JPS5927223A - Liquid level detecting sensor - Google Patents
Liquid level detecting sensorInfo
- Publication number
- JPS5927223A JPS5927223A JP13765982A JP13765982A JPS5927223A JP S5927223 A JPS5927223 A JP S5927223A JP 13765982 A JP13765982 A JP 13765982A JP 13765982 A JP13765982 A JP 13765982A JP S5927223 A JPS5927223 A JP S5927223A
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- liquid level
- heating resistor
- temperature sensor
- liquefied gas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
Abstract
Description
【発明の詳細な説明】
この発明は、低温液化ガスの貯槽等における液面検出セ
ンサの改良に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a liquid level detection sensor in a low temperature liquefied gas storage tank or the like.
従来この種の装置として第１図の模式図に示すものがあ
った。第２図は第１図の発熱抵抗体を粘化ガス貯槽に取
り付けた状態、また第３図は発熱抵抗体の発生電圧特性
を示すものである。Conventionally, there has been a device of this type as shown in the schematic diagram of FIG. FIG. 2 shows the heating resistor shown in FIG. 1 attached to a viscous gas storage tank, and FIG. 3 shows the generated voltage characteristics of the heating resistor.
図において、（１）は電源、（２１は液化ガスの液面を
検出するための発熱抵抗体、（３）は電圧計、（４）は
低温液化ガス貯槽、（５）は支持材、（６）は低温液化
ガスのガス層、（７）は低温液化ガスの液面１の状態、
（８）は低温液化ガスの■の状態、Ｆ９＋は発熱抵抗体
（２）の発生電圧特性曲線、（Ａ）は発生電圧曲線上の
液面ｌの状態の点、（Ｂｌは発生電圧曲線上の液面■の
状態の点である。In the figure, (1) is a power supply, (21 is a heating resistor for detecting the liquid level of liquefied gas, (3) is a voltmeter, (4) is a low-temperature liquefied gas storage tank, (5) is a support material, ( 6) is the gas layer of low-temperature liquefied gas, (7) is the state of liquid level 1 of low-temperature liquefied gas,
(8) is the state of the low-temperature liquefied gas, F9+ is the generated voltage characteristic curve of the heating resistor (2), (A) is the point at the liquid level l on the generated voltage curve, (Bl is the point on the generated voltage curve) This is the point at which the liquid level is in the state of ■.
次に動作について説明する。Next, the operation will be explained.
発熱抵抗体（２）は外部の電源（１）により電流を供給
され、ジュール発熱により温度上昇により抵抗が変化す
る。この抵抗値は、電圧計（３）の指示値により求まる
。The heating resistor (2) is supplied with current by the external power source (1), and its resistance changes as the temperature rises due to Joule heat generation. This resistance value is determined by the indicated value of the voltmeter (3).
いま、この発熱抵抗体（２）を低温液化ガス貯槽（４］
の（２：はガス層部（６）に置かれることになり外部へ
の熱の放散量は少ないため温度が上昇して発生電圧も上
昇する。つまり、第３図の発生電圧特性曲線上の８点で
あり、この時の電圧は■２である。また液化ガスの液面
が上昇して、■の状態（７）では発熱抵抗体（２）は、
液層部に置かれることになり、まわりの液体で冷却され
るため熱の放熱量が多くなる。Now, this heating resistor (2) is connected to the low temperature liquefied gas storage tank (4).
(2) is placed in the gas layer part (6), and the amount of heat dissipated to the outside is small, so the temperature rises and the generated voltage also increases.In other words, on the generated voltage characteristic curve in Figure 3, 8 points, and the voltage at this time is ■2.Also, the liquid level of the liquefied gas rises, and in state (7) of ■, the heating resistor (2)
Since it is placed in a liquid layer and is cooled by the surrounding liquid, a large amount of heat is dissipated.
この結果温度が下り発生電圧も下る。この時は第３図の
発生電圧特性曲線上のＡ点となり、電圧はｖｌである。As a result, the temperature decreases and the generated voltage also decreases. At this time, it becomes point A on the generated voltage characteristic curve in FIG. 3, and the voltage is vl.
このように発熱抵抗体（２）が液層部に置かれる場合と
ガス層部に置かれる場合の発生電圧の変化を読むことに
より、液体の有無を知ることができる。In this way, by reading the change in the generated voltage when the heating resistor (2) is placed in the liquid layer section and when it is placed in the gas layer section, the presence or absence of liquid can be determined.
しかしながら一般に使用される発熱抵抗体（２）は第３
図のように温度の変化ｔｚ−ｔｔは大きいが極低温状態
では温度に対する抵抗変化が弱くなるため電圧変化Ｖ２
− Ｖｓは小さい。However, the commonly used heating resistor (2) is
As shown in the figure, the change in temperature tz-tt is large, but in extremely low temperatures the change in resistance with respect to temperature becomes weaker, so the voltage change V2
- Vs is small.
従来の装置は以上のように構成されているので、液体の
有無を知るための電圧の変化Ｖ２−Ｖｌの値が小さいた
め感度が低く、また正確な液面を検知することが困難で
あるなどの欠点があった。Since the conventional device is configured as described above, the value of the voltage change V2-Vl used to determine the presence or absence of liquid is small, resulting in low sensitivity and difficulty in accurately detecting the liquid level. There was a drawback.
この発明は上記従来のものの欠点を除去するためになさ
れたもので、発熱抵抗体にその温度を測定するための温
度センサを取り付けて、温度センサの発生電圧を読むこ
とにより、感度が高く、容易に正確な液面が指示できる
液面検出センサを提供することを目的としている。This invention was made in order to eliminate the drawbacks of the above-mentioned conventional devices, and by attaching a temperature sensor to the heating resistor to measure its temperature and reading the voltage generated by the temperature sensor, it is highly sensitive and easy to use. The purpose of this invention is to provide a liquid level detection sensor that can accurately indicate the liquid level.
以下この発明の一実施例を図について説明する。第４図
において、（１１は電源、（２）は発熱抵抗体（例えば
カーボン抵抗体）、（３）は電圧針、０１）は温度セン
サ、この温度センサは熱電対を発熱抵抗体に付着して形
成している。また第５図においてθつは温度センサの発
生電圧特性曲線、（Ａ）は発生電圧特性曲線上で、液化
ガス液面■の状態の点、＋８１は同じく発生電圧特性曲
線上で液化ガス液面Ｈの状態の点である。An embodiment of the present invention will be described below with reference to the drawings. In Figure 4, (11 is a power supply, (2) is a heating resistor (for example, a carbon resistor), (3) is a voltage needle, and 01) is a temperature sensor. This temperature sensor has a thermocouple attached to the heating resistor. It is formed by In Fig. 5, θ is the generated voltage characteristic curve of the temperature sensor, (A) is the point on the generated voltage characteristic curve where the liquefied gas liquid level is ■, and +81 is the point on the generated voltage characteristic curve where the liquefied gas liquid level is. This is the point in the H state.
発熱抵抗体（２）は従来装置と同様に外部の電源＋１１
により電流が供給されジュール発熱により温度が上昇し
ている。また温度センサαυは発熱抵抗体（２）と熱的
に接触されてこの温度変化によって第５図のような発生
電圧曲線を持っている。The heating resistor (2) is connected to an external power supply +11 as in the conventional device.
Current is supplied and the temperature rises due to Joule heat generation. The temperature sensor αυ is in thermal contact with the heating resistor (2) and has a generated voltage curve as shown in FIG. 5 due to this temperature change.
このように発熱抵抗体（２）と温度センサαυを組み合
せたものを例えば低温液化ガス貯槽に取り付けた場合、
液面■の状態では発熱抵抗体（２）の温度はｔｌで、Ｂ
点すなわち温度センサαυの発生電圧はｖ２である。For example, when a combination of the heating resistor (2) and the temperature sensor αυ is attached to a low-temperature liquefied gas storage tank,
When the liquid level is ■, the temperature of the heating resistor (2) is tl, and B
The voltage generated at the point, ie, the temperature sensor αυ, is v2.
また液面ｌの状態では、発熱抵抗体（２）の温度はｔｌ
でＡ点、すなわち温度センサ住υの発生電圧はＶｌであ
る。In addition, when the liquid level is l, the temperature of the heating resistor (2) is tl
At point A, that is, the voltage generated at the temperature sensor υ is Vl.
一般に温度センサ（Ｌｌ）は小さな温度変化に対しても
発生する電圧変化の大きいものが使用されるため、第５
図のように、温度変化ｔ２−ｔｌに対して電圧の変化Ｖ
２−Ｖｌの大きな値が得られる。Generally, a temperature sensor (Ll) is used that generates a large voltage change even in response to a small temperature change.
As shown in the figure, the voltage change V with respect to the temperature change t2-tl
A large value of 2-Vl is obtained.
以上のように、この発明によれば発熱抵抗体に発生電圧
変化の大きい温度センサを熱的に接触させる構成にした
ので、感度が高く、容易に正確な液面が指示できる液面
検出センサが得られる効果がある。As described above, according to the present invention, a temperature sensor with a large change in generated voltage is brought into thermal contact with a heating resistor, so a liquid level detection sensor that has high sensitivity and can easily indicate an accurate liquid level can be obtained. There are benefits to be gained.
第１図は従来の低温液化ガス液面検出センサを示す模式
図、第２図は上記センサを取りつけた低温液化ガス貯槽
の断面図、第３図は上記センサの発生電圧特性曲線を示
す特性図、第４図はこの発明の一実施例による液面検出
センサの模式図、第５図は第４図のセンサの発生電圧特
性曲線を示す特性図である。
図中、（１）・・・電源、（２）・・・発熱抵抗体、（
３）・・・電圧計、（４）・・・低温液化ガス貯槽、圓
・・・温度センサ、なお、図中同一符号は同一、又は相
当部分を示す。
代理人 葛野信−
第１図
第２図
第３図
澁鷹−
第４図
第５図
−／ＩＬ及−Figure 1 is a schematic diagram showing a conventional low-temperature liquefied gas liquid level detection sensor, Figure 2 is a sectional view of a low-temperature liquefied gas storage tank equipped with the above sensor, and Figure 3 is a characteristic diagram showing the generated voltage characteristic curve of the above sensor. , FIG. 4 is a schematic diagram of a liquid level detection sensor according to an embodiment of the present invention, and FIG. 5 is a characteristic diagram showing a generated voltage characteristic curve of the sensor of FIG. 4. In the figure, (1)...power supply, (2)...heating resistor, (
3)...Voltmeter, (4)...Low temperature liquefied gas storage tank, En...Temperature sensor. Note that the same reference numerals in the drawings indicate the same or equivalent parts. Agent Makoto Kuzuno- Figure 1 Figure 2 Figure 3 Shibuya- Figure 4 Figure 5-/IL and-
Claims (1)
囲気より温度上昇する発熱体、この発熱体の温度を測定
するために上記発熱体に取り付けられた温度センサで構
成され、液中およびガス中でそれぞれ上記発熱体の温度
を上記温度センサで測定し、それぞれの出力信号の変化
によって上記液化ガスの液面を検知することを特徴とす
る液面検出センサ。It consists of a heating element whose temperature rises above the surrounding atmosphere due to Joule heat generated by the current supplied from the power supply, and a temperature sensor attached to the heating element to measure the temperature of this heating element. A liquid level detection sensor characterized in that the temperature of the heating element is measured by the temperature sensor, and the liquid level of the liquefied gas is detected based on a change in each output signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13765982A JPS5927223A (en) | 1982-08-05 | 1982-08-05 | Liquid level detecting sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13765982A JPS5927223A (en) | 1982-08-05 | 1982-08-05 | Liquid level detecting sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5927223A true JPS5927223A (en) | 1984-02-13 |
Family
ID=15203807
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13765982A Pending JPS5927223A (en) | 1982-08-05 | 1982-08-05 | Liquid level detecting sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5927223A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61128716U (en) * | 1985-01-28 | 1986-08-12 | ||
| JPS61128715U (en) * | 1985-01-28 | 1986-08-12 | ||
| WO2018073902A1 (en) | 2016-10-19 | 2018-04-26 | 三菱電機株式会社 | Liquid level sensor and refrigeration cycle system |
| US10274357B2 (en) | 2014-10-16 | 2019-04-30 | Mitsubishi Electric Corporation | Refrigeration cycle apparatus and liquid level detection sensor |
-
1982
- 1982-08-05 JP JP13765982A patent/JPS5927223A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61128716U (en) * | 1985-01-28 | 1986-08-12 | ||
| JPS61128715U (en) * | 1985-01-28 | 1986-08-12 | ||
| US10274357B2 (en) | 2014-10-16 | 2019-04-30 | Mitsubishi Electric Corporation | Refrigeration cycle apparatus and liquid level detection sensor |
| WO2018073902A1 (en) | 2016-10-19 | 2018-04-26 | 三菱電機株式会社 | Liquid level sensor and refrigeration cycle system |
| US11493248B2 (en) | 2016-10-19 | 2022-11-08 | Mitsubishi Electric Corporation | Liquid level detection device and refrigeration cycle apparatus |
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