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32results about How to "Even power distribution" patented technology
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Preparation method of electric-conduction polyimide film
ActiveCN101698746AGood dispersionConductiveNon-conductive material with dispersed conductive materialOrganic solventPolyamic acid
The invention provides a preparation method of an electric-conduction polyimide film, comprising the following steps: step one: electric-conduction nano particles are placed in organic solvent for being dispersed in advance; step two: polyamic acid resin is polymerized in advance; step three: the electric-conduction nano particles and the polyamic acid resin are stirred in a reaction vessel for uniformly dispersing the electric-conduction nano particles in the resin and carrying out polymerization reaction; step four: the polyamic acid resin is pressed in a defoaming kettle to defoam the resin; step five: the polyamic acid resin is salivated into a polyamic acid film; step six: the polyamic acid film is placed in an imine furnace for carrying out imidization treatment; step seven: the film is flattened and coiled and then is cut. In the invention, the nano electric-conduction metal powder and carbon powder are uniformly dispersed in the polyamic acid resin, the film produced by the invention has high mechanical property and good electrical conductivity when being used as flexible electrical heating film material; in addition, the film has the remarkable advantages of rapid temperature rise and wide using temperature range.
Owner:NINGBO JINSHAN NEW MATERIAL
Process and device for measurement of spectral induced polarization response using pseudo random binary sequence (PRBS) current source
InactiveUS20100102822A1Improve signal-to-noise ratioEven power distributionElectric/magnetic detectionAcoustic wave reradiationSpectral induced polarisationBand II
A process and device for measurement of spectral induced polarization response of subsurface over a wide band of frequencies (0.03 Hz to 100 Hz) using pseudo noise current source, is provided. (Pseudo Random Binary Sequence current source). The measurement setup employs a current source (500 VA) and a computer controlled real time correlator for excitation of the subsurface. The current from the source is reversed through the grounded electrodes in a Pseudo Random Binary Sequence (PRBS) and the computer based receiver essentially computes Auto (input-input) and Cross (input-output) correlation estimates in the field. The collected data (time series) is transformed into frequency domain (DFT) in order to obtain the phase spectrum. The receiver has a provision to stack data for an improved S / N ratio. Measurements taken in laboratory using simple RC network, which simulates the subsurface, are accurate. Accuracy of measurement is better than 2% in Band-I (0.031-2 Hz) and 1% in Band-II (2-100 Hz) respectively.
Owner:COUNCIL OF SCI & IND RES
Supercritical water reactor fuel assembly and reactor core
ActiveCN105390167AReduce power crest factorSolve for uniformityNuclear energy generationShieldingNuclear engineeringAngular point
The invention discloses a supercritical water reactor fuel assembly. Radial three-region enrichment degree arrangement is adopted inside the fuel assembly. The fuel assembly comprises a moderator water rod, four fuel rods of the enrichment degree being 5.6%, 20 fuel rods of the enrichment degree being 7.5% and 32 fuel rods of the enrichment degree being 8.26%. The four fuel rods of the enrichment degree being 5.6% are distributed at lattice cell positions of four angular points respectively. Two fuel rods of the enrichment degree being 7.5% are distributed on the side face of each fuel rod of the enrichment degree being 5.6%. 12 fuel rods of the enrichment degree being 7.5% are evenly distributed on the moderator water rod, and the other lattice cell positions are each provided with one fuel rod of the enrichment degree being 8.26%.
Owner:NUCLEAR POWER INSTITUTE OF CHINA
Multimode fiber beam splitter and production method thereof
ActiveCN106772803AReduce stretch lengthReduce taperCoupling light guidesBeam splitterDivergence angle
The invention provides a multimode fiber beam splitter and a production method thereof. The multimode fiber beam splitter comprises an input optical fiber and multiple output optical fibers, wherein the input optical fiber and the multiple output optical fibers are fixedly connected, the input optical fiber is a multimode fiber, and the output optical fibers are single-mode fibers. According to the multimode fiber beam splitter, the optical fiber at an input end is the multimode fiber, so that laser with higher power strength, larger M<2> factor and larger waist diameter is coupled into the optical fiber at the input end conveniently, and higher input-end laser coupling efficiency is realized; the optical fibers at an output end are single-mode fibers, so that output laser with small divergence angle, small waist diameter and uniform power distribution can be obtained. Further, in the production method of the multimode fiber beam splitter, a flow for removing part of an outer cladding layer is set for the single-mode fibers at the output end, the tapering difficulty of the late tapering process can be reduced, the stretched length of cores of the optical fibers at the output end is reduced, and taper is small, so that fiber core size and numerical aperture change are small, butt joint with the optical fiber at the input end is facilitated, and the coupling efficiency is increased.
Owner:南通北外滩建设工程有限公司
Method for detecting interference of OFDM communication system
InactiveCN101895370AImprove detection accuracyReduce complexityError preventionMulti-frequency code systemsFrequency spectrumOfdm communication system
The invention provides a method for detecting the interference of an OFDM communication system, belonging to the technical field of communication technology. The method comprises the following steps of: setting an interference detecting threshold by extracting sonband data with minimum error rate on the basis of the statistics of a sonband error rate; intercepting and receiving adjoining Q frames in the data; and comparing data which is obtained by adding and averaging corresponding frequency points after sectioning, windowing and / FFT / with an interference detecting threshold TH to finally obtain an interference detecting result. The method belongs to a self-adapting blind interference detecting method. The method has the characteristics of high detection accuracy and low omission ratio, does not need to estimate information channel, reduces the complexity of a whole OFDM communication system, and can set the interference detecting threshold without a pilot frequency signal, thereby improving the use ratio of frequency spectrum resource of the OFDM communication system.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Multi-level sine pulse width modulation method
ActiveCN106953536AImprove harmonic performanceEven power distributionAc-dc conversionPhase shiftedHarmonic
The present invention provides a multi-level sine pulse width modulation method. The method comprises: (1) according to the level number N of a convertor, determining the waveform transformation of carrier waveform in a single-carrier period from isosceles triangle carrier waves to laminated multi-level triangle carrier waves; (2) according to the level number N of the convertor, performing phase shift of 360 degrees / (N-1) of each laminated carrier wave; (3) comparing the modulation waves with the laminated carrier waves: when the modulation waves are larger than or equal to the laminated carrier waves, outputting high levels, and when the modulation waves are smaller than the laminated carrier waves, outputting low levels; and (4) outputting one way of PWM waveform when the modulation waves are compared to each carrier wave according to the step (3), and finally obtaining each way of PWM waveform. The modulation method provided by the invention can be utilized in a single-phase circuit and a three-phase circuit, has good output voltage harmonic wave performance and can effectively improve the utilization of direct voltage.
Owner:HARBIN ENG UNIV
Distributed type high-frequency conversion-based modular solid-state transformer and control method therefor
ActiveCN107800298AReduce dv/dtEven power distributionDc-dc conversionElectric variable regulationCapacitanceLow voltage
The invention discloses a distributed type high-frequency conversion-based modular solid-state transformer and a control method therefor. The modular solid-state transformer comprises multiple cascaded modules; each module comprises two sub converters SCi1 and SCi2, a high-frequency transformer and an auxiliary inductor L, wherein i represents the i module; each sub converter consists of four power sub modules; the structure of the power sub module can be a half-bridge type structure or a full-bridge type structure; each half-bridge type structure comprises a capacitor, two IGBTs and adiode in anti-parallel connection with the IGBTs; each full-bridge type structure comprises a capacitor, four IGBTs and a diode in anti-parallel connection with the IGBTs; the input end of the transformer is in a high voltage; multiple modules are connected in series to be used as the input end; the output end of the transformer is in a low voltage; and multiple modules are connected in parallel to be used as the output end. By controlling the output voltage V<hi1> of the SCi1 and the output voltage V<hi2> of the SCi2, the flowing direction of the current i<hi1> can be controlled, and equivalently, power flowing direction control is realized, and voltage conversion and isolation are completed.
Owner:HUNAN UNIV
Bidirectional uniform irradiation antenna feed system
ActiveCN107634342AAvoid the risk of sparkingEven power distributionSimultaneous aerial operationsIndividually energised antenna arraysStanding wavePhysics
The invention relates to a bidirectional uniform irradiation antenna feed system. The system comprises a power division feed network (201) and multiple waveguide slit antenna arrays (118), wherein themultiple waveguide slit antenna arrays (118) are uniformly divided into two sets which are arranged up and down, each multiple waveguide slit antenna array (118) comprises eight waveguide slit antennas (402), the waveguide slit antennas (402) are arranged on a first power distributor (505) of the power division feed network (201), and the waveguide slit antennas (402) of the two waveguide slit antenna arrays (118) symmetric to each other up and down are arranged in a staggered mode. The system is advantaged in that bidirectional irradiation is employed, the top portion and the bottom portionrespectively have 32 waveguide slit antennas (402) which radiate to the middle, the radiation field is uniformly distributed, irradiation blind areas are effectively reduced, moreover, the waveguide slit antennas employ a standing wave array antenna mode, irradiation electromagnetic field length is uniformly distributed along the antenna direction, the two adjacent waveguide slit antennas are fedby different frequency sources, slits are in a mutual staggered mode, and electromagnetic field superposition is effectively reduced.
Owner:PORT OF DALIAN SLD TIMBER TRADING CENT CO LTD +2
Gadolinium-carrying fuel rod, fuel assembly with gadolinium-carrying fuel rods and pressurized water reactor core
ActiveCN104952492AConserve uranium resourcesLow maintenanceFuel elementsNuclear energy generationUranium oxideNuclear engineering
The invention discloses a gadolinium-carrying fuel rod, a fuel assembly with gadolinium-carrying fuel rods and a pressurized water reactor core. A fuel core body of the gadolinium-carrying fuel rod is composed of recycled uranium oxide and Gd2O3, wherein the mass percent of Gd2O3 is 3%-5% and the mass percent of the recycled uranium oxide is 95%-97%. The fuel assembly with the gadolinium-carrying fuel rods comprises fuel rods, guide pipes and a gauge pipe, wherein the fuel rods, the guide pipes and the gauge pipe are arrayed to form a square structure; the gauge pipe is arrayed at the center of the fuel assembly; and the fuel rods comprise fuel rods without gadolinium and the gadolinium-carrying fuel rods. The pressurized water reactor core adopts the fuel assembly with the gadolinium-carrying fuel rods to assist in controlling the residual reactivity of the reactor core. Recycled uranium fuel is prepared into the gadolinium-carrying fuel rods and the fuel assembly, which are used for the reactor core, and the safety requirements of the reactor core are met; and meanwhile, the requirements on solid combustible toxins for controlling the residual reactivity of the reactor core are met, uranium resources are effectively saved and the recycled uranium storage cost is reduced.
Owner:NUCLEAR POWER INSTITUTE OF CHINA
Intelligent phase-change switch
PendingCN109038621AEven power distributionImprove power utilization efficiencyPolyphase network asymmetry elimination/reductionElectric switchesLow voltageEngineering
The invention relates to the field of low-voltage power supply facilities, in particular to an intelligent phase-change switch. The intelligent phase-change switch comprises a shell composed of an upper shell and a bottom shell. A switch handle and a terminal cover are arranged on the upper shell. The intelligent phase phase-change switch is characterized in that an N inlet terminal, L1 inlet terminal, L2 inlet terminal and L3 inlet terminal are arranged sequentially from left to right at the top end of the bottom shell, and a null line terminal and fire wire terminal are arranged at the bottom end of the bottom shell. The bottom shell is provided with a tripping electromagnetic switch corresponding to the N inlet terminal, three parallel commutating electromagnetic switches, an error-proof locking system and a switching mechanism. The armature end part of the phase-change electromagnetic switch is connected with a phase-change guide rod, and the end part of the phase-change guide rodis connected with a movable contact mounted on a movable head slider, and a static contact is correspondingly arranged below the movable contact, and the static contact is connected with the fire wireterminal through a wire. The invention has the advantages of simple and reasonable structure, low product noise, good arc extinguishing performance, good mechanical performance, high reliability andaccuracy of the motion mechanism, and is suitable for processing and manufacturing and mass production.
Owner:秦传勇
Propane pre-cooling double-mixing refrigerant parallel-connection liquefaction system
InactiveCN102654346AEven power distributionEasy to handleSolidificationLiquefactionEngineeringRefrigeration
The invention discloses a propane pre-cooling double-mixing refrigerant parallel-connection liquefaction system, which comprises a pre-cooling cold box, two liquefaction cold boxes, a propane pre-cooling circulating mechanism and two mixed refrigerant liquefaction deep-cooling circulating mechanisms, wherein the propane pre-cooling circulating mechanism comprises a three-grade compression unit; and each mixed refrigerant liquefaction deep-cooling circulating mechanism comprises a first-grade compression unit. The liquefaction system provided by the invention adopts a propane pre-cooling double-mixing refrigerant parallel-connection refrigeration mode, and liquefaction and undercooling circulation adopt double-mixing refrigerant refrigeration circulation; the power distribution of three compressor units (one propane compressor and two mixing refrigerant compressors) is effectively balanced; the limitation on that the processing capability of the whole liquefaction device is affected because one compressor has too large power can be broken through; and the liquefaction capability of the device can be improved according to the maximum limitation of the current single compressor.
Owner:CHINA NAT OFFSHORE OIL CORP +1
A kind of preparation method of conductive polyimide film
ActiveCN101698746BGood dispersionConductiveNon-conductive material with dispersed conductive materialImideOrganic solvent
The invention provides a preparation method of a conductive polyimide film, which comprises the following steps: step 1 pre-disperses conductive nanoparticles in an organic solvent, step 2 pre-polymerizes polyamic acid resin; The particles and the polyamic acid resin are stirred in a stirring reactor so that the conductive nanoparticles are evenly dispersed in the resin and participate in the polymerization reaction; the fourth step is to press the polyamic acid resin into the defoaming kettle to remove the air bubbles in the resin, and the fifth step is to The polyamic acid resin is salivated to form a polyamic acid film; the sixth step is to enter the polyamic acid film into an imide furnace for imidization treatment; the seventh step is to flatten the film, roll it up, and perform slitting treatment. The invention uniformly disperses the nano-scale conductive metal powder and carbon powder in the polyamic acid resin, and the film produced by the method is used as the material of the flexible electric heating film, which not only has high mechanical performance, but also has good electrical conductivity, fast heating speed, high temperature The advantages of wide application range are obvious.
Owner:NINGBO JINSHAN NEW MATERIAL
Gadolinium-loaded fuel rods, fuel assemblies with gadolinium-loaded fuel rods, and pressurized water reactor core
ActiveCN104952492BConserve uranium resourcesLow maintenanceFuel elementsNuclear energy generationUranium oxideNuclear engineering
The invention discloses a gadolinium-carrying fuel rod, a fuel assembly having the gadolinium-carrying fuel rod, and a pressurized water reactor core. The fuel core of the gadolinium-loaded fuel rod is composed of recovered uranium oxide and Gd2O3. The mass fraction of Gd2O3 is 3% to 5%, and the mass fraction of recovered uranium oxide is 95% to 97%. A fuel assembly with gadolinium-loaded fuel rods, including fuel rods, guide tubes, and instrumentation tubes. The fuel rods, guide tubes, and instrumentation tubes are arranged in a square structure, and the instrumentation tubes are arranged in the center of the fuel assembly; the fuel rods include gadolinium-free fuel rods and The aforementioned gadolinium-loaded fuel rod. The PWR core employs the aforementioned fuel assemblies with gadolinium-loaded fuel rods to assist in controlling the residual reactivity of the core. The invention uses recycled uranium fuel to make gadolinium-carrying fuel rods and fuel assemblies for the core, meets the safety requirements of the core, and at the same time meets the requirements of the residual reactivity control of the core for solid combustible poisons, effectively saving uranium resources and reducing recycling Uranium storage costs.
Owner:NUCLEAR POWER INSTITUTE OF CHINA
Large-capacity intelligent phase-change switch
ActiveCN109559928AReduce dosageControl and adjust action timeElectric switchesLow voltagePhase change
The invention relates to the field of low-voltage power supply facilities, and discloses a large-capacity intelligent phase-change switch which has larger load capacity, is high in integration and intelligence and is more suitable for processing and mass production. The large-capacity intelligent phase-change switch comprises a top casing, a bottom casing and a bottom plate which are installed inorder from front to back, the surface of the top casing is provided with a display control board, the center of the bottom casing is fixed with a motor, the rotation shaft of the motor is connected with an electromagnetic relay, the top portion of the electromagnetic relay is provided with an angle sensor, a main control board and a power module are fixed in the bottom casing, at least one set ofmoving contacts are uniformly distributed at the outer circumference of the electromagnetic relay, one sides of the moving contacts are provided with an opening detection circuit, the lower portions of the moving contacts are provided with locking sliding pieces, the inner sides of the locking sliding pieces are provided with trip assemblies, the moving contacts pass through moving contact supports, the moving contact supports are fixed on the bottom casing, and the outer sides of the moving contact supports are provided with fixed contacts corresponding to the moving contacts.
Owner:菏泽峥艳电力科技有限公司
Method for preparing polyimide heating film
ActiveCN101699920BSolve low temperature feverSolve moderate temperature feverHeating element materialsElectrical resistance and conductanceHeating power
The invention provides a method for preparing polyimide heating film, comprising: step A, according to the requirements of square size area S, working voltage V and heating power P of a heating area of the heating film, calculating the required equivalent resistance R'=V2 / P, and then utilizing electrode distribution quantity to calculate the surface resistance R=L*R' / W of the heating film; step B, according to the surface resistance R figured out in the step A, producing a conductive polyimide film corresponding to the surface resistance R; step C, cutting the conductive polyimide film into square heating films with the area of S, and distributing a positive electrode and a negative electrode along the L direction; step D, covering insulating films at the two sides of the heating films for compound protection; and step E, welding or riveting electric wires on the positive electrode and the negative electrode, and making insulating or dampproof protection at the connection part. The method has the advantages that the electrical heating film produced by the method not only solves the problems of low temperature heat emission and intermediate temperate heat emission, but also has wide temperature using range, etc.
Owner:NINGBO JINSHAN NEW MATERIAL
Stubble cleaning subsoiling fertilizer applying plowing combined operation machine
PendingCN108668612AReduce compactionIncrease productivitySpadesMowersAgricultural engineeringDepth limit
Owner:甘肃武威兴旺农机制造有限公司
Fuel assembly for a nuclear boiling water reactor
ActiveUS9984776B2Improved cold shut-down marginImprove responseNuclear energy generationReactor fuel elementsNuclear engineeringNuclear power
A fuel assembly for a nuclear power boiling water reactor including a fuel channel defining a central fuel channel axis, fuel rods, each having a central fuel rod axis, at least 3 water channels for non-boiling water, each water channel having a central water channel axis and each water channel having a larger cross-sectional area than the cross-sectional area of (the average) fuel rod. The fuel rods include a first group of full length fuel rods and a second group of shorter fuel rods. The fuel assembly comprises 3 or 4 fuel rods which belong to said second group and which are positioned such that the central fuel rod axis of each of these 3 or 4 fuel rods is closer to the central fuel channel axis than any of the water channel axes of the water channels.
Owner:WESTINGHOUSE ELECTRIC SWEDEN
Propane pre-cooling double-mixing refrigerant serial-connection liquefaction system
InactiveCN102654347AEven power distributionEasy to operateSolidificationLiquefactionEngineeringRefrigeration
The invention discloses a propane pre-cooling double-mixing refrigerant serial-connection liquefaction system, which comprises a pre-cooling cold box a, a pre-cooling cold box b, a liquefaction cold box a, a liquefaction cold box b, a deep-cooling cold box a, a deep-cooling cold box b, a propane pre-cooling circulating mechanism, a mixed refrigerant liquefaction circulating mechanism and a mixed refrigeration deep-cooling circulating mechanism, wherein the propane pre-cooling circulating mechanism comprises a three-grade compression unit; the mixed refrigerant liquefaction circulating mechanism comprises a first-grade compression unit; and the mixed refrigeration deep-cooling circulating mechanism comprises a first-grade compression unit. The liquefaction system provided by the invention adopts the propane pre-cooling double-mixing refrigerant parallel-connection refrigeration mode, and liquefaction and undercooling circulation respectively adopt independent mixing refrigerant refrigeration circulation; the power distribution of three compressor units (one pre-cooling circulation compressor, one liquefaction circulation compressor and one undercooling circulation compressor) is effectively balanced; the limitation on that the processing capability of the whole liquefaction device is affected because one compressor has too large power can be broken through; and meanwhile the maneuverability of the device can be improved.
Owner:CHINA NAT OFFSHORE OIL CORP +1
An electric drive active heave compensation marine winch
ActiveCN104555769BNo pollution in the processSo as not to damageWinding mechanismsElectricityActive heave compensation
The invention discloses an electrically-driven active heaving supplementing type marine winch. The electrically-driven active heaving supplementing type marine winch comprises a cable coiling and uncoiling system, an automatic cable arranging system, a braking system and an active heaving supplementing system; the cable coiling and uncoiling system comprises a coiling block supporting bottom frame, a coiling block and a main transmission system; the main transmission system is mounted at one side of the coiling block, and while a brake disc is arranged at the other side of the coiling block; the braking system is arranged on the brake disc; the automatic cable arranging system is positioned at the back of the coiling block; the active heaving compensating system is respectively connected with the active transmission system, the automatic cable arranging system and the braking system. According to the marine winch, an AC variable frequency electrically-driven single-shaft structural form is adopted; compared with the traditional hydraulic-driven winch, the electrically-driven active heaving supplementing type marine winch has the characteristics of being convenient to operate, fast to lower down and lift, small in noise, small in size, compact in structure, high in energy conversion efficiency, and free of environmental pollution and damage.
Owner:HUNAN UNIV OF SCI & TECH
A supercritical water reactor fuel assembly and core
ActiveCN105390167BSolve the problem of uneven power distributionReduce power crest factorNuclear energy generationShieldingNuclear engineeringAngular point
The invention discloses a fuel assembly for a supercritical water reactor. The fuel assembly adopts a radial three-zone enrichment arrangement, and the fuel assembly includes: moderator water rods, and four fuel rods with an enrichment degree of 5.6%. , 20 fuel rods with an enrichment degree of 7.5%, and 32 fuel rods with an enrichment degree of 8.26%. Two fuel rods with 7.5% enrichment are evenly distributed on the side of the fuel rod with 5.6% enrichment, 12 fuel rods with 7.5% enrichment are evenly distributed in moderator water rods, and the remaining cells are arranged separately 1 fuel rod with 8.26% enrichment.
Owner:NUCLEAR POWER INSTITUTE OF CHINA
Modular solid-state transformer and its control method based on distributed high-frequency conversion
ActiveCN107800298BReduce dv/dtEven power distributionDc-dc conversionElectric variable regulationCapacitanceTransformer
Owner:HUNAN UNIV
Fuel assembly for a nuclear boiling water reactor
ActiveUS10395780B2Improved cold shut-down marginImprove responseNuclear energy generationReactor fuel elementsWater channelNuclear power
A fuel assembly for a nuclear power boiling water reactor, including: a fuel channel defining a central fuel channel axis, fuel rods, each having a central fuel rod axis, at least 3 water channels for non-boiling water, each water channel having a central water channel axis and each water channel having a larger cross-sectional area than the cross-sectional area of (the average) fuel rod. The fuel rods comprise a first group of full length fuel rods and a second group of shorter fuel rods. The fuel assembly comprises at least 5 fuel rods which belong to said second group and which are positioned such that the central fuel rod axis of each of these at least 5 fuel rods is closer to the central fuel channel axis than any of the water channel axes of the water channels.
Owner:WESTINGHOUSE ELECTRIC SWEDEN
A large-capacity intelligent commutation switch
ActiveCN109559928BReduce dosageControl and adjust action timeElectric switchesLow voltagePhase change
The invention relates to the field of low-voltage power supply facilities, and discloses a large-capacity intelligent phase-change switch which has larger load capacity, is high in integration and intelligence and is more suitable for processing and mass production. The large-capacity intelligent phase-change switch comprises a top casing, a bottom casing and a bottom plate which are installed inorder from front to back, the surface of the top casing is provided with a display control board, the center of the bottom casing is fixed with a motor, the rotation shaft of the motor is connected with an electromagnetic relay, the top portion of the electromagnetic relay is provided with an angle sensor, a main control board and a power module are fixed in the bottom casing, at least one set ofmoving contacts are uniformly distributed at the outer circumference of the electromagnetic relay, one sides of the moving contacts are provided with an opening detection circuit, the lower portions of the moving contacts are provided with locking sliding pieces, the inner sides of the locking sliding pieces are provided with trip assemblies, the moving contacts pass through moving contact supports, the moving contact supports are fixed on the bottom casing, and the outer sides of the moving contact supports are provided with fixed contacts corresponding to the moving contacts.
Owner:菏泽峥艳电力科技有限公司
Composite laser welding method
PendingCN114769873AEven power distributionImprove absorption rateLaser beam welding apparatusWeld seamMelt depth
The invention relates to a composite laser welding method. The composite laser welding method comprises the following steps that (1) a workpiece to be welded is placed on a welding workbench; (2) laser preheating: a laser beam moves along a welding seam at the position of the welding seam to preheat a to-be-welded workpiece; (3) laser cleaning is conducted, specifically, a laser beam moves along a weld joint at the position of the weld joint to conduct laser cleaning, carbon generated in the preheating process is separated out, and an oxide layer and other impurities are cleaned up; and (4) laser welding is conducted, specifically, a laser beam moves in the weld joint and conducts welding along the weld joint. According to the laser preheating method, the local preheating mode of the welding seam position is achieved, the laser preheating is conducted on the welding seam position of the to-be-welded workpiece before welding, so that the laser absorption rate of the to-be-welded material is higher, thicker materials can be welded through lower laser power, the welding penetration depth is increased, and after laser cleaning, air holes are not prone to being generated in the product. By the adoption of the welding process, the welding seam strength can be greatly improved, and all laser process defects are effectively improved.
Owner:湖南中南智能激光科技有限公司
A Multilevel Sinusoidal Pulse Width Modulation Method
ActiveCN106953536BImprove harmonic performanceEven power distributionAc-dc conversionPhase shiftedHarmonic
Owner:HARBIN ENG UNIV
an electrode structure
ActiveCN108963299BUniform temperature distributionEven power distributionCell component detailsFuel cellsStructural engineeringWater pipe
Owner:珠海安普特科技有限公司
A kind of control method of central air-conditioning system
ActiveCN108361910BWork lessImprove standardizationMechanical apparatusLighting and heating apparatusData controlControl engineering
The invention discloses a control method of a central air conditioning system. The method comprises the steps of S1, building a system measuring sensing network in an area; arranging a temperature sensor and a power metering device at a terminal; and arranging a measuring host which is in signal connection with a control host at the control host; S2, reading the terminal temperature data measuredby the temperature sensor and the terminal power data measured by the power metering through the metering host; reading instantaneous temperature data by the control host; and comparing with the instantaneous temperature data; and S3, analyzing in the following ways: decreasing the power of a positioning terminal and increasing the power of other terminals if the terminal power data of other terminals surrounding the positioning terminal with high terminal power data are low and the terminal temperature data of the positioning terminal is less than the terminal temperature data of other terminals; sending positioning alarming prompt if the difference between the terminal temperature data of the positioning terminal and the instantaneous temperature data is beyond the maximum data of otherterminals; and sending examination alarming prompt if the difference is less than the minimum data of other terminals.
Owner:上海广岚机电设备有限公司
A split torque transmission mechanism for helicopter main reducer
ActiveCN103968003BLarge transmission ratioLight in massToothed gearingsRotocraftReduction driveReducer
Owner:NORTHWESTERN POLYTECHNICAL UNIV
A new electrode structure
ActiveCN108963299AUniform temperature distributionEven power distributionCell component detailsFuel cellsAgricultural engineeringElectrode
The invention discloses a novel electrode structure, Include hanging frame, A suspension frame is fixedly connected with a plurality of odd-numbered electrode plates and an even-numbered electrode plate through a plurality of mount strips and connecting blocks, At one side of that top end of the odd-numbered electrode plate and the even-numbered electrode plate, a first opening and a conductive rod mount seat are fixedly provided, the other side of the top end of the electrode plate is fixedly provided with a second opening, two adjacent odd-numbered electrode plates are communicated with eachother through a first connecting water pipe, the adjacent two even-numbered electrode plates are communicated with each other through a second connecting water pipe, The conductive rod mounting seaton the odd-numbered electrode plate is connected with the second conductive rod, and the conductive rod mounting seat on the even-numbered electrode plate is connected with the first conductive rod. The novel electrode structure of the invention makes the temperature distribution of the electrode structure uniform when the electrode structure works through the arrangement of the inlet and outlet water structures of the electrode structure. By arranging the connecting structure of the first conductive rod and the second conductive rod, the power distribution of the electrode structure is uniform when the electrode structure is operated.
Owner:珠海安普特科技有限公司
Pumpless multi-wavelength Brillouin fiber laser sensor for low-frequency detection
ActiveCN105606140BHigh sensitivityEven power distributionConverting sensor output opticallyLine widthSpectrum analyzer
The invention relates to a fiber laser sensor, and specifically relates to a pump-free multi-wavelength Brillouin fiber laser sensor for low-frequency detection. The sensor solves the problems of low detection sensitivity, poor anti-interference capability and low measurement precision of the existing fiber laser sensor. The pump-free multi-wavelength Brillouin fiber laser sensor for low-frequency detection comprises a narrow line width single-frequency laser, a second one-way light divider, a low-frequency photoelectric detector, a spectrum analyzer and a resonant cavity; the resonant cavity comprises a semiconductor optical amplifier, an optical circulator, a polarization controller, an optical isolator, a first one-way light divider and a Sagnac circular endoscope; and the Sagnac circular endoscope comprises a double-way light divider and a high nonlinear sensing fiber. The invention is applicable in the field of fiber sensors.
Owner:TAIYUAN UNIV OF TECH
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