120results about How to "With electrical insulation" patented technology

The invention discloses a high-temperature proof insulating paint and making method, which comprises the following parts: 400-500g organic silica resin, 50-100g thermostable dye, 100-200g fill, 80-150 hollow ceramic microball, 30-60g bergmeal, 20-50g potassium titanate whisker, 100-150g solvent and 5-15g adjuvant.

The invention provides a hyperspectrum-based composite insulator aging operating state detection method. The method comprises the following steps of: firstly, obtaining a hyperspectral image of the composite insulator; then, preprocessing the obtained hyperspectral image, selecting a training sample, and establishing a composite insulator aging model; resolving the aging model parameter through the least squares method to obtain a composite insulator aging quantitative model; and finally, judging the degree of aging of the composite insulator through the aging model. The method can quantitatively describe the degree of aging of the composite insulator, and also can judge whether the composite insulator still has the electrical insulating performance according to the quantification on the degree of aging of the composite insulator, so as to change the degraded composite insulator in time.

The invention relates to an optical fiber bending loss principle-based wire strand breakage and damage detection method. The method comprises the following steps of: (1) fixing a sensing optical fiber for detection on a high-voltage power transmission wire at a certain angle; (2) transmitting detection laser to an incident end of the sensing optical fiber for detection by an optical time domain reflectometer; (3) returning a back Rayleigh scattering light signal to the optical time domain reflectometer by the sensing optical fiber for detection; (4) after receiving the back Rayleigh scattering light signal by the optical time domain reflectometer, performing sampling acquisition and analytic processing on the signal to obtain back Rayleigh scattering light power at each different position of the optical fiber transmission line and displaying a detection result curve on a panel of an oscilloscope of the optical time domain reflectometer; and (5) acquiring state information of the sensing optical fiber for detection, and further detecting and positioning strand breakage and damage existing on the high-voltage power transmission wire. Compared with the prior art, the method has the advantages of accuracy in positioning, capabilities of improving the polling efficiency of the power transmission line and the reliability of the power system and the like.

The invention relates to a rotary pump, particularly in a wet running design, the electric motor rotor (7) of which drives the pump impeller (5) via the shaft (21) thereof and is surrounded by the motor stator (17). The motor stator and the pump impeller are surrounded by the pump and motor housing (1, 3), forming an intermediate space (22, 25), wherein at least one vibration-damping element (10, 12, 28) is disposed in the intermediate space and supports the motor stator (17) in the pump and motor housing.

The invention discloses a distributed temperature measurement system based on optical fiber radiation attenuation temperature dependency. The system comprises a light source, a coupler, a sensitive optical fiber, a photoelectric detector, a drive circuit, a detection circuit and a computer, the drive circuit drives the light source, the light source emits pulsed light, the pulsed light enters into the coupler, an output optical fiber of the coupler is connected with the sensitive optical fiber, backscattering and reflected light signals of optical fibers are output to the photoelectric detector through the coupler, the photoelectric detector measures the light signals to output the light signals to the detection circuit, the detection circuit converts the detected light signals to electrical signals and subjects the electrical signals to amplification processing to transmit the processed electrical signals to the computer, and the computer performs real-time data processing and display. The sensitive optical fiber is an optical fiber subjected to irradiation and annealing process and has the advantages of being small in size, light, flexible in structure, resistant to electromagnetic interference and electric insulating, the attenuation of the sensitive optical fiber has stable relation of dependency on temperature, and the system can be used for temperature measurement of an electrical power system with high voltage, large current, strong electromagnetic interference, narrow space and the like and is applicable to the fields of tunnel fire early warning, oil exploitation downhole temperature monitoring and the like.

The invention provides hard PVC structural foam which is mainly prepared from, by weight, 80-150 parts of PVC resin, 30-60 parts of isocyanate, 0.5-10 parts of a supercritical fluid foamer, and 0.5-5parts of water vapor. The invention also provides a method and a shaping mold for preparing the hard PVC structural foam. The method includes the steps of preparing a foaming green body, performing primary foaming and secondary foaming and producing finish product. The shaping mold includes a cylindrical mold side board and an upper mold plate and a lower mold plate which are respectively arrangedon the upper and lower ends of the cylindrical mold side board in a sealing manner. Pressure applying devices are respectively connected to the upper mold plate and the lower mold plate. A side wallof the cylindrical mold side board is provided with an air inlet hole and an air exhaust hole. The hard PVC structural foam has high strength, is light in weight, is high in rigidity, and is anti-corrosion, electric-insulation and microwave-permeable. The preparation method is short in time and high in work efficiency, and can shorten the whole process to within 2 days.

The invention discloses a method for manufacturing fiber reinforced resin based composite reinforcements, which comprises the following steps of: putting fibers in an impregnation device to carry out impregnation treatment; winding the fibers treated by the impregnation device by using a spiral winding device; putting the fibers subjected to winding by the spiral winding device into a sand adding device so as to add sand on the fibers; putting the fibers treated by the sand adding device into a gelling device for gelling; putting the fibers subjected to gelling into a curing device for curing; and putting the fibers subjected to curing into a post-curing device for post-curing, thereby obtaining a fiber reinforced resin based composite reinforcement. The fiber reinforced resin based composite reinforcement manufactured by using the method disclosed by the invention has the characteristics of electrical insulation, non-magnetism, good bonding property with cement concrete, acid resistance, alkali resistance, corrosion resistance, light specific gravity, high strength, weld-free continuous reinforcement, and the like.

The invention discloses a thermal expansion pressure simulation test system and method for simulating warhead projectile explosive charge. The system comprises a charge simulation chamber, an expansion pressure sensor assembly, a sealing compaction nut, an explosive member, a constant temperature system, a temperature compensating fiber grating, a fiber demodulation system and a measurement control system. Projectile body explosive charge and semisolid state explosive thermal expansion pressure can be directly measured. An explosive test piece is arranged in a simulation chamber cylinder, theexplosive test piece is compacted by the expansion pressure sensor assembly, sealing compaction is exerted onto the expansion pressure sensor assembly, the simulation chamber cylinder is further sealed to form a simulation test projectile, the simulation test projectile is disposed in the constant temperature system, and projectile explosive charge thermal expansion pressure change is measured. The system is advantaged in that operation is simple, the measurement scope is large, measurement accuracy is high, good safety is realized, and a technical problem of direct measurement of projectile body explosive charge and semisolid state explosive thermal expansion pressure is solved.

The invention relates to a high-elasticity epoxy resin which mainly comprises an epoxy resin and an elastic curing agent. The high-elasticity epoxy resin is characterized by comprising the following components in parts by weight: 420-480 parts of epoxy resin, 20-80 parts of flame retardant agent, 25-40 parts of quadrol, 8-47 parts of accelerant, 3-26parts of binding agent, 11-32 parts of diluent and 0-17 parts of temperature resistant toughening agent. Because the high-elasticity epoxy resin adopted as an electronic potting material has the characteristics of elasticity, vibration prevention, moisture prevention, temperature resistance, heat conduction, flame retardance, electric insulation, and the like, the high-elasticity epoxy resin can ensure the long-term reliability of electronic products. The high-elasticity epoxy resin has the advantages of silicon rubber, can maintain the characteristics of the epoxy resin, has reduced cost and widely expanded application range and adds a novel potting material for the electronic industry.

The invention relates to a method for real-time monitoring of a crack on a composite-repaired structure based on a FBG sensor. The method comprises the following steps: step 1, selecting a test piece;step 2, carrying out structural mechanics analysis on the test piece and analyzing stress on two ends of the test piece; step 3, sticking the FBG sensor on an aluminum alloy thin plate (a 2A12 thin plate) according to finite element simulation results; step 4, mounting the aluminum alloy thin plate repaired by a composite and adhered by the FBG sensor on a fatigue testing machine for fatigue crack propagation tests; step 5, analyzing the wavelength changes of the crack after installation of the FBG sensor on the tip of the crack; and step 6, repeating steps 1-5. The method provided by the invention carries out real-time monitoring on the process of crack propagation and is more visual and effective than other methods. The FBG sensor used in the method has the advantages of small size, high sensitivity, electromagnetic interference resistance, corrosion resistance, high reliability, good compatibility with the composite, etc.

Provided is a heat-conductive elastomer composition that is useful for a heat-dissipating member of an electric or electronic part and the like. Elastomer heat conductivity is improved by mixing an elastomer composition, which is primarily a styrene elastomer, with a heat-conductive filler formed from an aluminum hydroxide, the surface of which is coated with an organic coupling agent, and/or a heat-conductive filler formed from a magnesium oxide obtained by coating the surface of deactivated magnesium oxide in the form of magnesia clinker with an inorganic substance and/or an organic substance.

The invention relates to a coupling agent, a porous carburizing coating fiber and a preparation method thereof, and belongs to the technical field of carbon fiber material preparation. The inherent low-strength problem of an existing activated carbon fiber is solved. The preparation method of the porous carburizing coating fiber comprises the following steps that 1, a basalt fiber is subjected tosurface acid and alkali etching treatment; 2, the surface modified basalt fiber is coated with a tetrahydrofuran solution of bis(2-furylmethoxy)dimethylsilane and a tetrahydrofuran solution of furaldehyde and furan methanol condensation resin, and the coating layer is further polymerized and solidified; and 3, the basalt fiber after coating is carbonized and activated to obtain the basalt fiber with a porous carburizing coating. According to the preparation method, the basalt fiber is adopted as a matrix fiber, a porous carbon layer is formed by surface carburizing treatment, thus the porous carburizing coating fiber has the pore characteristics of the activated carbon fiber, and meanwhile has good mechanical strength of the basalt fiber.

The invention provides a dual-layer three-dimensional noise reduction protection screen which comprises a plurality of flattop sound absorption wedges and a resonance noise elimination structure. The resonance noise elimination structure is composed of a three-dimensional support and a metal sheet. The three-dimensional support is of a box-type structure, the metal sheet is installed on one side of the three-dimensional support, the flattop sound absorption wedges are installed on the other side of the three-dimensional support, the metal sheet is provided with a plurality of micropores, a middle cavity of the three-dimensional support is filled with in-situ resonance materials, the flattop sound absorption wedges are of a pointless tetrahedral cone structure, and an inward-concave connecting groove is formed in the bottom of the protection screen. The dual-layer three-dimensional noise reduction protection screen is capable of effectively lowering low-frequency noise, easy to maintain, convenient to renew and longer in service life.