RU2844366C1 - Automatic buoy level gauge - Google Patents

Abstract

FIELD: measurement.

SUBSTANCE: invention relates to measuring equipment, in particular to buoy level gauges, and can be used in systems for automatic monitoring and control of parameters of industrial processes. Automatic buoy level gauge has a buoy which is in form of a hollow steel pipe or elastic pipe-hose. In lower part of tube there is plug - micropump, in upper part - plug - suspension for connection of buoy to sensitive element of unit, which converts change of buoy weight into output signal (pneumatic, electric, digital, and so forth) for transmission and fixation on secondary instrument. In the upper part of the buoy pipe there is a hole d for overflow of the controlled liquid from the buoy and into the buoy, which determines the upper measurement limit. Cable from plug - micropump through inner space of pipe and tight channel in suspension is led out to measuring unit and is connected to common power supply with unit.

EFFECT: broader functional capabilities and high measurement accuracy of the buoy level gauge.

1 cl, 1 dwg

Description

The invention relates to measuring equipment, in particular to buoy level gauges, and can be used in automatic control, management and regulation systems for industrial process parameters. The level of the working medium is a process parameter, information about which is necessary to control the operating mode of the process apparatus, and in some cases to control the production process. Buoy level gauges have many advantages, which include a convenient method by which they work (this method is well known: it optimizes the likelihood of possible errors and inaccuracies in the control of liquids). Also, the advantages of buoy level gauges include simplicity of design, a wide range of operating temperatures and pressures, a wide range of applications, etc. The main advantage of a buoy sensor is a fairly simple measurement method. Today, it is one of the easiest, most correct and high-quality. At the same time, due to full automation, this method almost always eliminates errors during research. The main disadvantages of buoy level gauges are:

- dependence of the signal transmission accuracy on the density and temperature of the measured working environment,

- limited application for large (over 16 m) ranges of liquid level measurement (temperature, pressure, volume),

- impossibility of measuring liquid products that adhere to the displacer,

- the level measurement error depends on the correct calibration of the device for operating conditions. If the operating parameters change, the level measurement will be carried out with an increased error. The Great Encyclopedia of Oil and Gas https://www.ngpedia.ru/pg136x3PZ4v4a7q3R9C4m30001002828/

"...If the density of the measured liquid changes at a predetermined moment and for a known period of time, the instrument scales are redesigned and the readings are adjusted. It is impossible to measure the level of a liquid whose density changes randomly using the instruments in question."

The device of a buoy level meter is known, a.s. No. 580453, author N.Ya. Panyunoch and A.M. Bely, a buoy level meter, which has a measurement error corrector, where the buoy suspension lever is made T-shaped 2 F.1, the vertical part of which is connected to the spring 3 F.1 of the zero corrector. This runic correction for a given density of the measured medium in production conditions is performed by a specialist in KIR and A, has a large error.

A device of a buoy level gauge is known, a.s. No. 585496, authors D.I. Buznitsky, T.S. Buyanov and Yu.Yu. Monda, Bukovy level gauge, which has an elastic torsion tube inside the tank and a rotary lever connected to it, at one end of which a buoy is fixed, on the other a compensator, essentially a second buoy, which measures the density of the gas medium above the liquid. The main disadvantage of the level gauge is a narrow scope of application, high-pressure tanks (about 320 kg/m).

The objective of the proposed invention is to expand the functional capabilities and improve the measurement accuracy of a buoy level meter. This objective is achieved by the appropriate design of the buoy of the level meter. In Fig. 1, the level meter has a buoy 1, which is made in the form of a hollow steel pipe or an elastic pipe - a hose. In the lower part, the pipe has a plug - a micropump 2 with a check valve, in the upper part - a plug - a suspension 4 for connecting the buoy to the sensitive element of the unit 5, converting the change in the weight of the buoy into an output signal (pneumatic, electrical, digital, etc.) for transmission and recording on a secondary device. In the upper part of the buoy pipe 1, there is an opening d for overflow of the controlled liquid from the buoy and into the buoy, which determines the upper limit of measurement. Cable 3, from the plug - micropump through the inner space of the pipe and a special sealed channel in the suspension, is led to the unit 5 and is connected to a common power source with the unit. After installing the level gauge on tank 6, it is necessary to pump liquid from tank 6 into the buoy using micro pump 2. When pumping liquid, monitor the change in the output signal of unit 5. Stopping the signal change indicates that the buoy is filled. The hole size d is matched to the pump capacity so that the liquid flows freely from the buoy. When filling the buoy, the buoy weight and the density of the controlled liquid are automatically matched, the entire measurement error is reduced to the instrumental error of the converter of unit 5 and the remote transmission system, i.e. in terms of measurement accuracy it is not inferior to commercial level measurement systems, and in terms of simplicity and reliability it surpasses. Before taking and recording the level gauge readings, it is necessary to pump the buoy. This procedure can be easily automated, and when the temperature of the measured liquid in tank 6 increases, this procedure is generally performed automatically by displacing the liquid from the buoy through hole d. The range of liquid level measurements h is from the lower end of the buoy to hole d at the upper end.

Making a buoy from an elastic pipe - hose will increase the level measurement range from 16 m to 25.40 m and, if desired, more; such a pipe can be rolled into a coil (for example, like firefighters roll up their hoses), it is easier to store, transport and install on a tank.

Sources of information

1. AS No. 585496, author. DI. Buznitsky, T.S. Buyanov and Yu.Yu. Monda, Beech level gauge.

2. AS No. 580453, authors N.Ya. Panyunoch and A.M. Bely, Buoy level gauge.

3. The Great Encyclopedia of Oil and Gas https://www.ngpedia.ru/pg36x3PZ4v4a7a3R9C4m30001002828/

Claims (1)

An automatic buoy level gauge containing a buoy and a buoy weight measurement unit that converts a change in the buoy weight into an output signal, characterized in that the buoy is made in the form of a hollow metal or elastic cylinder that has a plug - a micropump in the lower part, and a plug - a suspension in the upper part for connecting the buoy to the buoy weight measurement unit, through the sealed passage of which the power supply cable of the micropump is fed, and a side opening for overflow of the controlled liquid between the cavities of the buoy and the tank.