Buoyancy scanning type polyphase liquid-level interface detection method and detector therefor

Abstract

The invention discloses a buoyancy scanning multiphase liquid location surface detection method, and it is: vertical reciprocating the uniform speed pulling floater, and when it touching liquid location or surface, it produces pulling force mutation, and scanning to detect the mutation moment, and multiplying the floater running speed and time, then amending with the initiation location, so as to come up with the accurate liquid location or surface height value. The detecting device to implement the said detecting method includes the signal processing host, the floater, the driven motor and the pulling sensor, and the floater, whose overall average density greater than the density of measured liquid, has the flat bottom, the pulling sensor connecting on the floater traction line in series, the pulling sensor signals sending into the signal processing host through data transmission channel, the switch signals of the driven motor electrical controller connecting to the signal processing host. The technology scheme can detect the liquid location or surface under the changing conditions of the measured liquid density, and also detect the multi-media crossing surface or liquid location of different densities, each un-mixed multiple liquids and liquid-solid-coexistence, and it has the technical features of simple technical compose, accurate detection, broad application.

Description

Technical field [0001] The invention relates to a liquid level or interface measurement method and its detection instrument. Background technique [0002] Existing liquid level or interface detection instruments mainly include float liquid level gauges, ultrasonic liquid level gauges, radar level gauges and ionizing radiation level gauges. [0003] The float level gauge is mainly composed of a float, a position sensor and an instrument host. The float is usually a hollow sphere or cylinder. It is mainly a position measuring device for measuring the balance between the gravity and the buoyancy on the float. This liquid level gauge can only get a single liquid level value. In actual detection, the overall average density of the float is required to be about one-half of the liquid density, and half of the float in the float is submerged under the liquid surface. The technical problems existing in the existing float level gauge are: first, it can only be used for single liquid...

AI Technical Summary

Problems solved by technology

The technical problems existing in the existing float level gauge are: first, it can only be used for single liquid level detection, but cannot be used for the detection of the interface and liquid level of two or more immiscible multiple media; the second is: It is only suitable for detection occasions where the specific gravity (or density) of the measured liquid is constant. When the specific gravity (or density) of the liquid itself changes, the floating height of the float will change accordingly, resulting in a large measurement error. , cannot even detect

For example, for the same liquid level, when the density of the liquid increases, its buoyancy increases, and the floating position of the float will rise; when the density of the liquid decreases, its buoyancy decreases, and the floating height of the float also decreases, and even sinks into the liquid bottom, causing the measurement to fail

Japanese patent application: JP 7-146167A discloses a technical scheme for detecting the interface and liquid level of molten steel and slag. In the technical scheme, the float is a rod-shaped body with a small sensing area, which greatly affects its detection sensitivity. and detection accuracy technical problems, low resolution

[0004] The other types of liquid level detectors mentioned above, namely ultrasonic liquid level gauges, radar level gauges and ionizing radiation level gauges also have the technical problem of not being able to perform two or more types of non-mixable multi-interface and liquid level detection.

The ionizing radiation liquid level gauge with continuous indication cannot be used for liquid level detection under the state of liquid density change; and there are technical defects such as small range, high cost and potential radiation hazards

Another detection instrument that uses industrial CT vertical imaging to realize multiple interfaces of various media under density changes is expensive, hundreds of times that of conventional liquid level gauges

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