SU108024A1 - Pneumatic tubes for measuring the total and speed pressure in the suction piping - Google Patents

Description

The prior art of the invention are pneumometric tubes for measuring the total and velocity of pressure in the suction pipe, pipe 1, their normal air flow.

Known pneumo grime ts 13bki can not pa6ojaib in dusty air for a long time, since the canals of the tubes are clogged.

The use of the proposed pneumometric tubes also prevents the} clogging of them with dusts at length. For example.

This is achieved by the fact that each measuring tube, one end of which is attached to the measuring device, has a closed secondary end, connected by a small hole connected to the perimeter tube at the additional small diameter tube open at both ends and intended for suction into the air duct from the atmosphere.

FIG. 1 shows a schematic view of pneumatic tubes; in fig. 2 section of the closed end of the tubes.

Pneumatic ubc soda) measure in itself. Measured tubes 7, to each 1. From the sarropbix and to the neurimeter of Nrina to the co-party with the atmosphere (1) oG | tube 2.

Each tube / tube 1 is connected to a micromanometer with its open end .1 and the closed end through opening 4 communicates with the end (/ gk) of the test tube 2. Measure 2 tubes with one end, hole 1 1 /, and communicate with the end with the atmosphere.

Pneumatic tubes installed; pinch O1C for continuous operation in a joint duct with one end against the flow and the other end for flow i.

It is clear that the pressure in the duct is less than the atmosphere of 1} 1, but 2 of the atmosphere in the duct is continuously moving from the air, but it is not possible for the tubes to clog.

Pressure values at the ends of the tubes 2 through the openings 4 through the tubes / are transmitted to the micro-meter 3.

The true value of speed

pressure (Hg in the duct can be calculated but the following equation:

I,:.//,..-,.

where // gy-value of pipe nokazaniy

ki;

t is a constant value, depending on the tube tube;

Q- flow of air moved but to the duct; air flow is mixed; ae. but no pipe installed in the flow path; q., flow rate of air moved through the pipe after the flow.

To manufacture the proposed non-linear tubes, copper or brass tubes with an internal diameter of not more than 6 mm should be used.

Subject invention

Pneumatic tubes for measuring the total and velocity pressure in the suction pipes, necynj, Hx are dusty air currents, which are due to the fact that, in order to prevent them from clogging with dust during long-term operation, each measuring tube connected at one end to the measuring device has a closed second end connected by a small hole with an additional small diameter tube attached to it along the perimeter, open at both ends and intended to suck into the air pipe from mosfery.

AB 108024

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