SU1345057A1 - Mass flowmeter - Google Patents

Abstract

The invention relates to a measurement technique and allows to increase the measurement accuracy. The sensing element 8 of the flow meter is made in the form of a measuring sector with a spatula, smoothly bent perpendicular to the plane of rotation of the impeller 1. The component to be measured is fed through a bent nozzle 4, hermetically connected to the housing 5 through the bellows E and a movable seal in the form of a washer 10 of antifriction material. The shape of the sensing element 8 provides quenching the speed of the jet of the incoming component to zero to measure the reaction force. 3 il.

Description

The invention relates to instrumentation and can be used in the food, chemical and pharmaceutical industries.

The aim of the invention is to improve the accuracy of measuring the mass flow rate.

FIG. 1 shows the flow meter, general view; FIG. 2 is a section A-A in FIG. one; FIG. 3 is a section BB in FIG. 2,

The mass flow meter contains an impeller 1 fixed on the shaft 2, a hinge 3 is located on the top of the small wheel, in which there is an opening dp of the branch pipe 4, the impeller is mounted in the housing 5 to which the force-measuring sensor 6 is attached, the cover is closed by the cap 7 on which the sensing element 8 is fixed SILORGE Meritel 6 and bellows 9, to which the washer 10 is fastened of antifriction material,

Mass flow meter works as follows.

The measured component is supplied under pressure through the nozzle 4 (FIG. 1) and falls onto the blades of the impeller 1, which forcibly rotates with the water engine through the shaft 2. As the component leads to the blades of the impeller through a curved inlet nozzle at a strictly defined place, it is thrown away from the blades tangentially to the impeller circumference in a small sector and falls on the sensitive element 8, made in the form of a sector with a blade smoothly bent perpendicular to the plane of rotation of the impeller (Figs. 2 and 3). The measured component arriving at the sensitive element at a constant speed acts on a non-i O with a force

F G V,

where F is the force acting on the sensing element;

five

0

five

0

five

0

five

G - mass flow rate; V is the jet velocity of the incoming component.

In order to replace the reaction force, it is necessary to quench the speed to zero due to friction forces or to rotate the velocity vector by 90 °, which is achieved by performing a sensitive element in the form of a smoothly bent sector that diverts the flow down (Fig. 3). influencing the sensitive element of the air sucked by the impeller, the inner surface of the flow meter is sealed relative to the impeller, while the bellows 9 is attached to the cover 7 on the one hand and to the antifriction washer 10 on the other hand. The anti-friction washer presses against the impeller cover 3 and seals the impeller cavity.

The use of a light sector with a small moment of inertia as a sensitive element of the force meter improves the dynamic properties of the flow meter.

Claims (1)

Invention Formula A mass flow meter containing an inlet, an impeller connected to a drive motor, a sensitive element connected to a load sensor, characterized in that, in order to improve measurement accuracy, the sensitive element is designed as a measuring sector with a blade smoothly bent perpendicular to the rotation plane of the impeller, the nozzle is bent in the direction of the measuring sector and hermetically connected to the housing via a bellows and a movable seal pressed against the impeller, phage