CN1170151C - Sensor for measuring carbon potential and nitrogen potential - Google Patents
Sensor for measuring carbon potential and nitrogen potential Download PDFInfo
- Publication number
- CN1170151C CN1170151C CNB011150254A CN01115025A CN1170151C CN 1170151 C CN1170151 C CN 1170151C CN B011150254 A CNB011150254 A CN B011150254A CN 01115025 A CN01115025 A CN 01115025A CN 1170151 C CN1170151 C CN 1170151C
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- resistance sheet
- sensor
- metallic resistance
- sheet
- metal
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Abstract
The present invention belongs to the atmosphere measurement technology in the heat treatment. A measuring sensor is composed of a metal resistance sheet and two lead wires, wherein the carbon content of the metal resistance sheet is smaller than 1.3%, and the metal resistance sheet has the thickness: 0.05 to 0.40mm, the width: 0.4 to 6mm, and the length: 10 to 300mm; one lead wire is connected with both ends of the metal resistance sheet and is used for providing the working current; the other lead wire is connected with both ends of the metal resistance sheet and is used for measuring the voltage at both ends of the metal resistance sheet. A carbon potential value or a nitrogen potential value is determined by a measured resistance value of the metal resistance sheet. The sensor of the present invention is suitable for directly measuring the carbon potential value or the nitrogen potential value in a furnace. The sensor has the characteristics of long service life of the resistance sheet, convenient replacement and low cost.
Description
Affiliated technical field
The invention belongs to atmosphere measuring technique in the thermal treatment, relate generally to a kind of sensor that carbon potential is used of at high temperature measuring.This sensor is particularly useful in cementing furnace, in the atmosphere controlled heat treatment furnace, in the controlled atmosphere generator and other is by changing the measurement of atmosphere carbon potential that the furnace atmosphere carbon potential reaches the purpose of carburizing or anti-oxidation, decarburization.
Background technology
In existing carbon potential measurement, pure iron silk or nickel alloy wire sensor (being commonly referred to heat wire method) are arranged with the immediate sensor of the present invention.This sensor is that the diameter pure iron that is φ 0.08-0.20mm, long 300-1000mm or iron-nickel alloy wire are wrapped in quartz, aluminium oxide or other at high temperature on the skeleton of good insulating, the silk two ends are welded on the little lead of resistance value, during measurement, sensor is inserted in the atmosphere to be measured, measure the resistance value (resistance value that has in fact also comprised lead) of silk, calculate the carbon potential of atmosphere according to the resistance value size.This sensor is compared with oxygen probe method at present with the most use, it is low and be not subjected to the advantage of the influence that atmosphere forms to have the probe cost, but because used silk is not only thin but also long, fracture easily at high temperature, serviceable life is shorter, changes silk also convenient inadequately (needing welding).
The resistance that this structural design mode requires the sensor silk is big (resistance that just can ignore lead in this case) enough.
Summary of the invention
The purpose of this invention is to provide a kind of life-span long, change the sensor that electric-resistivity method carbon determination gesture is easily used.
The sensor that the present invention proposes is: mainly by a carbon content less than 1.3%, 0.05-0.40mm is thick, 0.4-6mm is wide, 10-300mm is long metallic resistance sheet, be connected metallic resistance sheet two ends and be used for the lead that provides working current to it, be connected the lead that metallic resistance sheet two ends are used for measuring by it metallic resistance sheet both end voltage and constitute.
Two leads connect an end of metallic resistance sheet respectively by sheet metal, constitute the loop that the metallic resistance sheet provides working current; Two leads are respectively by bonding jumper in addition, and metal sheeting is connected with an end of metallic resistance sheet, constitutes the loop of measuring metallic resistance sheet both end voltage.Wherein, metal sheeting connects sheet metal, bonding jumper and metallic resistance sheet.
Sheet metal and bonding jumper are fixed on the insulator, make them can not make relative motion and maintenance mutually insulated.
Thermopair is housed on the sensor, is used to measure metallic resistance sheet temperature on every side.
The sensor that the present invention proposes adopts four line modes, and two leads that working current promptly is provided separate with two leads of measuring voltage, and the mode of this measuring resistance has nothing to do with conductor resistance is big or small, so its resistance can be little or very little.The metallic resistance sheet can be designed to the frame mode that section ratio is big, length is short thus, have the characteristics of long service life, its structural design mode also has the characteristics easily of changing.
Description of drawings
Accompanying drawing 1 is Fundamentals of Sensors figure of the present invention.
Accompanying drawing 2 is sensor synoptic diagram of the present invention.
Accompanying drawing 3 is the high-temperature insulation skeleton synoptic diagram of fixing metal sheet and bonding jumper.
Accompanying drawing 4 is that Fig. 3 A is to view.
Accompanying drawing 5 is sensor assembly structure synoptic diagram of the present invention.
Accompanying drawing 6 is that Fig. 5 A is to view.
Embodiment
The accompanying drawing that provides is in conjunction with the embodiments further specified the present invention:
As shown in Figure 1, the sensor that the present invention proposes mainly by a carbon content less than 1.3%, 0.05-0.40mm is thick, 0.4-6mm is wide, 10-300mm is long metallic resistance sheet 1, be connected metallic resistance sheet two ends and be used for the lead 6 that provides working current to it, be connected the lead 7 that metallic resistance sheet two ends are used for measuring by it metallic resistance sheet both end voltage and constitute.
As shown in Figure 2, sensor of the present invention comprises metallic resistance sheet 1, for the metallic resistance sheet provides the lead 6 of working current, measures the lead 7 of metallic resistance sheet both end voltage by it; Lead 6 is connected with the two ends of metallic resistance sheet 1 by sheet metal 2 (lead 6 is welded on the sheet metal 2), constitutes the loop that metallic resistance sheet 1 provides working current; It is lead 6--sheet metal 2--metallic resistance sheet 1--sheet metal 2--lead 6; Lead 7 is connected metallic resistance sheet 1 two ends (lead 7 is welded on the bonding jumper 5, and bonding jumper 5 joins with metal sheeting 3) by bonding jumper 5, metal sheeting 3, constitutes the loop of measuring metallic resistance sheet both end voltage by it; It is lead 7--bonding jumper 5--metal sheeting 3--metallic resistance sheet 1--metal sheeting 3--bonding jumper 5--lead 7.Metallic resistance sheet 1 two ends are crushed between metal sheeting 3 and the sheet metal 2, are threaded the hole on sheet metal 2, the metal sheeting 3, and are by screw 4 that metal sheeting 3, metallic resistance sheet 1, sheet metal 2 is fastening.Metal sheeting 3 links to each other with bonding jumper 5, and wherein sheet metal 2 and bonding jumper 5 are fixed on the insulator 8.The metallic resistance sheet can adopt iron-carbon alloy, iron-nickel alloy or pure iron etc.Thermopair 9 is set on sensor, is used to measure metallic resistance sheet environment temperature.
Working sensor principle: sensor inserted in the carburizing atmosphere to be measured keep certain hour, the carbon content of resistor disc reaches balance (equating) with the atmosphere carbon potential, on lead 6 during by certain electric current I, by measuring the voltage U at metallic resistance sheet two ends, calculate the resistance value R=U/I of metallic resistance sheet, this resistance R is a temperature T, the carbon content C of metallic resistance sheet, the function of original carbon content Co of metallic resistance sheet (making the carbon content of this metallic resistance sheet material therefor) and the resistance value Ro of this metallic resistance sheet (having original carbon content Co) in the time of 0 ℃, be carbon potential (equaling C)=f (Ro, Co, R, T).
Shown in accompanying drawing 5,6, the pure iron that the metallic resistance sheet is thick with 0.2mm, 1.5mm is wide (carbon content can be ignored, i.e. Co=0) is made, and two sheet metals 2 and two bonding jumpers 5 and thermopair 9 are fixed on Al
2O
3On the ceramic skeleton 8, the metallic resistance sheet is cut into certain-length (not be strict with), is pressed in two ends between sheet metal 2 and the metal sheeting 3 and measures its resistance value Ro in the time of 0 ℃, on sensor, adorn a K type thermopair 9, Al
2O
3Ceramic skeleton is contained in the stainless steel earthen-ware pipe 10.Only need when changing metallic resistance sheet 1 screw 4 is unclamped, take off originally, change newly, again screw in compression is got final product.If necessary, when changing the metallic resistance sheet that sheet metal, bonding jumper and metal sheeting removing surface is clean, make them have good electrical conductivity.Changed and at first to measure the resistance value Ro of metallic resistance sheet in the time of 0 ℃ behind the new metallic resistance sheet and could use, in use must not become flexible screw 4, influenced measuring accuracy in order to avoid resistance value R changes.
Claims (3)
1, a kind ofly measures the sensor that carbon potential is used, feature of the present invention is: the sensor that the present invention proposes is: mainly by a carbon content less than 1.3%, 0.05-0.40mm is thick, 0.4-6mm is wide, 10-300mm is long metallic resistance sheet (1), be connected metallic resistance sheet (1) two ends and be used for the lead (6) that provides working current to it, be connected the lead (7) that metallic resistance sheet two ends are used for measuring by it metallic resistance sheet both end voltage and constitute.
2, the sensor used of measurement carbon potential according to claim 1 is characterized in that: two leads (6) connect an end of metallic resistance sheet (1) respectively by sheet metal (2), constitute the loop that the metallic resistance sheet provides working current; Two leads (7) are connected with an end of metallic resistance sheet (1) by bonding jumper (5), metal sheeting (3) respectively in addition, constitute the loop of measuring metallic resistance sheet both end voltage, wherein, metal sheeting (3) connects sheet metal (2), bonding jumper (5) with metallic resistance sheet (1).
3, the sensor used of measurement carbon potential according to claim 1 is characterized in that: the thermopair (9) that is used to measure temperature is housed on sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011150254A CN1170151C (en) | 2001-06-16 | 2001-06-16 | Sensor for measuring carbon potential and nitrogen potential |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011150254A CN1170151C (en) | 2001-06-16 | 2001-06-16 | Sensor for measuring carbon potential and nitrogen potential |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1392407A CN1392407A (en) | 2003-01-22 |
| CN1170151C true CN1170151C (en) | 2004-10-06 |
Family
ID=4661620
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB011150254A Expired - Fee Related CN1170151C (en) | 2001-06-16 | 2001-06-16 | Sensor for measuring carbon potential and nitrogen potential |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1170151C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100381601C (en) * | 2004-03-04 | 2008-04-16 | 上海交通大学 | Apparatus of dynamic testing controlling for carbon potential of vacuum furnace |
-
2001
- 2001-06-16 CN CNB011150254A patent/CN1170151C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1392407A (en) | 2003-01-22 |
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