CS271806B1 - Device for liquid passage and quantity measuring - Google Patents

Abstract

The device for flow and quantity measurement of liquids is equipped with a measuring chamber (1), in which an oscillator is placed. The oscillator is formed by a hinged oblong finger (8), which is placed in the measuring chamber (1) with its longitudinal axis in the direction of the liquid flow and pivoted on the transverse axis (7), which passes though the broader end of the oblong finger (8), which is reverted from the inlet opening (4) of the measuring chamber (1) and perpendicular to the flow direction of the liquid. The hinged oblong finger (8) has the shape of the wedged object, which is turned with its sharp end against the direction of the liquid flow, and the measuring chamber (1) smoothly widens towards the place against the transverse axis of the hinged oblong finger(8) and again narrows to the width of the inlet opening.<IMAGE>

Description

(57) The device for measuring the flow and quantity of fluid is provided with a measuring chamber (1) in which an oscillator consisting of a swinging elongated finger (8) mounted in the measuring chamber (1) with its longitudinal axis in the fluid flow direction and fixed on rotary Prien OEE {7} _t ěirěim extending end of the elongated fingers (8) * facing away from the inlet opening (4) the measuring chamber (1) and perpendicular to the direction of fluid flow. The swiveling elongated finger (8) has the shape of a wedge-shaped body with a sharp end upstream of the fluid flow, and the measuring chamber (1) extends continuously for grinding against the transverse oee of the elongated finger (8) and narrows again to the outlet opening width.

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CS 271806 Bl

The present invention relates to an apparatus for measuring flow and amount of fluid provided with a flow chamber having an inlet opening on one side and an outlet opening on the opposite side in which an oscillator in the form of an elongated thumb is mounted rotatably about a transverse axis to which it is associated oscillator oscillator frequency.

The prior art fluid flow measuring device is provided with metering members which are actuated by a fluid flow. One of the known metering members of this type is a vane wheel rotatable in a cylindrical chamber where a portion of a pair of vanes and a peripheral wall section of the chamber are dispensed. a certain volume of fluid which is transmitted by the movement of the impeller from the inlet opening to the outlet opening, the amount of fluid flowing being determined by the number of fluid doses. A disadvantage of the measuring device is the relatively high manufacturing complexity and measurement inaccuracy caused by leaks between the blade circumference and the chamber wall. Other known flow and volume measuring devices provided with a movable functional member are provided with fluid oscillators based on fluid flow interaction; solid state diffuser walls · Flow position memory states are created when flowing through the diffuser, the oscillation of the fluid flow being based on the feedback transmission of the true fluid flow from the outlet to the oscillator inlet * The main disadvantage of these fluid oscillators ee is already present at a certain speed of fluid flow in the diffuser.

Therefore, the operation of such devices is possible only from a certain amount of fluid or flow.

There is also known a measuring device 8 with a measuring chamber, at whose outlet opening a plate perpendicular to the fluid flow direction is rotatably mounted. Its oscillating movement is defined by a pair of baffles located on both sides of the central axis of the plate. In this device, the amount of fluid flowing through the chamber is proportional to the number of plate oscillations ·

A similar measuring device is provided with a metering chamber with a fluid flow divider consisting of a U-shaped body and with its central recess facing the inlet duct * From the flow divider downstream A triangular body-shaped oscillator is mounted on the lip bearing. flowing through the measuring chamber β the current divider is divided into two separate currents flowing around the oscillator.

If the current velocity exceeds a certain limit, the oscillator moves, its frequency being proportional to the flow velocity e is sensed by the head 8 of the coil e with a magnet built into the oscillator. For both of these types of measuring devices flow rates, so that small flow rates ee cannot measure them.

It is also known to have an oscillator measuring device consisting of a thin flexible plastic or metal plate arranged downstream of the fluid and clamped at one end to a fixed positioning body, which may have some of the alternative embodiments. The flexible plate is oriented with its free end downstream of the fluid flow and its movement is at least a photoelectric sensor, so that the device is only applicable to some types of fluid. The disadvantage of this device is also the need for complicated shaping of the measuring chamber or the guiding body, and the demanding animation of the device for sensing the movement of the oscillating plate.

The drawbacks of the known devices are overcome by the device for measuring the flow rate and the amount of fluid e through the measuring oscillator according to the invention, characterized in that the elongated thumb has the shape of a wedge body and is mounted in the measuring chamber with a sharp end upstream of the fluid. The swinging elongated finger facing away from the inlet of the metering chamber is perpendicular to the direction of fluid flow.

According to a preferred embodiment of the invention, two limiting stops are provided on each of the two elongated swinging elongated fingers in the space of the measuring chamber.

8-elongated elongated thumb, to define the pivoting movement of the elongated pelvis.

According to another preferred embodiment of the invention, the measuring chamber extends continuously from the first inlet opening to the very broadest ground, which is perpendicular to the

CS 271806 B1 the direction of the fluid flow against the cross-section of the elongated thumb, of which the widest dimension of the chamber is running smoothly to the outlet opening »

The apparatus of the present invention utilizes a hydrodynamic paradoxone and pressure and dynamic flow ile fluids which cause the thumb shaped according to the invention to rock even at low fluid flow rates, the oscillation frequency being ee of considerable accuracy proportional to the volumetric flow so that measurement results are unlike known measuring devices with otherwise shaped oscillator quite accurate. The construction of the entire measuring device, i.e. the measuring chamber and the elongated thumb, is very simple and the device is operationally reliable, and by selecting a sufficient height and length of the thumb arm it is possible to obtain such adjusting forces that mechanical oscillation counters can be used . A further increase in the sensitivity of the device can be achieved by selecting the position of the spacing stops or the asymmetrical device design in which either the thumb is positioned outside the oeu chamber or the shape of the measuring chamber is asymmetric so that even at very low fluid flow speeds.

Examples of embodiments of the device according to the invention are shown in the drawings.

Fig. 2 is a longitudinal cross-sectional view of an apparatus for measuring the amount and flow of a fluid;

The device according to the invention for measuring the flow rate of a fluid quantity is provided with an elongated measuring chamber 1 of variable width whose longitudinal axis lies in the first exemplary embodiment (FIG. 1) in the inlet pipe 2 and the outlet pipe 3i. the piping 2 continuously extends the measuring chamber 1 to its widest point 5, from where it again narrows smoothly to the outlet opening 6 at the beginning of the outlet conduit 3, in the widest ground 5i in the measuring chamber 1 is mounted on the transverse axis 7, perpendicular to the direction of the fluid flow, indicated by the arrow P, a wobble elongated thumb 8 in the form of a wedge-shaped body terminating at its wider end with a cylindrical surface and tapering continuously upstream and parallel and lateral widening of the measuring chamber. On the side walls of the widening part of the measuring chamber 1, stops 9 are fixed to limit the swing of the swinging elongated finger 8,

The apparatus of the present invention utilizes a hydrodynamic paradoxon and pressure and dynamic fluid flow forces that result in a fluid flow flowing about a swinging elongated finger uved to move the swinging elongated thumb β into a regular rocking motion, the frequency of which is proportional to the volume flow of the fluid and may be sensed, wherein the sensed oscillation frequency values are the basis for determining the fluid flow rate.

To change the sensitivity of the device, the meter structure may be asymmetrical, for example, the inlet opening 4 may have a larger cross-section than that of the supply line 2 and may be positioned eccentrically relative to the supply line 2, one of the side walls of the measuring chamber 1 not 2 directly but with a broken step / fig. 2 /.

3 shows a third embodiment of the device according to the invention, in which the measuring chamber 1 has one side wall up to the widest point 5 parallel to the longitudinal axis of the supply line 2, thus extending asymmetrically.

The individual parts of the device may have different specific embodiments depending on the type of fluid being measured. The swinging elongated finger β may have the shape of a wedge-shaped body with a sharp or rounded tip and a rectangular or even rounded cross-section, and may also consist only of sheet metal or another shape of the elongated body. The side walls of the measuring chamber 1 are preferably kinked, they may also be rounded, arranged symmetrically along the elongated axis of the supply line 2 or asymmetrically, wherein in the asymmetrical embodiment one wall of the measuring chamber 1 is more distant from the elongated axis of the supply line 2 than the beginning of the side wall is displaced laterally in a direction perpendicular to this axis and a step is thus formed behind the opening 4. The swinging elongated finger 8 is preferably located in the inlet opening 4 of the measuring chamber 1. However, it can be located behind them in the direction P of the current

CS 271806 B1 or, in some cases, may extend into the inlet port 4. The stops 9 are preferably located on the side of the measuring chamber 11 but may also be located outside the latter if the transverse oe 7 of the rocking elongated JS is led outside the measuring chamber and connected an arm positioned between a pair of stops.

Claims (3)

P I? Ε O Μ Ε T VYNALIEZU 1. A fluid flow metering device e having a flow chamber ee an inlet aperture and an outlet aperture on an opposing side in which an oscillator in the form of an elongated thumb is mounted rotatably about a transverse axis to which it is associated with a sensing device oscillator oscillator frequency characterized in that the elongated finger (8) has the shape of a wedge body and is mounted in the measuring chamber (1) with its sharp end opposite the fluid flow (P), the transverse axis (7) extending through the end portion of the swinging elongated finger (8) facing away from the inlet (4) of the measuring chamber (1) is perpendicular to the direction (P) of the fluid stream. 2. Apparatus according to claim 1, characterized in that on both sides of the swinging elongated finger (8), two erasing stops (9) are provided in the space of the measuring chamber (1) to limit the swiveling movement of the elongated blade (8). 3. Apparatus according to claims 1 and 2, characterized in that the measuring chamber (1) has a continuous and enlarging width from its inlet (4) up to its widest ground (5) which is perpendicular to the direction (P) of the current. fluid against the transverse axis (7) of the elongated finger (8) and from which the walls of the measuring chamber (1) converge continuously to the outlet opening (8).