JPH11183234A - Ultrasonic liquid level measuring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a level measuring device measurable a liquid level without errors even if floating matter is present by providing a level converter to obtain the average value or maximum value of measured values while moving a set of an ultrasonic transmitter and a receiver in the horizontal directions in parallel with the liquid level by a moving means at the time of liquid level measurement. SOLUTION: In this device, an ultrasonic device is mounted on a traveling device 4 to enable the ultrasonic device to move in the horizontal direction in parallel with a fluid. The traveling device 4 with wheels is placed on rails 5 for traveling fixed to a supporting object such as a wall surface and can be moved in the direction of the rail installation. In the case that floating matter is present at a liquid level, a converter obtains the average value of measured values at different locations in the traveling of the ultrasonic device, and it is taken as a measured value. In addition, by using the fact that the liquid level is lower than the floating matter, the maximum value of measured values at different locations is taken as a measured value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultrasonic liquid level measuring apparatus which is used in a water treatment system or the like and measures a liquid level using ultrasonic waves.

[0002]

2. Description of the Related Art As shown in FIG. 2, this type of measuring apparatus emits an ultrasonic wave from an ultrasonic transmitter 1 toward a liquid surface to be measured, and converts the ultrasonic wave reflected from the liquid surface into an ultrasonic wave. The sound wave is received by the sound wave receiver 2, and the level converter 3 measures the time from the emission of the ultrasonic wave to the reception of the ultrasonic wave, and the distance to the liquid surface, that is, the measured value of the liquid surface level is obtained from the difference in the time.

[0003]

As shown in FIG. 3, the conventional measuring apparatus has a problem that, when a solid is floating on the liquid surface, the ultrasonic wave hits the floating due to the principle of measurement. A measurement error occurs. In addition, the emitted ultrasonic waves are reflected in an unexpected direction by the suspended matter, so that the ultrasonic waves cannot be received and measurement becomes impossible.

An object of the present invention is to provide an ultrasonic liquid level measuring apparatus capable of performing measurement with a small measurement error even when a floating substance is present on the liquid level.

[0005]

SUMMARY OF THE INVENTION The present invention makes it possible to move an ultrasonic device, which is a set of an ultrasonic transmitter and a receiver, and to move the ultrasonic device when there is a floating substance on a liquid surface to be measured. By doing so, it is possible to perform measurement while avoiding suspended matters, and has the following configuration.

[0006] An ultrasonic wave is emitted from an ultrasonic transmitter to a liquid surface to be measured, an ultrasonic wave reflected from the liquid surface is received by an ultrasonic receiver, and the liquid surface is measured from the time from the emission of the ultrasonic wave to the reception. In an ultrasonic type liquid level measuring device for measuring a level, a moving means for moving a set of the ultrasonic transmitter and the receiver in a horizontal direction of a liquid level when measuring the liquid level is provided, and the liquid level is determined by the moving means. A level converter is provided, which is obtained as an average value or a maximum value of measured values in a moving state.

[0007]

FIG. 1 is an apparatus configuration diagram showing an embodiment of the present invention. 2 differs from FIG. 2 in that an ultrasonic device, which is a set of an ultrasonic transmitter 1 and a receiver 2, is connected to a traveling device 4.
And the ultrasonic device can be moved in the horizontal direction of the liquid level.

[0008] The traveling device 4 is mounted with wheels on a traveling rail 5 fixed to a support such as a wall surface, and is movable in the mounting direction of the rail 5. This movement is performed by remote automatic control by motor drive, self-propelled or manually.

In the case of remote automatic control, for example, a driving motor and a motor operation control device are provided in the traveling device 4,
This is realized by providing a controller for remotely instructing the traveling direction and traveling speed to the operation control device wirelessly or by wire. In the case of the self-propelled system, the traveling device 4 is reciprocated on the rail 5 by periodically operating the motor for a predetermined time by setting a timer.

In such a configuration, the ultrasonic device is
It is possible to move in the direction of the rail 5 with respect to the liquid surface to be measured, and even when there is a floating substance on the liquid surface, the liquid surface level can be accurately measured by measurement avoiding the floating position.

As a method of avoiding the suspended matter,
The transducer 3 obtains an average value of the measured values for each position in the travel of the ultrasonic device and sets the average value as the measured value. Since this method takes an average value, there is a possibility that an error may increase depending on the properties of the suspended matter, but measurement is possible even when the suspended matter is present on the entire measurement path.

On the other hand, taking advantage of the fact that the liquid level is lower than that of the suspended matter, the maximum value of the measured values for each position is used as the measured value. This method is less affected by the occurrence of waves on the liquid surface and the properties of suspended matter, and can provide a measurement with relatively high accuracy.

The movement of the ultrasonic device is not limited to the rail and the traveling device, and the same operation and effect can be obtained by a rotation / rotation system for driving the ultrasonic device around.

[0014]

As described above, according to the present invention, it is possible to make an ultrasonic device which is a set of an ultrasonic transmitter and a receiver movable,
By moving the ultrasonic device when there is a floating substance on the liquid surface to be measured, measurement can be performed while avoiding the floating substance, and even when there is a floating substance on the liquid surface, measurement can be performed with less measurement error effective.

[Brief description of the drawings]

FIG. 1 is an apparatus configuration diagram showing an embodiment of the present invention.

FIG. 2 is a configuration diagram of a conventional apparatus.

FIG. 3 is a diagram illustrating an obstacle due to a floating substance.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Ultrasonic transmitter 2 ... Ultrasonic receiver 3 ... Level converter 4 ... Traveling device 5 ... Traveling rail

Claims (1)

[Claims] 1. An ultrasonic transmitter emits an ultrasonic wave to a liquid surface to be measured, and an ultrasonic wave reflected from the liquid surface is received by an ultrasonic receiver. In an ultrasonic type liquid level measuring device for measuring a liquid level, a moving means for moving a set of the ultrasonic transmitter and the receiver in a horizontal direction of the liquid level when measuring the liquid level is provided, An ultrasonic liquid level measuring device, comprising a level converter for obtaining an average value or a maximum value of measured values in a moving state by means.