KR900004055Y1 - Machine of compensation of temprature - Google Patents
Machine of compensation of temprature Download PDFInfo
- Publication number
- KR900004055Y1 KR900004055Y1 KR2019870023272U KR870023272U KR900004055Y1 KR 900004055 Y1 KR900004055 Y1 KR 900004055Y1 KR 2019870023272 U KR2019870023272 U KR 2019870023272U KR 870023272 U KR870023272 U KR 870023272U KR 900004055 Y1 KR900004055 Y1 KR 900004055Y1
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- water level
- temperature
- coil
- compensation
- impedance
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K17/00—Measuring quantity of heat
- G01K17/04—Calorimeters using compensation methods, i.e. where the absorbed or released quantity of heat to be measured is compensated by a measured quantity of heating or cooling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/18—Controlling or regulating processes or operations for pouring
- B22D11/181—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level
- B22D11/186—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level by using electric, magnetic, sonic or ultrasonic means
-
- 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
- G01F23/26—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 by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Electromagnetism (AREA)
- Power Engineering (AREA)
- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
내용 없음.No content.
Description
첨부된 도면은 본 고안의 실시예의 개략도이다.The accompanying drawings are schematic views of embodiments of the present invention.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
1 : 탕면검출부 2 : 더미코일부1: Surface detection part 2: Dummy coil part
3 : 탕면검출코일 4 : 더미코일3: hot water detection coil 4: dummy coil
11,12 : 제1,2보상회로11,12: 1st, 2nd compensation circuit
본 고안은 연주용탕 높이 측정에 이용되는 와류식 탕면계의 온도보상장치에 관한 것이다.The present invention relates to a temperature compensating device of a vortex type water level gauge used for measuring the height of a playing bath.
종래 연주용량 높이 측정용 와류식탕면계는 온도변화에 위한 임피던스 변화를 보상하기 위하여 탕면검출코일과 병렬로 부성온도계수의 콘덴서를 연결하는 방식을 취하였다. 이 방식은 온도상승에 의한 탕면검출코일의 인덕턴스값 증가분을 부성온도계수의 콘덴서로 상쇄시키는 것이나 인덕턴스값의 비선형성으로 그 보상효과가 적었다.In the conventional vortex-type water level gauge for measuring the playing capacity, a condenser of negative temperature coefficient is connected in parallel with the water level detection coil in order to compensate for the impedance change due to the temperature change. This method compensates for the increase in inductance value of the surface detection coil due to the temperature rise by the capacitor of the negative temperature coefficient or the nonlinearity of the inductance value.
본 고안의 목적은 기존의 연주용탕높이 측정용 와류식 탕면계의 정도는 온도에 큰 영향을 받으므로, 온도상승에 따른 임피던스증가분을 즉각 감소시키는 보상장치를 제공하므로서 그 온도보상정도를 높이고자 하는데 있다.The purpose of the present invention is to increase the temperature compensation degree by providing a compensation device that immediately reduces the impedance increase due to the temperature rise because the accuracy of the existing vortex type water level gauge for measuring the playing water height is greatly affected by the temperature. have.
이하에서 이를 좀더 구체적으로 설명하여 보면 다음과 같다.This will be described in more detail below.
즉, 제1도와 같이 본 고안은 연주용탕높이 측정용 와류식탕면계의 탕면검출코일(3)과 더미코일(4)에 각각 제1,2 보상회로(11, 12)가 직렬연결된 형태의 탕면검출부(1)와 더미코일부(2)로 구성된다. 상기 제1, 2보상회로(11),(12)는 제1,2인덕턴스소자(11a, 12a)와 제1,2캐폐시턴스소자(11b, 12b)가 각기 병렬로 되어 탕면검출코일(3)과 더미코일(4)에 직결되어진다.That is, as shown in FIG. 1, the present invention is a surface of the type in which the first and second compensation circuits 11 and 12 are connected in series to the water level detection coil 3 and the dummy coil 4 of the vortex type water level gauge for measuring the playing water level, respectively. It consists of the detection part 1 and the dummy coil part 2. In the first and second compensation circuits 11 and 12, the first and second inductance elements 11a and 12a and the first and second capacitance elements 11b and 12b are paralleled, respectively, and the surface detection coil 3 ) And the dummy coil (4).
또, 상기 제1인덕턴스소자(11a)는 그 인덕턴스값이 L, 제2인덕턴스소자는 그 인덕턴스값이 Ld로 주어지는 온도보상용코일이고, 상기 제1캐폐시턴스소자(11b)는 그 캐폐시턴스 값이 C, 제2캐폐시턴스소자(12b)는 Cd로 주어진다.The first inductance element 11a is a temperature compensation coil whose inductance value is L, and the second inductance element is Ld, and the first capacitance element 11b is the capacitance. The value C and the second capacitance element 12b are given by Cd.
미설명부호 5는 증폭도 G의 연산증폭기, 6은 전압e, 50KHz의 기준발진기입력단, 7은 출력단이다.Reference numeral 5 denotes an operational amplifier with an amplification degree G, 6 a voltage e, a reference oscillator input terminal of 50 KHz, and 7 an output terminal.
이와같은 본 고안은 기준발진기입력단(6)에로의 입력에 의해 탕면검출부(1)의 탕면검출코일(3)이 용탕에 자속을 발생시켜 용탕표면에 와전류가 생성되며, 이와전류는 상기탕면검출코일(3)에 유도전류를 발생시켜 그때의 값을 출력단(7)측 5에서 읽으므로서 그 탕면높이를 검출한다. 그런데 용탕온도에 의해서는 제1,2보상회로(11,12)의 제1,2인덕턴스소자(11a, 11b)가 그 인덕턴스값이 증가하여 임피던스값에 오차를 발생시킨다.In the present invention, the tangential current detecting coil 3 of the tangential detection unit 1 generates magnetic flux in the molten metal by input to the reference oscillator input terminal 6, and an eddy current is generated on the molten surface, and the eddy current is the tangential detection coil. An induced current is generated in (3), and the value at that time is read from the output terminal 7 side 5, and the height of the surface is detected. However, the melt temperature causes the first and second inductance elements 11a and 11b of the first and second compensation circuits 11 and 12 to increase their inductance values, thereby causing an error in the impedance value.
일예로 그 출력단(7)측 전압(V)는 제1보상회로(11)의 합성임피던스를 ZA, 제2보상회로(12)의 합성임피던스를 ZB라 하면가 되므로 Z와 ZB가 온도 변화에 대해 일정하게 유지되면 출력에 오차가 없다.For example, when the output impedance of the output terminal 7 side is V, the composite impedance of the first compensation circuit 11 is Z A and the composite impedance of the second compensation circuit 12 is Z B. Since Z and Z B remain constant over temperature changes, there is no error in the output.
또, 탕면검출코일(3)에 대한 온도의 영향을 보상하기 위해 제1인덕턴스소자(11a)와 제1캐폐시턴스소자(11b)를 삽입하였을 때의 합성임피던스는 Z1으로 두면이 된다. 여기서 ω는 각 주파수이다.In addition, when the first inductance element 11a and the first capacitance element 11b are inserted in order to compensate for the influence of the temperature on the water surface detection coil 3, the composite impedance is set to Z 1 . Becomes Where ω is the angular frequency.
또, 온도의 상승에 의한 인덕턴스 Ls의 증가는 Z1의 2번째 항의 분모(1-ω2LC)가 음의 값을 가지도록 L 및 C의 값을 정하면 즉시 Z1은 오차가 줄어들게 된다.In addition, an increase in the inductance Ls of the rise of the temperature is assuming a value of L and C so as to have a negative value of the second term denominator (1- ω 2 LC) of Z 1 Z 1 instantly will drop to an error.
다음 표 1은 시뮬레이션에 의한 실시예를 보이고 있다.Table 1 shows an example by simulation.
[표 1]TABLE 1
여기서 Z1(1)은 측정전 기준온도에서의 종래방식에 의한 제1도 탕면검출코일(3) 부측의 합성임피던스를 나타내며, Z1(2),‥‥‥‥,Z1(10)은 각각 10℃ 상승후의 합성임피던스이다. Z2(1)은 측정전 기준온도에서의 본 고안에 의한 탕면검출부(1)부분의 합성임피던스로서 10℃ 씩 상승후의 합성임피던스는 Z2(2),‥‥‥,Z2(10)로 나타내었다. 기준온도에 대해 90℃ 상승시까지의 임피던스 변화를 조사하였고 임피던스 변동율을 조사하기 위해 종래의 방식에 대해서는Here, Z1 (1) represents the synthetic impedance of the negative side of the 1st drawing surface detection coil 3 by the conventional method at the reference temperature before a measurement, and Z1 (2), ..., ..., Z1 (10) is respectively 10 degreeC. Synthetic impedance after rise. Z2 (1) is the synthetic impedance of the water level detecting part 1 according to the present invention at the reference temperature before measurement, and the synthetic impedance after 10 ° C. rise is represented by Z2 (2), ..., ..., Z2 (10). Impedance changes up to 90 ° C with respect to the reference temperature were investigated.
K1(1)=(Z1(2)-Z1(1))/Z1(1), K1(2)=(Z1(3)-Z1(2))/Z1(2),‥‥,K1(9) =(Z1(10)-Z1(9))/Z1(9)K1 (1) = (Z1 (2) -Z1 (1)) / Z1 (1), K1 (2) = (Z1 (3) -Z1 (2)) / Z1 (2), ..., K1 (9 ) = (Z1 (10) -Z1 (9)) / Z1 (9)
로 되고 본 고안에 대해서는About this invention
K2(1)=(Z2(2)-Z2(1))/Z2(1), K2(2)=(Z2(3)-Z2(2))/Z2(2),‥‥‥,K2(9)=(Z2(10)-Z2(9))/Z2(9) 을 조사하였다. 그 결과 종래방식은 측정을 위해 측정연주몰드 용탕위에 위치하였을때 처음 온도상승때 큰오차를 나타낸뒤 이후 안정되나 본 고안은 90℃ 상승할때까지 오차가 훨씬 적음을 알수 있다.K2 (1) = (Z2 (2) -Z2 (1)) / Z2 (1), K2 (2) = (Z2 (3) -Z2 (2)) / Z2 (2), ... 9) = (Z2 (10) -Z2 (9)) / Z2 (9) was investigated. As a result, the conventional method shows a large error at the first temperature rise when positioned on the measurement casting mold molten metal for measurement, and then stabilizes, but the present invention shows that the error is much smaller until the temperature rises to 90 ° C.
따라서 본 고안은 이에 의해 용탕에 의한 와류식 탕면계의 임피던스 변화를 줄일 수 있어 보다 정확한 용탕높이 검출이 가능한 효과가 있다. 또한 코일 혹은 인덕턴스성분의 계측시 온도에 의한 변화를 보상할 수 있다.Therefore, the present invention can reduce the change in the impedance of the vortex type water level meter caused by the molten metal, thereby making it possible to detect the molten metal height more accurately. In addition, it is possible to compensate for changes due to temperature when measuring coils or inductance components.
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Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019870023272U KR900004055Y1 (en) | 1987-12-28 | 1987-12-28 | Machine of compensation of temprature |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019870023272U KR900004055Y1 (en) | 1987-12-28 | 1987-12-28 | Machine of compensation of temprature |
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| Publication Number | Publication Date |
|---|---|
| KR890014062U KR890014062U (en) | 1989-08-10 |
| KR900004055Y1 true KR900004055Y1 (en) | 1990-05-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| KR2019870023272U KR900004055Y1 (en) | 1987-12-28 | 1987-12-28 | Machine of compensation of temprature |
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| KR (1) | KR900004055Y1 (en) |
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1987
- 1987-12-28 KR KR2019870023272U patent/KR900004055Y1/en not_active IP Right Cessation
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| KR890014062U (en) | 1989-08-10 |
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