SU915014A1 - Device for forming electrolyte gap in mercury coulometer - Google Patents

Description

The invention relates to electrical engineering and is intended for use in the production of mercury spray meters of various types of large-scale parties.

A device is known for mechanically introducing a metered amount of electrolyte into a mercury column, containing contact electrodes fixed at both ends of a 'capillary tube filled with mercury and located at an angle of 1040 °, as well as a vibrator, kinematically' associated with the tube. The formation of an electrolyte gap is carried out from the residual capillary film of electrolyte, which is introduced into the tube filled with mercury (P.

The disadvantages of the known device are low accuracy to ensure a given length of the gap and the considerable complexity of the settings.

In addition, in the practical application of the known device has

2

the formation of air bubbles in the electrolyte gap.

The closest technical solution to the invention is a device for forming an electrolyte gap; in a mercury cooler, containing a DC source, connected to an electrical circuit is a mercury cooler column - electrolyte layer - a mercury bath layer and connected to a reference length unit via a control input. The length of the electrolyte gap is regulated by the amount of electricity flowing through the said electrical circuit 12].

A disadvantage of the known device is also determined by the low accuracy of the formation of the electrolyte gap, in particular its length.

The variation in length occurs when

detachment filled with mercury.capillary

from a layer of mercury plating bath

due to non-uniformity over 3 · 91

bone tension of mercury in the area of separation, the presence of chips and protrusions at the end of the capillary, varying degrees of wettability of its inner surface, etc.

The aim of the invention is to improve the accuracy of the formation of an electrolyte gap in a mercury column of a similar electrical measuring instrument.

This goal is achieved in that a device for forming an electrolyte gap in a mercury meter that contains a constant current source connected to an electrical circuit is a mercury cooler meter column - an electrolyte layer - a mercury bath layer, a block of reference values for the length of the gap, an alternating current source stabilized , a split capacitor, a resistance measurement unit, a comparison unit, and a block of reference gap length values are made resistive, with the AC source Connected parallel to a DC source, the [Non-grounded ^ terminal of two current sources is connected to the corresponding input terminal of the resistance measurement unit through a coupling capacitor, one of the inputs of the comparator is connected to the output of the resistance measurement unit, the other input is to the output of the reference gap length unit and the output is to the control input of the DC source.

Figure 1 shows the functional diagram of the device; figure 2 - phase of the formation of the gap.

The structure of the device (figure 1) includes sources 1 and 2 of constant and alternating currents, connected in parallel to an electric circuit 3 column of mercury of a kilometer - electrolyte layer - layer of mercury galvanic bath; separation capacitor 4, resistance measurement unit 5, resistive unit 6 reference gap length values (resistance setter), comparison unit 7. Electrical circuit 3 has power electrodes 8 and 9. ₍

Figure 2 shows the glass capillary 10 of the mercury coolometer billet, the mercury column 11, the down-conductor 12, fixed with the help of a ger ⁴ 4

label, electrolyte layer 13, mercury layer 14 at the bottom of the electroplating bath, electrolyte formed Zgzor 15.

The process of forming an electrolyte gap is based on the electrochemical dissolution of the mercury column and is carried out as follows.

After the separation of the filled capillary 10 from the mercury layer 14, the length of the mercury column 11 may be different due to a number of factors noted above (FIG. 2a, B).

Accordingly, the resistance between the electrodes 8 and 9, which is the current value of the resistance of the electric circuit of 3 pillar of mercury in the electrolyte layer - the layer of mercury in the plating bath, is actually different, and actually reflects the length of the electrolyte gap. AC voltage drop, proportional to this resistance, through the separation capacitor 4 is supplied to the input of the resistance measurement unit 5. The output signal of block 5, proportional to the resistance of the circuit 3, in the form of a DC voltage is applied to one of the inputs of block 7 comparison. To another input of block 7, the output voltage of block 6 of reference values of the length of the gap, is proportional to: the reference resistance of circuit 3.

With the known electrical conductivity of the electrolyte, the radius of the capillary 10 and the electroplating bath design, the reference resistance of circuit 3 representing a given gap length (is deterministic. For ease of device restructuring, when forming perimeter gaps, various types of block 6 of the reference gap length can be implemented of the resistor box included in the load of the current stabilizer, while the device is supplied with calibration tables with reference resistance values as a function of rad capillary tube and the required electrolyte gap length.

The output voltage of the unit 7 of the comparison IIp, which characterizes the difference between the set and the formed values of the length of the gap, is fed to the control input of the source of direct current 1. As a result, a direct current passes through electric circuit 3, the value of which is proportional to

5 9150

module όρ. The direction of the current depends on the sign 1) p. If the reference resistance is greater than the resistance of the circuit 3 (1) p is positive), then the electrode 8 is polarized positively. In 5 of this case, the mercury column 11 dissolves and the resistance of the gap formed and, consequently, of the entire circuit 3, increases, which leads to a decrease in the difference between the two constricted resistances. With a negative polarity, 0p positively polarizes electrode 9, which also causes a decrease in the indicated difference of resistance, 5

and reduction of the direct current passing through the formed gap. When the resistance of circuit 3 is equal to the reference resistance (FIG. 2), the module is 0p. equal to zero 20

and the passage of direct current through the formed gap stops.

After that, the billet of the culometer with the formed gap is lowered into the mercury layer 14 (Fig. 2 g, 3) at a depth of 4 - 10 mm and the formed gap is “swept”. To do this, a direct current is passed through the formed gap with positive polarization electrode 8. 30

The current amplitude "sweep" is selected so as to ensure rapid movement of the electrolyte gap formed to the desired length of the capillary depth (fig.2E) ₃₅ without disturbance of the electrochemical mercury transport process. In this process, the formation of an electrolyte gap ends.

Formation of the gap by the value of its resistance, and not by the amount of electricity passing through 14 6

Dawn, allows to significantly reduce the variation in length in the production of mercury spray meters in large quantities

Claims (1)

Claim A device for forming an electrolyte gap in a mercury cooler, containing a constant current source connected to an electrical circuit; a mercury column of a cooler meter — an electrolyte layer — a mercury bath layer, a block of reference gap length values, characterized in that a source stabilized by the amplitude of the alternating current, a separation capacitor, a resistance measurement unit, a comparison unit, and a block of reference gap length values are made resistive, and the AC source is connected parallel to the DC source, the common non-grounded terminal of the two current sources is connected to the corresponding input terminal of the resistance measurement unit through a coupling capacitor, one of the inputs of the comparison unit is connected to the output of the resistance measurement unit, another input to the output of the reference gap length and the output is to the control input of the DC source.