CN102346178A - Gas transducer seal component and an automobile oxygen sensor - Google Patents
Gas transducer seal component and an automobile oxygen sensor Download PDFInfo
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- CN102346178A CN102346178A CN2010102403333A CN201010240333A CN102346178A CN 102346178 A CN102346178 A CN 102346178A CN 2010102403333 A CN2010102403333 A CN 2010102403333A CN 201010240333 A CN201010240333 A CN 201010240333A CN 102346178 A CN102346178 A CN 102346178A
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Abstract
The invention provides a gas transducer seal component comprising at least two segments, wherein at least a mixing talcum unit and a boron nitride unit are contained; and the boron nitride unit contains glass fiber. The invention also provides an automobile oxygen sensor employing the gas transducer seal component. The gas transducer seal component of the invention has good high temperature resistance and tightness.
Description
Technical field
The invention belongs to the gas sensor field, relate in particular to a kind of gas sensor seal and a kind of automotive oxygen sensor.
Background technology
Chip oxygen sensor, promptly sensing element is the zirconia of multilayer build-up.The end of probe of sensing element and reference end detect auto exhaust and airborne oxygen content respectively; And convert the oxygen concentration difference to voltage signal and pass to Engine ECU; Thereby the control distributive value guarantees that ternary catalyzing unit transforms and purifies all contaminations in the auto exhaust.Very high when lambda sensor is produced to the sealing effectiveness requirement, otherwise test data is inaccurate, and the life-span of lambda sensor is very short.
For guaranteeing the sealing of lambda sensor, be employed in the sensing element middle part usually encapsulant is set in the prior art, keep apart the end of probe and the reference end of sensing element.The temperature of auto exhaust is higher, so the heat-resisting quantity of seal is had relatively high expectations.
Common encapsulant is mainly the powdery talc that tamps on the market.For example, disclose a kind of detecting head among the CN1269887A, adopted the seal element of processing by saponite in this detecting head.The pressure decision that the consolidation degree of sealing element is given by the ceramic moulded part at seal element two ends fully, and seal element only adopts saponite, and intensity is lower, is difficult to guarantee long term reliability under High Temperature High Pressure.
Disclose a kind of sealing that is used for the sensing element of gas sensor among the CN1222975A, be provided with at least one seal element, seal element has the potpourri of boron nitride and at least a oxide ceramic compound to process.The sealing element still is difficult to proof strength and consolidation degree, under hot conditions, uses for a long time to cause powder loose easily, loses due sealing.
Summary of the invention
The invention solves that the seal element resistance to elevated temperatures that exists in the prior art is poor, the technical matters of sealing difference.
The invention provides a kind of gas sensor seal, said gas sensor seal contains at least two sections, wherein contains at least one section and mixes talcum unit and at least one section boron nitride unit; Wherein contain glass fibre in the boron nitride unit.
The present invention also provides a kind of automotive oxygen sensor, comprises pedestal and is arranged in the sensing element on the pedestal; Sensing element has two ends, and an end is an end of probe, and the other end is a reference end; Be provided with packoff between sensing element and the pedestal, be used for the end of probe and the reference end of isolated sensing element; Said packoff is made up of two sections ceramic supporting bodies and the seal between two sections ceramic supporting bodies; Wherein, said seal is a gas sensor seal provided by the invention.
Gas sensor seal provided by the invention; Be two sections or multi-segment structure; Contain glass fibre in the boron nitride elementary section wherein; Glass fibre has wetting action; Fusion infiltrates into each zone, boron nitride unit under the high temperature; Improve the intensity of boron nitride unit, and combine closely, thereby make seal element of the present invention have good heat-resistance property and sealing with mixing the talcum layer.Can find out that from the test result of embodiment seal of the present invention has good sealing property to 900 ℃ gas, and can guarantee that slip is less than 0.1ml/min under 0.4MPa pressure.
Description of drawings
Fig. 1 is the gas sensor seal synoptic diagram of the embodiment of the invention 1.
Fig. 2 is the gas sensor seal synoptic diagram of the embodiment of the invention 2.
Fig. 3 is an automotive oxygen sensor synoptic diagram of the present invention.
Embodiment
The invention provides a kind of gas sensor seal, said gas sensor seal contains at least two sections, wherein contains at least one section and mixes talcum unit and at least one section boron nitride unit; Said boron nitride contains glass fibre in the unit.
The present inventor finds through a large amount of experiments, in boron nitride, mixes glass fibre, can effectively improve the intensity of boron nitride, and with mix the talcum unit and have good associativity.Because glass fibre has good wetting action, fusion infiltrates into each zone, boron nitride unit under the high temperature, in the boron nitride unit, is net distribution, thereby guarantees that boron nitride unit self combines closely to have intensity preferably; In addition, the boron nitride unit also improves with the adhesion of mixing the talcum layer, thereby combines closely between each section of seal.
The content of glass fibre is in preferable range of the present invention the time, the heat-resisting quantity of gas sensor seal of the present invention and better tightness.Quality with the boron nitride unit is a benchmark, and in the said boron nitride unit, the content of boron nitride is 80-95%, and the content of glass fibre is 5-20%.
Wherein, the diameter of glass fibre is 1-2 μ m, and length is 40-70 μ m, and softening temperature is 650-680 ℃, and melt temperature is 660-720 ℃.Among the present invention, behind the employing glass fibre, the tolerable temperature of seal can reach 700 ℃ in the boron nitride unit.
Among the present invention, mix in the talcum unit and contain the various encapsulants that those skilled in the art use always, for example talcum, quartz, graphite, feldspar, aluminium oxide and/or molybdenum disulfide.Among the present invention, said mixing talcum preferably contains talcum, quartz, graphite, feldspar, aluminium oxide and molybdenum disulfide in the unit.Under the situation, be benchmark with the quality of mixing the talcum unit more preferably, the content of talcum is 30-60%; Quartzy content is 10-30%, and the content of graphite is 5-15%, and the content of feldspar is 5-15%; The content of aluminium oxide is 5-15%, and the content of molybdenum disulfide is 2-10%.
Gas sensor seal of the present invention contains at least two sections, and wherein at least one section is mixed talcum unit and at least one section boron nitride unit.Under the preferable case, said gas sensor seal is two-part structure or three stage structure.For example, when gas sensor of the present invention was formed by two sections, then one section was mixing talcum unit, and another section is the boron nitride unit; The quality of wherein mixing the talcum unit is the twice of the quality of boron nitride unit.When gas sensor of the present invention is formed by three sections, then contain two sections and mix talcum unit and one section boron nitride unit, and mix the two ends that the talcum unit is positioned at seal, the centre is the boron nitride unit; Three sections identical in quality.Under the preferable case, seal adopts three stage structure.
The preparation method of gas sensor seal of the present invention; Comprise difference compression moulding mixing talcum unit and boron nitride unit earlier; Arranged in mould at least one section mixing talcum unit and one section boron nitride unit then; Remove moisture and organism through high-temperature baking then, can obtain gas sensor seal of the present invention.Baking temperature is 660-700 ℃, and stoving time is 0.5-2h.It is conventionally known to one of skill in the art preparing the method for mixing talcum unit and boron nitride unit, does not give unnecessary details among the present invention.
Gas sensor seal of the present invention also has good sealing property to materials such as gas, aqueous water, fuel oils.Thereby can be used thermal shock resistance, freedom from vibration and serviceable life that packing washer and spring further improve seal as required.
The invention provides a kind of automotive oxygen sensor, comprise pedestal and be arranged in the sensing element on the pedestal; Sensing element has two ends, and an end is an end of probe, and the other end is a reference end; Be provided with packoff between sensing element and the pedestal, be used for the end of probe and the reference end of isolated sensing element; Said packoff is made up of two sections ceramic supporting bodies and the seal between two sections ceramic supporting bodies; Wherein, said seal is a gas sensor seal provided by the invention.
Have through hole on the pedestal, be arranged on the pedestal thereby sensing element passes this through hole.Packoff is sheathed on the sensing element; And be positioned at the through hole of pedestal; Be used to fill the space between sensing element and the pedestal; Thereby the end of probe and the reference end of isolated sensing element; Prevent that auto exhaust from diffusing to the reference end of sensing element or the end of probe that reference gas diffuses to sensing element, causes detection signal inaccurate.
As those skilled in the art's common practise, have better intensity and sealing for making seal, the two ends of seal are equipped with ceramic supporting body, thereby constitute axially from the two ends squeeze sealing member of packoff along the pedestal through hole.Adopt this ceramic supporting body, from the two ends extruding filler of seal, thereby the intensity and the sealing of assurance seal in addition, can also improve the freedom from vibration of seal.Wherein, the ceramic supporting body of the end of probe of close sensing element is last ceramic supporting body, and the ceramic supporting body of the reference end of close sensing element is following ceramic supporting body.The material of ceramic supporting body is conventionally known to one of skill in the art, for example can adopt the preparation of talcum sintering.
Below in conjunction with accompanying drawing and embodiment, gas sensor seal of the present invention and automotive oxygen sensor are further elaborated.
Fig. 1,2 is the synoptic diagram of gas sensor of the present invention.As shown in Figure 1, said gas sensor seal 3 has the two-part structure, and wherein one section is mixing talcum unit 31, and the other end is boron nitride unit 32.As shown in Figure 2, said gas sensor seal 3 has three stage structure, and wherein interlude is boron nitride unit 32, and other two sections are mixing talcum unit 31.
Fig. 3 is an automotive oxygen sensor provided by the invention.As shown in Figure 3, automotive oxygen sensor comprises pedestal 1 and is arranged in the sensing element 2 on the pedestal 1.The left end of sensing element 2 is an end of probe 21, and right-hand member is a reference end 22.Have through hole 11 on the pedestal 1, sensing element 2 passes this through hole 11.
Be provided with packoff between pedestal 1 and the sensing element 2.Packoff is sheathed on the sensing element 2, and is positioned at the through hole 11 of pedestal 1.As shown in Figure 3, packoff comprises seal 3 and the ceramic supporting body that is positioned at seal 3 two ends, and wherein the ceramic supporting body in seal 3 left sides is last ceramic supporting body 41, and the ceramic supporting body on seal 3 right sides is following ceramic supporting body 42.Seal 3, last ceramic supporting body 41, following ceramic supporting body 42 all are sheathed on the sensing element 2, and are positioned at the through hole 11 of pedestal 1.
As those skilled in the art's common practise, as shown in Figure 3, also be provided with packing washer 51 between pedestal 1 and the last ceramic supporting body 41.Packing washer 51 is out of shape under pressure, stops auto exhaust to get into the slit between pedestal 1 and the seal 3, thereby further guarantees the excellent sealing property of automotive oxygen sensor.
End of probe 21 arranged outside of sensing element 2 have two protective metal shells that connect with pedestal 1, are respectively inner layer metal sheath 61 and outer layer metal sheath 62, are used to slow down the direct impact of auto exhaust to oxygen sensor chip, prolong the life-span of lambda sensor.The outside of the reference end 22 of sensing element 2 has the fixed cover 63 and protective sleeve 64 that is connected with pedestal 1; Wherein fixed cover 63 is positioned at protective sleeve 64 inboards, and fixed cover 63 contacts with following ceramic supporting body 42.Inner layer metal sheath 61 is connected with pedestal 1 through riveted way with fixed cover 63, and outer layer metal sheath 62 combines with pedestal 1 with the mode of protective sleeve 64 through laser bonding.
Also be provided with spring 52 between following ceramic supporting body 42 and the fixed cover 63, under the hot conditions, spring 52 is pressed on following ceramic supporting body 42, and it is defeated and dispersed to prevent effectively that seal 3 from taking place when thermal shock is vibrated with height, thus the sealing of assurance automotive oxygen sensor.
Be equipped with bleeder vent 65 on inner layer metal sheath 61 and the outer layer metal sheath 62, auto exhaust can be got in the protective metal shell, and contact with the end of probe 21 of sensing element 2.Form a cavity that is full of reference gas between fixed cover 63 and the protective sleeve 64, the reference end 22 of sensing element 2 stretches in this cavity and contacts with reference gas.Packing washer 51, last ceramic supporting body 41, seal 3, following ceramic supporting body 42, spring 52 and fixed cover 63 guarantee the isolated sealing of end of probe 21 with the reference end 22 of sensing element 2 along the tightly compacting of axial manner of the through hole 11 of pedestal 1.
When seal was the two-part structure, boron nitride unit 32 contacted with following ceramic supporting body 42, contacted with last ceramic supporting body 41 and mix talcum unit 31; And seal is when being three sections and above structure, and in the middle of boron nitride unit 32 was positioned at, last ceramic supporting body 41 all contacted with mixing talcum unit 31 with following ceramic supporting body 42.
(1) preparation raw material:
Mix the talcum unit raw material: the 45wt% talcum, 25wt% is quartzy, 10wt% graphite, feldspar 10wt%, 10wt% aluminium oxide, 5wt% molybdenum disulfide;
The boron nitride unit raw material: 85% boron nitride, 15% glass fibre (diameter 1-2 μ m, length is 40-70 μ m, softening temperature is 650 ℃, melt temperature is 680 ℃);
(2) will mix talcum unit raw material powder, absolute ethyl alcohol, abrading-ball with in 1: 1.5: 2.5 the mass ratio adding ball grinder; The PVA solution (25wt%) that adds the 5wt% that mixes talcum unit raw material powder quality then; In planetary ball mill with the rotating speed ball milling 4h of 350rpm; Drying and grinding, mistake 1000 mesh sieves obtain mixing talcum unit formation powder then; The boron nitride unit raw material is changed in the batch mixer, mix and promptly obtain boron nitride unit formation powder.
(3) with two kinds of powder for molding compression mouldings in mould respectively, pressure is set at 1500kgf, obtains one section and mixes talcum unit and one section boron nitride unit; Two segment units are arranged in mould, change in the stove, 660 ℃ are toasted 1h down, obtain the seal S1 of present embodiment, have structure shown in Figure 1.
Adopt to prepare seal with embodiment 1 identical step, difference is:
In the step (3), compression moulding mixes talcum unit and one section boron nitride unit for two sections; Three segment units are arranged in mould according to the order of mixing talcum unit-boron nitride unit-mixing talcum unit, change over to and toast the seal S2 that obtains present embodiment in the stove, have structure shown in Figure 2.
Comparative Examples 1
Directly, obtain the seal of this Comparative Examples, be designated as DS1 saponite compression moulding.
Comparative Examples 2
Is to mix at 9: 1 boron nitride, saponite by mass ratio, and compression moulding obtains the seal of this Comparative Examples, is designated as DS2.
Performance test:
Seal S1-S2 and DS2-DS2 are installed on the gas tightness machines, in the annular seal space of gas tightness machines, charge into gas, to the annular seal space internal pressure be=0.4MPa to be initial gas pressure P
1Termination air pressure P in the annular seal space behind the detection 2min
2, can obtain seal S1-S2 and DS2-DS2 slip η (mL/min) to the gas of different temperatures, slip η calculates by following formula.Test result is as shown in table 1.
The volume of wherein, V---annular seal space;
V
m-molar volume of gas, 22.4Lmol
-1
R---mol gas constant constant, 8.3145JK
-1Mol
-1
T---gas temperature;
T---the test duration, 2min.
Test result is as shown in table 1.
Table 1
| Seal | 35 ℃ of slips (mL/min) | 600 ℃ of slips (mL/min) | 900 ℃ of slips (mL/min) |
| S1 | 0.03 | 0.05 | 0.08 |
| S2 | 0.03 | 0.05 | 0.08 |
| DS1 | 0.56 | 0.72 | 0.90 |
| DS2 | 0.35 | 0.48 | 0.55 |
Find out that from the test result of last table 1 S1-S2 still has good sealing property to 900 ℃ gas, and can guarantee that slip is less than 0.1ml/min under 0.4MPa pressure; Illustrate that seal of the present invention all has better seal property under normal temperature and high temperature.
Claims (10)
1. gas sensor seal, said gas sensor seal contains at least two sections, wherein contains at least one section and mixes talcum unit and at least one section boron nitride unit; It is characterized in that said boron nitride contains glass fibre in the unit.
2. gas sensor seal according to claim 1 is characterized in that, is benchmark with the quality of boron nitride unit, and in the said boron nitride unit, the content of boron nitride is 80-95%, and the content of glass fibre is 5-20%.
3. gas sensor seal according to claim 1 and 2 is characterized in that, the diameter of glass fibre is 1-2 μ m, and length is 40-70 μ m, and softening temperature is 650-680 ℃, and melt temperature is 660-720 ℃.
4. gas sensor seal according to claim 1 is characterized in that, said mixing talcum contains talcum, quartz, graphite, feldspar, aluminium oxide and/or molybdenum disulfide in the unit.
5. gas sensor seal according to claim 4; It is characterized in that; Quality to mix the talcum unit is a benchmark; The content of talcum is 30-60%; Quartzy content is 10-30%, and the content of graphite is 5-15%, and the content of feldspar is 5-15%; The content of aluminium oxide is 5-15%, and the content of molybdenum disulfide is 2-10%.
6. gas sensor seal according to claim 1 is characterized in that, said gas sensor seal is formed by two sections, and wherein one section is mixing talcum unit, and another section is the boron nitride unit; The quality of mixing the talcum unit is the twice of the quality of boron nitride unit.
7. gas sensor seal according to claim 1 is characterized in that, said gas sensor seal is formed by three sections, and wherein middle one section is the boron nitride unit, and other two sections are mixing talcum unit; Three sections identical in quality.
8. an automotive oxygen sensor comprises pedestal and is arranged in the sensing element on the pedestal; Sensing element has two ends, and an end is an end of probe, and the other end is a reference end; Be provided with packoff between sensing element and the pedestal, be used for the end of probe and the reference end of isolated sensing element; Said packoff is made up of two sections ceramic supporting bodies and the seal between two sections ceramic supporting bodies; It is characterized in that said seal is each described gas sensor seal of claim 1-7.
9. automotive oxygen sensor according to claim 8 is characterized in that, has through hole on the pedestal, and sensing element is arranged in the through hole; Packoff is sheathed on the sensing element, and is positioned at the through hole of pedestal, is used to fill the space between sensing element and the pedestal.
10. automotive oxygen sensor according to claim 8 is characterized in that, ceramic supporting body is through the preparation of sintering talcum.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102403333A CN102346178A (en) | 2010-07-26 | 2010-07-26 | Gas transducer seal component and an automobile oxygen sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102403333A CN102346178A (en) | 2010-07-26 | 2010-07-26 | Gas transducer seal component and an automobile oxygen sensor |
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| CN102346178A true CN102346178A (en) | 2012-02-08 |
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| CN2010102403333A Pending CN102346178A (en) | 2010-07-26 | 2010-07-26 | Gas transducer seal component and an automobile oxygen sensor |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103115150A (en) * | 2013-01-25 | 2013-05-22 | 镇江泛沃汽车零部件有限公司 | Manufacturing method of seal part in sheet type oxygen sensor and seal part of sheet type oxygen sensor |
| CN103134908A (en) * | 2013-01-31 | 2013-06-05 | 广东卓耐普智能技术股份有限公司 | Gas sensor |
| CN104422728A (en) * | 2013-08-27 | 2015-03-18 | 浙江福爱电子有限公司 | Oxygen sensor packaging structure |
| CN106047291A (en) * | 2015-07-21 | 2016-10-26 | 凯晟动力技术（上海）股份有限公司 | Sealing material for oxygen sensor, and preparation and sealing methods thereof |
| CN106596848A (en) * | 2016-11-15 | 2017-04-26 | 莱鼎电子材料科技有限公司 | Novel oxygen sensor and encapsulating method thereof |
| CN108872481A (en) * | 2018-06-13 | 2018-11-23 | 西安创联电气科技（集团）有限责任公司 | A kind of nitrogen oxide sensor and packaging method |
| CN113252845A (en) * | 2021-04-22 | 2021-08-13 | 联合汽车电子有限公司 | Sealing member for sealing sensing element, manufacturing method thereof and gas sensor |
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| CN103115150A (en) * | 2013-01-25 | 2013-05-22 | 镇江泛沃汽车零部件有限公司 | Manufacturing method of seal part in sheet type oxygen sensor and seal part of sheet type oxygen sensor |
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| CN106047291A (en) * | 2015-07-21 | 2016-10-26 | 凯晟动力技术（上海）股份有限公司 | Sealing material for oxygen sensor, and preparation and sealing methods thereof |
| CN106047291B (en) * | 2015-07-21 | 2019-03-22 | 凯晟动力技术（上海）股份有限公司 | It is a kind of for the sealing material of lambda sensor and its preparation and encapsulating method |
| CN106596848A (en) * | 2016-11-15 | 2017-04-26 | 莱鼎电子材料科技有限公司 | Novel oxygen sensor and encapsulating method thereof |
| CN108872481A (en) * | 2018-06-13 | 2018-11-23 | 西安创联电气科技（集团）有限责任公司 | A kind of nitrogen oxide sensor and packaging method |
| CN108872481B (en) * | 2018-06-13 | 2021-07-06 | 西安创联电气科技（集团）有限责任公司 | Nitrogen-oxygen sensor and packaging method |
| CN113252845A (en) * | 2021-04-22 | 2021-08-13 | 联合汽车电子有限公司 | Sealing member for sealing sensing element, manufacturing method thereof and gas sensor |
| CN113252845B (en) * | 2021-04-22 | 2023-10-10 | 联合汽车电子有限公司 | Sealing element for sealing sensor element, method for producing the same, and gas sensor |
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Application publication date: 20120208 |