Cable insulation stitching device

FIELD: cable industry; production of polymeric items.

SUBSTANCE: proposed device has frequency changer, high-voltage transformer, gas-discharge reactor, photoelectronic multiplier with display unit, polarized degree-of-stitch and its uniformity indicator, and reactor gas mixture pressure build-up and maintenance unit. Sectionalized gas reactor of type depending on cable thickness is used, each reactor section having variable-diameter quartz glass tube; these tubes are installed in tandem and cable conductor covered with insulation applied by extrusion is passed through them. Compressed inert gas (nitrogen or argon) is supplied to tube of each reactor from gas cylinder at pressure of 10 at. Attached to external wall of quartz tube are conductive metal electrodes and industrial- or high-frequency (50, 150, or 300 Hz) AC voltage of 10 to 70 kV is applied across them. Metal current-carrying conductor of cable functions as gas-reactor central grounded electrode.

EFFECT: facilitated procedure and enhanced safety of stitching cable polyethylene and polypropylene using industrial method.

1 cl, 3 dwg

 

The present invention relates to the effects of ionizing radiation, electric fields and electric discharges on high-molecular polymer compound and can be used in the cable industry and in the production of polymeric products.

It is known that under the influence of radiation, electron and gamma-irradiation and UV light degradation and cross-linking of the polymer macromolecules.

Know the influence of an electric field, temperature, x-ray and gamma radiation on propylene /Salina A.G., Yale I.I., Fighters A.A., Butow VP the Influence of an electric field, temperature, x-ray and gamma-irradiation on the molecular weight distribution polypropylene dielectric. Modern problems of Electrophysics OKB "Novik". - St. Petersburg, 1992, C-146/. It is shown that the influence of an electric field leads to the degradation of macromolecules, increasing with increasing electric field intensity.

The closest analogue is a device for receiving slivaushiesia granulated cable polyethylene under the influence of an electric gas discharge /patent RF №2250912 C08J 3/28, C08L 23/06, 2005/. The device consists of a cylinder made of quartz glass, high-voltage metal electrode, the metal grounding screw for mixing the irradiated pellets and IVN-source high level of the AC voltage. Granular polyethylene is placed in a glass reactor, on the outer wall of which is coated with a conductive metal electrode, which will be supplied to high voltage. In the Central part of the glass reactor is grounded metal screw that serves as a second grounded electrode. High AC voltage of 40 kV is applied to the high voltage electrode.

The disadvantage of this device is that a large sample thickness and the proximity of the position of the corona electrodes to the surface of the sample make it difficult to use the device for processing granular polymers in the cable industry. In addition, the device does not cause crosslinking of polymeric cable insulation material.

Object of the present invention is to provide a device that allows cable knit polyethylene and polypropylene is quite simple, secure, industrial-applicable method.

This objective is achieved in that the device for crosslinking polyethylene, PVC and polypropylene cable insulation using an electric gas barrier discharge, including the gas reactor in the form of a quartz tube, on the outer side where the high-voltage electrodes, the gas reactor of you who olden as sections, connected in series, to which the transformer is connected to the frequency Converter, and the device additionally introduced shaper gas medium in the reactor.

The fusion process is PE, PVC and PP cable insulation occurs in the reactor gas barrier discharge under the action of ultraviolet radiation barrier gas discharge. The device can handle cable polyethylene, polypropylene and PVC insulation by exposure to ultraviolet radiation electric gas barrier discharge involves feeding an AC high voltage to the high voltage electrode containing a restrictive high-resistance dielectric gasket made of quartz glass (dielectric barrier). Crosslinking of polyethylene and polypropylene is produced by irradiation of UV-radiation barrier gas discharge in the discharge vulcanizer in an inert gas (nitrogen, argon or helium) at a gas pressure of 10 ATM.

The block diagram of the gas discharge vulcanizing facility is presented in figure 1. The installation consists of a frequency Converter (50, 150 and 300 Hz) 1; high-voltage TRANS-formator 2; discharge reactor 3; the photomultiplier tube with the display unit 4, 5; polarization indicator of the degree of crosslinking and its homogeneity 6 and shaper maintain doublenegative environment in the reactor 7.

The use of a photomultiplier tube with a display unit allows you to exercise effective control over the discharge process of vulcanization to register initial voltage ignition barrier discharge and to determine the intensity of UV radiation in the reactor installation.

Figure 2 presents a block diagram of one section of the gas reactor vulcanizer for crosslinking polymeric cable insulation using an electric gas barrier discharge: where 8 - conductor; 9 - Pol isolation TPG; 3 - quartz tube with voids 10 - sealing glands; 11 - high-voltage electrode; 12 - gas compression chamber; 13 - protective insulating housing with UV reflector.

Each section of the gas reactor is a thin-walled quartz tube 3 (3 mm thick), well which is UV-electric barrier discharge. High-voltage barrier discharge UV radiation occurs in the gas gap between the high voltage electrode 11 and the conductive housing of the cable 8. Constant gas pressure in the reactor is created using the driver maintain the pressure of the gas environment in the reactor 7, including gas cylinders, compressor and vacuum pump, and is supported by a rubber sealing gasket 10.

The device operates as follows.

Depending on the thickness of the cable which I use gas reactor multi-section type, each section consists of quartz glass tubes of variable diameter, arranged in series, through which extends a conductor cable 8 overlay extrusion method PE or PP cable insulation. In each pipe of the reactor 3 is fed compressed inert gas (nitrogen or argon) from the gas cylinder under the pressure of 10 ATM. On the outer wall of the quartz tube are attached to the conductive metal electrodes 11 to which is fed a high AC voltage (10 to 70 kV) industrial or high-frequency (50, 150 or 300 Hz). Central grounded electrode gas reactor is a metal conductor cable 8. High voltage 10-70 kV is applied to the high voltage electrode 11. The gas pressure in the reactor is maintained by means of two rubber seals 10. In a quartz tube reactor are specially made void, in which the gas is fed under pressure and where lit high-voltage barrier gas discharge (source of UV radiation for the fusion process PE and PP cable insulation). In order to isolate personnel from high voltage quartz tube plasma reactor is placed in a protective insulating casing 13 in the form of thick-walled pipes made of PVC.

The degree of crosslinking of the polymer isolation and homogeneity sshi the key is controlled by the polarization method and is determined by the formula

where Vnvol.and Vvul.values electret voltages to devulcanizing and vulcanized polymeric insulation; N is the concentration of polar relations; Vp- the polarization voltage; P - pressure gas environment; ρ - density polymer material; j is the current density polarization.

Studies of the effects of atmospheric parameters on the fusion process of polymeric cable insulation barrier gas discharge showed a significant influence of the gas pressure. It was found that if the fusion process is carried out at low pressures (less than 0.5 ATM), in polymeric insulation observed rapid formation of gas bubbles. In the discharge vulcanizer presented in figure 2, the vulcanization process PE, PP and PVC insulation possible when changing the gas pressure in the range from 0.5 to 10 ATM. When the pressure of the gas environment of 0.5 ATM, the fusion process occurs already at relatively low voltage to high voltage electrodes 9 (the voltage of the beginning of the vulcanization 5 kV). However, in this case, as shown by measurements made using an optical microscope-MIN-8 (an increase of 800), isolated gas bubbles are formed, which reduce the quality of the polymeric insulation.

Increasing the pressure of the gas environment in the reactor to ATM causes the process of vulcanization of the cable insulation in this case starts from a higher value of the operating voltage source 10 kV. However, in this case, the number of gas bubbles in isolation becomes much smaller. Studies of the curing process at elevated pressures has shown that when the gas pressure in the reactor 10 ATM in polymer PE, PP and PVC insulation already there is practically no gas bubbles. For this reason, the pressure of the inert gas environment (Ar, N2He may be deemed optimal pressure for crosslinking polymeric cable insulation using an electric gas barrier discharge.

Figure 3 presents the results of determination of the polarizability Ve=f(t) PE, PVC, PP cable insulation of different thicknesses h depending on the time of vulcanization to6pin the electric barrier gas discharge (V=30 kV, P 1 ATM). Curve 1 - h=120 μm; curve 2 - h=240 μm; curve 3 - h=360 μm. From figure 3 it is seen that with increasing thickness increases and the time of vulcanization of the polymer isolation barrier discharge.

This device allows for stapling cable polyethylene and polypropylene is quite simple, secure, industrial-applicable method.

Device for stapling the cable insulation using an electric gas barrier discharge, including the gas, R is the actor in the form of a quartz tube, on the outer side where the high-voltage electrodes, characterized in that the gas reactor in the form of sections, connected in series, to which the transformer is connected to the frequency Converter, and a device for stitching additionally introduced shaper gas medium in the reactor.



 

Same patents:

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19 cl, 5 dwg, 2 tbl, 1 ex

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22 cl, 27 dwg, 3 tbl

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13 cl, 5 dwg, 1 tbl

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2 cl, 2 dwg

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Electric cable // 2256969

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