CN2723969Y - High temperature wear resistance quick responce thermal couple - Google Patents
High temperature wear resistance quick responce thermal couple Download PDFInfo
- Publication number
- CN2723969Y CN2723969Y CN 200420087876 CN200420087876U CN2723969Y CN 2723969 Y CN2723969 Y CN 2723969Y CN 200420087876 CN200420087876 CN 200420087876 CN 200420087876 U CN200420087876 U CN 200420087876U CN 2723969 Y CN2723969 Y CN 2723969Y
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- Prior art keywords
- protection tube
- thermopair
- coating
- fast
- respond
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Abstract
The utility model discloses a sheathed thermocouple with high lifetime and high thermal response speed. The utility model comprises a thermocouple-protection tube; a thermocouple is arranged in the protection tube, and the back end of the protection tube is provided with an outer housing; the front end of the outer housing is provided with a fixing bolt, and a refractory seal cushion is arranged between the outer housing and the protection tube; the key point is that the surface of the exposed part of the protection tube is lacquered directly in ultra-high-speed with a high-hardness wear resistance coating. The structure of the utility model is fairly simple, and the key point is that the high-hardness coating lacquered with ultra-fine crystal structure and reaching metallurgical bond with the basal body of the protection tube 1 makes the protection tube (its diameter is minimally 5 millimeters) with a wear resistance coating smaller than the general diameter of the wear resistance protection tube without being sheathed with a wear resistance ceramic tube. The utility model can raise the thermal response time of the thermocouple to 5 to 10 seconds, and simultaneously makes the service life as long as more than four years.
Description
Technical field:
The utility model belongs to a kind of high-wearing feature thermopair product of high thermal response speed, can be used as the measuring sensor of enterprise's monitoring high speed two-phase flow fluid temperature variations such as electric power, metallurgy, chemical industry, environmental protection, operating temperature range 20-500 ℃.
Technical background:
With the coal-burning power plant is example: by measuring coal pulverizer outlet and pulverized coal feed pipe wind, powder mixing temperature accurately, immediately, can guarantee the homogeneity of pulverized coal preparation system safety, economical operation and each pulverized coal channel coal powder density, and prevent the obstruction of convey coal pipe effectively.But work because thermopair washes away at a high speed under environment and the higher temperature at coal dust, the hardness of some impurity is up to HV1100, far above common hardness of alloy in the coal dust.With the armoured thermocouple serious wear of plain metal shell, for example diameter is that the operation life of armoured thermocouple of φ 8 is only about one month.The time between overhaul of thermal power plant generally about 4 years, will have a strong impact on the safe operation of power plant at frequent replacing of non-overhaul phase thermopair.In order to prolong the life-span of thermocouple sheath, people have taked the increasing casing diameter, have selected the method for wear-resistant ceramic sleeve pipe or antifriction alloy for use.Though said method can prolong the serviceable life of thermopair; but after the protection tube overstriking or adopt porcelain bushing can cause the thermopair response speed significantly to reduce; for example installed that the temperature survey of thermopair reaches more than 3 minutes stabilization time behind the porcelain bushing additional; can't satisfy operational monitoring and the unit needs of control automatically, bring great hidden danger to safe operation of the boiler.Therefore, how improving thermal response speed this contradiction that increases the service life again, is technical barrier still unresolved under the specific service condition.
Summary of the invention:
Goal of the invention of the present utility model provides the armoured thermocouple of a kind of high life, high thermal response speed.
Technical solution of the present utility model is as follows: comprise protecting tube; be provided with thermopair in the protection tube; the protection tube rear end is provided with shell; the shell front end is provided with set bolt; be provided with the refractory seals pad between shell and protection tube, key is the wear-resistant coating of the direct hypervelocity spraying in the exposed parts surface high rigidity of protection tube.
Structure of the present utility model is quite simple; key is directly to apply to have the high rigidity of ultrafine-grained (UFG) microstructure and the coating that protection tube 1 matrix reaches metallurgical binding; make protection tube (its diameter minimum is 5 millimeters) need not the suit wear resistance ceramic tube with wear-resistant coating; also much smaller than the antifriction alloy protection tube diameter of routine; can make the thermal response time of thermopair bring up to 5～10 seconds; reach more than 4 years serviceable life simultaneously; the monitoring of outlet of coal fired plant coal pulverizer and pulverized coal feed pipe wind, powder mixing temperature can be adapted to fully, safety, the economic operation level of power plant can be significantly improved.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
Fig. 2 is the section amplification assumption diagram of protection tube of the present utility model.
Embodiment
See also Fig. 1～Fig. 2, embodiment of the present utility model is as follows, comprise protecting tube 1, it is common alloy material, reach certain rigidity and rigidity gets final product, be provided with thermopair in the protection tube 1, protection tube 1 rear end is provided with shell 2, shell 2 front ends are provided with set bolt 3, it is for installing and the GPF (General Protection False needs be provided with, be provided with refractory seals pad 4 between shell 2 and protection tube 1, key is that the direct hypervelocity spray coating in exposed parts surface that is protection tube 1 has one deck wear-resistant coating 5, and this wearing layer has high temperature abrasion resistance preferably; Because environment for use of the present utility model is quite abominable; when keeping coating 5 to have good wearing quality and good heat conductivity; also should keep the coating 5 and the surface of protection tube 1 to have good bonding force; so just can make and the utlity model has good thermal response speed and sufficiently long life-span; for reaching this purpose; one metallurgical binding transition bed 6 is arranged between coating 5 and protection tube 1; the essence of this transition bed 6 is that form that the material of coating 5 injects with ion in spraying process is diffused into the certain depth in the wall of protection tube 1; be that transition bed 6 is mixed zones of the material of metal or alloy material 5 and protection tube 1; this mixed zone makes coating and matrix form a kind of transition bed of metallurgical binding; bond strength is greatly improved, can reach hundreds of MPa.
The formation of above-mentioned transition bed 6 is to utilize electrothermal explosion hypervelocity directional spray method principle, and alloy silk or paper tinsel are when discharge-induced explosion, and the outside surface of metal particle (comprising metallic ion) high-speed and continuous surge protection pipe 1 forms transition bed 6 and coating 5 simultaneously.
Because the use occasion of utility model is a high temperature two-phase flow environment, coating 5 is different with the material of protection tube 1, thermal expansivity is also inequality, then can influence serviceable life, therefore by above-mentioned discharge-induced explosion method, the electrothermal explosion hypervelocity that protection tube 1 is carried out repeatedly sprays, the alloy-layer 5 that forms is the composite coating that two kinds of metals (or alloy) are alternately formed, for example coating 5 replaces the composite coating of composition (when coating thickness is 200 microns for WC-Co-department too upright 6, need alternately spray above-mentioned two kinds of materials totally 8 times), the material of protection tube 1 is Cr12, Mn13 or 1Cr18Ni9Ti steel etc. (the protection tube material hardness must not be lower than HV200), the hardness of the composite coating 5 of formation is in the HV1600-2200 scope; Perhaps be the composite coating that metal molybdenum-metallic nickel is alternately formed, the microhardness of coating 5 is in HV1300～1500 scopes.Select above-mentioned composite coating material be for the thermal expansivity that makes coating all approaching with steel, to reduce the thermal stress of coating.
Above-mentioned coating 5 (coating that comprises two layers or multilayer compound formula) thickness is generally at 80～400 microns, the thickness of transition bed 6 is generally at 5～30 microns, above-mentioned in fact coating is the high-performance coating of a kind of ultrafine-grained (UFG) microstructure (average crystal grain diameter is generally less than 300 μ m) or nanometer crystal microstructure (average crystal grain diameter is less than 100 μ m), because grain refinement can make the hardness of coating 5 and toughness significantly improve; The diameter of protection tube 1 can be 5～10mm, and the best is about 7～8mm.
Claims (9)
1. a high-temperature wearable responds thermopair fast; comprise protecting tube (1); protection tube is provided with thermopair in (1); protection tube (1) rear end is provided with shell (2); shell (2) front end is provided with set bolt (3); between shell (2) and protection tube (1), be provided with refractory seals pad (4), it is characterized in that being the direct hypervelocity spraying in the exposed parts surface coating wear-resistant coating (5) of protection tube (1).
2. respond thermopair fast by the described high-temperature wearable of claim 1, it is characterized in that having between described coating (5) and the protection tube (1) transition bed (6) of a metallurgical binding.
3. respond thermopair fast by claim 1 or 2 described high-temperature wearables, it is characterized in that described coating (5) can be for replacing the compound composite coating of forming by two kinds of metal or alloy.
4. respond thermopair fast by the described high-temperature wearable of claim 3, it is characterized in that described composite coating (5) is too upright 6 alternate combinations of WC-Co-department.
5. respond thermopair fast by the described high-temperature wearable of claim 3, it is characterized in that described composite coating (5) is metal molybdenum-metallic nickel alternate combinations.
6. respond thermopair fast by claim 1 or 2 or 4 or 5 described high-temperature wearables, the thickness that it is characterized in that described coating (5) is 80～400 microns.
7. respond thermopair fast by the described high-temperature wearable of claim 6, the thickness that it is characterized in that described metallurgical binding transition bed (6) is at 5～30 microns.
8. respond thermopair fast by the described high-temperature wearable of claim 6, the diameter that it is characterized in that protection tube (1) is 5～10mm.
9. respond thermopair fast by the described high-temperature wearable of claim 8, the diameter that it is characterized in that protection tube (1) is about 7～8mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420087876 CN2723969Y (en) | 2004-08-23 | 2004-08-23 | High temperature wear resistance quick responce thermal couple |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420087876 CN2723969Y (en) | 2004-08-23 | 2004-08-23 | High temperature wear resistance quick responce thermal couple |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2723969Y true CN2723969Y (en) | 2005-09-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420087876 Expired - Fee Related CN2723969Y (en) | 2004-08-23 | 2004-08-23 | High temperature wear resistance quick responce thermal couple |
Country Status (1)
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| CN (1) | CN2723969Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109540315A (en) * | 2018-12-29 | 2019-03-29 | 安徽天康(集团)股份有限公司 | A kind of wear-resisting type armoured thermocouple |
| CN111235514A (en) * | 2020-03-24 | 2020-06-05 | 江西省科学院应用物理研究所 | Thermocouple protective sleeve with composite coating and preparation method thereof |
| CN113373409A (en) * | 2021-05-18 | 2021-09-10 | 中国农业机械化科学研究院 | Temperature-control thermocouple protection tube and coating preparation method thereof |
-
2004
- 2004-08-23 CN CN 200420087876 patent/CN2723969Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109540315A (en) * | 2018-12-29 | 2019-03-29 | 安徽天康(集团)股份有限公司 | A kind of wear-resisting type armoured thermocouple |
| CN111235514A (en) * | 2020-03-24 | 2020-06-05 | 江西省科学院应用物理研究所 | Thermocouple protective sleeve with composite coating and preparation method thereof |
| CN113373409A (en) * | 2021-05-18 | 2021-09-10 | 中国农业机械化科学研究院 | Temperature-control thermocouple protection tube and coating preparation method thereof |
| CN113373409B (en) * | 2021-05-18 | 2022-11-22 | 中国农业机械化科学研究院 | Temperature-control thermocouple protection tube and coating preparation method thereof |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |