RU2080183C1 - Gear for electric pulse break of materials - Google Patents

Abstract

FIELD: mining industry. SUBSTANCE: secondary winding of L.I.T. is manufactured in the form of several tens of pairs of single-turn windings. In each pair low-voltage ends are grounded: first one through high-voltage inductance, second one through high-voltage capacitance and high-voltage inductance. All inductances are shorted by controlled dischargers. In point of connection of capacitance and inductance all pairs are connected to GIT through controlled discharger. Dischargers are controlled by timer and counter of selection of pair. EFFECT: possibility of usage of only one L.I.T. for simultaneous operation with large number of distribution objects, twice increased degree of disintegration of complex dielectric materials thanks to enhanced voltage across GIT. 1 dwg

Description

 The invention relates to electropulse technology and can be used in the mining industry for crushing ores and other areas in which electropulse technology is used.

Known electric pulse installations, including a high-voltage pulse generator (GIN) according to the Arkadyev-Marx multiplication scheme, connected through a spark gap to a high-voltage electrode immersed in a grounded container with technical fluid [1]
The disadvantage of such installations is the limited possibility of varying the energy input mode and the very high inductance of the series-connected arrester, the large duration of the fronts of high-voltage pulses, the low frequency of their connection, low efficiency. and insufficient reliability due to the limited service life of the arresters.

 Most of these drawbacks were eliminated in the installation for electric pulse destruction of materials [2] adopted as a prototype, in which a linear inductor transformer (LIT) is used as a high voltage source, which is a package of single-turn transformers-inductors, and whose primary windings are powered in parallel from a high-voltage modulator , and the secondary windings in series. The secondary conductor of the coaxial vacuum line is used as a secondary winding. The low-voltage end of the conductor is grounded, and the high-voltage end is passed through a cone-shaped bushing.

 Such an installation has fundamentally new possibilities with respect to the variation of the energy input mode due to the simple control of the voltage level at the pulse voltage generator (GIN) and due to the simple change in the pulse frequency.

 However, this installation has a voltage level limit determined by the insulation level of the coaxial line of the high voltage cable. The higher the voltage level at the GIN, the higher the steepness of the front of the pulse voltage at the GIN and the higher the selectivity of the disclosure of substances and the less their sludge formation. In addition, the installation does not use the capabilities of LIT. operate at a pulse repetition rate above 1 kilohertz. The latter is explained by the fact that the process of electropulse disintegration of complex substances such as rocks should not be accompanied by high sludge formation due to overgrinding, i.e., each act of destruction must end with the act of removing the destroyed material, and this requires a corresponding time between pulses, therefore, the frequency of the electropulse chambers for the purposes of selective disintegration of substances should be of the order of ten hertz.

 The purpose of the invention is to double the operating voltage of the GIN and a multiple increase in the volume of the processed substance with an increase in the frequency of LIT pulses.

 The goal is achieved by the fact that in the device for electropulse destruction of materials, consisting of LIT. the secondary winding of which is used a high-voltage cable, which is a high-voltage electrode, the low-voltage end of which is simultaneously grounded through a high-voltage capacitor and connected to the GIT via a controlled arrester, the control signal to which is supplied from the timer, and to increase the voltage from the GIN, a second high-voltage cable is passed through LIT. but grounded on the opposite side of the first cable. Therefore, at the high-voltage ends of two cables, bipolar pulses occur and the potential difference between them is 2 times higher than from one secondary LIT winding.

 In the manufacture of DIT. with a large inner diameter through LIT. many pairs of high-voltage cables can be skipped, this will ensure the alternate operation of the electric pulse chambers, the number of which is equal to the number of pairs of high-voltage cables. Alternate operation of the cameras is ensured by the use of controlled arresters, the number of which is equal to the number of secondary windings of LIT. The arresters are connected in parallel with the high-voltage inductors included on the ground side in all the secondary windings of the LIT.

 The arresters are controlled by a timer and a camera selection counter.

 As a result of a patent search, no technical solutions were found with the claimed combination of features, providing an increase in operating voltage and a multiple increase in the volume of the processed substance.

 The drawing shows an electrical diagram of the installation, where 1 GIN. type LIT. secondary windings 2, 3, 4, 5 of which are made in the form of a high-voltage cable, the high-voltage ends of which simultaneously serve as a high-voltage electrode.

 For windings 2 and 5, ends with a positive potential are grounded through high-voltage inductors 6, and for windings 4, 3, ends with a negative potential are grounded through inductors 6 and a high-voltage capacitor 9. A signal from timer 11 starts the arrester 8, connecting GIT 10 to the low-voltage ends of the windings 3 and 4. The signal from timer 11 simultaneously starts the counter for selecting cameras 12, the start signal from which falls on two controllable dischargers 6 of one of a pair of secondary windings 2 and 3 or 4 and 5. In this case, two discharges of shunt Two inductors 6 are made, thus performing the operation of one of the chambers 13. The chambers 13 are filled with technical fluid, are made with dielectric walls and with a metal grounded bottom.

 According to the level of energy input, the proposed installation can operate in two modes. The first weak mode when email. food is provided only from GIN-1. The second powerful mode when email. Power is supplied by GIN-1 and GIT-10. In this case, GIN and GIT are turned on in series.

 GIN-1 serves to initiate a discharge and form a channel of through conductivity in the thickness of the material being destroyed 14, and GIT-10 provides energy input into the formed breakdown channel and determines the scale of destruction. The high-voltage capacitor 9 included in the GIN-1 circuit works as a small capacitive resistance through which current flows from the GIN-1, but respects the current from the GIT-10, since by the time GIT-10 is turned on in the material to be destroyed, the GIN 1 pulse has already formed a low-resistance conductive channel for the GIT 10 breaking current.

 When signals are sent from timer 11 to the counter for selecting cameras 12 and HIN 1, a trigger pulse is sent from counter 12 to two dischargers 7 of windings 2, 3 (or 4 and 5). Through the earth 9, 7, 3, 14 and 2, a current begins to flow, determined by the voltage of the GIN 1, then from the timer 11 the start signal of the spark gap 8 is received, which is connected to the GIT 10 and along which the earth 10, 8, 7, 3, 14 and 2 starts a current flowing, determined by the voltage at the GIT 10, flows. This cycle ends. In the next cycle of the installation, the counter 12 includes the arresters 7 of a new pair of windings, in our case, windings 4 and 5.

 The positive effect is a significant increase in the level of a high-voltage pulse, an increase in energy in a pulse due to the connection of GIT in combination with an increase in the number of electric pulse chambers. As an example, we can point to the existing in Russia developments of permalloy cores nar 630 mm and vn 400 based on these cores, using a linear inductor transformer, it is possible to provide alternate operation of more than 20 electropulse chambers with a frequency of LIT operation. 200 Hz.

Claims (1)

 Device for electropulse destruction of materials, consisting of a linear inductor transformer (LIT), the secondary winding of which is a high-voltage cable, which is a high-voltage electrode, the low-voltage end of which is connected through a controllable spark gap to a pulse current generator and to earth through a high-voltage capacitor, characterized in that , in order to increase the pulse voltage and create an automatic switch of GIN and GIT to a large number of destruction objects, the secondary winding and LIT is made of two-turn, in the middle the inductance is grounded, and each half of the inductance is shorted by a controlled arrester, the number of secondary windings is several tens, and the windings were turned on from the timer device through the winding selection counter.