second cutting edge (22), and with the first acute angle (α1) corresponding, with a maximum deviation of ±5°, to the second acute angle (α2).

The invention relates to a bushing for preparing electronic spun yarns, which is characterized in that a base plate adopts a novel discharge spout distribution scheme, thereby ensuring that the quality of products is not reduced and greatly improving the production efficiency. In the invention, the bottom of the bushing is divided into 12 regions which are identical in the aspects of size, shape and distribution mode, wherein a rounded parallelogram composed of 100 uniformly distributed discharge spouts (i.e. a parallelogram composed of discharge spouts in 9 columns and 12 rows excluding 8 discharge spouts at 4 corners) is formed in each region. Compared with the 13-column and 16-row discharge spout rounded matrix of a 800-nozzle bushing, the novel bushing provided by the invention is more symmetrical, so that glass fibers can be distributed more uniformly in the subsequent process, thereby ensuring the product quality and improving the product yield. The invention also correspondingly improves the subsequent production process of the bushing.

An illumination apparatus including a light source that emits illumination light, an optical member that transmits the illumination light to externally project the illumination light, and a reflector that reflects illumination light from the light source towards the optical member, the device comprising: a drive device to drive the reflector and the light source to advance and retract in a substantially perpendicular direction relative to a light projection surface of the optical member; and a relative movement device to cause the light source to relatively move relative to the reflector in a process of driving to advance and retract by way of the drive device, wherein the relative movement device includes a straight guide member that causes the light source to move straight ahead in the substantially perpendicular direction relative to the reflector.

A self-drilling screw (10) has a first cutting edge (21) provided exclusively in a radially inner region of the drilling tip (12), extending at a first acute angle (α1) to the longitudinal axis (L), and a second cutting edge (22) provided in radially outer region of the drilling tip (12) and extending at a second acute angle (α2) to the longitudinal axis (L), with a first enveloping conical circumferential surface (A1) which is defined by the first cutting edge (21) corresponding, with a maximum deviation of + / −10%, to a second enveloping conical circumferential surface (A2) defined by the second cutting edge (22), and with the first acute angle (α1) corresponding, with a maximum deviation of + / −5°, to the second acute angle (α2).

A method of operating a mass spectrometer, comprising: generating ions from a sample; mass filtering the ions using a quadrupole mass filter having a set of selection parameters to transmit ions within at least one selected range of mass-to-charge ratios narrower than an initial range, wherein the quadrupole comprises four parallel elongate electrodes arranged in opposing pairs to which are applied RF and DC, wherein an attractive DC voltage is applied to one pair of opposing electrodes and a repulsive DC voltage is applied to the other pair; mass analysing or detecting the ions transmitted by the quadrupole mass filter; repeating the steps of generating ions, mass filtering and mass analysing or detecting multiple times; switching a configuration of the pairs of opposing electrodes to which the attractive DC voltage and the repulsive DC voltage are applied multiple times over the course of repeating the steps so that over long term operation the build-up of contamination on each pair of opposing electrodes is substantially equal; and determining mass filtering steps for which quantitative accuracy should be maintained between them and for the determined mass filtering steps maintaining the same configuration of the pairs of opposing electrodes to which the attractive DC voltage and the repulsive DC voltage are applied. The width of the selected mass range may change by not more than 10% when the ion transmission efficiency mass filter falls by 50% or more due to the build-up of contamination on the electrodes.

The invention discloses a superconducting thin film resonator. The superconducting thin film resonator is mainly used for solving the problem that an existing resonator is low in sensitivity due to the fact that effective area of the existing resonator is small. The superconducting thin film resonator consists of an open superconducting thin film outer ring (2) and a superconducting thin film magnetic flux focuser (3), wherein the open superconducting thin film outer ring (2) is arranged on a single crystal substrate (1) in a plating mode, and the superconducting thin film magnetic flux focuser (3) is arranged inside the open superconducting thin film outer ring (2). Three stepped-impedances are formed by four edges of the open superconducting thin film outer ring (2). The width of each stepped-impedance is 0.15mm-0.85mm, and the three stepped-impedances are different in width. A magnetic flux focus hole (4) is formed in the middle of the superconducting thin film magnetic flux focuser (3). A single complementation open ring (5) is arranged between the magnetic focus hole and the superconducting thin film of the superconducting thin film magnetic flux focuser. The single complementation open ring (5) is used for strengthening a magnetism gathering effect of the superconducting thin film magnetic flux focuser. Due to the fact that the single complementation open ring (5) is added, the superconducting thin film resonator has the advantages of not only strengthening coupling performance between the superconducting thin film magnetic flux focuser and a gasket of a radio frequency superconducting quantum interferometer, but also increasing effective area of the superconducting thin film resonator under the condition that system complexity is not increased, improving sensitivity of a probe of a radio frequency superconducting quantum interferometer, and being capable of being used in manufacture of the radio frequency superconducting quantum interferometer.

The invention relates to a cyclone demulsification dehydration separation device for water-containing oil liquid, which comprises a cyclone, and the opening end of a cyclone chamber in the cyclone faces an underflow pipe and is communicated with the underflow pipe through a coaxial composite curve pipe section; the large-diameter end of a concave arc transition section in the composite curve pipe section is connected with the opening end of the rotational flow chamber, the inner diameter of the large-diameter end of the concave arc transition section is equal to the inner diameter of the rotational flow chamber, the large-diameter end of a straight cone transition section is tangent to the small-diameter end of the concave arc transition section, and the small-diameter end of the straight cone transition section is tangent to the large-diameter end of a convex elliptic arc transition section. And the small-diameter end of the convex elliptic arc transition section is connected with the underflow pipe. The separation space of the cyclone is larger than that of a traditional straight-face double-cone-section cyclone and a traditional double-spherical-face smooth transition pipe section cyclone, the tangential cone angle is increased, the contact area is increased, the downward resistance of fluid is increased, a large amount of oil liquid in cyclone liquid drops is forced to migrate to an overflow opening, and the separation effect is improved. The separation effect and the separation efficiency can be obviously improved.

The invention relates to the field of oil exploration and development and particularly relates to an oil extraction underground working tool, more particularly a dual-electric pump cable penetrating packer. The dual-electric pump cable penetrating packer comprises a main joint. The lower part of the main joint is of a stepped structure and is composed of a main operation pipe hole, a deflation valve hole, a first set of cable holes, a reserved hole, a control line hole and a second set of cable holes. Six cables can penetrate the first set of cable holes and the second set of cable holes respectively. Compared with the prior art, the entire mechanism of the dual-electric pump cable penetrating packer is symmetrically distributed, thus being convenient to be opened again. The dual-electric pump cable penetrating packer can be re-opened only through directly pulling up a string shear pin without the need of any other operation. Meanwhile, all cable holes are substantially the same in size and the centers of the cable holes are distributed in the same circle. In this way, the inner diameter of a mandrel can be maximized, so that the mandrel can be connected with an oil pipe of a larger inner diameter. A multi-aperture penetrating body is used for the penetration of dual-electric pump six cables respectively, thus being good in sealing performance and strong in pressure resistance. The highest pressure can reach 70 MPa.

The invention discloses an excimer broadband pumping alkali metal laser by adopting a negative-branch confocal unstable-cavity structure. The excimer broadband pumping alkali metal laser comprises a pumping source, a concave reflector a, a concave reflector b, an alkali metal steam pool, a heating furnace and a planar high-reflectivity mirror. The alkali metal laser is suitable for taking alkali metals such as sodium, potassium, rubidium and cesium as gain media; a negative-branch biconcave confocal unstable cavity formed by the concave reflector a and the concave reflector b is adopted, so that the pump light of an annular light spot is subjected to multiple times of beam shrinkage and reflection in the unstable cavity according to the amplification factor of the unstable cavity, the pumplight is uniformly distributed in the alkali metal steam pool, repeated pumping is realized, the interaction length between excimers and the pump light is increased, the absorption and utilization ofthe excimers on the pump light can be greatly increased, and the conversion efficiency is improved. According to the invention, the pump light can be fully utilized under the condition that the cavity length of the laser is fixed, and implementation is easy; and through adoption of the method, the excimer broadband pumping alkali metal laser can be applied to the field of a high-energy laser.

The invention discloses a SiC MOSFET sub-module unit and crimping type packaging thereof, belongs to the technical field of semiconductor device packaging, and solves the problem that an existing SiC power chip is difficult to crimp and package. Each SiC MOSFET sub-module unit comprises a DBC (Direct Bond Copper) ceramic substrate, a source electrode molybdenum sheet, a SiCMOSFET chip array and a drain electrode molybdenum sheet; and N SiCMOSFET chips are arranged on the upper surface of the source electrode molybdenum sheet, N first protrusions are symmetrically arranged on the lower surface of the source electrode molybdenum sheet, the first protrusions are connected with the N SiCMOSFET chips respectively, grid electrodes and source electrodes of the SiCMOSFET chips are exposed, N second protrusions used for connecting and positioning the SiCMOSFET chips are arranged on the upper surface of the drain electrode molybdenum sheet, the SiCMOSFET chip array is composed of the N SiCMOSFET chips, and the exposed grid electrodes and source electrodes of the SiCMOSFET chips are connected to the DBC ceramic substrate. The power density of the module is improved, the heat dissipation capability is enhanced, the reliability of the device is improved, the insulation level of the module is improved by filling the module with silica gel, and the module can be applied to the high-voltage field.

The invention relates to the medical field, in particular to a burn treatment device used in the general surgery department. The device comprises a bed board, bed legs, universal wheels, a water bag base cushion, an inflation air cushion, a track, an air bleed piston port, an inflation device, an inflation device switch, a telescopic rod, a fixed part, a lamp panel, an infrared lamp and an infrared lamp switch. The number of the bed legs is four. The beg legs are arranged at the four corners of the bottom of the bed board respectively. The number of the universal wheels is four. The universal wheels are arranged at the bottom end of each beg leg respectively. The water bag base cushion is laid on the upper surface of the bed board. The inflation air cushion is laid on the upper surface of the water bag base cushion. The air bleed piston port is formed in the side edge of the inflation air cushion. The inflation device is arranged under the bed board. The inflation air cushion is connected with the inflation device through an air pipe. The track is fixed to the side edge of the bed board. The device is easy to operate and use. Through conversion between the water bag base cushion and the inflation air cushion, cold compress therapy can be conducted on the side, making contact with a bed body, of a burning patient. The position of the lamp panel can be adjusted conveniently so as to conduct recovery treatment by different intensities on different portions.

The invention relates to a bearing arrangement (12) for a part to be mounted such that the part rotates about an axis, such as a cylinder, roller, drum or shaft, comprising at least one rolling bearing (23), which is accommodated in a bearing housing (27), which is mounted movably in an arrangement housing (29) in a linearly movable manner by means of at least one linear guide (28), and also comprising an actuation device (1) for effecting a linear shifting movement of the bearing housing perpendicularly to the axis between a rest position and a working position. According to the invention, the actuation device comprises at least one prestressed spring element, which presses the bearing housing into the working position, and at least one hydraulic or pneumatic device for generating a restoring force acting counter to the spring element for moving the bearing housing into the rest position.

A magnetic resonance imaging (MRI) method and apparatus in which conductors are installed in the space between a static coil unit and a gradient coil unit to eliminate asymmetry of eddy current induced in the static coil unit. The structure permits a symmetrical distribution of eddy current when the concentric arrangement of the static coil unit and gradient coil unit has deviated. The MRI apparatus includes: a static coil unit configured to form a static field in a subject; a gradient coil unit configured to form a gradient field in the static field; and one or more conductors installed in the space between the static coil unit and the gradient coil unit, and configured to symmetrically distribute eddy current induced in the static coil unit.

In a method of operating a compressor of a gas turbine, where compressor air sucked in from the environment is cooled down by evaporation cooling before entering the compressor, before starting operation of the compressor, maximum possible temperature drops which could be achieved by evaporation cooling are determined dependent on different ambient conditions and / or are provided as a data set. These temperature drops are correlated with a compressor map containing maximum temperature distortions at different ambient conditions and different rotation frequencies of the compressor which have to be met in order to avoid pumping. The evaporation cooling is then only operated when current ambient condition result in a maximum possible temperature drop from which a predetermined fraction of between 50% and 100% does not exceed the maximum distortion which can be taken from the compressor map for these ambient conditions and the current rotation frequency of the compressor. Safe operation of the compressor can be achieved without the need or monitoring temperature distortions in the sucked in air stream.