CS244991B1 - Power gas laser discharge device - Google Patents

Abstract

The solution relates to a power gas laser discharge device for producing a uniform stable discharge. It is an object of the invention that above the cathode (2) formed by at least one cylindrical segment disposed transversely. at least one surface anode (1) is disposed in the direction of gas flow, and an auxiliary segment electrode (3) is located upstream of the first cylindrical cathode segment (2) downstream of the gas flow. Each cathode segment (2) and each anode (1) has a coolant cavity formed. Electrically non-conductive pads (6) are provided between the individual anodes (1), forming an upper wind channel wall (17) with the anode wall (1). The upper diffuser plate (5) is placed on one side of the surface anode (1) so that the edge of the surface anode (1) extends over the diffuser thatch (5) and on the other side the upper confuser plate (8) forming the upper wall. aerodynamic channel (17). The segment electrode (3) is held in the holder (4) to which the lower diffuser plate (9) is clamped, forming a lower wall of the wind tunnel (17) together with the holder (4). Below the cathode (2) is a lower confuser plate (7).

Description

244991

BACKGROUND OF THE INVENTION The present invention relates to a discharge gas discharge device for generating a steady discharge.

So far known discharge devices utilize e-electrode systems to provide a steady, high current density discharge, which are located in the flowing gas in the region where the gas flow channel is narrowest and the gas velocity reaches the fastest speed. This is due to the fact that in these areas, due to the large gas flow resistance, the gas flow is proportionately lost. An aerodynamic channel is formed for the gas flow, which forms a gas flow so that the fastest cross-section of the channel where the electrode system is located and where the discharge between the electrodes of the electrode system is burned is achieved gas flow maximum value.

The flow of gas, in addition to providing a positive discharge of excess energy, ensures the formation of homogeneous conditions along the entire discharge. Typical flow velocities required for a sufficient discharge of excess heat energy from the system at the narrowest cross-sectional area of the channel are 30- 100 m / s at a working pressure of about 5.3 kPa. The need to achieve such a velocity is necessitated by the fact that almost all excess energy released in the cavity is discharged convectively - by flowing gas through the discharge. At these relatively high gas flow rates, the inhomogeneities of the flowing gas, such as the uneven velocity profile across the cross-section, result in differential local temperatures and hence uneven discharge conditions by the susceptibility to pass through the arc. The flowing gas thermal energy is discharged by a heat exchanger which presents a large gas flow resistance. These previously mentioned circumstances require the use of power units for gas drive depending on the desired flow rate. The large amount of heat energy is discharged by proportional demands on the heat exchanger, which is associated with the design and size of the exchanger, possibly with the use of several heat exchangers.

Large effective heat exchangers incorporated into the high-flow gas flow gas increase the demands on the gas drive unit. In the case of convective heat dissipation, heat transfers are used: discharge environment - gas flow, gas flow - heat exchanger, heat exchanger - cooling medium. Each transfer contributes to reducing overall cooling efficiency.

Creating homogeneous conditions in the entire volume of the discharge space is important in terms of discharge stability at high current density, with the aim of avoiding the transition of the arc discharge, thereby essentially limiting the amount of energy introduced into the combat area and also from the homogeneous point of view. of the optical environment, which serves as an active environment for generating laser radiation. This ultimately results in the overall efficiency of the laser device.

Laser devices known to date utilize spit forms of stabilization and homogeneity of the discharge. They utilize cathode segmentation into several individually resistively drawn segments, or also an anode segmentation, or both, cathodes and anodes. The use of a large number of segments of an electrode leads to an increase in stability, but is characterized by a complex construction, increased production natechnology, and materials associated with high temperature on the electrode surface, with a high working load on electrodes, with the need to preserve the tightness and cleanliness of the workspace with the need for high reliability and lifetime of the electrode system. In the other heat dissipation device, the segmented electrode uses indirect cooling, which, however, reduces cooling efficiency in this and other similar indirect cooling cases. To form a homogeneous condition, a gas turbulence is introduced into the discharge space, which is formed by separate turbulent baffles, grilles, strips, etc. These baffles are located near the discharge space in the narrowest cross-section of the channel. The use of separate turbulence generators located in the narrowest cross-section of the aerodynamic channel contributes to increasing the gas flow resistance and thereby poorly increasing the demand for gas aggregates resulting from the coverage of energy losses at these resistances.

The above-mentioned drawbacks are alleviated by the technical problem of the discharge device of the power gas laser, which is characterized by the fact that at least one surface anode is arranged above the cathode formed by at least one cylindrical segment, whereby the gas flow is upstream of the first cylindrical segment an auxiliary segmented electrode is placed on the cathode. Each cathode segment and each anode has a cavity formed by the cooling medium. Electrically non-conductive pads are formed between the individual yokes forming an upper stream channel upper anode with the anode wall. In the flattened anode, the diffuser plate is disposed on one side so that the edge of the flat anode extends over the diffuser end and on the other side the upper confuser plate forming the upper wall of the aerodynamic channel. The segmented electrode is attached to a holder to which a lower diffuser plate is formed, forming an aerodynamic 244991 bottom wall together with the holding bottom wall.

With tunnel. Below the cathode is a lower cone plate. It is within the scope of the invention that if triple anodes are located above the cathode, the length of the middle surface anode is equal to or greater than the length of the outer surface anodes. The electrically non-conductive substrates between the surface anodes are in one year with the lower surface of the surface anodes. The first cathode segment located behind the holder is its surface in the plane or sublevel of the plane formed by the surface of the holder and the lower diffuser plate and the other cathode segments are arranged behind. The shape of the auxiliary segment electrode is positioned so that the individual segments of the auxiliary segmented electrode are equally extended upstream of the discharge space and the level of the plane formed by the surface of the robot and the lower diffuser plate. The advantage of the discharge device of the power gas laser according to the invention is that it is characterized by a simple, reliable and economical construction, does not require the use of special materials, which is a prerequisite for long service life and reliability of the device in achieving high performance. the demands for convective heat dissipation from the discharge enable the use, as an aggregate for the drive, of gas-driven fans used in air-conditioning. The discharge devices according to the invention, as part of the flow gas discharge laser, contribute to increasing the overall efficiency of the laser device. FIG. 1 is a cross-sectional view of the discharge device of the output gas laser; FIG. 2 shows the deposition of the electrode in the axon-meiria; FIG. and Fig. 3 is a cross-sectional view of the perpendicular axis of the electrodes. The power laser discharge device consists of a gas drive unit 1 located within the working space bounded by the device housing 18. In the working space of the device there is a cathode 2 formed by three cylindrical segments inserted across the gas flow direction. Above the cathode 2 there are three flat anodes 1. An auxiliary segmented electrode 3 is located downstream of the first cylindrical segment 2 of the cathode 2. Each cathode segment 2 and each anode 1 has a cavity for cooling medium. Between the individual anodes 1, electrically non-conductive pads 6 are provided, forming an upper wind channel stent with the anode wall 1. A top diffuser plate 5 is disposed on one side adjacent the flat anode 1 such that the edge of the flat anode 1 extends over the diffuser plate 3 and, on the other hand, the upper confuser plate 8 forming the upper wall of the aerodynamic channel. The segmented electrode 3 is fixed in the holder 4 to which the lower diffuser plate 9 is formed, which together with the holder 4 forms a lower wall aerodynamic tunnel. Below the Icathode 2 is a lower confuser plate 7. In the case where triple anodes 1 are located above cathode 2, the median area anode 1 is equal to or larger than the longitudinal anodes 1. The first segment of the reservoir 2 located behind the holder 4 is its surface in the plane, or below the level of the plane formed by the surface of the holder 4 and the lower diffuser plate 9, and the other segments of the cathode 2 are arranged one behind the other. After the first segment of cathode 2, the shaped ends of the auxiliary segment electrode 3 are disposed such that the individual segments of the auxiliary segmented electrode 3 are evenly displaced in front of the discharge space 10 above the level of the surface retainer 4 and the lower diffuser plate 9. Function of the discharge gas power laser device is as follows: In the discharge device, the gas flows in a closed loop. The gas flows from the propellant aggregate 13, through the diffuser region 19, the narrowest cross-section of the aerodynamic channel 17, then flows through the discharge space 10a through a confusion space 20. Behind the confusion space 20 there is a gas flow directed towards the heat exchanger 16 which is located across the direction gas flow.Homogenic stable main discharge of mountains? in the charge space 10 between the segment 2 of the cathode 2 and the surface of the main discharge, the discharge is maintained between the first soda of the cathode 2 and the segments of the auxiliary segment electrode. 3. The flow rate extends to the maximum velocity in the outermost cross section of the aerodynamic channel 17. The gas flow is affected by the pre-discharge space 10 in the mutual arrangement of the upper diffuser wall 5, the lower diffuser wall 9, the auxiliary segmented electrode 3 holder 4 and the surface anodes 1 s izolačnýchivložkami B.

Each segment of the auxiliary segmented electrode 3 is connected to the power supply circuit via individually load resistances 11 of the auxiliary electrode 3, which typically have the same value. The surface anodes 1 are loaded with individual load resistors 12 through which the surface anodes 1 are connected to the power supply circuit. The cathode segments 2 are connected to the power supply circuit via load resistors 13, 14. The values of the anode resistors 12 may be different, and may affect the effect of the uneven gas flow profile on the discharge flame, which is mainly manifested under extremes of surface 1. By the ratio of the load cathode resistors 13, 14 and the load anode resistors 12, the electric current density between the

Claims (3)

The values of the load resistors 12, 13, 14 depend on the particular conditions. The homogeneous and stable volumetric discharge of the ovy current density produced by the device of the invention is suitable as an active environment for generating powerful laser radiation. A typical use is for lasers utilizing carbon dioxide molecules as the active medium, the exhaust gas being a mixture of carbon dioxide, nitrogen, and helium in a selected proportion of the individual components. The device according to the invention allows the use of a multi-pass type of optical resonator and thus a fuller utilization of the active area generated by the discharge. A portion of the auxiliary stabilizing discharge apparatus has a versatile use. It may be used in similar discharge systems that use a so-called two-discharge arrangement where the auxiliary discharge produces conditions for stably burning the main discharge. This part of the device was used in a 1000W power output laser. 1. A power gas laser discharge device, comprising an aerodynamic channel, a gas drive unit, a heat exchanger, a cathode, an anode, and an auxiliary segmented electrode, disposed above the cathode (2) formed by at least one cylindrical segment at least one planar anode (1) is disposed transversely to the gas flow direction, wherein an ancillary segmented electrode (3) is disposed upstream of the first cylindrical cathode segment (2), while each cathode segment (2) and each yes - (1) a cavity for the cooling medium is formed and electrically non-conductive pads (6) are disposed between the individual anodes (1) forming an upper stream channel (17) with the anode wall (1), adjacent to the surface anode (1) the upper diffuser plate (5) is mounted on one side so that the edge of the surface anode (1) extends beyond the diffuser plate (5) and from the other side the upper confuser plate (8); the upper wall of the aerodynamic channel (17), while the segmented electrode (3) is held in the holder (4) to which the lower diffuser plate (9) is located, adjacent to the lower bracket (4). an aerodynamic channel wall (17), while a lower viewer plate (7) is placed under the cathode (2). 2. A power gas laser discharge device according to claim 1, wherein three surface anodes (1) are disposed above the cathode (2), wherein the median surface anode (1) is equal to or larger than the outermost anode surface. anodes (1). 3. A power gas laser discharge device according to claim 1, wherein the first cathode segment (2) located downstream of the holder (4) is at or below the surface of the holder surface (4) and the lower diffuser. the plate (9) and the other cathode segments (2) are arranged one behind the other, wherein the first cathode segment (2) is provided with shaped ends of the auxiliary segment electrode. (3) such that the individual segments of the auxiliary segmented electrode (3) are equally extended before the discharge chamber (10) above the plane of the surface of the holder (4) and the lower diffuser plate (9). 2 sheets of drawings