CN101576417B - Protective tube for thermocouple and preparation method thereof - Google Patents
Protective tube for thermocouple and preparation method thereof Download PDFInfo
- Publication number
- CN101576417B CN101576417B CN2008101609793A CN200810160979A CN101576417B CN 101576417 B CN101576417 B CN 101576417B CN 2008101609793 A CN2008101609793 A CN 2008101609793A CN 200810160979 A CN200810160979 A CN 200810160979A CN 101576417 B CN101576417 B CN 101576417B
- Authority
- CN
- China
- Prior art keywords
- tube
- thermocouple
- protective tube
- lead
- protecting
- 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.)
- Expired - Fee Related
Links
Images
Landscapes
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The invention relates to a protective tube for a thermocouple and a preparation method thereof. A conducting wire is buried at a position with a preset wall thickness in the pipe wall of the protective tube for the thermocouple, and the incoming and outgoing line ends of the wire outgo from an opening end. Therefore, a complete detection circuit can detected a worn wire when the pipe wall of the protective tube for the thermocouple is worn to a preset position but not worn out and the thermocouple is about to but not be worn, so the predictability of the wear of the protective tube for the thermocouple is improved and operators are reminded in time to handle the wear.
Description
Technical field
The present invention relates to a kind of protective tube for thermocouple; When relating in particular to a kind of temperature that is applicable to the medium that in measuring channel high temperature and high speed flows; Improve the abrasion resistant thermocouple protective tube for thermocouple in serviceable life, simultaneously, the invention still further relates to a kind of preparation method of this protection tube.
Background technology
So-called abrasion resistant thermocouple; Just protecting tube adopts antifriction alloy technology or structural ceramics technology; Improve the wearing quality of protecting tube, thereby improve the serviceable life of thermopair, the thermopair that has the special material protection tube so just is abrasion resistant thermocouple.Generally speaking, be 2-3 times of antifriction alloy sleeve pipe the serviceable life of structural ceramics sleeve pipe, and will decide concrete serviceable life according to practical condition, is example with the wind in fuel-burning power plant, and can reach about 1 year the serviceable life of structural ceramics sleeve pipe.
The ultimate principle of thermocouple temperature measurement is: the homogeneous conductor of two kinds of different components is formed the closed-loop path, when there is temperature difference in two ends, just has electric current in the loop and passes through, and just exist electromotive force---thermoelectric force between the two ends this moment.The homogeneous conductor of two kinds of different components is a thermode, and the higher end of temperature is the working end, and the end that temperature is lower is a free end, and free end is under certain stationary temperature usually.According to thermopower and functional relationship of temperature, process thermocouple indexing table; Dividing kilsyth basalt is to obtain under the condition of free end temperature in the time of 0 ℃, and different thermopairs has different branch kilsyth basalts, and commonly used have a K type, T type, J type, N type, S type, E type calibration number.When in the thermopair loop, inserting the third metal material, as long as the temperature of two contacts of this material is identical, the thermoelectrical potential that thermopair produced will remain unchanged, and promptly not receive the third metal to insert the influence in the loop.Therefore, when thermocouple temperature measurement, can insert measurement instrument, record thermopower after, promptly know the temperature of measured medium.
In commercial production, need the temperature of high temperature and high speed flow media in the measuring channel sometimes, need to measure its temperature with thermopair.But for a long time, regardless of being with the ordinary hot galvanic couple or using abrasion resistant thermocouple that wear problem all can not get effective solution, has only passively and changes.Improved the production cost of enterprise on the one hand, changing thermopair on the other hand is passive behavior, returns safety and production and has brought certain hidden danger, also is unfavorable for the overall arrangement that the staff works.On the market various abrasion resistant thermocouples are arranged now, the invention of various abrasion resistant thermocouples is also arranged simultaneously, but also the wearing and tearing of abrasion resistant thermocouple are not detected the device of protection at present.
No matter be which kind of abrasion resistant thermocouple, in case protecting tube is ground away or corroded in actual production process, the thermopair core also just damages, and whole thermopair also damages thereupon, has only the new thermopair of replacing, has so just improved cost greatly.If consider that from the safety in production angle possible loss can be bigger.
Summary of the invention
Technical matters to be solved by this invention provides a kind of protective tube for thermocouple, so that the abrasion condition of protective tube for thermocouple is detected, is convenient to carry out early warning during to the precalculated position in the degree of wear.
The present invention also aims to provide a kind of preparation method of protecting tube.
To achieve these goals, technical scheme of the present invention has adopted a kind of protective tube for thermocouple, and structural feature is the setting wall thickness place in the tube wall of protective tube for thermocouple, is embedded with lead, and the end of incoming cables of lead and leading-out terminal all bring out line from opening one.
Described lead spiral is provided with, and it is at least one circle that the number of turns is set.
Described lead at axis direction with single two-wire setting.
Described lead is divided into two sections, and one section is axially disposed within the sidewall, and the other end is arranged in another sidewall, and all with single two-wire setting, the end of incoming cables at two ends and leading-out terminal all bring out line from opening one.
Described lead by a side inwall through protection tube bottom around to the opposite side inwall.
Simultaneously, technical scheme of the present invention has also adopted a kind of preparation method of protecting tube, may further comprise the steps: make earlier the inside and outside layer of protecting tube respectively, the inside and outside layer of said protecting tube is processed by silicon nitride; Then coil shaped is reinforced on the thermocouple protection inner tube layer with glue; Integral body is put into the protection tube skin again; Between this inside and outside layer of thermocouple protection certain clearance is arranged like this; This gap is filled with corresponding structure ceramic powder slurry, with the whole calcining of protecting tube, ectonexine is become one at last.
Described calcining heat is 400 ℃-700 ℃.
Because the setting wall thickness place in the tube wall of protective tube for thermocouple is embedded with lead; The end of incoming cables of lead and leading-out terminal bring out line from opening one, make that the tube wall at protective tube for thermocouple is worn down to desired location, before the tube wall of protective tube for thermocouple is ground, thermopair will but when also not having wear damage; Lead is rubbed; Supporting testing circuit can detect in advance, improves the foresight of protecting tube wearing and tearing, and in time the prompting personnel handle; When the thermopair wear signal occurs, just remind personnel's thermopair will wear damage, in fact thermopair does not damage, and it is still very normal to work, so only need change protecting tube, need not change whole thermopair, can greatly reduce cost like this; On the other hand, when the staff obtains cue, according to the actual conditions of producing; The protecting tube that can temporarily need not more renew can be with thermopair bolt precession half cycle again, i.e. Rotate 180 °; Make protecting tube wear surface (being the windward side) become the back side (promptly not wear surface), the back side becomes the windward side, thereby can guarantee the normal operation of thermopair; At this moment, if use both sides all to have the protection tube of lead, can also utilize the intact lead of another root to continue to play the monitoring effect.The advantage that the present invention had is that production cost is low, and long service life improves the safety in production safety coefficient, alleviates staff's labor capacity.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is the structural representation of one embodiment of the present invention;
Fig. 3 is that the B of Fig. 2 is to view;
Fig. 4 is the A-A cut-open view of Fig. 2;
Fig. 5 is the structural representation of another embodiment of the invention;
Fig. 6 is the C-C cut-open view of Fig. 5;
Fig. 7 is the structural representation of the 4th kind of embodiment of the present invention;
Fig. 8 is the structural representation of the testing circuit of invention.
Embodiment
(1) material:
Material can adopt structural ceramics silicon nitride (Si
3N
4) material.
The structural ceramics tool with high temperature resistantly, wear-resisting, corrosion-resistant, anti-wash away, anti-oxidant, excellent properties such as creep is little under anti-ablation, the high temperature.Structural ceramics can be divided into oxide (Al by chemical composition
2O
3, MgO, ZrO
2Deng) ceramic, nitride (Si
3N
4, AlN etc.) pottery, carbonide (SiC, B
4C etc.).Utilize silicon nitride (Si
3N
4) thermotolerance, the chemical stability of material, the performance of refractory metal corrosion, aspect metallurgical industry as casting vessel, combustion boat, crucible, evaporating dish and protecting tube etc.The intensity of silicon nitride is very high; Hardness is also very high, is one of the hardest in the world material, and its temperature tolerance is better; Intensity can be maintained to 1200 ℃ of high temperature and not descend; Until 1900 ℃ just can be decomposed, and it has surprising resistance to chemical corrosion, is again a kind of high performance electrically insulating material simultaneously.Adopt the various silicon nitride ceramics overall performances of microwave firing explained hereafter to reach advanced world standards.
(2) shape of protecting tube:
The diameter of abrasion resistant thermocouple protective tubes and length can be decided according to actual conditions, and the shape and the size of abrasion resistant thermocouple protective tubes commonly used are seen Fig. 1.Among the figure, a kind of protective tube for thermocouple of the present invention, structural feature is the setting wall thickness place in the tube wall of existing protective tube for thermocouple 1, is embedded with spiral conducting line 2, the spiral conducting line number of turns is at least one circle.Consider the heat expansion property of coil, can select copper cash φ 0.1-0.5 for use, coil turn density 0.5 circle-2 circle/centimetre.The end of incoming cables of lead and leading-out terminal 3 bring out line from opening one.Spiral conducting line 2 is at the discontiguous coil of single two-wire turn-to-turn apart from abrasion resistant thermocouple protective tubes internal face 0.3mm-1mm place.
Like Fig. 2, Fig. 3, shown in Figure 4, be lead in the axis direction setting with the difference of embodiment 1, functional section 4 is arranged on sets the wall thickness place, and the outside wall surface of lead correspondence position is provided with the lead location sign.
Embodiment 3
Like Fig. 5, shown in Figure 6, be that with the difference of embodiment 2 described lead is divided into two sections, one section 5 is axially disposed within the sidewall 6, and another section 7 is arranged in another sidewall 8, and the end of incoming cables of two leads and leading-out terminal all bring out line from opening one.The outside wall surface of lead correspondence position is provided with the lead location sign.
As shown in Figure 7, the lead 9 in the present embodiment by a side inwall through protection tube 1 bottom around to the opposite side inwall.
In the concrete use, lead is as shown in Figure 8 with connecting of protective device circuit diagram into and out of line end:
The Ui that two leading-out terminals of lead are connected on circuit diagram respectively reaches+V
DDEnd, not polarity.
This circuit diagram is laser diode load of typical C MOS phase inverter band.
1. when Ui=0V, VN ends, the VP conducting.Output voltage U o=V
DD=3V.That is: coil is an off state, Ui=0V, and at this moment protecting tube will wear damage, and this moment, coil rubbed.Like Fig. 8 b state.
2. when Ui=3V, the VN conducting, VP ends.Output voltage U o=0V.That is: coil is a channel status, Ui=3V, and protecting tube is in serviceable condition.Like Fig. 8 c state.
3. resistance R in the circuit
1Be current-limiting resistance, resistance R
2Constitute resistance-capacitance protection with capacitor C, they play the effect of protection laser diode LD jointly.
4. the electric current of input end approximates zero in the CMOS inverter circuit, and coil only plays the path effect, and does not have electric current, so also can not produce magnetic field, also just can not influence the temperature measurement signal of thermopair.
The characteristics of CMOS phase inverter:
Under state A situation, for being in static CMOS phase inverter, then because the representative value of quiescent dissipation that reverse leakage current causes is 1～2nW (1nW=10
-9W).Quiescent dissipation approximates zero, so power supply can be kept for a long time under above-mentioned c state status.
Protection tube shown in Figure 1 is with after testing circuit is connected, when the staff obtains column of red light cue that red laser diode launches, according to the actual conditions of producing; The protecting tube that can temporarily need not more renew is only used thermopair bolt precession half cycle again, i.e. Rotate 180 °; Make protecting tube wear surface (being the windward side) become the back side (promptly not wear surface); The back side becomes the windward side, thereby can guarantee the normal operation of thermopair, but this time can not detect the signal that protecting tube weares and teares once more; Should be according to the actual conditions of producing, shift to an earlier date a period of time with practical experience and change protecting tube.From another angle, be equivalent to launch a subsequent use thermopair like this.
The preparation method of protecting tube is specially: make the inside and outside layer of protecting tube at first respectively; Then coil shaped is reinforced on the thermocouple protection inner tube layer with glue, integral body is put into the protection tube skin again, between this inside and outside layer of thermocouple protection certain clearance is arranged like this; This gap is filled with corresponding structure ceramic powder slurry; With 400 ℃-700 ℃ of the whole calcinings of protecting tube, present embodiment is preferably 500 ℃, and ectonexine is become one at last.
Claims (6)
1. protective tube for thermocouple; It is characterized in that; Setting wall thickness place in the tube wall of protective tube for thermocouple is embedded with to be used for when the tube wall of protecting tube is worn down to desired location, being rubbed and thinks that supporting testing circuit provides the lead of galvanic couple wear signal, and described lead spiral is provided with; It is at least one circle that the number of turns is set, and the end of incoming cables of lead and leading-out terminal bring out line from opening one.
2. protective tube for thermocouple according to claim 1 is characterized in that, described lead at axis direction with single two-wire setting.
3. protective tube for thermocouple according to claim 1 is characterized in that, described lead is divided into two sections; One section is axially disposed within the sidewall; Another section is arranged in another sidewall, and all with single two-wire setting, two sections end of incoming cables and leading-out terminal all bring out line from opening one.
4. protective tube for thermocouple according to claim 1 is characterized in that: described lead by a side inwall through protection tube bottom around to the opposite side inwall.
5. one kind prepares the method for protective tube for thermocouple according to claim 1, it is characterized in that: may further comprise the steps: make earlier the inside and outside layer of protecting tube respectively, the inside and outside layer of said protecting tube is processed by silicon nitride; Then coil shaped is reinforced on the thermocouple protection inner tube layer with glue; Integral body is put into the protection tube skin again; Between the inside and outside layer of protecting tube certain clearance is arranged like this; This gap is filled with corresponding structure ceramic powder slurry, with the whole calcining of protecting tube, ectonexine is become one at last.
6. protective tube for thermocouple preparation method according to claim 5 is characterized in that: described calcining heat is 400 ℃-700 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101609793A CN101576417B (en) | 2008-05-09 | 2008-09-18 | Protective tube for thermocouple and preparation method thereof |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810049717.X | 2008-05-09 | ||
| CN200810049717 | 2008-05-09 | ||
| CN2008101609793A CN101576417B (en) | 2008-05-09 | 2008-09-18 | Protective tube for thermocouple and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101576417A CN101576417A (en) | 2009-11-11 |
| CN101576417B true CN101576417B (en) | 2012-06-27 |
Family
ID=41271411
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008101609793A Expired - Fee Related CN101576417B (en) | 2008-05-09 | 2008-09-18 | Protective tube for thermocouple and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101576417B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5810065B2 (en) | 2012-11-15 | 2015-11-11 | 株式会社神戸製鋼所 | Protection tube deterioration detection device and method |
| CN103954373A (en) * | 2014-04-22 | 2014-07-30 | 上海东富龙拓溥科技有限公司 | Faucet special for aseptic tank bottom thermometer |
| CN105316644A (en) * | 2015-11-20 | 2016-02-10 | 苏州赛森电子科技有限公司 | Thermocouple protecting device for semiconductor evaporation table |
| CN108303188A (en) * | 2018-02-01 | 2018-07-20 | 辽宁伊菲科技股份有限公司 | A kind of manufacturing method of silicon nitride secondary protection tube |
| CN109752108A (en) * | 2019-02-14 | 2019-05-14 | 安徽天康(集团)股份有限公司 | A kind of replaceable high life thermocouple |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86104974A (en) * | 1985-08-06 | 1987-02-04 | 底古萨有限公司 | Be used to measure the thermoelectric element of temperature in the vacuum drying oven |
| US5772324A (en) * | 1995-10-02 | 1998-06-30 | Midwest Instrument Co., Inc. | Protective tube for molten metal immersible thermocouple |
| CN201251488Y (en) * | 2008-05-09 | 2009-06-03 | 河南大学 | Protective tube for thermoelectric pair |
-
2008
- 2008-09-18 CN CN2008101609793A patent/CN101576417B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86104974A (en) * | 1985-08-06 | 1987-02-04 | 底古萨有限公司 | Be used to measure the thermoelectric element of temperature in the vacuum drying oven |
| US5772324A (en) * | 1995-10-02 | 1998-06-30 | Midwest Instrument Co., Inc. | Protective tube for molten metal immersible thermocouple |
| CN201251488Y (en) * | 2008-05-09 | 2009-06-03 | 河南大学 | Protective tube for thermoelectric pair |
Non-Patent Citations (1)
| Title |
|---|
| JP特开平6-213731A 1994.08.05 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101576417A (en) | 2009-11-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101576417B (en) | Protective tube for thermocouple and preparation method thereof | |
| SE517894C2 (en) | FeCrAl alloy | |
| US6632018B2 (en) | Thermocouple-type temperature-detecting device | |
| CN105806504A (en) | High-temperature-resistant cheap metal armored thermocouple and manufacturing method thereof | |
| CN104236738B (en) | In a kind of the real time measure directional solidification process in formwork temperature system and method | |
| CN201251488Y (en) | Protective tube for thermoelectric pair | |
| JP2007085816A (en) | Oxygen sensor | |
| US2587391A (en) | Thermocouple | |
| CN204666271U (en) | A kind of blast furnace platinum rhodium thermocouple | |
| CN102507033A (en) | Method for measuring temperature of castings in cooling and directional-solidification process of liquid metal | |
| CN103556005A (en) | High temperature FeNiCo magnetostriction alloy as well as preparation method thereof | |
| CN104018061B (en) | Easy processing, big magnetostriction FeAl alloy strip steel rolled stock and preparation method | |
| CN204167442U (en) | Lithium battery group temperature monitoring system | |
| CN103900729B (en) | A kind of multiple point temperature measurement device of gas isolating | |
| CN211205538U (en) | Thermocouple sleeve | |
| RU2117265C1 (en) | Device measuring temperature of corrosive melts | |
| JP2006242601A (en) | Probe device for temperature measurement | |
| CN106813792A (en) | A kind of Anti-erosion durable type thermocouple | |
| CN203999916U (en) | Polycrystalline silicon ingot or purifying furnace thermocouple assembly | |
| CN86201372U (en) | Armored metal thermal resistance thermometer for bush of bearing | |
| JP2002293611A (en) | Refractory tube for induction heating furnace | |
| CN2270965Y (en) | Thermal couple for thermometer of glass molten bath with protective casing | |
| CN208704903U (en) | Sleeve kiln combustion chamber high temperature abrasion resistant thermocouple | |
| CN108950415A (en) | Surface has the alloy and its preparation process of high temperature insulation characteristic | |
| CN218973660U (en) | Noble metal thermocouple of flexible measuring end |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120627 Termination date: 20140918 |
|
| EXPY | Termination of patent right or utility model |