17results about "Varistor cores" patented technology

It enhances the absorption efficiency of infrared rays across a wide wavelength range. [Solution] The infrared sensing element has a temperature sensing layer 22 and an infrared absorbing layer 25 provided separately from the temperature sensing layer 22, which absorbs infrared rays and converts them into heat. The temperature sensing layer 22 and the infrared absorbing layer 25 are thermally connected, and the infrared absorbing layer 25 contains iron oxide.

This invention discloses a heat-absorbing layer for a metal oxide varistor. A thermally protected metal oxide varistor (TMOV) device includes: an MOV chip; a first electrode disposed on a first side of the MOV chip; a second electrode disposed on a second side of the MOV chip opposite to the first side; a conductive first lead connected to the first electrode; a heat-absorbing layer bonded to the second electrode by a heat-absorbing paste formed from a mixture of silica sand, melamine cyanurate, and silicone resin, wherein the heat-absorbing paste is formed from a mixture of melamine cyanurate and silicone resin; a thermal cutoff (TCO) element extending through pores in the heat-absorbing layer and having a first end electrically connected to the second electrode by a certain amount of solder having a melting temperature lower than the melting temperature of the TCO element; and a conductive second lead electrically connected to the second end of the TCO element.

The application discloses a high-voltage large-current zinc oxide varistor disc and a preparation method and application thereof, and belongs to the technical field of overvoltage protection devices. 3 The zinc oxide varistor disc is composed of the following raw materials in percentage by weight: 95.0-97.5% of ZnO, 0.5-1.2% of Bi2O 3 0.8-1.5% of Sb2O 3 0.2-0.5% of Co2O 2 0.3-0.6% of MnO 3 0.1-0.3% of Cr2O 3 0.01-0.05% of Al2O 3 0.1-0.4% of SiO2 and 0.05-0.2% of a rare earth dopant RE2O The non-working surface of the zinc oxide varistor disc is sprayed with modified epoxy resin insulating paint, and the modified epoxy resin insulating paint is prepared by mixing tetrahydroxy octaphenyl double-layer cage-type silsesquioxane solution, epoxy resin, fillers and a curing agent. The zinc oxide varistor disc has a residual voltage ratio of less than or equal to 1.8, a voltage nonlinearity coefficient alpha of more than or equal to 50, and a performance attenuation rate of less than or equal to 5% after 1000 hours of aging at 150 DEG C under a 250kA 8 / 20 mu s impulse current, is excellent in electrical performance and weather resistance, and can meet the overvoltage protection requirements of extra-high-voltage and large-capacity power systems.

Provided are a composite device for automotive electric parts and a manufacturing method thereof. The composite device includes: a multi-layered ceramic capacitor having a plurality of first and second internal electrodes alternately arranged; a multi-layered ceramic varistor having a plurality of third and fourth internal electrodes arranged to face each other, the multi-layered ceramic varistor being stacked on one side surface of the multi-layered ceramic capacitor; an adhesive layer made of an insulating heat dissipation ceramic adhesive for bonding the multi-layered ceramic capacitor and the multi-layered ceramic varistor; and first and second external electrodes which connect the plurality of first and second internal electrodes exposed to both end portions of the multi-layered ceramic capacitor with the plurality of third and fourth internal electrodes exposed to both end portions of the multi-layered ceramic varistor, respectively.

To provide a multilayer varistor capable of suppressing the occurrence of migration.SOLUTION: A multilayer varistor 1 includes a sintered body 11, a first internal electrode 12A, a second internal electrode 12B, a first external electrode 14A, a second external electrode 14B, and a high resistance layer 13. The first internal electrode 12A and the second internal electrode 12B are provided inside the sintered body 11. The first external electrode 14A is provided onto the surface of the sintered body 11 and is electrically connected to the first internal electrode 12A. The second external electrode 14B is provided to the surface of the sintered body 11 and is electrically connected to the second internal electrode 12B. The high resistance layer 13 covers at least part of the surface of the sintered body 11, and the high resistance layer 13 has multiple cracks on the surface.SELECTED DRAWING: Figure 1

The application relates to the technical field of electrotechnical ceramics, and discloses a glass powder composition, a glass glaze material and a preparation method thereof, and a zinc oxide resistor and a preparation method thereof. The glass powder composition contains, based on the total weight of the glass powder composition, 65-78 wt% of Bi2O3, 10-20 wt% of ZnO, 1-8 wt% of CuO, 1.5-7.5 wt% of SiO2, 1-5 wt% of Al2O3, 1-4 wt% of Co2O3 and 4-10 wt% of B2O3, the content of the CuO is not higher than the content of the SiO2, the ratio of the content of the B2O3 to the content of the ZnO is less than or equal to 0.5, and the sum of the contents of the Bi2O3, the ZnO and the B2O3 is not less than 85% of the total weight of the glass powder composition. The zinc oxide resistor provided by the application can effectively prevent side flashover under current impact.

This utility model relates to a surge arrester that is easy to disassemble, comprising several surge arrester units, with adjacent surge arrester units detachably connected via a threaded structure. Each surge arrester unit includes: a connecting cylinder with a silicone rubber shed on its outer side; a nonlinear resistor element detachably installed inside the connecting cylinder; the uppermost and lowermost surge arrester units are respectively detachably connected to an upper connecting seat and a lower connecting seat; a mating part is integrally formed at the lower end of the connecting cylinder, and the mating part has external threads on its outer side; the inner walls of adjacent connecting cylinders have internal threads adapted to the external threads, achieving detachable connection through thread engagement. This easily disassembled surge arrester, due to its detachable structural design, allows for replacement of only the damaged component or the corresponding surge arrester unit when components such as the silicone rubber shed or the nonlinear resistor element are damaged, without replacing the entire surge arrester, significantly reducing maintenance costs and material waste.

A thermally protected metal oxide varistor (TMOV) device including a MOV chip, a first electrode disposed on a first side of the MOV chip, a second electrode disposed on a second side of the MOV chip opposite the first side, an electrically conductive first lead connected to the first electrode, a heat absorbing layer bound to the second electrode by a heat absorbing paste, the heat absorbing layer formed of a mixture of silica-sand, melamine cyanurate, and silicone, and the heat absorbing paste formed of a mixture of melamine cyanurate silicone, a thermal cutoff (TCO) element extending through a hole in the heat absorbing layer and having a first end electrically connected to the second electrode by a quantity of solder having a melting temperature lower than a melting temperature of the TCO element, and an electrically conductive second lead electrically connected to a second end of the TCO element.

Integrated device having GDT and MOV functionalities. In some embodiments, an electrical device can include a first layer and a second layer joined with an interface, with each having an outer surface and an inner surface, such that the inner surfaces of the first and second layers define a sealed chamber therebetween. The electrical device can further include an outer electrode implemented on the outer surface of each of the first and second layers, and an inner electrode implemented on the inner surface of each of the first and second layers. The first layer can include a metal oxide material such that the first outer electrode, the first layer, and the first inner electrode provide a metal oxide varistor (MOV) functionality, and the first inner electrode, the second inner electrode, and the sealed chamber provide a gas discharge tube (GDT) functionality.

The application relates to the technical field of power transformers, in particular to a 110KV power transformer with a lightning impact protection device, which comprises a 110KV transformer, the upper end of the 110KV transformer is provided with a mounting frame, the upper end of the mounting frame is provided with a plurality of lower insulation bases, the upper end of each lower insulation base is fixedly connected with a zinc oxide valve column, and the upper end of the zinc oxide valve column is fixedly connected with an upper insulation base; when the zinc oxide valve column generates heat due to lightning, a temperature-sensing driving mechanism drives a heat transfer mechanism to be in contact with a heat dissipation mechanism and an insulation heat conduction pipe, heat absorbed by the insulation heat conduction pipe is transmitted to the heat dissipation mechanism through the heat transfer structure, meanwhile, the heat transfer mechanism cancels the blockage of the first heat dissipation through hole by the lower blockage mechanism, drives the upper blockage mechanism to cancel the blockage of the second heat dissipation through hole, and external air enters the cavity between the insulation heat conduction pipe and the insulation outer sleeve, so that the zinc oxide valve column is rapidly cooled.

This invention discloses an ultra-high potential gradient zinc oxide varistor ceramic material and its preparation method. The composition of the varistor material by weight is: ZnO 95-97%, and the total amount of other additives is 3-5%. The content ratio of other additives is (with MnO2 content as 1, molar ratio): Bi2O3:Sb2O3:Cr2O3:MnO2:Co2O3:NiO:SnO2:SiO2:Y2O3:Al2O3 = (0.2-0.4):(0.1-1.0):(0.0005-0.0015):1:(0.2-0.8):(0.5-1.0):(0.3-0.7):(0.2-0.6):(0.01-0.15):(0.01-0.05). The preparation method includes the preparation of ultrafine composite powder, controlling the median particle size of the powder to be 0.1-0.3 μm; the sintering adopts a two-step method, first sintering at 700-850℃ for 0.25-2.0 hours, and then sintering at 850-1000℃ for 2.0-6.0 hours, finally obtaining a rheostat material with a potential gradient as high as 10-55 kV / cm; it can meet the application requirements of ultra-high potential gradient and lightweight miniaturization, and is expected to broaden the application of commercial high-performance zinc oxide varistor ceramic rheostat materials in the equipment field.

The application is a secondary protection gap voltage limiter, which solves the problem of power line trip after the protection gap is damaged by lightning. The lower end of the insulating rod is connected with the steel foot, and the upper part of the insulating rod and the first silicone rubber sheath are connected with multiple annular zinc oxide resistance sheets and annular electrodes from top to bottom. The annular electrodes are connected with the upper discharge electrode through a conductor. The angular connecting seat is sleeved on the steel foot, and the top end of the angular connecting seat is provided with a secondary discharge electrode. The shell is embedded with the first base, the first base is connected with the angular connector, and the shell is connected with the first base through a hinge. When the limiter fails, the shell rotates around the hinge. The upper end of the hot melt body in the shell is fixedly connected with the second base at the upper end of the shell, and the lower end of the hot melt body is fixedly connected with the mounting bolt. The upper discharge electrode and the lower discharge electrode form a first air gap, and the secondary discharge electrode and the upper discharge electrode form a second air gap.

This invention discloses a molding and assembly equipment for manufacturing power distribution devices, belonging to the technical field of metal valve resistor sheet assembly devices. It includes a side delivery shell, with a valve sheet screening plate hinged to the inner side of the side delivery shell. A folding assembly is located at the bottom of the valve sheet screening plate, and a shell plate resetting assembly is located at the bottom of the side delivery shell. The folding assembly is connected to the shell plate resetting assembly via a support assembly, and a negative pressure activation assembly is located on the surface of the folding assembly. Through the cooperative arrangement of the side delivery shell and the valve sheet screening plate, after the valve resistor sheet is fed into the screening track composed of the side delivery shell, the valve sheet screening plate, and the valve sheet conveying blades, it is driven to rotate by a drive wheel during its movement. When the valve resistor sheet rotates and encounters an irregularity, its diameter changes, causing the side delivery shell to shift. Then, driven by the folding assembly, the valve sheet screening plate folds downwards, transferring the irregular valve resistor sheet out.

Thermally protected metal oxide varistor (TMOV) device comprising an MOV chip, a first electrode located on a first side of the MOV chip, a second electrode located on a second side of the MOV chip opposite the first side, an electrically conductive first conductor connected to the first electrode, a heat-absorbing layer connected to the second electrode by a heat-absorbing paste, wherein the heat-absorbing layer is formed from a mixture of silicon dioxide sand, melamine cyanurate and silicone and the heat-absorbing paste is formed from a mixture of melamine cyanurate and silicone, a thermal shutdown element (TCO) extending through a hole in the heat-absorbing layer and the first end of which is electrically connected to the second electrode by an amount of solder having a melting temperature,which is lower than the melting temperature of the TCO element, and an electrically conductive second conductor that is electrically connected to a second end of the TCO element.

The utility model discloses a combined overvoltage protector relates to overvoltage protector technical field, including fixed base, resistance shell and connecting wire, the resistance shell inside is equipped with metal oxide varistor, the fixed base upper end surface four corners are fixed with support, the support upper end is equipped with lug, the fixed base top is equipped with support frame mechanism, support frame mechanism is connected with the support through the matching of lug, the support frame mechanism upper end is connected with protection mechanism, this combined overvoltage protector, through the cooperation design of support frame mechanism and protection mechanism, when dumping in the transportation or use process, can effectively buffer impact force, protects the internal core element, the arc plate design avoids the equipment direct impact ground, the elastic clamp structure can effectively fixed and protected connecting wire, prevents the damage of bending, the whole structure is stable and reliable, and the installation maintenance is convenient, has improved overvoltage protector's service life and security significantly.

The utility model relates to the technical fields of zinc oxide voltage-dependent resistor field, a kind of zinc oxide voltage-dependent resistor of composite electrode structure, including epoxy resin layer and ceramic layer, the inner wall of epoxy resin layer is fixedly connected with ceramic layer, the inner wall of ceramic layer is fixedly connected with silver plating, the inner wall of silver plating is fixedly connected with nickel-based alloy layer, the outer wall of nickel-based alloy layer is fixedly connected with zinc oxide layer, the outer wall of zinc oxide layer is connected with flow guide mechanism. After wire and plug-in electrode are formed into an entity, plug-in electrode is welded on zinc oxide layer using solder layer, wire and plug-in electrode can improve conductivity and inhibit silver ion migration, plug-in electrode enlarges the area of wire end, can increase the effective contact area of wire and plug-in electrode and zinc oxide layer, reduce contact resistance, improve the use effect of zinc oxide voltage-dependent resistor.