SU662807A1 - Method and apparatus for automatic metering and mixing of gases - Google Patents

Description

one

The invention relates to the field of dosing and gas mixture preparation techniques. ,,

Methods are known for dosing the components of a gas mixture in a stream. For the implementation of these methods, devices are used, containing a numerical pressure source, a container with a dosing material, intake and switching systems 1, 2 |. 3

A known method consisting in the separate supply of components in a continuous stream, the formation of volumetric doses of each component with the next cut-off of streams and mixing 4.

The disadvantages of this method include discontinuous operation and reduced accuracy due to the influence of the physical state of one component on another.

Closest to the invention by technical essence is a device for metering and mixing, implementing method 4 and containing a reservoir with a movable bell placed in it, divided into chambers with nozzles, a drive and a collector with a piping system.

To improve the dosing accuracy by eliminating the mutual influence of the physical state of the mixing of the mixing components of the proposed method, the flow rates of each component and mixture are stabilized at the moment of cutting off the volume doses. In addition, for metering accuracy,

ensure continuity and increase productivity, the proposed device is equipped with an additional bell, a reversing actuator switch and a valve switch, while the bells are mechanically connected to each other by

a common drive, a valve switch is mechanically connected to a reversing drive switch, which is electrically connected to an additional pressure sensor installed at the outlet, and the manifold is configured

with porous partitions.

The drawing shows the principle scheme of the device described, which includes a reservoir 1 with bells 2, 3 divided into chambers 2.1: 2.2 and 3.1; 3.2. Bells 2 3 are mechanically connected between

a pair of chain - an asterisk 4, 5. The asterisk 5 is mechanically connected with the shaft of the electric drive 6. On the same axis as the asterisk 5 there is a reversing switch 7 of the electric drive 6, kinematically connected

with chain 4 through travel stops

4.1 and 4.2 located on the circuit 4. The reversing switch 7 is mechanically connected with the valve switch 8, which is located on the same axis with the reversing switch 7 and switches the gas lines of the device. At the inlet of the carrier gas line (in this case air), a collector-mixer 9 is installed with porous partitions 9.1 inside, made, for example, of porous ceramics, and at the device exit an optimum pressure sensor 10 controlling the electric actuator 6.

Valve switch 8 with gas ducts 8.1, 8.2, 8.3, 8.4, 8.5, 8.6, 8.7, 8.8, 8.9, 8.10 and 8.11 commute the gas pipelines in the following order: I - metering gas along the line:

at the suction of the bell: gas source - valve switch - measuring chamber of gas;

in the case of an outwardly moving bell: measuring chamber - valve switch - manifold-mixer - measuring chamber of a gas mixture.

D - dosed gas carrier by line m:

at the suction of the bell: collector - mixer) - valve switch-mer chamber of the gas mixture;

in the case of an outwardly moving bell: a gas chamber measuring chamber — a valve switchboard — an outlet branch pipe.

Ducts 8.2, 8.5, 8.8, 8.11 of the valve switch 8 are constantly open.

The optimum pressure sensor 10, made, for example, in the form of a bellows with electrical contacts, controls the power supply circuit of the electric drive 6.

Cameras 2.2, 3.2 bells 2-, 3 are removable. The proposed device works as follows.

When moving, for example, the bell 2, the gas from the chamber 2.2 is displaced downwards, and the gas from the chamber 2.1 is displaced from the chamber 2.1. The bell 3 at this moment rises up and the gas mixture is sucked into the chamber 3.1, and the gas — into the chamber 3.2.

The ducts 8.1, 8.6, 8.7, 8.12 of the valve switch 8 are open at this moment, and the ducts 8.3, 8.4, 8.9, 8.10 are closed.

The volume of gas withdrawn from the chamber

2.2 in direction of measure 3.1 through the pipeline through the ducts 8.6, 8.5 of the valve switch 8. In the manifold-mixer, it is picked up by air flow, mixes, the passage through the porous partitions 9.1, then through the ducts 8.8, 8.7 of the valve switch 8, opened in this moment.

Ceramic porous partitions 9.1 collector-mixer 9 contribute to the rapid formation of a homogeneous gas mixture. si even at low flow rates of displaced gases. Porous partitions also provide explosion safety when displacing explosive components.

662807

The withdrawn gas mixture from chamber 2.1 of bell 2 rushes through the pipeline through open conduits 8.1 and 8.2 of the valve switch 8 to the outlet of the pipe 2.

As the bell 3 rises up at this moment, the chamber 3.1 is filled with a gas mixture from the mixer 9, into which the dosed volume of gas from the chamber 2.2 of the bell 2 is directed.

The path of the components is described above. Equalizing the pressures of gas and gas carrier before dosing the gas mixture eliminates the effect of fluctuations in atmospheric pressure on the accuracy of dosing.

Simultaneously with the filling of the chamber 3.1, the chamber 3.2 is filled. Gas flows from the gas source through the pipeline through the open ducts 8.11 and 8.12 of the valve switch 8. Bell 2 continues to move until limit stop 4.1, mounted on chain 4, switches the reversing switch 7.

At the same time, the valve switch 8 is switched, as it is mechanically connected to the reversing switch 7.

At this moment, the ducts 8.1, 8.6, 8.7, 8.12 of the valve switch 8 are closed, and the ducts 8.3, 8.4, 8.9, 8.10 are opened. The electric drive begins to rotate in the other direction, the bell 2 will start to rise, the bell 3 to go down.

Chamber 2.2 will begin to fill with gas from the gas source through the gas pipeline through the ducts 8.11, 8.10 of the valve switch 8, chamber 2.1 will begin to fill with the gas mixture from the header of the mixer 9 through the gas pipeline through the ducts 8.8, 8.9 of the valve switch 8. The lowering bell 3 will push out of the chamber 3.1 gas mixture through the pipeline through the ducts 8.3, 8.2 of the valve switch 8 to the outlet, and the dispensed volume of gas in the chamber 3.2 through the pipeline through the ducts 8.4, 8.5 of the valve switch 8 to the collector-mixer 9. the collector-air mixer 9 picks otdozirovanny gas mixed with it, pass through the porous partition walls and through flues 9.1 8.8 8.9 The switch valve 8 opened at this moment, it is directed into the chamber 2.1 bell 2 podymayuschegos up at this point.

If the normal state of the gas consumer is disturbed and the pressure starts to change in the outlet of the metering device; The optimum pressure sensor 10 is activated and opens the power supply circuit of the electric drive 6. When the consumer returns to normal, the optimum pressure sensor restores the electric supply circuit of the electric drive 6.