136 results about "Mineral-insulated copper-clad cable" patented technology

Components for use in a temperature controlled heatable object are provided in which a temperature sensor is connected to a transmitter such as a Radio Frequency Identification (RFID) tag. The RFID tag is encased in a protective overmolding and connected to the temperature sensor via a mineral insulated cable. An end cap containing a potting material (such as silicone or ceramic) is placed over the temperature sensor and laser welded to a sheathing of the mineral insulated cable. A potting material for use in a heatable object is also provided comprising a silicone-based material that is modified by adding bauxite to increase thermal conductivity.

The invention relates to a double-shielded mineral-insulated cable which is mainly applied to the fields of high-frequency signal transmission in occasions with high ambient temperature and high radiation, such as the communication fields of metallurgy, medical treatment, aerospace, military and the like. The double-shielded mineral-insulated cable comprises an inner conductor, an insulating medium, an outer conductor, an insulating medium and a protective sleeve in sequence from inside to outside, and is characterized in that the insulating medium is magnesium oxide, aluminum oxide or silicondioxide. Compared with the existing double-shielded cable, the double-shielded mineral-insulated cable has the advantages of longer service life and wider use range; in addition, the double-shieldedmineral-insulated cable has excellent performance, has little interference to transmitted signals and can be used for the communication fields of metallurgy, medical treatment, aerospace, military andthe like.

The invention relates to a three-coaxial mineral insulated cable which is mainly applied to the field of the transmission of a high-frequency signal in an occasion with high environmental temperature and high radiation, such as the communication fields of metallurgy, medical treatment, aerospace, military affairs and the like. The three-coaxial mineral insulated cable comprises an internal conductor layer, an internal insulation dielectric layer, an internal shielding layer, an external insulation dielectric layer, an external shielding layer and a sheath layer sequentially from the inside to the outside. The three-coaxial mineral insulated cable is characterized in that the internal insulation dielectric layer and / or the external insulation dielectric layer are magnesia, alumina or silicon dioxide. Compared with the prior coaxial cable, the three-coaxial mineral insulated cable has the advantages of longer service life and more extensive use range.

The invention discloses a corrugated metallic sheath inorganic mineral insulated cable and a manufacturing method thereof. The cable consists of an inner cable core, an insulating layer winding the outside of the cable core, and an outermost metallic sheath; the cable core is formed by twisting a bundle of copper wires, the insulating layer is an inorganic mineral insulated tape, the metallic sheath is a copper corrugated tube, corrugation of the copper corrugated tube has upper peaks and lower valleys, the cable core, the insulating layer and the copper corrugated tube have the same length, and the surface of the copper corrugated tube is provided with a welding seam with the same length of the copper corrugated tub along the axial direction. As the cable takes a corrugated shape, the cable is easy to be bent and mounted in a laying field, which lowers the construction cost, can prevent a cable conductor and the insulating layer from being directly burnt by flame, prevents a phase and phase conductor from short circuit, and prevents elevators and fire fighting devices from being incapable of operating without power supply, thus obtaining precious time to facilitate persons to escape in time, and reduce property loss.

The invention discloses a computing method and a verifying device and method for the current carrying capacity of a flexible mineral insulated cable. According to a steady-state thermal circuit model, a measuring device and method for the thermal resistivity of mica tape materials and warping tape are designed and built; according to the insulation thermal resistance of multilayer lapping, the influence of air gaps on the thermal resistance is analyzed, a mica tape / air gap series thermal resistance model is built, the thermal resistance is normalized, the concept and the computing method for the filling coefficients and the lapping equivalent radius are provided, and the computing method for the multilayer-lapping insulation thermal resistance is built; the influence of air gaps between corrugated copper sheaths and a cabling lapping layer on the inner protecting thermal resistance is analyzed, the computing method for the front equivalent radius and the back equivalent radius of the corrugated copper sheaths is provided, and the computing method for the composite inner protecting thermal resistance formed by cabling lapping and the air gaps is built; the experiment device for verifying the current carrying capacity is designed and built. The computing method and the verifying device and method have the advantages of being simple in structure, accurate in testing and convenient to operate.

The present invention discloses a cable with a copper core, a copper protecting sleeve and a mineral insulator having the rated voltage of 3kV or below and the manufacturing method thereof. The cable is constituted of conductor 1, covering layer 2 of the conductor, insulating layer 3, copper protecting sleeve 4 and outer protecting sheath 5. In order to obtain the cable with a copper core, a copper protecting sleeve and a mineral insulator, the manufacturing method comprises the steps as follows: providing evenly covering layer 2 of the conductor around conductor 1 to form a conductor core; then filling insulating layer 3 between the conductor core and copper protecting sleeve 4 to form a cable blank; stretching the cable blank consisting of conductor 1, covering layer 2 of the conductor, insulating layer 3 and copper protecting sleeve 4 to reduce its diameter and make insulating layer 3 fully fill up the gap between the conductor core and copper protecting sleeve 4 so as to form the cable. The cable and the method of the invention can increase effectively the insulating property of the cable, so that this cable has the high voltage level, the wide suitable range and the good safety.

The invention discloses a magnesium oxide mineral-insulated cable production method, which comprises the following steps: S1) carrying out magnesium oxide powder granulation to obtain magnesium oxide particles; S2) inputting the magnesium oxide particles into a forming machine and carrying out pressing to form a half-cylindrical embryo body; S3) carrying out sintering on the half-cylindrical embryo body to form magnesium oxide porcelain bodies; S4) selecting two magnesium oxide porcelain bodies to cover a copper rod conductor, and longitudinally wrapping copper strips outside the merged cylindrical magnesium oxide porcelain body to form a cable embryo body; and S5) carrying out drawing, on-line annealing and cold rolling on the cable embryo body to form a magnesium oxide mineral-insulated cable. The provided magnesium oxide mineral-insulated cable production method not only can improve cable reducing continuous rolling technology, reduces annealing frequency, improves cable production process length and reduces process, but also improves work efficient greatly, saves power and reduces production energy consumption.

A production method of insulating cable includes the following steps: 1) fabricate a cleaned and straightened copper tube with a wire core; 2)dry MgO powder and keep it under 250oC - 300oC; 3)fix the copper tube at the stand of a tamp device which is composed by stand, tamping rod, tamping head and balance weight; 4) load MgO powder by loading machine in the room between the wire core and the copper tube and tamp simultaneously; 5) stretch the filled tube and quench, then stretch and quench till the design size; extrude cover the tube with plastic.

The present invention relates to a metal sheath inorganic mineral insulation electric cable fire resistance performance testing method, which comprises: S1, selecting an electric cable; S2, carrying out single electric cable fire resistance testing, wherein an electric cable is vertically fixed inside a fire resistance test apparatus, flame is sprayed through a propane burner, the flame length is controlled at 15-20 cm, the distance between the flame and electric cable contact point and the upper end fixation point is 40-50 cm, the electric cable is burned for 10-15 min, and the length of the part damaged by the burning is recorded; S3, carrying out bundle electric cable fire resistance testing, wherein 3-5 electric cables are vertically fixed on a trapezoidal testing frame, the trapezoidal testing frame is placed inside the fire resistance test apparatus, air is introduced, the flow rate is controlled at 60-100 L / min, flame is sprayed through the propane burner, the flame temperature is controlled at 450-950 DEG C, burning is performed for 20-30 min, and the burning condition is recorded; and S4, judging the fire resistance performance, wherein it is judged that the fire resistance performance passes through the testing if the length of the part damaged by the burning in the step S2 does not exceed 30 cm and no burning exists within 20 min in the step S3. According to the present invention, the method has advantages of simple operation, and accurate and reliable testing data.

The invention relates to the technical field of special cables and provides an implementation method of a mineral insulated coaxial cable which can realize signal communication transfer in an extreme weather condition; and the dielectric property and the high-temperature insulation performance of the cable can be comprehensively optimized to well satisfy the using requirements of the signal communication coaxial cable. The mineral insulated coaxial cable is characterized by comprising an inner conductor, an insulating medium layer and a three-layer composite shield body from inside to outside; the insulating medium layer is made of a mixture of aluminium oxide and silicon oxide; the three-layer composite shield body is formed by sequentially compositing an inner shield body, a middle shield body and an outer shield body, each layer can be made of copper pipes, iron pipes, stainless steel pipes or other high-temperature alloy pipes, and the adjacent layers can not be made of the same material. Compared with the conventional organic matter insulated cable, the three-layer composite shield mineral insulated coaxial cable has relatively long service life and relatively high reliability. Compared with a magnesium oxide mineral insulated cable, the three-layer composite shield mineral insulated coaxial cable has a relatively wide application field.

A housing between mineral-insulated cable and connecting wire in a turbocharger overheating protection device may include the following characteristics:coiled regions of springs (10) arranged point-symmetrically to each other; orthe springs (10) are not placed on axes; orthe coil regions of the coil springs (10) for cushioning the film resistor are shorter than its substrate length and longer than its substrate width; orthe connecting wires of the film resistor are shorter than its substrate length and longer than its substrate width; orthe springs are arranged staggered in their longitudinal direction adjacent to each other; orcoil springs (10) are used, in which the coils are located only in one half of the spring (10) and the coils of one spring are arranged staggered in the longitudinal direction to the coils of the other spring (10).

The invention discloses a fire-resistant insulated cable containing calcined coal series kaolin. The fire-resistant insulated cable containing the calcined coal series kaolin comprises a cable core, an insulating layer and a sheath. The insulating layer is mainly made of, by mass, 30-40 parts of the calcined coal series kaolin and 50-60 parts of magnesium oxide in a calcining mode, and is used for replacing the insulating layer, made of magnesium oxide powder, of an existing mineral insulated cable. The insulation resistance and the shortest continuous power-on time during a fire disaster of the fire-resistant insulated cable are higher than the international standards, the fire-resistant insulated cable has a good fire-resistant insulating effect, and the water absorption rate of the fire-resistant insulated cable is lower than the international standard.

A mineral insulated heating cable for a heat tracing system. The heating cable includes a sheath having at least a first, and optionally a second layer, wherein the thermal conductivity of the second layer is greater than a thermal conductivity of the first layer. In addition, the first and second layers are in intimate thermal contact. The heating cable also includes a least one heating conductor for generating heat and a dielectric layer located within the sheath for electrically insulating the heating, conductor, wherein the sheath, heating conductor and dielectric layer form a heating section. In addition, the heating cable includes a conduit for receiving the heating section. Further, the heating cable includes a cold lead section and a hot-cold joint for connecting the heating and cold lead sections. In addition, a high emissivity coating may be formed on the first layer.

The invention discloses a mineral-insulated flexible fire-proof cable coated by a high-strength non-magnetic corrugated stainless steel sheath. The cable includes a wire which is arranged inside a cable-making lapping layer and is cladded with an insulation layer, inorganic heat-insulating fire-proof filling material which are filled between the insulation layer and the cable-making cladding layer, a stainless steel sheath which coats the outer circumferential surface of the cable-making cladding layer, and a fire-proof coating layer which is sprayed on the outer circumferential surface of the stainless steel sheath. The cable of the invention has the advantages of fire-proofness of mineral-insulated cables, simple production technology, flexibility in any-length section production, variable specifications, high strength and excellent flexibility, and convenient installation and laying.

The invention discloses a novel high-flexibility mineral insulated special cable. The copper conductor passes through a plurality of insulated supporting frames; a metal sheath layer is arranged outside the copper conductor and the insulated supporting frames; and an inorganic powder insulated material fills space between the metal sheath layer and the copper conductor. As the non-sintered inorganic powder fills the inner part of the metal sheath layer, the bending performance of the mineral insulated cable is improved fundamentally; and the insulated supporting frames connected with the conductor can ensure the radial distance between the conductor when bent and the metal sheath is uniform.

Methods, system and devices for deploying an MI cable heater down-hole into a hydrocarbon reservoir are provided, wherein one or more MI cables are housed inside a protective jacket, and connected to a pump-in device. The pump-in device allows the cable to be deployed by pumping fluid down-hole, and the pump-in device catches the fluid and pulls the cable down-hole, even in a horizontal well.

The present invention provides a mineral insulated cable assembly, the mineral insulated cable assembly includes cables, wherein the cables adopt inorganic mineral insulated cables, and the mineral insulated cable assembly further comprises: a connector set, wherein the connector set is used for connecting one end of the two cables; a bellows, wherein the bellows is sleeved on an outer circumference of a plurality of the cables, and the bellows is for protecting the cables; and a connector transfer tail attachment, and the connector transfer tail attachment is fixedly connected to the connector set and the bellows. The mineral insulated cable assembly adopts an inorganic design, and enables the cables, the connector, and the transfer tail attachment etc. in the assembly to be free of organic materials, and has no heat aging and irradiation aging mechanism, and can meet very demanding working environment such as high temperature, high pressure, high humidity and high irradiation etc. inside or on edge of a reactor pressure vessel, can meet 60-year working life, and enables the connector to meet 200 insertions and removals.

The invention discloses a metal sheath mineral insulated cable uniform rolling device and an application method. A workbench and a power box are included. A wiring groove and a lead screw are arrangedin the workbench, and a wiring box is arranged on the lead screw. One side surface of the workbench is connected with a limiting plate through an air cylinder. A motor, a gear speed changing box anda gear reversing device are arranged in the power box, and cooperation with a cable disc is achieved through a rotation shaft and a chuck structure at one end of the rotation shaft. The single motor is adopted in the device to drive the cable disc and a wiring device, a cable penetrates through the uniform-speed moving wiring device to be wound around the cable disc, and uniform wiring is achieved; long-cable multi-time reciprocated wiring is achieved through cooperation of the wiring device and the reversing device; an arc penetration groove is formed in the wiring box and used for pre-reeling, the problems that the existing equipment wiring position is fixed, winding is uneven, and consequently the gravity center of a cable disc is not stable and the problem that since pre-reeling cannotbe conducted, an outer sheath of a metal sheath cable is broken and torn are solved; and the characteristics that wiring is uniform, the reeling effect is good, and the cable can be protected againstdamage are achieved.

The invention discloses a vitrified silicon rubber insulation fireproof cable which comprises a cable core, wherein the cable core is formed by stranding a plurality of insulation wire cores; a flame resistance filler is filled in a gap in the cable core; an armor layer is extruded on the cable core; and an outer sheath is extruded on the outermost layer. Each insulation wire core consists of a middle conductor and a vitrified silicon rubber insulation layer wrapping the conductor. Large-length and high-specification production is realized; a product is soft and convenient to assemble and lay; the number of middle joints is small; and the performance can completely meet the standard requirement of ore insulation cables.

The invention discloses synthetic mica. The synthetic mica is mainly prepared from the following raw materials: quartz powder, fused magnesia, potassium fluorosilicate, alumina powder, potassium tetrafluoroaluminate and potassium carbonate. The synthetic mica is applied to fabrication of flexible mineral insulated cables. A preparation method for the synthetic mica comprises the following steps: (1) fully and uniformly mixing quartz powder, fused magnesia, potassium fluorosilicate, alumina powder, potassium tetrafluoroaluminate and potassium carbonate in a mixer in proportion; (2) building a furnace body from refractory bricks, and installing graphite electrodes in the furnace body for heating, wherein the shape of the furnace body and a hearth are both of an oval shape to match with the arrangement of the electrodes; and (3) putting the materials uniformly mixed in the step 1 into the above furnace body for electrothermal calcination and melting, and then carrying out clarification, cooling and crystallization so as to obtain synthetic mica crystal blocks which are used for making the flexible mineral insulated cables. The yield of primary synthetic mica is improved. The syntheticmica of the invention has good light transmittance, low water absorption rate, high melting point, and almost no carbonization residue.

The invention relates to a medium-voltage fireproof termite-resisting cable which includes at least three conductors with insulators. The insulators are crosslinked-polyethylene insulators. A conductor shield is arranged between each conductor and a corresponding insulator. An insulating shield, a copper-tape shield and a phase-splitting fireproof layer lap the insulator of each conductor. A ceramic silicone rubber composite tape I, an oxygen isolation layer, a ceramic silicon rubber composite tape II, a copper pipe and a protective sleeve wrap the three conductors sequentially. A filling rope is arranged between the three conductors and the ceramic silicon rubber composite tape I. The filling rope is an inorganic paper filling rope. The oxygen isolation layer is a low-smoke halogen-free polyolefin oxygen isolation layer. The protective layer is a nylon protective sleeve of high-density polyethylene. The conductor shields and the insulating shields are semi-conductive crosslinked-polyethylene shields. The copper pipe is a longitudinally wrapped argon-arc-welding corrugated pipe. The medium-voltage fireproof termite-resisting cable is significantly great in fireproof performance, capable of reaching a fireproof grade of a mineral insulating cable and high in mechanical strength.

The invention discloses a mounting base for high-altitude fixing of a flexible mineral insulated cable. The mounting base structurally comprises a cable clamping device, a clamping base body, channels, a vacuum sucker and the flexible mineral insulated cable, wherein the vacuum sucker is mounted at the bottom of the clamping base body; three channels which are arranged at equal intervals are formed in the clamping base body side by side; and the three channels are communicated with one another. Compared with the prior art, the mounting base has the beneficial effects that the mounting base isless in mounting step, simple to operate, high in speed and short in time, and the working efficiency can be improved; a rotating disc can be fixed after being mounted, so that the rotating disc can be effectively prevented from loosening, and the rotating disc cannot loosen after being clamped; the clamping degree of the cable clamping device to the flexible mineral insulated cable can be furtherimproved, the clamping degree of the cable can be prevented from being reduced along with time migration, and the cable can be prevented from being separated from the mounting base; the mounting basecan be suitable for cables with different calibers, and is wide in application range; and the cable can be clamped in five directions, so that the clamping force is more uniform, and the clamping degree is higher.

The invention discloses a fire resisting cable for electric power transmission. A fire-resistant insulation principle of a mineral insulated cable is fully utilized, and a copper tube sleeve in the mineral insulated cable is replaced by a basalt fiber wrapping material with a higher melting point and a higher electrical insulating property under the condition of maintaining the fire-resistant insulation principle, so that the fire resisting cable provided by the invention has higher fire resistance and high temperature insulation under higher burning temperature; the outer basalt fiber cloth cover is soft and can be turned outward; before magnesia powder is filled, the free end of the outer basalt fiber cloth cover along the length direction is turned outward, inner and outer surfaces are exchanged, the outer basalt fiber cloth cover is matched with the a mold pipe, and a short to-be-compressed space is formed in the mold pipe, so that a compressing pipe or similar compressing device can smoothly get in and out of the mold pipe for compressing; and after the compressing, the pulling or rolling is not required, so that the time and labor are saved, the manufacturing technique is simplified, a large amount of cost is saved, and theoretically, the extracting length of the fire resisting cable is not limited.

The invention relates to an apparatus for detecting molten slag content in a liquid metal injection flow. The apparatus comprises an annular electromagnetic sensor, a signal cable and a signal processor, wherein the annular electromagnetic sensor comprises a metal housing, a receiving coil, a compensation coil and an emission coil, the receiving coil, the compensation coil and the emission coil are sequentially arranged from the inner ring to the outer ring, and are prepared by winding a single core mineral insulated cable. The apparatus has the following characteristics that: the preparation process of the annular electromagnetic sensor is simple, the material cost is reduced, the production cycle is shortened, and the service life is prolonged.

A cable assembly for a flame sensor apparatus includes an inner conductor electrically connected to a photodiode that generates a current. The inner conductor transmits the current from the photodiode. A first insulating layer circumferentially surrounds the inner conductor. The first insulating layer includes a mineral insulation material. An inner sheath circumferentially surrounds the first insulating layer. The inner sheath includes an electrically conductive material. A second insulating layer circumferentially surrounds the inner sheath. The second insulating layer includes a mineral insulation material. An outer sheath circumferentially surrounds the second insulating layer. The outer sheath includes an electrically conductive material. The cable assembly is for use in temperatures up to about 300 degrees Celsius or greater. A method of attaching a cable assembly for a flame sensor apparatus is provided.

The invention discloses an anti-aging and anti-cracking sheath material for a mineral insulated cable and a preparation method thereof. The sheath material comprises the following raw materials in parts by weight: 40-60 parts of EVA resin, 10-20 parts of high-density polyethylene, 2-4 parts of maleic anhydride grafted high-density polyethylene, 1-2 parts of maleic anhydride grafted ethylene-1-octene copolymer, 40-60 parts of modified magnesium hydroxide, 10-20 parts of modified mica powder, 5-10 parts of modified potassium titanate whiskers, 1-2 parts of a weather-proof agent, 1-1.5 parts of an antioxidant and 1-2 parts of a lubricant. The sheath material has the advantages of excellent insulating property, ageing resistance, cracking resistance, high mechanical strength, good flame-retardant and smoke-suppressing effects and very high use safety, and can play a very good role in protecting a mineral insulated cable.

The invention relates to the technical field of cable materials, and particularly relates to a mineral oxygen insulation material composition for a flexible mineral insulated cable and a preparation method of the mineral oxygen insulation material composition. The mineral oxygen insulation material composition is prepared from the following components in parts by weight: 30-55 parts of inorganic adhesive, 20-70 parts of flame retardant, and10-50 parts of inorganic filler. The preparation method comprises the steps of weighing proper amounts of the above components; mixing the components uniformly by using a stirrer; and finally extruding and shaping by using a silicon rubber extruder, so as to obtain a finished product. The finished product prepared by the method resists fire, expands whenbeing heated, and generates a porous, highly foaming ceramic thermal resistant material, a hard ceramic shell in the cable can well resist flame and fire, isolate fire and prevent fire, so as to keepa circuit complete, and the mineral oxygen insulation material composition is mainly applied to medium and low voltage fire-proof fire-resistant cables. The oxygen insulation material meets the requirements of TICW 8-2012 fire-resistant insulation layer completely, the prepared cable meets the C.W.Z level of requirements of a BS6387 standard, that is, fire resistance at 950DEG C, spraying, vibration test and the like.

The invention discloses a filled magnesium oxide mineral insulated cable and a preparation method thereof. The preparation method comprises the following steps of: (1) calcining heavy magnesium oxide powder at a high temperature of 850-950 DEG C to remove impurities, then uniformly mixing the calcinated heavy magnesium oxide powder with potassium tetrafluoroaluminate powder, and placing the mixture in a heat preservation furnace for heat preservation; (2) putting a required wire core material into a copper pipe on an assembly table for blank assembly, and fixing one end of the copper pipe; (3) before filling, adopting a magnetic separator to remove magnetic metal inclusions, then pouring the mixed powder into a gap around the copper core in the copper pipe, and using a tamping mechanism for tamping the mixed powder until the mixed powder is filled well while pouring is conducted; and (4) subjecting the wire core copper pipe filled with the mixed powder to stretching, annealing, stretching again and annealing again until a wire core copper pipe meeting the design specification and size is stretched out. The problems that an existing magnesium oxide powder automatic filling method is low in compactness and poor in impact resistance and uniformity are solved.