RU2207515C2 - Turbine-type flow meter - Google Patents

Abstract

FIELD: measurement of flow rates of liquid gases. SUBSTANCE: two auxiliary turbines are secured on ends of shaft with fairings located behind them; measuring turbine is mounted at clearance fit on shaft. Proposed instrument may be used for measuring rates both of direct and reverse flows , as well as for measuring flow rate of cryogenic fluids. EFFECT: enhanced accuracy of measurement. 1 dwg

Description

 The invention relates to the field of measuring the flow of liquids or gases and can be used in all sectors of the economy.

 A known turbine flow sensor, in front of the turbine of which flow bodies are installed in the form of a crown of radially diverging spokes, which are mounted on a hub rigidly or elastically connected to the turbine [1].

 The disadvantage of these sensors is the significant dependence of their readings when changing the speed and viscosity of the controlled substance.

 The closest in technical essence to the proposed turbine flowmeter is a turbine flowmeter containing a housing with a calibrated channel, a measuring turbine on the bearings, on the shaft, a shaft in the hub on the bearings, a compensation turbine fixed to the shaft, and input and output fairings and compensation wheels [2].

 The disadvantage of this flow meter is its complexity, the presence of four supports in the sensitive element reduces its reliability, and the design does not allow measuring the reverse flows of the medium being measured.

 The technical result from the use of the invention is to measure the flow rate, either direct or reverse, to reduce the friction force in the bearings, and the use of loose fit on the shaft allows it to be used to measure the flow rate of cryogenic liquids. This is achieved by the fact that at the ends of the shaft there are two auxiliary turbines rigidly fixed to the shaft, input and output guide vanes with hubs are located behind the turbines, and a measuring turbine is placed between them in a loose fit on the shaft.

 The drawing shows a General view of the flow meter.

 The turbine flowmeter consists of a housing 1 with a calibrated channel, a measuring turbine 2, mounted in a loose fit on the shaft 3, shaft supports 5 are placed between two guide devices with hubs 4, two auxiliary turbines 6 and a signal pick-up unit 7 are rigidly fixed at the ends of the shaft 3.

 Turbine flowmeter operates as follows.

 The incoming flow of the pumped liquid acts on auxiliary turbines 6, rigidly mounted on the shaft 3 at the input and output of the calibrated channel of the housing 1, rotates it, passes through the guide apparatus 4, acts on the measuring turbine 2, the rotation of which is fixed and processed by the signal acquisition unit 7. Speed rotation of auxiliary turbines 6 and measuring turbine 2 depends on the volume of pumped fluid and is approximately equal, therefore, the effect of viscosity on accuracy is compensated. After the measuring turbine, the flow passes through the output guide apparatus 4 and the auxiliary turbine 6. When the flow of the medium being measured is reversed, the main and both auxiliary turbines change their rotation, and a signal proportional to the flow rate of the measured medium is also fixed by the signal acquisition unit 7.

LITERATURE
1. A.S. 323658 dated 04/09/1970, C 01 F 1/00.

 2. A.S. 1478046 from 11.06.87, C 01 F 1/00.

Claims (1)

 A turbine flowmeter comprising a housing with a calibrated channel, in which an input guide apparatus with a hub, a measuring turbine, an output guide apparatus with a hub and an auxiliary turbine rigidly mounted on the shaft after the output guide apparatus are sequentially placed, the shaft is mounted in bearings located in the hub, characterized the fact that a second auxiliary turbine, identical to the first, is rigidly fixed to the shaft in front of the input guide vane.