Extruded cable, harvesting and method for its manufacture
(57) Abstract:The invention relates to extruded cables, method of their production and harvesting, used for the manufacture of extruded cable this way. Extruded cable contains many of the conductors making up the cable. The conductors are located at a certain distance from each other and to the sheath around the conductors plated plastically molding composition. The invention makes it easy to repair the cable and increase its flexibility. 5 C. and 21 C.p. f-crystals, 12 ill. The invention relates to extruded cables, method of their production and harvesting, used for the manufacture of extruded cable this way.The shape of the produced electric cables, types of conductors, number of conductors, insulation types and their configuration is very diverse. Electrical conductors can be as simple as a single conductor with a simple insulator on the outside - or they can be very complex with many conductors of various sizes and types with a variety of end fittings cable (cable boxes) or output points along the length of the cable. Cables can also have different continine this cable. Electrical cables of a certain type are used in almost every device that is part of each electronic or electrical device. Cable is required for connection of power supply, electronic devices and for supplying and transmitting electrical signals to another electronic device, measuring devices, meters, lights or other visual indicators to establish communication between devices and to coordinate actions. In each case, when generating or transmitting an electrical signal or current from one device to another, as a rule, use electrical cables. Usually, when passed a large number of signals or currents between devices in the most modern devices and equipment are conventional electrical cables with a large number of conductors and with a large number of terminations cable. Traditionally made of electrical cables used in cars, trucks, airplanes, jet engines, missiles, and other military equipment, computers, TVs, some types of telephones, stereos and in almost any conceivable device using a lib in several ways. Usually a large number of conductors are enclosed in a casing or shell. The shell can coil or pressoffice several known in the art methods. The method of compression used in the manufacture of cable with a large number of conductors surrounded by some form of the molding composition. The cable can be run in one of several configurations. The cable may be a flat or, in most cases, all the tape. Many conductors can all follow each other, or they can oborachivatsya one around the other in a specific pattern, depending on the particular application and type of conductors. In one of the famous examples of the application of the electric cable cables are woven in a specific pattern so that the main wire was oplease wire, not bearing signal. This provides protection from interference generated by other signals. Wires do not carry signal may be a current-carrying conductors or ground wires. Twisted wire then in most cases, wrapping themselves in the insulating material. Specific devices with conventional cables often have conductors included in the cable and Vykhodtsev are often made on a particular type mandrel, designed specially for this specific case. The wires are arranged individually or in groups along the mandrel. Each of these wires or each of these groups of wires are added to the cable at specific points, leaving the plot sufficient length of cable to zakonczonego device that allows you to connect it zaranzowany device with any electrical device. When all the wires are in the correct order, the cable oborachivaetsya insulating material or subjected to a process of pressing, in which the cable is covered with an insulating material. In this case, the insulation material is often completely fills all voids between the wires and completely covers the wire forming the outer insulation around the cable.Cables, lime previously in the art have several disadvantages. If the cable consists of a set of conductors, it is very difficult to repair a separate conductor. As a rule, you must remove the outer insulation of the cable on the plot is quite considerable length in order to localize the damage and often remove completely from end to end, if the conductor must be replaced. If the conductors are part of the braid any recompression shell, it will be impossible to remove or repair a single conductor, without destroying the integrity of the cable. Another disadvantage is the considerable weight of the insulation material used in the manufacture of the cable. In some cases, the weight of the insulation material may exceed the weight of the conductors in the cable. Some applications of the electric cable can be risky. This is especially true for devices using the cable that can move, such as cars, airplanes, space ships and other military and non-military purposes. In U.S. patent N 5331115 issued to Brando, we offer extruded cable and the manufacturing method for avoiding the above disadvantages. In this patent the extruded cable with braid is made using the technology of injection molding. This means that many of the wires or conductors are placed in the mold, followed by a step of molding, resulting in harness of these conductors and molded cable. One disadvantage of this process is the negative influence of the stage of molding the conductors and wires. Therefore there was a need to improve travesta in one embodiment, the present invention offers a new and improved method of pressing with the use of blanks, which can be removed for inserting the desired conductors. In another embodiment, the present invention proposes an improved structure of a loom for extruded cable.The purpose of this invention is the implementation of the extruded cable and method of manufacturing electric cable, devoid of some of the shortcomings of cables, known previously.Another purpose of this invention is the implementation of the extruded cable, total weight of which is considerably reduced compared to currently known similar cables. The next objective of this invention is the implementation of the extruded cable in which a single conductor inside the cable can easily be removed, repaired, or removed without damaging the integrity of the entire cable.Another objective of this invention is the implementation of the extruded cable with a greater degree of flexibility.Another purpose of this invention is to implement an improved method for the manufacture of extruded cable with blanks.Another purpose of this invention is the implementation of the extruded cable, in which a diamond is placed.To accomplish the above objectives of this invention and realizing the benefits of this invention implements the extruded cable with many conductors forming the cable, and these conductors are located at some distance from each other. These conductors are covered plastikkarten molding composition, plated in a braid.In another embodiment of this invention, the braid can be made with a number of channels passing through, for inserting the conductors after the braid is made.The braid is preferably of the opposite end parts and the side parts with the braiding part passing between them. Next braiding part contains numerous veins, these veins pass between the opposite end parts and intersect each other, forming diamond-shaped openings. At each crossing pair lived is the channel through which passes at least one conductor.In another embodiment of the invention a method of forming extruded cable includes the steps of creating presets that mimic many conductors, realizing the mold with pressure surfaces for the insertion of blanks and dnovo cable, covering the workpiece. Then the workpiece can be removed from the harness with molded cable, then there remain a number of longitudinal, coming one after another of the channels in the sheath for inserting conductors in them. The blank is preferably made of a material that does not stick to the molding composition when extruded cable harness, for example polyurethane or silicone of different hardness.In yet another embodiment, the present invention proposes a workpiece for the manufacture of this invention, molded cable. This preparation consists of many veins, each vein must be the exact length and the exact diameter. It is also proposed wire connector, which is mounted preferably perpendicular to the longitudinal direction lived. In one embodiment, wire connector is pressed to the cores, so that he covers, with wire connector is located near the end of the lived. In practice, the workpiece is placed in the mold before the injection molding of the cable harness. Cable harness pressed around. As soon as the cable harness has hardened, the mold is cooled to room temperature, this cable harness/billet removed from the mold, and the preform after ostavlyaete this invention features extruded cable and method of manufacture and, more specifically, the cable for electrical conductors, in which plastically material is shrinked around each conductor.The above aims and distinctive features of this invention will be easier to understand and appreciate from the following detailed description of the basic variant of the invention selected for illustrative purposes and disclosed involving accompanying drawings.Reference is made to the drawings of the present invention.Fig. 1 is a top view of a molded cable, showing the many conductors with indication conductors, excitatory (magnetizing) cable at various points.Fig. 2 is a bottom view of the beginning of the extruded cable.Fig. 3 is a cross-section of extruded cable.Fig. 4 depicts the mold, which is extruded cable.Fig. 5 depicts the mold used for the manufacture of extruded cable according to this invention.Fig. 6 is a perspective view of another embodiment of the invention, showing extruded cable, which is used braid on the image.provides a top view of a typical workpiece according to this invention.Fig. 11 is a top view of another embodiment of extruded cable using braid in accordance with a pattern.Fig. 12 is a perspective view of a part molded cable according to Fig. 6, enlarged for convenience.Referring to the drawings Fig. 1 to 3, we see that these are the preferred options indicating the main characteristics of the extruded cable according to the present invention. Extruded cable 10 according to this invention usually contains many conductors 12 that are separated from each other plastikkarten composition 28.The preferred option and the best view of extruded cables and method of manufacture this invention disclosed in this document. However, it should be noted that the best way to embodiments of this invention disclosed herein are offered only as illustrations and not as limitations. Did you mean that the whole range of claims of the present invention shall include all modifications, which include all the main features of the design.In extruded braided cable 10 of the present invention may consist of three conductors to an almost unlimited their tebuetsya more than one layer. Typically, the conductors 12 are first conductor 14 and second conductor 16 and so on until the last of the conductor 18. The conductors 12 are held at a certain distance from each other using plasticoated composition 24, alternating with conductors 12 in the figure, the braid 30. Preferably, plastically composition 24 was a molding composition which can be applied in the molten state, or it can be a structure consisting of two parts, such as polyurethane with a hardening substance.For greater clarity, the figure braid 30 plasticoated composition can be represented as a narrow band 28 plasticoated composition 24. However, in the preferred embodiment, these narrow ribbon 28 is actually formed by the method of injection box moulding composition (injection molding) into the mold, forming a figure braid 30 along the entire length almost simultaneously. First, this plastically composition forms a primary base 26 around the conductors 12 near the starting end 20 of the cable with an extruded sheath 10. This allows you to secure all the ends 20 of the conductor 12 at a distance from one another. Then narrow strip 28 is braided around the first conductor 14, prepar conductor 18. A narrow strip 28 is then braided around the last of the conductor 18 parts and braid in the opposite direction of the conductors 12 in the reverse order to the first conductor 14, weaving these wires together and hold them at a certain distance from each other. Figure braid is repeated until the end point 32. A narrow strip 28 then generates the final base 34 around all conductors 12 which terminate near the end point 32. The initial base 26 and the target base 34 fasten all wires together so that there is a certain distance between them in the beginning and at the end of the extruded cable 10. Without bases 26 and 34 of the conductors 12 will have the opportunity to move freely in the transverse direction until the first braided strips of plasticoated composition. This could lead to weakening of the structure with molded cable at these points. There are an almost unlimited number of configurations that can be composed using extruded cable 10 and its method of preparation according to this invention. As shown in Fig. 1 and 4, there is one primary 20 and three separate endpoint 22. For each case of application is determined by the exact configuration of the cable, colout in mind the limitations of the scope of the invention and the range of its application. In each specific application can have many inputs and outputs. In addition, the same device may be a lot of cables, each of which is a different configuration.With the use of extruded cable according to this invention are achieved significant benefits. These include: increased flexibility, weight loss and the ability to repair the conductor inside the cable.Because the conductors are not fixed, but is completely sealed inside the shell is either braided or laminated - these conductors have more movement. The wires can slide between the narrow strips 28 inside figure braid 30. This gives the cable a greater degree of flexibility than any of the previously known types of cables.As plastically composition covers only about half the surfaces of the conductors 12, and the space between these conductors are not filled, the material need only half or less. Because you are using only half of the material, the weight is greatly reduced.It is possible to repair the conductors 12 within the extruded cable 10. This is due to the fact that the conductors 12 within the cable 10 is to see. Therefore, the area that is causing suspicion, you can easily examine and have it easily accessible. One or more conductors can be removed from figure braid 30 and re-insert them without damaging the integrity of the cable. In the famous cables to be impossible. Generally, in the known cables in order to see and get a conductor located in the cable, it is necessary to remove or tear the membrane. Therefore, in most cases, the cable rather replace, not repair.As previously noted, in the preferred embodiment, plasticopedia composition 24 is a molding composition. As shown in Fig. 4, figure braid 30 in the preferred embodiment, is formed by way of injection molding, although it is possible to use other appropriate methods of compaction. The main hole injection box indicated by the numeral 36. The molding composition is injected into the main hole injection box 36 and flows through the channel injection box 38 to separate holes for injection box 40. As shown, in the preferred embodiment, each individual hole injection box 40 forms two narrow strips 28 of plasticoated composition. In this design all the individual holes in the not 28 should be formed at the same time.Excess molding composition exits through outlet 42 on the opposite side of the extruded cable 10 from separate holes for injection box 40. The process of manufacturing molded cable 10 should not stop, until all the excess composition from all individual holes for injection box 42. This ensures that formed all narrow strip 28 to remove the mold 50. The first stage in the manufacture of extruded cable 10 according to this invention is the creation of the mold 50 shown in Fig. 5. The mold 50 can be manufactured in various ways known in the art. Mold 50 should have slits 52, figure braid 30, the hole injection box 40 and the outlet 42. The slots 52 must meet the size, quantity and the desired configuration of the conductors 12 and the end of the manufactured cable 10. Mold 50 should also have the main hole injection box 36 where the molding composition. In the preferred embodiment, should be the main hole for injectione 36, leading to the channel for injection box 38. Separate holes for injection 40 coming from the channel for injection box 38, will nourish the figure op the I. There should also be an area interrupt circuit 44 for the initial base 26 and the area of the interruption circuit 46 to the end of the base 34.When the mould is ready, the next step is the installation of conductors 12 in the slots 52 and Assembly execution mold 50 - conductors 12 and preparing her to injectioni molding composition.Then, the molding composition is injected into the main hole injection box 36 by any currently known means. This molding composition should flow through the channels of the injection box 38, a separate hole injection box 40 and in figure braid 30. When the pattern of the braid is completely filled, the excess molding composition will be released through the outlet 42.Then, depending on the particular molding composition, can begin the curing cycle, which will allow the correct positioning and otvetit molding composition. After curing properly the mold 50 can be removed, leaving the extruded cable 10. Excess and spilled the composition should be wiped, getting completely manufactured and processed products.In Fig. 6 another option is extruded cable according to this invention designated by the numeral 60 and includes KAB is NTE.Cable Assembly 61 has opposite end parts 63 and the opposite side portion 65. Some of the partitions 67 is located on the periphery and formed end and side parts. The wiring 61 may also have lugs 71, which facilitates the Assembly of the harness to a specific device. You can use a different configuration of lugs depending on the end use, and this lug can be positioned at any point harness.In Fig. 6 to 9, the end portion 63 of the loom contain spaced channels 73, which have dimensions that allow you to insert in each channel, one or more conductors.In Fig. 6 and 12 part jumper 67 is made from a range of lived 75, which take place inside the peripheral part of the harness 61. Each lived 75 passes between the end part and a lateral part. The conductor 75 is inclined at an angle to each other and to the end and side portions 63 and 65, forming diamond-shaped openings 77. Together with the formation of diamond-shaped holes 77 75 veins form an overlapping portion, indicated by numeral 79. The location of each intersection is the channel 81, which is formed during the forming process and has a size to allow insertion of the wire conductors for making the final pressovanne lived contains a short segment 83 between adjacent intersections 79 or one of the end or side portions of the harness 61. The cross-section of a loom according to this invention in Fig. 7 to 9 depict the ratio between the segments 83, channels 81 and intersections 79. Within the scope of claims of the present invention the holes 77 can have a diamond-shaped, or any other shape, for example oval, square, etc.The channels 81 79 crossing and channels 71 in the final part 63 are located on the same line, forming longitudinal passages 85 through the harness 61 for one or more conductors. As mentioned earlier, cable Assembly 61 can be made of wire already in the aisles 85 or, in another embodiment, as will be shown below in more detail with the help of the workpiece after removal of the block and inserting conductors.In Fig. 11 shows another configuration of the extruded cable, indicated by the numeral 60'. This configuration shows that with the extruded cable according to this invention can be used in various configurations and types of end parts 63' or lugs 71' depending on the particular application. Extruded cable 60', shown in Fig. 11 is a configuration typical for the respective surfaces of the mold used in the manufacture of extruded cables. That is, the behavior of the ri manufacture of extruded cable 60 with conductors, properly installed, you should perform a pressing process for manufacturing braided cable described above. This means that the extruded cable 60 is formed of conductors situated properly.In another embodiment, a cable Assembly 61 can be made using the blank shown in Fig. 10. In this way, the cable harness 61 first made by compressing with the workpiece. This preparation then you can remove and replace the required number of conductors, thereby forming extruded cable.Shown as an example in Fig. 10, the workpiece indicated by the numeral 100 and includes a large number of billet lived 101. These billet veins are located across one line and connected wire connector 103. This wire connector preferably is molded under pressure and repressively directly to billet cores 101 in the manufacture of the workpiece. Preferably, the workpiece 100 has formulas of the molding composition, such as plastic, for example polyurethane varying degrees of hardness or silicone varying degrees twenty. In another embodiment, the workpiece 100 can be made of metal, such as stainless steel with metallicity of metal, and non-metallic veins.Wire connector 103 may contain a cavity 105, which facilitates placement of the workpiece when it is used for manufacturing the cable Assembly 61.It should be understood that the wire connector 103 may have any configuration or shape and may be located at any point along the length of the core. As shown in Fig. 10, the length of the veins gradually increase so that by using the workpiece 100 in the mold shown in Fig. 11, the ends of the billet lived 107 end approximately in line with the end part of the extruded cable 60'.The workpiece 100 is preferably manufactured by way of injection molding, and cast it so that all the wires were located across on the same line. Or in another embodiment, disposed in a circle, similar to the configuration shown in Fig. 11.In the method of manufacturing the cable Assembly 61, the workpiece 100 is first placed in the mold. Preferably, this mold consisted of two halves with the workpiece, from the outset, located on one of these halves. The other half of the mold is placed on it, these two halves are closed, is injection molding using the molding composition, n is Asia temperature.After solidification and cooling to room temperature, the mold is opened and the cable harness together with the workpiece removed. The workpiece is then separated from the cable harness, and after this operation in the intermediate portion 67 harness 61 remain hollow tunnels or channels, see Fig. 12.Then these hollow tunnels inserted the necessary electrical conductors for forming extruded cables containing as the cable harness and the electrical conductors. The wires in the harness are in the position of zero voltage and is not exposed to high temperatures, as in the curing process was used procurement. Thus, the service life of the wires increases. In addition, as mentioned previously, each wire can be completely replaced by removing from the cable harness, after which it is replaced by another wire or wires.During the pressing process if desired, you can apply the separating composition to guarantee the separation of the workpiece from the cable Assembly when the product is removed from the mold. In addition, it should be understood that the braiding pattern formed during the pressing process, the cross-sectional lived can take various forms. Napriazena intermediate part you can also change depending on the final part and type of wires, used in Presolana cable. For example, the conductors of large diameter will require the size of the picture braiding part, sufficient for the formation of channels, in which are inserted conductors. Similarly, the conductors of small diameter should be braiding part of a smaller size. In addition, Presolana the cable according to this invention and its method of preparation you can use any number of conductors. The workpiece can have any number of leads, which should coincide with the desired number of conductors in a particular application.Variant shown in Fig. 6 - 12 can have any distinguishing features discussed above with reference to Fig. 1 - 5.Essentially the invention disclosed in terms of preferred option that suits everyone and every purpose of the present invention that have been discussed earlier in this document, and provides a new and improved extruded cable, method of manufacturing and procurement to implement this method.Of course, specialists in the art can make various changes, to carry out certain modifications of the present invention, without departing from its merits and not breaking evemy the accompanying claims. 1. Extruded cable containing multiple wires constituting the cable, characterized in that the conductors are located at a certain distance from each other and to the sheath around the conductors plated plastically molding composition.2. Extruded cable under item 1, characterized in that the molding composition is a silicone.3. Extruded cable under item 1, characterized in that the molding composition is a polyurethane.4. Extruded cable under item 1, wherein the braid includes opposite end portion, the opposite side parts and braiding part passing between the end and side portions and around the conductors.5. Extruded cable under item 4, characterized in that each specified opposite end portion has through channels to pass through it, at least one of the conductors.6. Extruded cable under item 4, characterized in that the braid contains many lived, passing between the end portions and intersecting with each other, forming diamond-shaped openings, with each intersection of the pairs of veins contains a channel for the passage of celikovsky molding composition is a silicone or polyurethane.8. The workpiece for the manufacture of extruded cable, characterized in that it contains many billet lived with a certain length and diameter, wire connector, attached, preferably transversely to the longitudinal orientation to a given set billet lived and located near the end part of many billet lived, with many billet lived and wire connector made of metal or nonmetallic material.9. Procurement under item 8, characterized in that each billet lived from the specified set is made with the possibility of increasing along the width of the wire connector.10. Procurement under item 8, characterized in that the wire connector includes means for actuating the mold for the manufacture of extruded cables.11. Procurement under item 10, characterized in that the means for actuating consist of at least one plane in the specified wire connector for inserting the protrusion of the mold.12. Procurement under item 8, characterized in that it is made of non-metallic material.13. A method of manufacturing a molded cable, by applying a molding composition, characterized in that the ability to insert the specified workpiece and the second pressing surface for drawing manufacturing braid using a first pressing surface and put the composition in the mold to obtain a harness with molded cable, covering the workpiece, then the workpiece is removed from the harness with molded cable, to keep the number of longitudinal channels in the braid, and received in the channels insert multiple conductors, forming extruded cable.14. The method according to p. 13, characterized in that the establishment of procurement is to obtain a preform having a lot billet lived with each specific length and diameter, and wire connector, prepisovanie to many billet lived and placed near the end of this many lived, with many billet lived and wire connector made of metal or nonmetallic material.15. The method according to p. 13, characterized in that the composition is applied by injection molding.16. The method according to p. 13, characterized in that the workpiece is removed from the loom, creating a transversely directed, arranged in a line channels in the specified wiring harness with molded cable for inserting conductors in them.17. The method according to p. 16, characterized in that the conductors are inserted into these channels, forming extruded cable.18. Harness with molded cable, containing the sheath, wherein the sheath has an opposite end portion, the opposite of the indicated part of the weave have a lot of longitudinally directed, along the same line channels passing through it, for inserting conductors and braid made of plasticoated molding composition.19. Harness with molded cable under item 18, characterized in that each of the said opposite portions has a through hole for passing through at least one of the conductor.20. Harness with molded cable under item 18, characterized in that the specified plastically molding composition is a silicone or polyurethane.21. Harness with molded cable under item 18, characterized in that it contains the workpiece, a portion of which is located in said transversely directed, located on the same line channels.22. Harness molded cable according to p. 21, characterized in that the workpiece contains many billet lived, having each one a specific length and diameter, and wire connector, prepisovanie to a given set billet lived and located near the end of this set of billet lived, with many billet lived and wire connector made of metal or non-metallic material, and each specified billet lived placed inside one of zoommode in the establishment of the mold, characterized in that a mold having slits corresponding to the multiple conductors of a predetermined configuration and a part of the weave that is perpendicular to the specified slots and having multiple holes for injection box moulding composition in the braiding part, mounted many conductors in the slots in the mold, and the conductors are first conductor, second conductor, and so on until the last Explorer, Inuktitut molding composition in these holes for injection box with capability of flow specified molding composition in the braiding part inside the mold, cooled molding the composition to the desired degree of curing and removing the molding composition and the conductors of the mold.24. The method according to p. 23, characterized in that figure braid implements diamond-shaped openings between the intersecting conductors, and the intersection of these veins occur where part of the braid covers the conductor.25. Procurement under item 8, characterized in that it is made of metal.26. Harness molded cable according to p. 22, characterized in that said metal is stainless steel, as specified n
FIELD: electrical engineering; automobile and ship building, mechanical engineering, construction , oil extraction, and oil refining industries.
SUBSTANCE: proposed electric drive has stranded copper conductor with strand sectional area of 1.0 - 50 mm3 and rubber sheath , 0.4 - 7.0 mm thick, made of rubber mixture whose matrix is polymeric mixture of high-molecular polymethyl vinyl-siloxane and low-molecular polymethyl vinyl-siloxane rubber of mole mass of 20 -70 thousands in combination with silica powder, quartz, anti-texturing agent in the form of αω-dihydroxide methylsiloxane and organic peroxide. Rubber mixture is applied by extrusion at speed of 0.2 - 2 m/s and cured under radiation-chemical curing conditions with aid of cobalt gun incorporating γ-radiation source at dose rate of 2.5 - 20 megarad. and/or by thermal curing. Electrical conductor produced in the process is capable of fire self-suppression and is suited to operate at -60 to +300 °C.
EFFECT: enhanced fire, crack, oil, and gasoline resistance, improved electrical and physical characteristics.
3 cl, 1 tbl
FIELD: cable engineering; plastic-covered sector cables.
SUBSTANCE: proposed extrusion head that provides for regulating insulation thickness over perimeter of sector cable cores has body, mandrel holder, mandrel with cylindrical part, die, mandrel evacuation device, and device for positioning conducting core in mandrel; two cuts symmetrical relative to vertical axis of mandrel are made on external surface of its cylindrical part; these cuts are disposed so that fixed radiant position of sector in mandrel is ensured and its rays originate from geometric center of mandrel and cross points limiting left- and right-hand rounding of sector; angle between symmetry axes of cuts is not over 180 deg.; angle of cuts to generating lines of cylinder is minimum 1 deg.
EFFECT: reduced material input of cable.
1 cl, 3 dwg, 1 tbl
FIELD: electrical engineering; drying cable insulation in servicing communication lines.
SUBSTANCE: proposed electroosmotic method for drying paper insulation of cable involves setting-up of electric field; in the process cable conductors are connected to positive pole of current supply, metal electrodes whose quantity depends on that of cable conductors are inserted in paper insulation at open end of cable and connected to negative pole of power supply; damp cable section is cut off. Used as metal electrodes are aluminum or copper strips deepened through 2 m. Voltage of 500 - 2500 V is applied for 6 - 8 h.
EFFECT: enhanced cable saving due to reduced size of cut-off ends.
FIELD: electrical engineering.
SUBSTANCE: invention relates to manufacture of electroconductive materials by way of applying electroconductive coating, impregnated-paper insulation, and electroconductive threads of power cables onto paper base. In particular, material consists of natural paper base and electroconductive layer, whose thickness constitutes 0.03-0.14 that of insulation layer placed on paper and composed of aqueous suspension of carbon black (6-10%) and polyvinyl alcohol (1.0-4.0%) together with additives of acrylic acid ester/methacrylic acid ester copolymer (7-12%) and oxyethylated (with at least 7 ethylene oxide groups) alkylphenol or sodium polyacrylate (0.1-0.5%).
EFFECT: improved workability, electrical conductivity, strength, elasticity, heat resistance, moisture resistance, and resistance to splitting within cable.
FIELD: electrical engineering; electric cables for signaling, control, and data transfer and processing systems.
SUBSTANCE: cable has at least one pair of insulated and stranded current-carrying conductors and cable sheath. Insulating material is either halogen-containing polymer (polyvinyl chloride), or halogen-free polyolefin base material (polyethylene), or its copolymer. Insulation thickness is chosen from equation strand pitch is found from equation h = 25(2Δ + d), where d is conductor diameter; εr is relative dielectric constant of insulating material. With diameter of cable current-carrying conductors being enlarged, capacitance of cable pair was reduced (other characteristics being retained at desired level.
EFFECT: enhanced capacitance of working load on cable pair.
1 cl, 4 dwg, 1 tbl
FIELD: electrical engineering; producing long conductors around superconducting compounds.
SUBSTANCE: proposed method includes formation of single-core billet by filling silver sheath with bismuth ceramic powder; deformation of this single-core billet to desired size by no-heating drawing at deformation degree per pass of 0.5 - 20%; cutting of deformed billet into measured parts; assembly of single-core billet by disposing desired quantity of measured parts of deformed single-core billet in silver sheath of multicore billet; extrusion of multicore billet at temperature ranging between 100 and 200 °C and at drawing coefficient of 4 to 30; air rolling without heating at deformation degree per pass of 1 - 50%; thermomechanical treatment including several heat-treatment stages at temperature of 830 - 860 °C for time sufficient to obtain phase of desired composition and structure in ceramic core with intermediate deformations between heat-treatment stages at deformation degree per pass of 5 - 30 %.
EFFECT: enhanced critical current density due to sequential packing of ceramic core; facilitated manufacture.
1 cl, 1 ex
FIELD: controlling electric cable sheath capacitive reactance.
SUBSTANCE: proposed method for controlling capacitive reactance of tubular sheath formed by means of extrusion of insulating compound on electric cable in extrusion head includes introduction of foaming agent in insulating compound so as to enhance capacitive reactance of tubular insulating sheath; prior to do so, definite amount of foaming agent is used so as to obtain predetermined capacitive reactance for tubular insulating sheath and in order to ensure precision control of capacitive reactance of tubular insulating sheath, gas pressure is applied to at least external surface area of insulating compound extruded by extrusion head, gas pressure being varied so as to control capacitive reactance value of tubular insulating sheath.
EFFECT: enhanced precision of controlling capacitive reactance of electric-cable sheath.
9 cl, 3 dwg
FIELD: electrical engineering; cable filler compositions.
SUBSTANCE: proposed PVC base composition designed for filling conductor-to-conductor space of electric cables by extrusion has following ingredients, parts by weight: divinyl-styrene thermal elastomer, 100; high-pressure polyethylene, 40 - 60; mineral oil, 80 - 95; chalk or kaolin, or aluminum hydroxide, 100 - 50.
EFFECT: enhanced fluidity index and frost resistance; ability of retaining cable flexibility at sub-zero temperatures.
FIELD: multiple twin cables for communications in local network.
SUBSTANCE: proposed multiple twin cable designed to prevent vapor transfer when immersed in petroleum oil has internal and external sheaths that cover insulated signal-transferring conductors and are made in the form of helical structure. Core filler fills up core and spaces between signal transferring conductors. Core filler and internal sheath are made of vapor-tight material and fixed to insulated conductors so that they fill up all grooves and slots around signal transferring conductors. External gas-tight sheath can be provided to make it possible to immerse cable in petroleum oil for long time intervals without impairing its functional capabilities.
EFFECT: ability of preventing vapor transfer lengthwise of cable.
26 cl, 4 dwg