Method of fan operation control

FIELD: process engineering.

SUBSTANCE: proposed method comprises controlled air inflow. Note here that said controlled air inflow occurs between first and second stages of the fan.

EFFECT: lower power consumption.

1 dwg


The invention relates to ventilation units with two-stage axial fan and can find application, in particular, on the main and auxiliary fan installations, mines, mines, and other objects ventilation.

The known method of regulating the mode of operation of the mine ventilation units with two-stage axial fans to intake, artificial creation of suction air and the discharge - increased leakage. This increases the amount of air passing through the fan, and at the same time decreases its receipt in the mine (see, for example, [1], p.72, [2], p.66, 93-94). This method of control is used when the use of other known methods for any reason it is impossible or impractical.

The method allows for rapid change of the ventilation mode, but its use is associated with loss of energy, which can approximately be determined by the following formula:

where QP- an amount of drawn air, m3/s;

H0the pressure created by the installation, PA; N0=N1+H2;

H1the pressure developed in the first step;

H2the pressure developed in the second stage;

η is the efficiency of the installation.

The objective of the invention is iunie energy costs in the regulation of the ventilation unit artificial creation of air leaks.

To solve this problem on two fan units with axial fans operating on the suction side, perform the suction air flow between the first and second steps of the installation.

The essence of the proposal is illustrated in the drawing, which schematically shows a fan that implements the proposed method of regulation.

The installation includes two pressure stages 1 and 2, the supply line 3 and the drain to gate 4 for air leaks after the first stage. The first step of the installation can be either the first impeller two-stage fan unit, or the first axial fan, if the unit consists of two serially connected axial fans. The dashed line shows the drainage gate 5 when implementing the method of regulating managed unmetered air entering the first stage, as implemented in the current prototype.

Energy losses on regulationusing the proposed method can approximately be determined by the following formula:

where QP- the amount of air drawn in after the first stage, m3/s;

η1, η2accordingly the efficiency of the first and second stage.

If we take as a first approximation that η 1=η2=η, taking into account (1) and (2), reduction of energy loss in regulation in the second case (when sucking air into the second stage) can be defined by the formula:

As follows from the last formula, the energy loss in regulation using the proposed method is lower in comparison with the known method of control.


1. Borisenko HP, Borodinski A.G. and other Mining mechanics: a Textbook for high schools. - M.: Gosgortekhnadzor, 1962. - P.72.

2. Geyer VG, Tymoshenko G.M. Mine ventilation and dewatering installation: Textbook for universities. - M.: Nedra, 1987. - P.66, 93-94.

The method of regulating the operation mode of the two-stage ventilation unit with axial fan operating on a suction operated air leaks, characterized in that the conduct of air leaks between the first and second steps of the installation.


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