SU563575A1 - Pneumatic levelmeter - Google Patents

Description

This invention relates to a level signaling device for bulk materials.

Known level indicators for bulk materials are known, which contain pneumocylins.r, connected by a rod of double pistons with a gear rack connected to a gear wheel, on a rigid shaft, which is rotated by 180 ° during a piston stroke, a spool device on the SSEPA elements controlling the piston stroke and a discrete memory cell at the output 1.

There are moving parts in such alarms, besides, it is necessary to seal the pinion shaft from the cylinder cavity. This reduces the reliability of the detector.

The closest in technical essence to the invention is a pneumatic level gauge containing a flow-through sensitive element connected to a square pulse generator consisting of a three-membrane relay, throttles and capacitance, normally open pneumatic valve and indicating device 2. However, such a level gauge has a high consumption air flow.

A discrete memory cell and an additional choke are inserted in the proposed level gauge, the output of the sensing element is connected to a discrete memory cell through a repeater, the output of which is connected to the indicating device and control chamber of a normally open pneumatic valve, and an additional choke is parallel to a normally open pneumatic flange.

This reduces the consumption of air consumed.

FIG. 1 shows the flowmeter diagram; in fig. 2 - the cyclogram of his work.

The level gauge of bulk materials in the hopper 1 consists of a sensitive jet element 2, which consists of two coaxial nozzles, one of which is powered by generator 3, and the other senses the pressure of the jet

This is powered by a variable choke 4 and is connected to the input of a repeater 5 with a shift, the output PI of which is connected to the input of a discrete memory cell 6. The output of the cell is connected in parallel with the secondary device to the input of the generator 7 inertia unit, which is a parallel-connected normally open pneumatic valve and an additional variable choke connected between the main variable choke (indicated by a dotted line) and the capacity of the generator 3.

The gauge works as follows. At the normal level, generator 3 emits pulses at a certain frequency with which the pressure value ia Pd increases or decreases. (Fig. 2). It repeats in the repeater 5 with a shift and enters the input of the cell 6. The myceration of the cell is adjusted so that at the indicated frequency at its output a signal is received:;, equal to zero.

In momeit backfilling nozzles eleme gga 2 pressure./,. decreases, at the output of the repeater 5, the pressure PI also decreases and remains for a long time, which is fixed by a single output1) 1.1 by the signal РВ, X of cell 6, which closes the normal opening of the node 7 n and connects the remainder of the choke and pnernionny link generator 3. As a result, the frequency of single pulses P, - generator 3 is reduced.

With the release of the sonl of element 2, the signal P ,. it closes the air stream, acting as a non-valve, the pressure increases, the signal of the PI element 5 also increases, on B1 at the entrance of cell 6 but is zero SigiiJi. which opens the clan of the node 7 shunts the extra-decisive and ideal choke of the node 7, excluding it from the circuits and increasing the frequency of the generator 3.

Claims (2)

1. С Bulk material analyzer and non-mathematical SUSM-P. Technical oipsa n instructions for operation of the Kuibyshev branch of SKB-ANN, 1974. 2. USSR author's certificate L 428223. cl. G 01F 23/16, 1972.  II -TLrLTLn LG1Sh1 PPPP | PPPPPPP Shh til r m If