CN105509919A - Multi-wire system thermocouple and thermocouple charge accumulation preventing method - Google Patents
Multi-wire system thermocouple and thermocouple charge accumulation preventing method Download PDFInfo
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- CN105509919A CN105509919A CN201510855395.8A CN201510855395A CN105509919A CN 105509919 A CN105509919 A CN 105509919A CN 201510855395 A CN201510855395 A CN 201510855395A CN 105509919 A CN105509919 A CN 105509919A
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- 229910018487 Ni—Cr Inorganic materials 0.000 description 3
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- VNNRSPGTAMTISX-UHFFFAOYSA-N chromium nickel Chemical compound [Cr].[Ni] VNNRSPGTAMTISX-UHFFFAOYSA-N 0.000 description 3
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
- G01K7/04—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples the object to be measured not forming one of the thermoelectric materials
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Abstract
The invention discloses a multi-wire system thermocouple. The multi-wire system thermocouple comprises a plurality of positive thermal electrodes and a plurality of negative thermal electrodes, wherein one of the positive thermal electrodes and one of the negative thermal electrodes work in pairs, and one of the other positive thermal electrodes or the other negative thermal electrodes is selected to be grounded, and the rest of thermal electrodes are suspended; one end of each of the positive thermal electrodes and the negative thermal electrodes is connected together; and the thermocouple also comprises a shock absorber and a discharge comb which sleeve a thermocouple temperature measuring rod. According to the multi-wire system thermocouple of the invention, based on timely discharge and charge transfer, charges can be prevented from being accumulated the temperature measuring component to the greatest extent, and at the same time, charge generation quantity can be decreased from the source, and the interference of interference charges on temperature measuring potential can be eliminated from a plurality of channels.
Description
Technical field
Temperature measurement technical field of the present invention, is specifically related to a kind of prevention electric charge accumulation method and multiple-way system thermopair.
Background technology
Thermopair is a kind of temperature-sensing element, its direct measuring tempeature, and temperature signal is converted to thermopower signal.In current industrial environment, a large amount of use thermal response is very fast, the simple thermocouple thermometer of structure.
Thermopair is actually a kind of energy converter, and thermal power transfer is electric energy by it, with the thermoelectrical potential measuring tempeature produced.But under vibration working environment, after thermopair work a period of time, there will be significant thermometric bias phenomenon; Thermoelectrical potential maps temperature course, has occurred certain mistake seemingly.
In order to temperature can accurately be shown, field maintenance person has to change in time thermometric deviation thermopair.After this phenomenon frequently occurs, both affect production efficiency, also increase maintenance workload.
, have collected after producing thermometric deviation for this reason, be replaced the waste and old thermopair got off, in laboratory, sample is resolved by a laboratory, try hard to find out the wrong mechanism caused a deviation.
Table 1 waste and old thermopair sample analysis result table
| Thermopair user | Collect quantity | Test performance is excellent | Test performance is poor | Poor performance reason | Thermometric form |
| A | 4 | 3 | 1 | Broken string | Thermopair K |
| B | 10 | 10 | Thermopair K | ||
| C | 1 | 1 | Thermopair K |
From sample analysis result, verify 3 reasons:
1, analyze from applied environment, thermocouple temperature measurement is as mature technology, and performance is always excellent, but in vibration working environment, then generally occurs thermometric bias phenomenon, shows to have correlativity between vibration operating mode and deviation.
2, there is thermometric bias phenomenon in thermopair, after being mainly manifested in thermopair work a period of time, and Temperature displaying value: 1. can significantly higher than actual temperature value, or 2. significantly lower than actual temperature value, and the 3. up and down fluctuation of displays temperature value, these three kinds of situations; Present by extraneous bursty interference phenomenon.
3, from the analysis of experiment analysis result, collect the waste and old thermopair changed, its operating characteristic index major part still excellent (seeing the above table) is resolved in laboratory, even if show to there occurs thermometric bias phenomenon, also can recover voluntarily subsequently, essence not occur damaged.
Further dissection finds, generally for and shorten the thermocouple temperature measurement response time, be made into armored slim type profile especially, thermometric bar external diameter, roughly between ￠ 2 ~ 3.5mm, requires that Sheathed metal housing, middle filling MgO insulation course, inner thermo wires are all very very thin.Thus can regard as elastic body, follow vibration and allow flexing to a certain degree, when stuff MgO insulation course is forced down repeatedly rubbing, easily occur fragility slight crack, reduce gradually, even lose insulating property.
As everyone knows, vibration brings phase mutual friction between object, triboelectric charge can be produced, and friction is present in as between thermo wires and insulation course, between insulation course and armouring housing, between armouring housing and plant equipment, between plant equipment and web member ..., diversity triboelectric charge mixes and is called interference electric charge, along with interference electric charge is availed oneself of the opportunity to get in along MgO insulation course crack one after another, the event disturbing electric charge to be directly superimposed upon on thermocouple temperature measurement element is caused to occur.
In brief, thermocouple thermometer is in vibration operating mode, and be subject to repeatedly extruding insulation layer to engender slight crack on the one hand, vibration also can cause phase mutual friction between object on the other hand, produces interference electric charge; When interference electric charge is released nowhere, increase and after piling up, certainly will electrostatic potential energy be raised; Enough powerful electric potential field is once pass through crack, be applied on thermopair side or bilateral thermode, overlaying influence is caused to thermometric thermoelectrical potential, form signal disturbing source, follow-up secondary Displaying Meter cannot be distinguished again at all, huge detected value deviation disastrous effect will occur.
Summary of the invention
In view of this, an object of the present invention is to provide a kind of multiple-way system thermopair, and two of object of the present invention is to provide a kind of method preventing thermopair electric charge accumulation.
An object of the present invention is achieved through the following technical solutions, a kind of multiple-way system thermopair, comprise multiple hot electrode and multiple negative thermal electrode that one end links together, one of them hot electrode and one of them negative thermal electrode composition work pair, select a ground connection in remaining hot electrode or negative thermal electrode, all the other thermodes are unsettled.
Further, also comprise the shock absorber be sheathed on thermocouple temperature measurement bar, described shock absorber comprises the large cover of the sleeve with openend, has the little cover of sleeve of openend and volute spring, and described volute spring is placed in sleeve cavity, and the little cover of described sleeve and large inner room can slide with flexible.
Further, described volute spring is stranded wire helical spring, and described stranded wire helical spring is twisted by multiply filament and is made into a bulky spring silk, then helically coiling forms.
Further, described thermopair also comprises electric discharge comb, and described electric discharge comb comprises the circular shell be sheathed on thermocouple temperature measurement bar and the spray point be arranged on circular shell.
Two of object of the present invention is achieved through the following technical solutions, a kind of method preventing thermopair electric charge accumulation, the basis of a hot electrode, a negative thermal electrode increases multiple thermode, by one end ground connection of one of them thermode, the Node connectedness of the other end and positive and negative thermode.
Further, thermocouple temperature measurement bar is arranged the shock absorber reducing frictional strength between object in order to absorbing vibrational energy.
Further, thermocouple temperature measurement bar is arranged the electric discharge comb in order to surface charge to be carried out by object distal migration.
Owing to have employed technique scheme, the present invention has following advantage:
In the present invention, by arranging the positive A of multiply, negative B thermode, an inoperative circuit is wherein utilized, to release pole as neutral earthing, whenever set up interference electric charge release path, in time release unbalance loading heap accumulated charge, guarantee that working heat electrode A and B both sides positive and negative charge amount keep balance.
The present invention, by arranging shock absorber, reduces the interference quantity of electric charge that vibration friction is formed; By arranging electric discharge comb, Charger transfer is assembled ground, prevent surface charge from having nowhere to go and flee to be applied on thermode, realize charge migration function (most advanced and sophisticated poly-electricity), discharged to air by tip subsequently, realize electric charge release function (point discharge)
The present invention, by releasing in time and moving electric charge, reaches and takes precautions against electric charge " accumulation " to greatest extent on temperature element, reduces triboelectric charge generating capacity by shock-absorbing simultaneously, eliminates interference electric charge by all kinds of means to the interference of thermometric thermoelectrical potential.
Accompanying drawing explanation
In order to make the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, the present invention is described in further detail, wherein:
Fig. 1 is two-wire system thermopair fundamental diagram;
Fig. 2 is multiple-way system thermopair fundamental diagram;
Fig. 3 is multiple-way system thermopair anti-electric charge interference principle schematic diagram;
Fig. 4 is the structural drawing of multiple-way system thermopair;
Fig. 5 is integral type shock absorber and the structural representation combed that discharges;
Fig. 6 is integral type shock absorber and the decomposing schematic representation combed that discharges;
Fig. 7 is stranded wire helical spring figure.
Embodiment
Below with reference to accompanying drawing, the preferred embodiments of the present invention are described in detail; Should be appreciated that preferred embodiment only in order to the present invention is described, instead of in order to limit the scope of the invention.
As shown in Figure 1, two-wire system thermopair fundamental diagram, thermopair principle of work is based on Sai Beike (seeback) effect, the conductor of two kinds of different materials or semiconductor A and B is welded, when its two ends are interconnected, as long as the temperature at two node places is different, one end temperature is T, is called working end or hot junction, and other end temperature is T0, be called free end (also claiming reference edge) or cold junction, by generation electromotive force in loop.
The direction of this electromotive force is relevant with the material of conductor and the temperature of two contacts with size.The loop of two kinds of conductor compositions is called thermopair, and these two kinds of conductors are called thermode, and the electromotive force of generation is then called thermopower.
Thermopower is made up of two parts electromotive force, and a part is the contact electromotive force of two kinds of conductors, and another part is the thermoelectromotive force of plain conductor.
The size of thermopower in For Thermocouple Circuit, after thermode materials A and B are fixing, namely contact electromotive force is certain, then only with the composition conductor material of thermopair and the temperature correlation of two contacts, and to have nothing to do with the geomery of thermopair.Thermopower is expressed as the difference of function of two contact temperature T and T0.
As shown in Figure 2, multiple-way system thermopair fundamental diagram, based on this, the invention provides a kind of multiple-way system thermopair, comprise multiple hot electrodes (hereinafter referred to as positive A thermo wires or hot electrode A) and multiple negative thermal electrode (hereinafter referred to as negative B thermo wires or negative thermal electrode B) that one end links together, one of them hot electrode and one of them negative thermal electrode composition work pair, select a ground connection in remaining hot electrode or negative thermal electrode, all the other thermodes are unsettled.
In the present embodiment, multiple-way system thermopair has the positive A of multiply, negative B thermo wires, utilizes an inoperative line wherein, to release pole as neutral earthing; Whenever set up interference electric charge release path, in time release unbalance loading heap accumulated charge, guarantee that working heat electrode A and B both sides positive and negative charge amount keep balance.
In implementation process, as adopted two-wire system to vagabond current release path, namely select thermode materials A and B two kinds simultaneously.For K type thermopair hot electrode A (nickel chromium triangle), negative pole B (nisiloy), when two-wire selects material A (nickel chromium triangle), B (nisiloy) to vagabond current release path, first A-A and B-B two homogeneity thermo wires is coupled together respectively, then A-A and B-B welding (welding).
Citing: brand-new multiple-way system K type thermopair, at least have two hot electrode A-A (nickel chromium triangle), two negative thermal electrode B-B (nisiloy) four thermodes, tool is by two temperature elements.Under normal circumstances, wherein a pair A and B thermode forms working heat galvanic couple, remains in a pair A and B thermode one for vagabond current release path, other one naturally unsettled; When there is disconnection fault, breaking remains on unsettled position through rotation, can work on, have the effect of redundancy thermopair after its excess-three thermode adaptation.
As shown in Figure 3, multiple-way system thermopair anti-electric charge interference principle schematic diagram:
Figure a is multiple-way system thermopair wiring diagram, and line I represents high thermoelectrical potential, line II represents low thermoelectrical potential.
Figure b is multiple-way system thermopair equivalent schematic diagram, thermopair as a kind of active sensor, equivalence become anode+, negative pole-and resistance component;
Figure c is thermopair positive pole+side, when invading and harassing by a large amount of positive charge, causes one-sided unbalance loading state, positive current will be had to pass through to vagabond current release path; Now line I high potential there will be and raises instantaneously, releasing and being tending towards normal along with interference electric charge, and line II low potential is undisturbed, does not occur fluctuation.
Figure d when to be thermopair negative pole-side invade and harass by a large amount of positive charge, causes one-sided unbalance loading state, negative current will be had to pass through to vagabond current release path; Line I high potential is undisturbed, does not occur fluctuation, and line II low potential there will be and raises instantaneously, releasing and being tending towards normal along with interference electric charge.
Figure e when to be thermopair positive pole+side invade and harass by outside a large amount of positive and negative alternation electric charge, causes one-sided alternation unbalance loading state, has positive and negative alternating current to pass through to vagabond current release path; Now line I high potential there will be and raises instantaneously, reduces fluctuation, alternately releasing and being tending towards normal along with interference electric charge, and line II low potential is undisturbed, does not occur fluctuation.
Figure f can cause mid point voltage-to-ground not exclusively to go to zero for " not pure land ", and raise or drag down axis electromotive force, and thermopair positive and negative the two poles of the earth electromotive force will follow fluctuation, but all can not affect sense potential difference, namely pure land can not affect the correct reading of temperature detection value.
In sum, configure after vagabond current release path, invade and harass once be subject to electric charge, can restore balance adaptively, reach rapidly the beneficial effect of stable thermocouple temperature measurement electric potential difference.
Induction, multiple-way system thermopair can form arbitrary indexing number, the redundancy thermopair that configures many positive poles and negative pole, have multipair temperature element, and has charge discharging resisting passage.
Multiple-way system thermopair of the present invention works in vibration environment, and thermopair is in vibration operating mode, and be subject to repeatedly extruding insulation layer to engender slight crack on the one hand, vibration also can cause phase mutual friction between object on the other hand, produces interference electric charge.In order to reduce this interference electric charge, the present invention is sheathed shock absorber 3 on the thermocouple temperature measurement bar 1 of thermopair, this shock absorber comprises the large cover of the sleeve with openend 7, has the little cover 5 of the sleeve of openend and volute spring 6, described helical spring one end is arranged at the bottom of the little cover of sleeve, described helical spring another is placed in the bottom of the large cover of sleeve, and the openend of the little cover of described sleeve slidably extend in the large cover of sleeve.
As shown in Figure 7, stranded wire helical spring figure, stranded wire helical spring adopts filament strand to be made into a bulky spring silk, then spiral winding makes stranded wire helical spring; When vibrated and compression with when stretching, due to the phase mutual friction in deformation process between filament, consume portion of energy, i.e. energy dissipation spring can not be recovered completely, there is the effect of vibration damping accordingly.When there is vibration, one end of spring remains in the little cover of sleeve, and the other end remains in the large cover of sleeve.In sliding process, the little cover of sleeve remains in the large cover of sleeve always.
Relative to normal spiral spring directly with for a metal crin helically coiling, its compression and drawing process almost noenergy loss, recover completely immediately, be usually referred to as energy-stored spring.
As also shown in e.g. figs. 4-7, single stranded wire helical spring approximately can consume the energy of about 30%, be equipped with sleeve combination mode, extrusion friction between existing filament, there is again sliding friction between spring and sleeve wall, also have sleeve and the mutual friction of slip expansion section phase, consumption vibrational energy as much as possible, reach that extraneous strong wind brash formula is mad shakes, the shock-proof effect that the local environment residing for thermopair is servo-actuated in a gentle and mild way.
Shock absorber, keeps apart extraneous vibration source and thermopair, slows down or blocks shock load bang path, playing certain shock-proof effect, and can reduce the generation of triboelectric charge.
Further, described thermopair also comprises electric discharge comb 8, and described electric discharge comb comprises the circular shell be sheathed on thermocouple temperature measurement bar and the spray point 9 be arranged on circular shell, and one end of described circular shell is connected with the end of the openend away from the large cover of sleeve.
Electric discharge comb utilizes most advanced and sophisticated poly-electrical effect, on thermopair shell, arranges prong battle array, the collecting current type electric discharge comb of formation, and namely on whole thermometric bar shell, plug prong, shape is as mace; Due to by space constraints, wolf's fang circle can be reduced into, be put into lead-in wire position, thermopair rear end with time shift; By thermopair Sheathed metal electric conductivity, guide electric charge to temperature element far-end, play the positive role of migration surface disturbance electric charge stowed location.
Utilize discharge principle, after tip being assembled a large amount of electric charge, prong possesses enough energies of position and discharges to ambient air, just as lightning rod working method simultaneously.
As shown in figures 4-6, electric discharge comb outside surface is furnished with ring-type or the strips of conductive component of prong, and the inside surface of its relative smooth is done conducting with by safeguard and connected by screw thread, screw or welding, the mode such as bonding, fixes.
In invention, the interference electric charge that friction is formed, be first transferred to far-end collecting current type electric discharge comb and above assemble, prevention surface charge is had nowhere to go, and flees to be applied on thermo wires, realizes charge migration function (most advanced and sophisticated poly-electric); Being discharged to flowing through air by most advanced and sophisticated subsequently, realizing electric charge release (point discharge).
As shown in Figure 5, integral type shock absorber combs structure with electric discharge, in order to save space further, facilitates manufacture and installation, and by electric discharge comb and shock absorber, combination is made into integral type shock absorber and combs structure with electric discharge.
Further, described thermopair also comprises cutting ferrule 2, and described cutting ferrule is slidably sheathed on thermocouple temperature measurement bar, described thermocouple temperature measurement bar is provided with the locating device preventing cutting ferrule thermoelectric couple thermometric boom end from moving.
The concrete implementation step of the present invention, introduce neutral earthing release pole (current loop), electric discharge comb, shock absorber, be all carry out custom fit in thermopair Making programme, nurse one's health without the need to scene, therefore both facilitate new construction, upgrading project is replaced in more convenient transformation.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (7)
1. a multiple-way system thermopair, it is characterized in that: comprise multiple hot electrode and multiple negative thermal electrode that one end links together, one of them hot electrode and one of them negative thermal electrode composition work pair, select a ground connection in remaining hot electrode or negative thermal electrode, all the other thermodes are unsettled.
2. multiple-way system thermopair according to claim 1, it is characterized in that: also comprise the shock absorber be sheathed on thermocouple temperature measurement bar, described shock absorber comprises the large cover of the sleeve with openend, has the little cover of sleeve of openend and volute spring, described volute spring is placed in sleeve cavity, and the little cover of described sleeve and large inner room can slide with flexible.
3. multiple-way system thermopair according to claim 2, is characterized in that: described volute spring is stranded wire helical spring, and described stranded wire helical spring is twisted by multiply filament and is made into a bulky spring silk, then helically coiling forms.
4. multiple-way system thermopair according to claim 1 and 2, is characterized in that: described thermopair also comprises electric discharge comb, and described electric discharge comb comprises the circular shell be sheathed on thermocouple temperature measurement bar and the spray point be arranged on circular shell.
5. prevent a method for thermopair electric charge accumulation, it is characterized in that: on the basis of a hot electrode, a negative thermal electrode, increase multiple thermode, by one end ground connection of one of them thermode, the Node connectedness of the other end and positive and negative thermode.
6. the method preventing thermopair electric charge accumulation according to claim 5, is characterized in that: on thermocouple temperature measurement bar, arrange the shock absorber reducing frictional strength between object in order to absorbing vibrational energy.
7. the method preventing thermopair electric charge accumulation according to claim 5 or 6, is characterized in that: on thermocouple temperature measurement bar, arrange the electric discharge comb in order to surface charge to be carried out by object distal migration.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108168438A (en) * | 2017-12-28 | 2018-06-15 | 长春禹衡光学有限公司 | A kind of closed grating |
| CN113465758A (en) * | 2021-06-21 | 2021-10-01 | 中国原子能科学研究院 | Temperature measuring device and temperature measuring system |
| CN113970379A (en) * | 2021-10-22 | 2022-01-25 | 湖南大学 | New Thermocouple for Non-Uniform Temperature Field Measurements |
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| US4341992A (en) * | 1980-01-21 | 1982-07-27 | Control Electronics Co., Inc. | Conductive probe cover |
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| CN202974481U (en) * | 2012-12-12 | 2013-06-05 | 重庆材料研究院 | Temperature sensing apparatus for wide-range temperature detection of diesel locomotive |
| CN203352935U (en) * | 2013-05-21 | 2013-12-18 | 东莞市盈聚电子有限公司 | A Low Electromagnetic Interference Switching Power Supply Printed Circuit Board |
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| CN108168438A (en) * | 2017-12-28 | 2018-06-15 | 长春禹衡光学有限公司 | A kind of closed grating |
| CN108168438B (en) * | 2017-12-28 | 2020-02-14 | 长春禹衡光学有限公司 | Closed grating |
| CN113465758A (en) * | 2021-06-21 | 2021-10-01 | 中国原子能科学研究院 | Temperature measuring device and temperature measuring system |
| CN113970379A (en) * | 2021-10-22 | 2022-01-25 | 湖南大学 | New Thermocouple for Non-Uniform Temperature Field Measurements |
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