CN101221074A - Linear butt welding thermocouple and measurement amending method - Google Patents
Linear butt welding thermocouple and measurement amending method Download PDFInfo
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- CN101221074A CN101221074A CNA200710063370XA CN200710063370A CN101221074A CN 101221074 A CN101221074 A CN 101221074A CN A200710063370X A CNA200710063370X A CN A200710063370XA CN 200710063370 A CN200710063370 A CN 200710063370A CN 101221074 A CN101221074 A CN 101221074A
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- thermopair
- thermo wires
- thermocouple
- straight line
- butt welding
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Abstract
The invention relates to a line butt-welding thermocouple and a measuring-correcting method. The thermocouple consists of a butt-welding thermocouple wire, thermocouple wire joints, a thin steel wire, a supporting block, fixing bolts, springs and a lead. Two thin steel tubes are fixed on the supporting block through the fixing bolts; wherein, one steel tube acts as a fixing arm and the position of the steel tube keeps unchanged when measuring; the other steel tube acts as a movable arm which can move freely; the upper ends of the fixing arm and the movable arm are respectively provided with the thermocouple wire joints; one end of the thermocouple wire joint is connected with the lead passing through the thin steel tube; two ends of the thermocouple wire are respectively fixed on the thermocouple wire joints by thin bolts; the tail ends of the fixing arm and the movable arm are sheathed with the springs; the measuring error caused by the heat expansion of the thermocouple wire can be removed by the adjustment on the position of the movable arm through the springs. By using the thermocouple to directly measure a flame temperature field, big heat conducting and radiation errors exist; while using the measuring method and a computer correcting procedure of the invention to correct the measuring result of the line butt-welding thermocouple can maximally reduce the error when in the mixing process.
Description
Technical field
The present invention relates to measure the flame temperature technical field, is a kind of straight line butt welding thermopair and measurement modification method that is used to measure flame temperature field, can accurately measure flame temperature field by straight line butt welding thermopair of the present invention and measurement modification method thereof.
Background technology
Can run into following problem during with the thermocouple measurement flame temperature: 1) radiation error, because the temperature of flame is very high, the radiation error of thermopair must be revised.2) conduction error, in most of thermometric occasion, as long as thermopair is installed rationally, its conduction error just can be ignored, but very big owing to thermograde in flame, conduction error sometimes can be up to 400 ℃.Therefore also must revise.And as contact type measurement, thermopair can cause interference to the flame flow field in the thermometric process.3) the thermocouple wire expanded by heating is elongated, makes thermo wires at the effect lower swing of air-flow, causes temperature measurement error.
At the characteristics of above measurement flame, the invention provides a kind of straight line butt welding thermopair and measure modification method.
Summary of the invention
The object of the present invention is to provide a kind of straight line butt welding thermopair, adopt special version so that the flame influence on flow field is reduced to minimum, and provide a kind of modification method of measuring to revise to the radiation and the conduction error of thermopair, to obtain flame temperature value accurately.
For achieving the above object, technical solution of the present invention is: a kind of straight line butt welding thermopair, comprise thermo wires, thermo wires joint, fine steel tube, back-up block, set bolt, spring and lead, wherein,
Nearly end of two fine steel tubes is fixed on the back-up block by set bolt, and wherein a steel pipe is as fixed arm, and its position remains unchanged when measuring, and another root steel pipe can be free movable as moveable arm;
The other end of fixed arm and moveable arm is equipped with the thermo wires joint respectively, and an end of two thermo wires joints links to each other with the lead that passes two fine steel tubes;
The two ends of thermo wires respectively by thin screw retention on two thermo wires joints;
One end of fixed arm and moveable arm is with spring, by spring the level of stretch of thermo wires is controlled in the adjusting of moveable arm position, makes thermo wires remain the straight line extended state, prevents vibration.
Described straight line butt welding thermopair, its thermo wires are to use welding technology is welded.
Described straight line butt welding thermopair, the error that the thermal expansion that its pretightning force by spring is eliminated thermo wires in the thermocouple temperature measurement process causes.
Described straight line butt welding thermopair, it has only thin thermo wires to pass flame owing in the thermometric process, and is therefore very little to the influence of flame.
Described straight line butt welding thermopair, during thermometric, the point for measuring temperature of thermopair little by little moves to the right-hand member of flame by the left end of the xsect of flame, records a series of temperature value.
Described straight line butt welding thermopair to its measurement result, is used the discretize solving method of the one dimension energy-balance equation of thermopair, carries out the correction of heat conduction and radiation error.
The present invention is by obtaining revised temperature value to finding the solution of energy-balance equation, owing to considered conductive heat loss, heat exchange loss and the radiation loss of thermopair in the energy-balance equation, therefore revised temperature value has remedied the error loss, more approaches actual value.
Description of drawings
Fig. 1 is the structural representation of straight line butt welding thermopair of the present invention;
Fig. 2 is a mathematical model synoptic diagram of the present invention.
Embodiment
Straight line butt welding thermopair provided by the invention comprises butt welding thermo wires, thermo wires joint, fine steel tube, back-up block, set bolt, spring and lead, wherein:
Two fine steel tubes are fixed on the back-up block by set bolt, and wherein a steel pipe is as fixed arm, and its position remains unchanged when measuring, and another root steel pipe can be free movable as moveable arm;
The upper end of fixed arm and moveable arm is equipped with the thermo wires joint respectively, and thermo wires joint one end links to each other with the lead that passes fine steel tube;
The two ends of thermo wires respectively by thin screw retention on the thermo wires joint;
The end of fixed arm and moveable arm is with spring, by spring the level of stretch of thermo wires is controlled in the adjusting of moveable arm position, makes that thermo wires remains the straight line extended state in the measuring process, prevents vibration;
Thermo wires moves in the flame flow field in the measuring process, has only thermo wires contact with the flow field, because the thermo wires thinner diameter of employing usually, so the thermopair of said structure form can be so that thermopair reduces to minimum to the interference in flame flow field.
Because thermopair exists heat conduction and radiation heat loss in measuring process, therefore record data and there is certain error in the true temperature value.In order to reduce and to eliminate this error, the present invention also provides corresponding temperature revision program.
Thermopair satisfies following one dimension energy-balance equation in measuring process:
In the formula, A
1---the cross-sectional area of thermopair;
A
2---the surface area of thermopair;
t
g---the temperature of thermopair ambient gas;
The thermodynamic temperature of T---thermopair;
T
w---the thermodynamic temperature of environment;
The coefficient of heat conductivity of λ---thermopair;
The surface coefficient of heat transfer of h---thermopair;
The emissivity of ε---thermopair;
σ---blackbody radiation constant.
Accompanying drawing is structural representation of the present invention and mathematical model synoptic diagram.With reference to Fig. 1 as can be known, two fine steel tubes are fixed on the back-up block 6 by set bolt 7, and wherein a steel pipe is as fixed arm 5, and its position remains unchanged when measuring, and another root steel pipe can be free movable as moveable arm 4; The end that the upper end of fixed arm 5 and moveable arm 4 is equipped with thermo wires joint 3, two thermo wires joints 3 respectively respectively links to each other with the lead 9 that passes two fine steel tubes; The two ends of thermo wires 2 respectively by thin screw retention on two thermo wires joints 3; The end of fixed arm 5 and moveable arm 4 is with spring 8, controls the level of stretch of thermo wires 2 in measuring process by the automatic adjusting of 8 pairs of moveable arm 4 positions of spring, prevents that vibration from appearring in thermo wires 2 in air-flow, and 1 is the butt welding point for measuring temperature of thermopair.
During thermometric, the point for measuring temperature of thermopair little by little moves to the other end of flame from an end of flame, records a series of flame temperature.The temperature value that records carries out heat conduction and radiation error correction by revision program.According to model synoptic diagram shown in Figure 2, at first the one dimension energy-balance equation with thermopair carries out discretize, and the temperature value that thermopair is recorded is as T then
gInitial value bring the discrete equation group into and find the solution T, the result who calculates is re-used as T
gBring system of equations into and iterate, up to satisfying certain condition of convergence.The temperature value that calculates by said method is the correction temperature value of measured medium, owing to carried out the compensation of heat conduction and radiation loss, its numerical value has reflected the true temperature value of flame very accurately.
Claims (6)
1. a straight line butt welding thermopair comprises thermo wires, thermo wires joint, fine steel tube, back-up block, set bolt, spring and lead, it is characterized in that: wherein,
Nearly end of two fine steel tubes is fixed on the back-up block by set bolt, and wherein a steel pipe is as fixed arm, and its position remains unchanged when measuring, and another root steel pipe can be free movable as moveable arm;
The other end of fixed arm and moveable arm is equipped with the thermo wires joint respectively, and an end of two thermo wires joints links to each other with the lead that passes two fine steel tubes;
The two ends of thermo wires respectively by thin screw retention on two thermo wires joints;
One end of fixed arm and moveable arm is with spring, by spring the level of stretch of thermo wires is controlled in the adjusting of moveable arm position, makes thermo wires remain the straight line extended state, prevents vibration.
2. straight line butt welding thermopair as claimed in claim 1 is characterized in that: its thermo wires is to use welding technology is welded.
3. straight line butt welding thermopair as claimed in claim 1 is characterized in that: eliminate the error that the thermal expansion of thermo wires in the thermocouple temperature measurement process causes by the pretightning force of spring.
4. straight line butt welding thermopair as claimed in claim 1 is characterized in that: owing to have only thin thermo wires to pass flame in the thermometric process, and therefore very little to the influence of flame.
5. the measurement modification method of a straight line butt welding thermopair as claimed in claim 1, it is characterized in that, during thermometric, on each xsect of flame, the point for measuring temperature of thermopair is little by little moved to right-hand member by the left end of flame, thereby record the series of temperature value on this cross section; Carry out the correction of heat conduction and radiation error then with the one dimension energy-balance equation.
6. measurement modification method as claimed in claim 5 is characterized in that, described one dimension energy-balance equation is
, wherein, A
1---the cross-sectional area of thermopair; A
2---the surface area of thermopair; t
g---the temperature of thermopair ambient gas; The thermodynamic temperature of T---thermopair; T
w---the thermodynamic temperature of environment; The coefficient of heat conductivity of λ---thermopair; The surface coefficient of heat transfer of h---thermopair; The emissivity of ε---thermopair; σ---blackbody radiation constant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200710063370XA CN100565143C (en) | 2007-01-10 | 2007-01-10 | Straight line butt welding thermopair and measurement modification method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200710063370XA CN100565143C (en) | 2007-01-10 | 2007-01-10 | Straight line butt welding thermopair and measurement modification method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101221074A true CN101221074A (en) | 2008-07-16 |
| CN100565143C CN100565143C (en) | 2009-12-02 |
Family
ID=39631053
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB200710063370XA Expired - Fee Related CN100565143C (en) | 2007-01-10 | 2007-01-10 | Straight line butt welding thermopair and measurement modification method |
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| CN (1) | CN100565143C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111189552A (en) * | 2020-01-09 | 2020-05-22 | 中国石油大学(华东) | Methane hydrate flame temperature testing device and temperature measurement correction method |
| CN112525366A (en) * | 2020-11-27 | 2021-03-19 | 中国航发四川燃气涡轮研究院 | Air suction type pluggable thermocouple probe for engine air inlet total temperature dynamic distortion test |
| CN114034403A (en) * | 2021-10-22 | 2022-02-11 | 北京航空航天大学 | Flame temperature measuring device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1379546A (en) * | 1971-02-08 | 1975-01-02 | Johnson Matthey Co Ltd | Thermocouple compensating leads |
| IT1319453B1 (en) * | 2000-06-09 | 2003-10-10 | Dario Felisario | ELECTROTHERMIC DEVICE FOR THE IGNITION AND DETECTION OF FLAMES IN GAS BURNERS. |
-
2007
- 2007-01-10 CN CNB200710063370XA patent/CN100565143C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111189552A (en) * | 2020-01-09 | 2020-05-22 | 中国石油大学(华东) | Methane hydrate flame temperature testing device and temperature measurement correction method |
| CN111189552B (en) * | 2020-01-09 | 2021-09-14 | 中国石油大学(华东) | Methane hydrate flame temperature testing device and temperature measurement correction method |
| CN112525366A (en) * | 2020-11-27 | 2021-03-19 | 中国航发四川燃气涡轮研究院 | Air suction type pluggable thermocouple probe for engine air inlet total temperature dynamic distortion test |
| CN112525366B (en) * | 2020-11-27 | 2023-03-14 | 中国航发四川燃气涡轮研究院 | Air suction type pluggable thermocouple probe for engine air inlet total temperature dynamic distortion test |
| CN114034403A (en) * | 2021-10-22 | 2022-02-11 | 北京航空航天大学 | Flame temperature measuring device |
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| Publication number | Publication date |
|---|---|
| CN100565143C (en) | 2009-12-02 |
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