CN211696580U - Integrated composite silicon nitride electrode - Google Patents
Integrated composite silicon nitride electrode Download PDFInfo
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- CN211696580U CN211696580U CN202020506820.9U CN202020506820U CN211696580U CN 211696580 U CN211696580 U CN 211696580U CN 202020506820 U CN202020506820 U CN 202020506820U CN 211696580 U CN211696580 U CN 211696580U
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Abstract
The utility model discloses an integrative compound silicon nitride electrode, include: the insulating sleeve is symmetrically provided with two shaft shoulders along the two ends of the insulating sleeve in the length direction, and the two shaft shoulders are communicated through a central through hole; wherein the insulating sleeve is made of silicon nitride ceramic; the graphite rings are respectively arranged in the two shaft shoulders; the inner ring hole of the graphite ring has the same inner diameter as the central through hole; the probe core comprises a core body, a connecting end and a detecting end, wherein the connecting end and the detecting end are arranged at two ends of the core body; wherein the connecting end is provided with an external thread; the gland penetrates through the connecting end to abut against the insulating sleeve, and the nut is screwed into the external thread of the connecting end until abutting against the gland for fixing the insulating sleeve and the probe core. The composite silicon nitride electrode of the utility model has excellent sealing performance and corrosion resistance, and greatly prolongs the service life.
Description
Technical Field
The utility model relates to an electrode field for industrial boiler water level measurement, in particular to with an industrial boiler water level measurement is with integrative compound silicon nitride electrode.
Background
The instrument used for measuring the water level of the boiler steam drum is usually an electrode core conductive water level meter, the general measuring points of the electrode core conductive water level meter are 17-19, the individual measuring points are 23-27, and the measuring principle is as follows: the characteristic of the conductivity difference of the furnace water and the steam is utilized to measure, part of the electrode core is immersed in the water due to the change of the liquid level, part of the electrode core is arranged in the steam, the electrode core in the furnace water has small impedance to the cylinder, and the electrode core in the steam has large impedance to the cylinder.
The electrode core conductive water level meter used in China is composite alumina ceramic (Al)2O3-99%) and nickel alloy, the metal bears mechanical pre-tightening pressure, and the composite alumina ceramic bears external pressure, high-temperature steam scouring and chemical corrosion.
The electrode core conductive water level gauge has the following problems: firstly, the pH value of a steam-water mixture of a boiler is 9.0-9.5, and the pH value exceeds the standard or is larger than the standard by about 10, so that an electrode core is corroded in an alkaline solution quickly; secondly, the insulator of the electrode core and the welding part are easy to scale and pollute, and the insulating property is reduced; thirdly, the composite alumina ceramics of the electrode core continuously bear the scouring of high-temperature steam (300-.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a compound silicon nitride ceramic electrode utilizes gland and nut to carry out mechanical pretension design to the electrode and seals, and insulating cover adopts silicon nitride ceramic (Si)3N4) The material improves the insulating property and corrosion resistance of the electrode.
Another object of the present invention is to provide a composite silicon nitride ceramic electrode, which is made of silicon nitride ceramic (Si)3N4) The surface of the insulating sleeve made of the material is processed by fine grinding, so that the electrode is prevented from scaling.
Another object of the utility model is to provide a compound silicon nitride ceramic electrode carries out cold pressing seal, high temperature solidification to insulating cover, electrode core, graphite ring and handles, improves the sealing performance of electrode.
The utility model provides a technical scheme does:
a unitary composite silicon nitride electrode comprising: the insulating sleeve is symmetrically provided with two shaft shoulders along the two ends of the insulating sleeve in the length direction, and the two shaft shoulders are communicated through a central through hole; wherein the insulating sleeve is made of silicon nitride ceramic;
the graphite rings are respectively arranged in the two shaft shoulders; the inner ring hole of the graphite ring has the same inner diameter as the central through hole;
the probe core comprises a core body, a connecting end and a detecting end, wherein the connecting end and the detecting end are arranged at two ends of the core body;
wherein the connecting end is provided with an external thread;
the gland penetrates through the connecting end to abut against the insulating sleeve, and the nut is screwed into the external thread of the connecting end until abutting against the gland for fixing the insulating sleeve and the probe core.
Preferably, the surface of the insulating sleeve is subjected to a finish grinding process.
Preferably, the method further comprises the following steps: and the seat ring is arranged in the shaft shoulder and used for sealing the insulating sleeve and the probe core.
Preferably, the probe core is made of corrosion-resistant stainless steel.
Preferably, the probe core, the graphite ring, the seat ring and the insulating sleeve are integrated through cold pressing, sealing and high-temperature curing.
Preferably, the graphite ring is a flexible graphite tape with 98% purity.
This with neotype beneficial effect do: 1. under the high-temperature and high-pressure operation state, the service life of the electrode is prolonged by more than 5 times compared with that of the conventional electrode, the safe and stable operation of the boiler is improved, and a large amount of manpower and material resources are liberated; 2. the silicon nitride ceramic insulating sleeve with the surface processed by fine grinding integrates the functions of mechanical pressure bearing, chemical corrosion resistance and steam scouring, and thoroughly solves the problem that the electrode is easy to pollute and needs manual operation for washing; 3. the integrated composite silicon nitride ceramic electrode is compounded into a whole through processes of cold pressing, high-temperature curing, mechanical pre-tightening forming and the like, and the insulating sleeve has no gold-ceramic welding process, so that the influence of mechanical vibration and welding stress on the ceramic electrode can be eliminated; 4. the integrated composite silicon nitride ceramic electrode adopts a self-sealing structure, and the higher the pressure is, the better the sealing performance is.
Drawings
Fig. 1 is a cross-sectional view of an integrated composite silicon nitride ceramic electrode according to the present invention.
Fig. 2 is a three-dimensional view of the integrated composite silicon nitride ceramic electrode of the present invention.
Description of the drawings: 1. a probe core 2, a nut 3, a gland 4, a graphite ring 5 and an insulating sleeve,
6. washer, connecting end 11, probe end 12, core 13.
Detailed Description
The present invention is further described in detail below with reference to the drawings so that those skilled in the art can implement the invention with reference to the description.
As shown in fig. 1 and 2, the utility model provides an integrated composite silicon nitride electrode, which comprises a probe core 1, a nut 2, a gland 3, a graphite ring 4, an insulating sleeve 5 and a gasket 6.
The insulating sleeve 5 is of a cylindrical structure, two shaft shoulders are symmetrically arranged at two ends of the insulating sleeve along the length direction of the insulating sleeve, and the two shaft shoulders are communicated through a central through hole and used for protecting the probe core 1; wherein the insulating sleeve 5 is composite silicon nitride ceramic (Si)3N4) ① has high purity, high strength, low density, high temperature resistance and impact resistance, ② is extremely high temperature resistant, the strength can be maintained to 1300 ℃ without reduction, the high temperature can not be melted into a melt after being heated, the high temperature can not be decomposed until 1900 ℃, the high temperature resistant glass fiber has remarkable chemical corrosion resistance, can resist almost all inorganic acids and caustic soda solution with the purity of less than 30 percent, and can resist corrosion of a plurality of organic acids, ③ is also a high-performance electric insulating material.
The material has the following characteristics:
by contrast, it can be seen that the composite silicon nitride ceramic (Si)3N4) The physical property and the corrosion resistance of the material are better than those of composite alumina ceramic (Al)2O3-99%). The composite silicon nitride ceramic can completely meet the use condition under the extreme severe environment of steam-water mixture of a boiler drum.
The graphite ring 4 is of a circular ring structure, the inner ring hole of the graphite ring 4 is the same as the inner diameter of the central through hole, the 2 graphite rings 4 are respectively arranged in two shaft shoulders of the insulating sleeve 5, the inner ring hole and the central through hole form a cavity for accommodating the probe core 1, and the graphite ring 4 is tightly matched with the probe core 1 and the insulating sleeve 5 through pre-tightening pressure. The graphite ring 4 adopts a flexible graphite belt with the purity of 98 percent, which is also called an expanded graphite belt. The graphite ring is formed by winding and die pressing low-sulfur expanded graphite belts, has accurate size and definite density, and does not have any additional filler or adhesive. Has good rebound resilience and chemical stability, and can provide effective sealing function. Is suitable for media such as hot water, high-temperature, high-pressure steam, heat exchange liquid, nitrogen, organic solvent, hydrocarbon, low-temperature liquid and the like.
The probe core 1 is a core component for detecting water level, and comprises a core body 13, a connecting end 11 and a detecting end 12, wherein the core body 13 and the connecting end 11 are both in a cylinder structure, the outer diameter of the core body is the same as the inner diameter of a central through hole, external threads are distributed on the periphery of the connecting end 11, the detecting end 12 is in a boss structure, and the radius of the detecting end is larger than the inner diameter of the central through hole. Mounting of the probe core 1: core 13 and link 11 support until probe end 12 supports and leans on 5 one ends of insulating cover through graphite ring 4 and central through-hole, and link 11 stretches out outside 5 other ends of insulating cover, and insulating cover 5 plays protection and insulating effect to probe core 1 this moment, prevents that probe core 1 from being corroded.
The gland 3 is provided with a central hole which is in clearance fit with the connecting end 11, and internal threads are distributed on the inner periphery of the nut 2. When the silicon nitride electrode is required to be subjected to mechanical pre-tightening forming, the gland 3 penetrates through the connecting end 11 and abuts against the insulating sleeve 5, the nut 2 is screwed into the external thread of the connecting end 11 until the nut abuts against the gland 3, and the insulating sleeve 5 and the probe core 1 are further fixed.
The integrated composite silicon nitride electrode of the embodiment has the following advantages: firstly, the insulating sleeve is made of silicon nitride ceramic material, so that the insulating sleeve has very good alkali corrosion resistance and high-temperature oxidation resistance; the impact resistance is good, and the vibration basically has no influence on the impact resistance; the invention solves the defect of infirm welding connection of the electrodes, and eliminates the process defects of electric corrosion and the like at the welding position; and thirdly, the sealing requirement under extreme conditions can be met by using mechanical pre-tightening packaging and forming.
On the basis of the electrode structure shown in the previous embodiment, the surface of the high-purity silicon nitride ceramic of the insulating sleeve 5 of the embodiment is processed by fine grinding, the roughness reaches Ra0.80, the high-purity silicon nitride ceramic is suitable for long-term high-temperature steam-water mixture without scale hanging, and meanwhile, the high-purity silicon nitride ceramic is designed into a mechanical pressure-bearing body, is subjected to mechanical pressure, chemical corrosion and high-temperature steam scouring into a whole, and can thoroughly isolate the influence of the scale on the insulativity of the electrode.
On the basis of the electrode structure shown in the above embodiment, the composite silicon nitride electrode of the present embodiment further includes: the seat circle 6 is the ring type structure, adopts stainless steel, and 2 seat circles 6 are placed respectively in the shaft shoulder of insulating cover for the leakproofness between 5 and the probe core 1 of reinforcing insulating cover prevents that probe core 1 from being corroded.
On the basis of the above embodiments, the probe core 1 of the present embodiment is made of corrosion-resistant stainless steel, which is not easily corroded, and the life of the electrode is prolonged, and the corrosion-resistant stainless steel is preferably 0Cr17Ni12Mo2(SS316) or 0Cr18Ni9(SS 304).
On the basis of the embodiment, the core body 13 and the connecting end 11 abut against one end of the insulating sleeve 5 through the graphite ring 4 and the central through hole until the detecting end 12 abuts against the other end of the insulating sleeve 5, and the connecting end 11 extends out of the other end of the insulating sleeve 5. Has the following advantages: the sealing structure and the high-temperature shaping means improve the sealing performance along with the rise of pressure and temperature; secondly, the mechanical strength characteristic enables the electrode to bear the internal and external mechanical pressure, and the designed integrated electrode has compact structure and excellent sealing.
On the basis of the above-mentioned embodiments, the graphite ring is made of a flexible graphite tape with 98% purity, also called an expanded graphite tape. The graphite ring is formed by winding and die pressing low-sulfur expanded graphite belts, has accurate size and definite density, and does not have any additional filler or adhesive. Has good rebound resilience and chemical stability, and can provide effective sealing function. Is suitable for media such as hot water, high-temperature, high-pressure steam, heat exchange liquid, nitrogen, organic solvent, hydrocarbon, low-temperature liquid and the like.
This with neotype beneficial effect do: 1. under the high-temperature and high-pressure operation state, the service life of the electrode is prolonged by more than 5 times compared with that of the conventional electrode, the safe and stable operation of the boiler is improved, and a large amount of manpower and material resources are liberated; 2. the silicon nitride ceramic insulating sleeve with the surface processed by fine grinding integrates the functions of mechanical pressure bearing, chemical corrosion resistance and steam scouring, and thoroughly solves the problem that the electrode is easy to pollute and needs manual operation for washing; 3. the integrated composite silicon nitride ceramic electrode is compounded into a whole through processes of cold pressing, high-temperature curing, mechanical pre-tightening forming and the like, and the insulating sleeve has no gold-ceramic welding process, so that the influence of mechanical vibration and welding stress on the ceramic electrode can be eliminated; 4. the integrated composite silicon nitride ceramic electrode adopts a self-sealing structure, and the higher the pressure is, the better the sealing performance is.
While the embodiments of the invention have been described above, it is not intended to be limited to the details shown, or described, but rather to cover all modifications, which would come within the scope of the appended claims, and all changes which come within the meaning and range of equivalency of the art are therefore intended to be embraced therein.
Claims (6)
1. An integrated composite silicon nitride electrode, comprising:
the insulating sleeve is symmetrically provided with two shaft shoulders along the two ends of the insulating sleeve in the length direction, and the two shaft shoulders are communicated through a central through hole; wherein the insulating sleeve is made of silicon nitride ceramic;
the graphite rings are respectively arranged in the two shaft shoulders; the inner ring hole of the graphite ring has the same inner diameter as the central through hole;
the probe core comprises a core body, a connecting end and a detecting end, wherein the connecting end and the detecting end are arranged at two ends of the core body;
wherein the connecting end is provided with an external thread;
the gland penetrates through the connecting end to abut against the insulating sleeve, and the nut is screwed into the external thread of the connecting end until abutting against the gland for fixing the insulating sleeve and the probe core.
2. The integrated composite silicon nitride electrode of claim 1, wherein the surface of the insulating jacket is finish ground.
3. The integrated composite silicon nitride electrode of claim 1 or 2, further comprising:
and the seat ring is arranged in the shaft shoulder and used for sealing the insulating sleeve and the probe core.
4. The integrated composite silicon nitride electrode of claim 3, wherein the probe core is a corrosion resistant stainless steel.
5. The integrated composite silicon nitride electrode of claim 3, wherein the probe core is cold-pressed and sealed with the graphite ring, the seat ring, and the insulating jacket, and cured at a high temperature.
6. The integrated composite silicon nitride electrode of claim 5, wherein the graphite ring is a 98% pure flexible graphite ribbon.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020506820.9U CN211696580U (en) | 2020-04-09 | 2020-04-09 | Integrated composite silicon nitride electrode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020506820.9U CN211696580U (en) | 2020-04-09 | 2020-04-09 | Integrated composite silicon nitride electrode |
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| Publication Number | Publication Date |
|---|---|
| CN211696580U true CN211696580U (en) | 2020-10-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020506820.9U Active CN211696580U (en) | 2020-04-09 | 2020-04-09 | Integrated composite silicon nitride electrode |
Country Status (1)
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| CN (1) | CN211696580U (en) |
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2020
- 2020-04-09 CN CN202020506820.9U patent/CN211696580U/en active Active
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