JPS6046421A - Detection of liquid - Google Patents

Abstract

PURPOSE:To detect a liquid by detecting an ultrasonic wave reflected by an inner construction by transmitting the ultrasonic from an outer part in detection of the liquid in the pipes provided with another construction in the inner part. CONSTITUTION:An ultrasonic transmitter 2 is attached to an outer wall of the pipe 1 to transmit the ultrasonic against the inner part. The ultrasonic is irradiated in the diameter direction of the pipe 1, and reflected at a pipe 4 of the inner construction. An ultrasonic receiver 3 is moved slidably along the outer wall of the pipe 1, adjusted to a position where the reflected quantity is largest, i.e., the highest position of receiving sensivity, and the ultrasonic reflected at this position is received. Thereby, the presense and absence of the liquid in the inner part of the pipe 1 are detected.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides: (1) Detecting the presence or absence of liquid stored or transferred from the outside of a pipe or cylindrical container into which another structure is disposed, such as a double pipe, into said container. The present invention relates to a liquid detection method.

Conventionally, this method has been used to detect the presence or absence of liquid in a tube or cylindrical container from the outside without direct contact.

As shown in FIG. 1, a tube or cylindrical container 1 (hereinafter referred to as a container) is shown.

An ultrasonic transmitter 2 and a receiver 3 are mounted diametrically opposite each other on the outer wall of the container (referred to as a container), and the receiver 3 receives the ultrasonic waves emitted from the transmitter 2. A method for detecting the presence or absence of liquid is described, for example, in Japanese Patent Publication No. 31, No. -7/4
It is disclosed in Japanese Patent No. t7 and is well known.

In the above-mentioned known method, the ultrasonic beam emitted from the transmitter 2 traverses the liquid in the container 1 and reaches the receiver 3.
The presence or absence of liquid is detected by utilizing the difference in the transmission characteristics of ultrasonic waves, in which when the inside is empty (in the case of gas), the ultrasonic waves are attenuated significantly and almost never reach the receiver 3. Therefore, if another structure, such as a heating pipe 4, is disposed inside the container 1, as shown by the imaginary line in FIG. The presence or absence of liquid could not be detected because the signal was blocked by the sensor and did not reach the receiver 3.

The present invention has been made in view of such drawbacks, and utilizes the reflection characteristic that the ultrasonic waves emitted from the ultrasonic transmitter 2 collide with the structure 4 inside the container 1 and are reflected at the same time as the straight movement is obstructed. The present invention provides a liquid detection method capable of detecting the presence or absence of liquid in a tube or cylindrical container 1 in which another structure 4 is disposed.

That is, in the method of the present invention, an ultrasonic transmitter is attached to the first wall of a tube or a cylindrical container in which a structure is disposed, and ultrasonic waves are transmitted toward the inside of the container BS. The present invention is characterized in that the presence or absence of liquid in the container is detected by sliding the container against the outer wall of the container and receiving ultrasonic waves reflected and propagated by the structure at a position with high sensitivity to injury.

Next, an embodiment of the present invention will be described based on the drawing of FIG.

Attach an ultrasonic transmitter 2 to the outer wall of the tube or cylindrical container 1,
The first method for transmitting ultrasonic waves into the container 1 is the same as the known method shown in 1. The ultrasonic waves are radiated in the diametrical direction of the container 1, collide with a structure 4 such as a pipe arranged inside the container 1, and are blocked from going straight and are reflected.

In this case, the ultrasonic waves are aligned with the cinema standard, that is, the position with the highest reception sensitivity according to the shape, size, position, etc. of the trench structure 4, and if the ultrasonic waves reflected at this position are received, the inside of the container 1 is detected. The presence or absence of liquid can be detected reliably.

As described above, according to the method of the present invention, liquid inside a pipe or a cylindrical container, such as a double pipe in which extraction was performed inside and outside, or a cylindrical container inside which is disposed, is possible. can be detected reliably, and its practical effects are extremely large.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a conventional liquid detection method, and FIG. 2 is an explanatory diagram of the method of the present invention. 1...Pipe or cylindrical container 2...Ultrasonic transmitter 3
...Ultrasonic receiver 4...Structure (pipe) Patent applicant: Nagaike Sangyo Co., Ltd. Same as above Daiton Okui Electric Co., Ltd. Patent attorney: Hidemichi Kora

Claims (1)

[Claims] 1. An ultrasonic transmitter is attached to the outer wall of a tube or cylindrical container in which a structure is disposed, and ultrasonic waves are transmitted into the container, and an ultrasonic receiver is activated. Liquid detection characterized in that the presence or absence of liquid in the container is detected by receiving ultrasonic waves that slide against the outer wall of the container and are reflected and propagated by the structure at a position with high reception sensitivity. Method. 2. The liquid detection method according to claim 1, wherein the structure is a pipe.