SU1535257A1 - Flat grid for electronic and gas-discharge tubes - Google Patents

Description

(46) 07.30.92.Bksh. Number 28

(21) 4248393/21

(22) 05.25.88

(72) V.L. Krestov, V.B. Merkulov and G.N. Khobotova

(53) 621.3.032.24 (088.8)

(56) USSR author's certificate No. 133J31, cl. K 01 J 1/46, 1960.

USSR Author's Certificate In 256091, cl / II 01 J 19/38, 1967.

(54) FLAT GRID FOR GAS-DISCHARGE AND ELECTRIC-ACCESSORIES

(57) The invention relates to electronic engineering, and in particular to gas discharge and tlectrovacuum devices. The purpose of the invention is to increase the effect of controlling the flow of charged particles by increasing the uniformity of flow in a plane parallel to the anode. The flat grid consists of a cellular grid cloth, each cell of which is made in the form of a rectangle and bounded by jumpers, while the corresponding sides of neighboring rectangles are perpendicular and additional jumpers are inserted into the cadmium cell so that they form additional cells similar to the grid cells. The ratio of the width of the additional lintel and the long side of the additional well to the width of the lintel and the long side of the well is chosen from 1: 7 to 1:18. The technical advantage of the solution is to improve the control properties of the mesh, greater durability due to increased resistance to spraying. 3 il.

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The invention relates to electronic equipment, in particular, to flat grids of ln gas discharge and electrovacuum devices, for example, intron.

The aim of the invention is to increase the efficiency of controlling the flow of charged particles by increasing the homogeneity of the structure of the grid D of a plane parallel to the anode.

FIG. 1 shows a grid, a general view; in fig. 2 shows the dependence of the maximum switched power on the size of the hole of the grid sheet in FIG. 3 - dependence of the ratio of the switched power Rtson to the maximum power for different geometric designs of a grid grid CTpyKTvtjjJ,

The flat mesh consists of a cellular net cloth, the Kalda cell of which is made in the form of a rectangle with an aspect ratio of 2: 1 and bounded by the symbol 1, while the sides of the neighboring rectangles are interdisciplinary, additional bridges 2 are inserted into each cell so that they form additional cells are subject to. grid cells The ratio of the width of the additional lintel 2 and the long side of the additional cell to the width of lintel 1 and the long side of the cell is selected from 1: 7 to 1:18.

As can be seen from FIG. 2, when reducing the size of the holes in the grid less than 0.25 mm

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ruomep power nt due to increased power losses on the grid.

An increase in the orifice greater than 0.5 mm (up to 1.3 mm) does not cause a sharp de-coupling of the switched power, but this requires a decrease in the operating pressure of the filling gas in the device, which leads to a significant increase in the voltage generated and the discharge and, consequently, an increase in power losses in the device and a decrease in its efficiency. On the basis of these experimental data, it was concluded that the allowable dimensions of the smaller side of the additional cell are (0.25-0.5) mm, and the larger side is (0.5- 1) mm.

In order to obtain greater homogeneity of the grid, it is necessary to have the minimum possible width of the jumpers of the additional cells, and from the condition of the power output allocated on the grid, the maximum. An increase in the width of the jumpers, in addition to disturbing the homogeneity of the structure, leads to an increase in the share of switched power intercepted by the grid. Therefore, it is necessary to fulfill one more condition: the optical transparency of the grid D must be at least 0.6, i.e.

D- bib- 0,6, b grids

where SOT% is the total area of the mesh holes; SC "TIUJ - the total area of the grid.

Of the conditions for ensuring structural rigidity, the minimum width of the jumpers of the additional cells should be not less than 0.05 mm, and the maximum ensuring the transparency of the grid should be not less than 0.6 mm, with the above-mentioned sizes of the additional cells retaining sufficient uniformity - 0, 1 mm.

The boundary condition for calculating the dimensions of the main cells is

the operating temperature of any grid point, which must not exceed the critical temperature, i.e. the temperature at which the thermal emission of the grid material appears.

When the corresponding ratios of the sizes of the additional cells to the sizes of the main cells are less than 1: 7 (1: 6, etc.), the phenomenon of the anode field sags into the cathode region of the device and the grid loses

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sheaf managers goypstl. If the ratio of the sizes of the additional cells to the sizes of the main cells is greater than 1:18 (1:19, etc.), the grid transparency decreases so much that it makes it difficult for the device to develop the discharge on the device and intercepts it. grid a significant proportion of the switched current, which leads to an increase in power losses on the grid. An excessive increase in power losses on the grid leads to its overheating and destruction.

As can be seen ne fig. 3, a positive effect is obtained when using grids No. 1, 2, A, whose aspect ratio is in the range from 1: 7 to 1H8. When these ratios are exceeded (1: 6 for grid No. 5 and 1:20 for grid No. 3), the switching power is less than 50% of the maximum, which cannot be considered satisfactory.

The proposed design allows the fabrication of a monolithic mesh of refractory material (for example, molybdenum), which provides improved heat dissipation, parapet stability and increased service life of the instruments due to a significant reduction in the sputtering of the mesh material at the moment of interruption of the anode current in the instrument.

An example. Tacitron prototype, which uses the proposed grid with the dimensions of the main cells 5 x 11 mm with 1 mm bridges and additional 0.35 x x 0.8 mm cells with 0.1 mm bridges when operating in pulse-packet mode, switches the average power in the package 1000 kW.

The grid has more efficient control properties, withstands increased thermal loads, is more resistant to spraying under the action of ion bombardment, which leads to an increase in the service life of the grid itself and the entire instrument as a whole.

Claims (1)

Claims of the invention A flat grid for gas-discharge and electrovacuum devices consisting of a cellular grid cloth, each cell of which is made in the form of a rectangle and bounded by bridges, with the corresponding sides of the adjacent rectangles being perpendicular, and in each cell Additionally, at least one additional jumper is installed, the width of which does not prevent the width of the jumper, and is located on the parallel side of the long side of the cell, so that, in order to increase the efficiency of control of the flow of charged particles by increasing the flow uniformity in About 0.2 0L 0,6 0,8 1,0 1,1 Size of the finger, mn FIG. 2 Y S / 6 Mogokosgi parallel to the anode, in addition to the cell, are provided with additional jumpers so that they form additional cells, similar to junction cells, with the ratio of the width of the additional jumper and the long side of the additional cell to the width of the jumper and the long side of the cell 7 to It 18. five 1 Qu, u