JPH04109329U - Liquid level position detection device in container - Google Patents

Abstract

(57) [Summary] (with modifications) [Structure] The present invention is a device for detecting the position of a liquid in a container 1 containing two liquids. The amount of infrared radiation emitted from the liquid portion T1 is measured, and the liquid level position is detected based on the temperature difference between the liquid portion _T1 and the gas portion _T2 . [Effect] Since the sensor part of this device is located outside the container, maintenance and inspection are easy and reliability is improved.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is a device that detects the liquid level position in a liquid container, especially a sensor part outside the container. This relates to equipment that can be installed, constantly inspected, and maintained.

0002

[Conventional technology]

Conventionally, devices for detecting the liquid level position in a liquid container include floats, communication pipes, and controllers. There were capacitor-type liquid level gauges, etc.

0003 However, these conventional devices have sensors inside the container, so data cannot be collected. The reliability of the sensor depends on the reliability and durability of the sensor. The drawback was that there was no way to confirm this. To solve this drawback, the sensor -It is necessary to place the part outside the container so that it can be constantly inspected and maintained.

0004

[Problem that the idea aims to solve]

The purpose of this invention is to eliminate the drawbacks of the prior art described above and to adjust the liquid level position of a container containing liquid. The object of the present invention is to provide a new device that can be located from the outside.

[0005]

[Means to solve the problem]

This invention aims to locate the liquid surface position of a liquid-filled container by covering the entire outer surface of the container. The temperature distribution is measured using an infrared camera placed outside the container and the infrared thermal image processing display device. The liquid level inside the container is detected from this temperature distribution.

[0006]

【Example】

FIG. 1 shows an example of the device of the present invention.

[0007] 1 is a liquid container in which liquid 2, such as water, oil, or other chemicals, is placed. The top of the liquid is the liquid level. In this case, the temperature of liquid 2 and the temperature of gas 6 Therefore, the outer surface of the container is T₁, T₂temperature, which causes Stefan to Infrared radiation that follows Holtzmann's law is emitted. This radiation was detected using infrared camera 3. The infrared thermal image processing display device 4 displays this on the display 5 (CRT). (commonly known as cathode ray tube) Thermal images are displayed in different colors for each 0.1 to 1°C division. As a result, T ₁ , T₂The boundary position of can be revealed, and this position is determined to be the liquid level. It is.

[0008] Generally speaking, when there is liquid in a container, there is liquid on the bottom side, and there is liquid on the top side of the container. space exists. A liquid has a larger heat capacity than a gas such as air in a space, For this reason, temperature changes in the gas part (gas) due to temperature changes throughout the day are almost constant. The air temperature changes without any time delay, but there is a time delay in the liquid part. This results in The temperature difference that occurs between the gas and liquid portions also occurs on the outer surface of the container. This phenomenon can be detected from the outside of the container using an infrared thermal image processing and display device to measure the overall temperature of the outside of the container. The limit boundary area due to the temperature difference between the liquid part and the space part is observed using thermal images. This is determined as the liquid level position.

[0009] In order to improve the detection efficiency of this device, it is necessary to forcibly heat the container using an infrared heater, etc. It is also possible to measure the difference in temperature rise due to the difference in heat capacity.

0010

[Effect of the idea]

The device of the present invention constructed as described above is capable of locating infrared rays emitted from the container from the outside. Since the sensor part is located outside the container, sensor inspection and maintenance are required at all times. It is capable of highly reliable liquid level position detection and has great industrial value. .

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing an embodiment of the device of the present invention.

[Explanation of symbols]

1 container 2 liquid 3 Infrared camera 4 Infrared thermal image processing display device 5 Display status of thermal image 6 gas

Claims (2)

[Scope of utility model registration request] Claim 1: Comprised of an infrared camera disposed outside a liquid-filled container and an infrared thermal image processing display device connected to the camera, the infrared camera measures the amount of infrared radiation emitted from the container over the entire external surface of the container. 1. A liquid level position detection device in a container, which detects the liquid level position in the container by measuring the measured value and displaying the measured value by an infrared thermal image processing display device. 2. Detection of a liquid level position in a container according to claim 1, wherein a heater is provided on the outer periphery of the container, and the container is forcibly heated to detect the liquid level position in the container. Device.