SU98005A1 - Device for analyzing the operation and calculation of complex ventilation networks - Google Patents

Description

The movement of air in ventilation networks, in particular in mine workings, is under the law:

where the h-depressions are at the ends of the set ;; in mm of water v .;

R- network resistance; Q - air flow through

iTH

Root and e-ply mains; i networks

models. The basis

iodine models dependency

U - / iJ-,

where U is a female generator (z volts) at the ends of the element is electric; -: ceii corresponding to a section of the simulated pipeline,

K-factor (in volts ampere-);

J-power jOKB (in amier).

To implement these models, the electrical circuit, receiving power from a current source reproducing a pressure head, is introduced as the resistance of an incandescent lamp with a parabolic current-voltage characteristic, reproducing and corresponding sections of the pipeline.

However, these well-known fjpinseHHMf ycTpoii, only for modeling and calculating ceTeii with sources with a constant pressure.

The proposed device can be used to simulate complex air lines with many production systems that are included, with 1 axial and centrifugal fans, and they are one or two, they have sources with flow dependent pressure.

For this purpose, regulating resistors and lamines of incandescence are connected in series with sources of direct current.

FIG. 1 and an example ventilation circuit for example; FIG. 2 is an electrical circuit corresponding to it and simulating it.

Ma FIG. 1, Ri, R.2, Rn denotes the resistances of individual sections of the pipeline of the ventilation network, and 5i, S2.i., And axial J centrifugal fans.

FIG. 2 letters K, 1 (", K. Are the electrical resistances of an incandescent lamp with a parabolic volt-ampere characteristic, through u, b ;, ,, S:; - current sources.

The comparison of FIG. 1 and 2, and shows that an electrical circuit simulating it can be assembled for any ventilation circuit. The possibility of drawing up an electrical circuit with co-motions in branches, which have values of the coefficient to the dependence of the flowing current on the applied voltage, which considerably differ from each other, is provided, on the one hand, by selections, having different coefficients k, and, on the other hand, or their sequential inclusion.

To simulate, for example, the resistances R5, Ri3 RubR2o of the ventilation network (Fig. 1), two series-connected lamps were used, -o (Fig. 2). Multiple filament lamps are also used, which make it possible to obtain the same coefficient (by the client) by appropriate switching of the voltage (the patient to the relationship between the voltage applied to the lamp and the current flowing through the lamp).

In terms of currents and voltages at certain places in the circuit, they calculate air flow rates and depressions at certain places in the ventilation circuit.

The current sources B, B, Bz, which model the fans B, B., Bg, are either batteries or transformers with selenium or cuprox rectifiers. To change the angle of tilt, the characteristics are rheostats connected in series with batteries or with rectifiers. To simulate centrifugal fans, a lamp with a parabolic volt-ampere characteristic is sequentially connected to the power supply circuit.

A battery (or a transformer with a rectifier) with a series-on incandescent lamp is a current source with a parabolic characteristic modeled by a centrifugal fan that generates a head, the magnitude of which depends on the flow rate.

The depressions developed by the fan and the air flow are determined by the voltmeter and ammeter readings, which are recalculated according to the equations:

h:: mh U; R is mR-k; -J,

where mh, mR, mQ are the corresponding scale factors.

FIG. 3 is shown in the context of one of the possible variants of the structural design of the panel of the device proposed.

On the panel 7 of insulating material are placed the cartridges 2, into which the incandescent lamps 3 are screwed. The glass of the cartridge 2 is connected to the contact plate 4, and its central pin is connected to the plate 5. The contact plates and 5 and the opening 6 in the panel form a socket for inclusion in the circuit measuring instruments.

To include a voltmeter in the circuit, there is a plug consisting of a copper rod 7 connected by a flexible wire to a voltmeter clamp, and a housing 8 made of 13 insulating material.

To turn on the ammeter, there is a plug, in the case of which 8 there is a fixed rod consisting of two contact plates 9. These plates are insulated from each other by an insulating gasket 10 and connected to the terminals of the ammeter. Such a device of sockets and plugs allows the electrical circuit to be broken at the right place and to include an ampere meter in the gap, as well as to include a voltmeter between any points of the circuit.

Subject invention

A device for analyzing the operation and calculating complex ventilation networks, which is an electrical model of the network, containing a current source reproducing the pressure, and series and in parallel incandescent incandescent lamps with a parabolic volt-ampere characteristic, reproducing the corresponding sections of the pipeline, characterized in that the purpose of simulating ccTeii with many arbitrary axial and centrifugal ventilators, which are flow-dependent sources, with no conductive reproducing their sources d.c. included adjusting rheostats and incandescent lamps.

FIG. 1 ..Wr

17 GTT - / TG / 7

Kg Kz K4

FIG. 2

K31