SU1203436A1 - Device for measuring velocity of dust-laden flow of gas - Google Patents

Description

one

The invention relates to the field of measuring motion parameters and can be used to measure the velocity of a gas stream conveying a crushed solid medium.

The purpose of the invention is to increase the reliability of measurements.

Fig. I shows the device assembly, general view; figure 2 - tip, a general view of the section j in FIG. 3 - section AA in FIG. 2.

The device comprises an outer tube 1 with static pressure holes 2 and a static pressure fitting 3, an inner tube 4 which ends in the spout of the combination tube with a total pressure hole 5. The inner tube 4 at the opposite end of the combination tube ends with a common pressure fitting 6. On the tip of the tube, the tip 7 is fixed, consisting of cylindrical 8 and conical 9 parts. A hole 10 is made along the longitudinal axis of the tip, with a diameter equal to the outer diameter of the outer tube 1. This hole is connected with windows 11 made in the cylindrical part. The opening angle of the conical part of the tip is 140-160.

The nozzles of static and total distances are connected via hollow tubes to a recording device, such as a micromanometer (not shown),

The device works as follows.

A tube with a tip attached to the nose and connected to the micromanometer is introduced into the duct through special holes made in it to measure the dynamic (velocity) pressure in the dusty

03436. 2

flow. The tube with a tip is installed in the opposite direction to the air flow so that the longitudinal axis of the tip is parallel to the axis of the pipe.

5 would. Particles of dust moving with the flow of air through the duct, meeting with the tip of the tube, round it and do not fall into the sensor (hole 5) of the total Pressure. So

10 eliminates clogging of the total pressure fitting with dust particles. The air flow around the tip through the window 11 and the hole 10 will create on the sensor 5

15 total pressure, a multiple of the velocity of the moving air stream flowing around the tip, and thus a multiple of the velocity of the air moving in the pipeline. Micro-

A 20 gauge connected in a pneumatic tube will record the difference between this pressure taken from the total pressure connection and the pressure taken from the pressure tube.

25 cera of statistical pressure. Given the measured pressure difference obtained (according to the generally accepted method) to the standard atmosphere, we determine the value of the local air velocity

30 at the measurement point

and - 1.29 f & TT,

where 1,, 29 is a constant value; L N - the value of the difference between the readings of the micromanometer connected to the nozzles of the total and static pressures of the tube with a tip.

. “Such an implementation of the proposed device ensures long-term operation of the device without clogging with dust in highly dusty air streams, for example, in the area of the flour industry of the MOLINE, elevator and feed mill industries.

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7

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 FIG. Mr. A-A

Fig.Z

Editor L.Zaytseva

Compiled by V.Nazarova

Tehred T. Dubinchak Proofreader L. Patay

Order 8411/48 Circulation 896 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Branch GOSH Patent, Uzhgorod, Proektna St., 4

Claims (1)

DEVICE FOR MEASURING SPEED OF A DUSTY GAS FLOW A spacecraft containing a L-shaped tube with openings of full and static pressures connected to a recording device, characterized in that, in order to increase the reliability of measurements, it is equipped with a tip mounted on the tube in the form of a cone mating with a hollow cylindrical part, while on a cylindrical through-hole are made in the part of the tip at the interface with the cone, the angle at the apex of the conical part is 140-160 ^e , and the inner cavity of the tip is connected to the full pressure hole of the tube. fig 1 „1203436