CN201269863Y - Solid electrolyte zirconia oxygen sensor - Google Patents
Solid electrolyte zirconia oxygen sensor Download PDFInfo
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- CN201269863Y CN201269863Y CNU2008200911936U CN200820091193U CN201269863Y CN 201269863 Y CN201269863 Y CN 201269863Y CN U2008200911936 U CNU2008200911936 U CN U2008200911936U CN 200820091193 U CN200820091193 U CN 200820091193U CN 201269863 Y CN201269863 Y CN 201269863Y
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- zirconia
- oxygen sensor
- solid electrolyte
- sensitive element
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Abstract
The utility model provides a solid electrolyte zirconia oxygen sensor, which relates to a measuring device structure with optical, mechanical and electronic integration. The solid electrolyte zirconia oxygen sensor aims at solving such problems of the existing zirconia oxygen sensor as high leakage rate of zirconium pipe, easy rupture or crack appearance of zirconium pipe, low accuracy of the oxygen sensor measurement and short working life. The central through hole arranged on a flange seat of the solid electrolyte zirconia oxygen sensor consists of a direct through hole, a frustum-shaped hole and a threaded hole. The direct through hole, the frustum-shaped hole and the tap hole are communicated from top to bottom. A round upper groove and a round lower groove are respectively arranged on the upper surface and the lower surface of the flange seat and share the same axis with the flange seat. The opening end of a zirconia sensitive component is provided with a frustum-shaped convex edge and arranged in the frustum-shaped hole, the shape of which is corresponding to that of the convex edge. The outer side wall of the zirconia sensitive component is cemented with the inner wall of the direct through hole by inorganic glue and a locking circular ring is arranged in the threaded hole. The gap between the zirconia sensitive component and the frustum-shaped hole and the gap between the zirconia sensitive component and the locking circular ring are filled with cushion materials.
Description
Technical field
The utility model relates to a kind of structure of optical, mechanical and electronic integration measurement mechanism, is specially a kind of solid electrolyte Zirconium oxide oxygen sensor.
Background technology
The solid electrolyte Zirconium oxide oxygen sensor is the optical, mechanical and electronic integration measurement mechanism of a kind of suitable boiler best combustion control and the monitoring of Automotive Air Fuel Ratio oxygen amount, play bigger effect in fields such as energy-saving and environmental protection and Automation of Manufacturing Process, and have remarkable economic efficiency.It is the hot product of home and abroad development, exploitation and production.
Fig. 1 provides the structural representation of the solid electrolyte Zirconium oxide oxygen sensor of the boiler smoke oxygen content monitoring of adopting mostly at present, Fig. 2 is the structural representation of its flange holder 53, and Zirconium oxide oxygen sensor mostly adopts the blind-hole type tubular structure in Fig. 1---the zirconia ceramics structure of test tube shaped.Zirconia ceramics pipe with blind hole (being commonly called as the zirconium pipe) 51 is inserted in the center pit 56 of stainless steel (or other high temperature resistant, erosion-resisting material) flange holder 53, one boss 52 is set and bores mouth 55 at the perforate end of flange holder 53 with zirconia ceramics pipe 51, bonding in center pit 56 sidewalls and the gap between the zirconia ceramics pipe 51 of flange holder 53 with resistant to elevated temperatures bonding agent 54 (inorganic glue).Then, the electrode of zirconia ceramics pipe 51 inwalls is connected with platinum filament 57, and be welded on the flange holder 53, a signal output part as lambda sensor, utilize proper method (for example turn machinery crimping) that the wall electrode 58 of zirconia ceramics pipe 51 is drawn, as another signal output part of lambda sensor.
It is that the stress raisers coefficient of Zirconium oxide oxygen sensor zirconium pipe is big that there is shortcoming in the lambda sensor of this structure, thermal stress between zirconium pipe and the ring flange chassis is big, particularly circumference stress and shearing force, the leak rate height, zirconium pipe easy fracture or crackle occurs, the accuracy that causes lambda sensor to be measured is not high, and mission life is low, makes a concrete analysis of as follows:
1. because the tested flue-gas temperature of boiler is higher, be generally 600～800 ℃, and the thermal expansivity of the stainless steel material (for example SUS 304) that flange holder 53 adopts is bigger, is generally 19 * 10
-6/ ℃, and the thermal expansivity of the zirconia ceramics (for example adding the fully stabilized zirconia of yttria) that zirconia ceramics pipe 51 adopts is (8.8～12) * 10
-6/ ℃, and the PSZ thermal expansivity of interpolation yttria is 8.5 * 10
-6/ ℃, obviously the thermal expansivity of zirconia ceramics and stainless steel material differs greatly.Also, a kind of bonding agent guarantees both at home and abroad at present when high and low temperature, can both seal without any can being bonded together them, and air tight.Therefore, the reference gas A of sensor (surrounding air) will leak, and makes the flue gas B oxygen level of measurement be higher than actual value, thereby brings than mistake, has seriously reduced the accuracy that lambda sensor is measured.
2. the present flange holder 53 and the adhesive structure of zirconia ceramics pipe 51 belong to the hoop adhesive structure.Because both coefficient of thermal expansion differences are up to 8 * 10
-6～11 * 10
-6/ ℃, so when being operated in 600～800 ℃, can occur up to 5 * 10
-3～9 * 10
-3Thermal strain or thermal stress, produced so-called " circumference stress ", might make zirconia ceramics pipe 51 crackle occur.
In addition, in order to be convenient to change lambda sensor at the scene, adopt turn machinery crimping method to draw another output electrode usually.In other words, the very near fixed installation at distance zirconia ceramics pipe 51 partly and between the expose portion will produce bigger shear stress.Therefore, zirconia ceramics pipe 51 through repeatedly open stove, blowing out circulation, will cause 51 fractures of zirconia ceramics pipe or crackle occur.This will seriously influence the mission life of lambda sensor.
3. the present high-temperature adhesives that use mostly are inorganic glue, and because after the inorganic glue curing, all may there be pore in most glue-lines, so porous or micropore are the very difficult airtight effect that guarantees fully between zirconium pipe and the ring flange.In other words, tested flue gas and reference gas are easy to interpenetrate by inorganic glue-line, and obviously, this can reduce the accuracy that lambda sensor is measured widely.
Summary of the invention
The purpose of this utility model is for solving existing Zirconium oxide oxygen sensor zirconium pipe leak rate height, zirconium pipe easy fracture or crackle occurs, and the accuracy that causes lambda sensor to be measured is not high, and mission life is hanged down problem, and a kind of solid electrolyte Zirconium oxide oxygen sensor is provided.
The utility model comprises test tube shaped zirconia sensitive element, flange holder, inorganic glue, it also comprises tight lock annulus and buffering material, the central through hole that flange holder has is by clear opening, taper type hole and threaded hole are formed, clear opening, the taper type hole from top to bottom connects with threaded hole and is connected, the flange holder upper and lower surface be respectively arranged with circular upper groove and low groove and with the flange holder concentric, zirconia sensitive element perforate end has the taper type raised brim, and be arranged in the taper type hole that adapts with its shape, the lateral wall of zirconia sensitive element is bonding with inorganic glue and clear opening inwall, tight lock annulus is arranged in the threaded hole, and padded coaming is filled in the space between space between zirconia sensitive element and the taper type hole and zirconia sensitive element and the tight lock annulus.
Flange holder and tight lock annulus adopt stainless steel.
The internal diameter of the tight lock ring central through hole of tight lock annulus equates with the internal diameter of zirconia sensitive element or is close.
Padded coaming adopt oxidation aluminum wool, zirconia cotton and alumina silicate fibre wherein one or more.
The threaded hole internal diameter is greater than taper type hole internal diameter and concentric.
Advantage of the present utility model:
1, utilize common inorganic bond just can make ring flange base and zirconia ceramics pipe gummed well, impermeability is good, and leak rate is very low;
2, the last low groove and the threaded hole of She Zhiing effectively reduced the stress raisers coefficient, cushioned thermal stress, even the repeatedly hot and cold circulation impact of blow-on, blowing out of process boiler, the zirconia sensitive element can not rupture or crack yet;
3, satisfied the request for utilization of present zirconia oxygen analyzer fully, can carry out accurate measurement for the oxygen level of flue gas.
Description of drawings
Fig. 1 is a lambda sensor structural representation in the background technology, and Fig. 2 is a flange holder structural representation in the background technology, and Fig. 3 is a structural representation of the present utility model, and Fig. 4 is the structural representation of ring flange base, and Fig. 5 is a structural representation of tightly locking annulus.
Embodiment
Embodiment one: below in conjunction with Fig. 3, Fig. 4 illustrates present embodiment, present embodiment comprises test tube shaped zirconia sensitive element 1, flange holder 2, inorganic glue 4, it also comprises tight lock annulus 3 and buffering material 5, the central through hole that flange holder 2 has is by clear opening 2-3, taper type hole 2-4 and threaded hole 2-5 form, clear opening 2-3, taper type hole 2-4 from top to bottom connects with threaded hole 2-5 and is connected, flange holder 2 upper and lower surfaces be respectively arranged with circular upper groove 2-1 and low groove 2-2 and with flange holder 2 concentrics, zirconia sensitive element 1 perforate end has taper type raised brim 1-1, and be arranged among the taper type hole 2-4 that adapts with its shape, the lateral wall of zirconia sensitive element 1 is bonding with inorganic glue 4 and clear opening 2-3 inwall, tight lock annulus 3 is arranged among the threaded hole 2-5, and padded coaming 5 is filled in the space between space between zirconia sensitive element 1 and the taper type hole 2-4 and zirconia sensitive element 1 and the tight lock annulus 3.
The purpose that the perforate end of zirconia sensitive element 1 is provided with taper type raised brim 1-1 is to prevent that tubular zirconia sensitive element 1 from deviating from the central through hole of flange holder 2, simultaneously can block inorganic glue 4, make it at clear opening 2-3 madial wall position, do not contact, improve the airtight effect of this device with tested flue gas.Increased the contact area of inorganic glue 4 because so be provided with, also had the raising airtight effect with flange holder 2.
Flange holder 2 upper and lower surfaces are respectively arranged with circular upper groove 2-1 and low groove 2-2, have reduced the stress raisers coefficient of zirconia sensitive element 1 (zirconium pipe), prevent that crackle from appearring in zirconia sensitive element 1 (zirconium pipe).
Tight lock annulus 3 is arranged among the threaded hole 2-5 of flange holder 2 bottoms, and padded coaming 5 is filled in the space between the space between zirconia sensitive element 1 and the taper type hole 2-4 and zirconia sensitive element 1 and tight lock annulus 3, like this, just avoided inorganic glue 4 to contact, increased the impermeability of this device with tested flue gas.
Flange holder 2 stage casings are provided with taper type hole 2-4, so that fill padded coaming 5, buffering thermal stress and circumference stress reduce the stress raisers phenomenon.
Embodiment two: the difference of present embodiment and embodiment one is that flange holder 2 and tight lock annulus 3 adopt stainless steel.Other composition is identical with embodiment one with annexation.
Embodiment three: below in conjunction with Fig. 5 present embodiment is described, the internal diameter that present embodiment and the difference of embodiment one are tightly to lock the tight lock ring central through hole 3-1 of annulus 3 equates with the internal diameter of zirconia sensitive element 1 or is close.Other composition is identical with embodiment one with annexation.
Embodiment four: the difference of present embodiment and embodiment one be padded coaming 5 adopt oxidation aluminum wools, zirconia cotton and alumina silicate fibre wherein one or more.Other composition is identical with embodiment one with annexation.
Embodiment five: the difference of present embodiment and embodiment one is that threaded hole 2-5 internal diameter is greater than taper type hole 2-4 internal diameter and concentric.Other composition is identical with embodiment one with annexation.
Threaded hole 2-5 internal diameter is greater than taper type hole 2-4 internal diameter, like this, be arranged on the external diameter of the external diameter of the tight lock annulus 3 in the threaded hole 2-5 greater than zirconia sensitive element 1, in actual applications, in order to increase impermeability, in threaded hole 2-5, apply a little inorganic glue 4, and screw in tight lock annulus 3, till screwing.
Claims (5)
1, a kind of solid electrolyte Zirconium oxide oxygen sensor, it comprises test tube shaped zirconia sensitive element (1), flange holder (2), inorganic glue (4), it is characterized in that it also comprises tight lock annulus (3) and buffering material (5), the central through hole that flange holder (2) has is by clear opening (2-3), taper type hole (2-4) and threaded hole (2-5) are formed, clear opening (2-3), taper type hole (2-4) from top to bottom connects with threaded hole (2-5) and is connected, flange holder (2) upper and lower surface be respectively arranged with circular upper groove (2-1) and low groove (2-2) and with flange holder (2) concentric, zirconia sensitive element (1) perforate end has taper type raised brim (1-1), and be arranged in the taper type hole (2-4) that adapts with its shape, the lateral wall of zirconia sensitive element (1) is bonding with inorganic glue (4) and clear opening (2-3) inwall, tight lock annulus (3) is arranged in the threaded hole (2-5), and padded coaming (5) is filled in the space between space between zirconia sensitive element (1) and taper type hole (2-4) and zirconia sensitive element (1) and the tight lock annulus (3).
2, a kind of solid electrolyte Zirconium oxide oxygen sensor according to claim 1 is characterized in that flange holder (2) and tight lock annulus (3) adopt stainless steel.
3, a kind of solid electrolyte Zirconium oxide oxygen sensor according to claim 1, the internal diameter that it is characterized in that tightly locking the tight lock ring central through hole (3-1) of annulus (3) equates with the internal diameter of zirconia sensitive element (1) or is close.
4, a kind of solid electrolyte Zirconium oxide oxygen sensor according to claim 1, it is characterized in that padded coaming (5) adopt oxidation aluminum wool, zirconia cotton and alumina silicate fibre wherein one or more.
5, a kind of solid electrolyte Zirconium oxide oxygen sensor according to claim 1 is characterized in that threaded hole (2-5) internal diameter is greater than taper type hole (2-4) internal diameter and concentric.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200911936U CN201269863Y (en) | 2008-10-24 | 2008-10-24 | Solid electrolyte zirconia oxygen sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200911936U CN201269863Y (en) | 2008-10-24 | 2008-10-24 | Solid electrolyte zirconia oxygen sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201269863Y true CN201269863Y (en) | 2009-07-08 |
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ID=40842471
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200911936U Expired - Fee Related CN201269863Y (en) | 2008-10-24 | 2008-10-24 | Solid electrolyte zirconia oxygen sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201269863Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105044188A (en) * | 2012-03-16 | 2015-11-11 | 株式会社电装 | Gas sensor element and its manufacturing method |
-
2008
- 2008-10-24 CN CNU2008200911936U patent/CN201269863Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105044188A (en) * | 2012-03-16 | 2015-11-11 | 株式会社电装 | Gas sensor element and its manufacturing method |
| CN105044188B (en) * | 2012-03-16 | 2018-08-21 | 株式会社电装 | Gas sensor element and its manufacturing method |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090708 Termination date: 20101024 |