SK3402004A3 - Specific automatic voluminal measuring device for liquids - Google Patents

Abstract

Subject matter of invention is increase of accuracy automatic ration of liquids, which is reached by suitable shape of measuring vessel (1) liquid level gauge (5) and three way valve (3), which is connected with decoding, timing and supply unit (4).

Description

Accurate volumetric measurement and dosing of liquids in science, technology and other fields where accurate measurement and dosing of liquids such as e.g. in transport, but also in various technological processes.

BACKGROUND ART OF THE INVENTION

At present, liquid volume measuring devices are used outside of laboratory equipment:

- flowmeters based on the principle of utilization of the purse, its speed being proportional to the flowing amount of liquid

- flowmeters on the principle of gear pumps, but with the opposite use in the sense that these pumps are driven by the flowing liquid and their speed is proportional to the amount of flowing liquid

- piston gauges for liquid quantity

liquid volume meters by measuring its velocity by means of orifice or the like

More generally, it is possible to state that the flue-gas flow meters do not operate at minimum flow rates and their characteristics are non-linear in the area of low flow rates, while being affordable but their accuracy of about ± 2% is unsatisfactory for more accurate measurements.

All of the following fluid meters are more expensive and the accuracy reported is also about ± 2%.

SUMMARY OF THE INVENTION

The invention relates to the precise automatic measurement of the volume of liquids in various fields of industry, transport, medical, operating and technological dosing, but also in laboratories.

The first principle of the invention is that the device consists of a measuring container 1 which, by virtue of its shape, makes it possible both to fill and empty the liquid completely and to empty its entire volume, even when the container is deflected by a considerable spatial angle relative to its not drawn verical axis. The shape of the container J allows it to be transformed, when it is filled or emptied with liquid to the end and the beginning of a given volume, also a relatively small volume unit of liquid to a substantially greater level of lift than in a larger cross-section of the container.

This change is most pronounced when the liquid has been filled or emptied into the tapered upper or lower part of the measuring container 1, which serves as the upper level indicator 5 and the lower level indicator 8 relative to the liquid level sensor 2. Using the upper level indicator 5 with respect to the mouth of the tube 7 (when filling the container) and the liquid level sensor 2 relative to the level indicator 8 (when emptying the container), the correct filling and emptying volume of the container is made with considerable accuracy; For example, for a dose of, for example, 1 liter in ± tenths of a percent. We can also obtain, by means of the three-way valve 3 and the evaluation, timing and supply circuit 4, one dose of liquid of the correct volume.

A second principle of the invention is that the liquid level sensor 2 is connected to an evaluation, timing and supply circuit 4 which is connected to a three-way solenoid valve 3.

Another principle of the invention is that the solenoid three-way valve 3 is replaced by a non-drawn two-way solenoid valve and the liquid supply is provided at another non-drawn position of the measuring container 1 so that it can be filled correctly and emptied through the two-way valve.

A particular connection of a precision automatic volumetric metering device using the first and second essence of the invention is shown in FIG. 1. This connection allows for automatic re-metering, the advantage of which is that the device can also operate under relatively complicated ambient conditions, in particular the variation of the spatial angle with respect to the vertical axis not drawn.

The disadvantage of said device is that due to the need for filling and emptying, it is slower than flow rate and gives information on the number of precise doses and not on the instantaneous value of the liquid withdrawn while being much more accurate in summary notion but also in individual doses.

Thus, the total volume of liquid collected with a relatively high accuracy of about ± 0.5% is known.

DESCRIPTION OF EXAMPLE OF EMBODIMENTS OF THE INVENTION

The principle of operation is explained with reference to FIG. 1 and assume the initial state that the vessel I is refusing and part of the level indicator 5 is empty.

At the inlet of the three-way solenoid valve 3 a non-drawn tube is supplied in which the liquid from the tank or other device is under a certain pressure and which is to be measured.

The initial state is that the evaluation, timing and power circuit 4 is not turned on and the valve 3 and the level sensor 2 are also not turned on, with the valve 3 in a position that is closed from the inlet to the metering vessel 1 and vice versa but open from the outlet to the metering vessel and vice versa.

The tube 8 is used of a suitable material (e.g. plastic) so that a level sensor 2 of any suitable type (in the exemplary embodiment, a capacitive sensor) can be used.

FILLING MEASURING CONTAINER 1 AND PART OF STAINLESS 5 WITH LIQUID after switching on with a 4_disconnected switch, it will permanently feed 2 and for a set period of time also valve 3 while valve 3 will switch to the second position compared to the idle state by opening OPEN to I and vice versa, but closed from the outlet to 1 and vice versa.

This starts to fill the liquid through the valve 3 of the vessel 1 to the upper level indicator 5 while the timing circuit v 4 keeps the valve 3 in the said state - until the measuring vessel 1 is filled and the level reaches the level indicator 5 until the liquid level exceeds the upper part. of the overflow pipe 7 and the liquid flows through the overflow pipe 7 to an unconstructed tank or other unreported device.

This overflow through the overflow tube 7 lasts for a sufficient period of time before the impulse through which the valve 3 is turned on and held to return to the first position as described above is lost.

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EMPTYING THE VOLUME CONTAINER 1 AND PART OF THE CONTAINER 5 WITH LIQUID - that is, after returning 3 to the first position and filled container 1 and part 5, 3 will be closed from the INPUT to i and vice versa, but open from the OUTPUT to 1 and vice versa. the liquid is drained into the undamaged container from all of volume I and part 5.

By such a switch 3, after the impulse from the time circuit of the device 4, the liquid level in the part of the level indicator 5 has started to decrease, whereby at the interface of the overflow tube 7 the liquid is divided into two parts. and the second which is in the volume of the overflow pipe 7 and thus separately also flows from the part 7 through the outlet and into an unconstructed tank or other device than the measured volume of liquid, given by the volume i and part 5.

This volume measurement is done with relatively high accuracy.

The liquid which was at the time of leakage from 5 and 1 in the overflow pipe 7 will flow into the overflow tank or other device.

In this described process, when the level begins to drop, it is formed in the region of the valve 6 from the sides 5 and i respectively. 7 a certain negative pressure relative to the atmosphere, when the valve 6 opens and allows the liquid to escape, while at filling 1 and 5 as well as the flow to 7 the 6 is closed to the atmosphere.

Elsewhere, it is indicated that the level sensor 2 has been continuously powered since it was switched on 4.

As the fluid level from Part 5 and I decreases through 3 and OUTLET, the level in level indicator 8 reaches the active region of the liquid level sensor 2, which at a particular level level with a certain tolerance sends a pulse to 4, reactivating the time circuit and it again closes 3 and the container 1 and 5 subsequently overflow through 7 are started to be filled and the liquid metering process is repeated automatically as described above.

It should be emphasized that this metering effect is achieved by using the first and second described principles of the invention and selecting a sufficient pulse length in the time circuit of the device 4, which must be long enough for a particular device to provide sufficient liquid overflow to 7.

In the evaluation circuit of the device 4, which is a non-plotted mechanical or electronic counter with the possibility of transfer to a computer, said filling and emptying cycle is counted as one metered dose of a specific and fixed set volume.

INDUSTRIAL APPLICABILITY

The invention is applicable wherever both automatic and non-automatic dosing of liquids with an accuracy of one-tenth of the measured volume is required, even under relatively difficult ambient deflection conditions and vibration of said metering device.

Taking advantage of the foregoing, in view of the relatively high accuracy of up to about ± 0.5%, this device is very useful with the addition of a non-drawn tank for measuring the fuel consumption of all types of motor vehicles directly on the vehicle.

Accuracy achieved has a significant impact on the economy of operation of motor vehicles, such as: early detection of poor technical condition of vehicles in relation to fuel consumption, etc.

Further use of the invention may be in a variety of technological processes where the stated accuracy is sufficient.

Claims (5)

1, A precision automatic volumetric liquid metering device, characterized in that it consists of a metering vessel (1) of desired volume, which in the upper or lower part is gradually continuously tapered to a smaller cross section than the other part of the vessel. a liquid level sensor (2) connected to the evaluation, timing and supply circuit (4), which is connected to the valve (3) and a non-drawn liquid pressure source or even from the upper level indicator (5) closed by the valve (6) ) and overflow pipe (7). 2, The precision automatic volumetric liquid metering device according to 1, characterized in that the three-way solenoid valve (3) is replaced by another non-plotted valve of the appropriate type and (SUPPLY) is connected to the container (1) in another non-plotted suitable location. (4) a source of liquid pressure. 3. A precise automatic volumetric liquid metering device according to 1 and 2, characterized in that the entire required volume is formed by a measuring vessel of equal cross-section of sufficient length. Precision automatic volumetric liquid metering device according to 1, 2 and 3, characterized in that the level indicator (5) and the valve (6) are replaced by a non-drawn valve of the appropriate type. Precision automatic volumetric liquid metering device according to 1, 2, 3 and 4, characterized in that the valve (6) is not used in certain circumstances and the supply from the level gauge (5) to it is closed.