CN204630967U - A kind of automobile-used flat NOx sensor encapsulating structure - Google Patents
A kind of automobile-used flat NOx sensor encapsulating structure Download PDFInfo
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- CN204630967U CN204630967U CN201520337670.2U CN201520337670U CN204630967U CN 204630967 U CN204630967 U CN 204630967U CN 201520337670 U CN201520337670 U CN 201520337670U CN 204630967 U CN204630967 U CN 204630967U
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Abstract
A kind of automobile-used flat NOx sensor encapsulating structure, sensor holder is set in the enclosure, the ceramic gasket and talc lump that interlock and be arranged under the overlay are set in sensor holder, bottom ceramic gasket is arranged on metallic gasket, ceramic gasket, talc lump, Oxynitride sensor chip is set in metallic gasket and forms short sensor, short sensor upper end arranges outside protective pipe, outside protective pipe end processing outside protective pipe air admission hole, Oxynitride sensor chip upper end arranges the interior protection tube of protection tube air admission hole in along the circumferential direction uniform processing, bottom arranges ceramic lead terminal, afterbody arranges metal lead wire terminal, ceramic lead terminal is provided with retaining ring, metal lead wire terminal tail end arranges rubber seal, between metal lead wire terminal and shell, rubber seal is set.
Description
Technical field
The utility model belongs to measurement, the instrument of testing gas concentration or device technique field, is specifically related to a kind of automobile-used flat NOx sensor encapsulating structure.
Background technology
Automobile-used NOx sensor is as the critical component of after-treatment system, be mainly used to the concentration of measured automobiles nitrogen oxide in tail gas, for the emitted dose of SCR system catalyzer (NH3 selective reduction oxides of nitrogen, thus the discharge capacity reducing oxides of nitrogen) provides foundation.The quality of NOx sensor directly determines the discharge rate of oxides of nitrogen in vehicle exhaust.Therefore, the research of NOx sensor quality detecting system is of practical significance very much.
Automobile-used NOx sensor conventional is at present based on automobile-used flat NOx sensor, and the structure of conventional automobile-used flat NOx sensor is: high temperature sensing part, short sensor part, lead portion and integral sealing fixed part; Wherein short sensor part is welded to form sensor holder by 1 inner metal shell and hexagonal nut pedestal, 3 ceramic chamber linings, 2 talc lumps, 1 metallic gasket are pressed in Oxynitride sensor chip in sensor holder in advance; Because inner metal shell and hexagonal nut pedestal are fixed by laser bonding, error is had in concrete operations, cause inner metal shell and hexagonal nut pedestal decentraction, in pre-process of assembling, cause 3 ceramic chamber linings, 2 talc lumps, 1 metallic gasket depart from one heart, precompressed unbalance stress, sealing, heat insulation effect is undesirable, easily be subject to the impact of the factor such as external environment, temperature in use procedure, test result is unstable, fragile in sensor use procedure, test error is large, poor reliability.
Summary of the invention
Technical problem to be solved in the utility model is the shortcoming overcoming above-mentioned prior art, provide a kind of rational in infrastructure, easy to use, testing precision is high, good stability, non-damageable automobile-used flat NOx sensor encapsulating structure.
Solving the problems of the technologies described above adopted technical scheme is: arrange sensor holder in the enclosure, the ceramic gasket and talc lump that interlock and be arranged under the overlay are set in sensor holder, bottom ceramic gasket is arranged on metallic gasket, ceramic gasket, talc lump, Oxynitride sensor chip is set in metallic gasket and forms short sensor, short sensor upper end arranges outside protective pipe, outside protective pipe end processing outside protective pipe air admission hole, Oxynitride sensor chip upper end arranges the interior protection tube of protection tube air admission hole in along the circumferential direction uniform processing, bottom arranges ceramic lead terminal, afterbody arranges metal lead wire terminal, ceramic lead terminal is provided with retaining ring, metal lead wire terminal tail end arranges rubber seal, between metal lead wire terminal and shell, rubber seal is set.
Ceramic gasket of the present utility model has 3, and talc lump has 2 pieces.
Ceramic lead terminal of the present utility model has 2 and is arranged on symmetrically on Oxynitride sensor chip, and ceramic lead terminal external circumferential is uniform is processed with 4 prescription hole and metallic channels, and every center in prescription hole and the center line of metallic channel are positioned on same level line.
Metal lead wire terminal of the present utility model has 8 and is arranged on symmetrically on Oxynitride sensor chip.
Metal lead wire terminal of the present utility model is bent into bow-shaped structural by sheet metal, metal lead wire terminal is processed with card base and protruding contact point, the card base on each metal lead wire terminal and contact point are arranged in a prescription hole on ceramic lead terminal and metallic channel respectively.
The automobile-used flat NOx sensor encapsulating structure that the utility model provides devises stacked ceramic chamber lining arranged in a crossed manner and talc lump structure and realizes the sealing of Oxynitride sensor chip and fixing; the air admission hole fixed by inside and outside protection tube and process on interior protection tube and outside protective pipe ensures sealing and the test accuracy of NOx sensor; improve the fixing means of the ceramic terminal that goes between, improve the sealing of NOx sensor.The utility model is rational in infrastructure, simple to operate, test accurately determines height, measuring stability is good.
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model embodiment.
Fig. 2 is the structural representation of metal lead wire terminal 11 in Fig. 1.
Embodiment
Now in conjunction with the accompanying drawings and embodiments the utility model is further described, but the utility model is not limited to following embodiment.
Embodiment 1
In FIG, the automobile-used flat NOx sensor encapsulating structure of the present embodiment is made up of outside protective pipe 1, interior protection tube 2, sensor holder 3, ceramic gasket 4, talc lump 5, hexagonal nut 6, Oxynitride sensor chip 7, metallic gasket 8, retaining ring 9, ceramic lead terminal 10, metal lead wire terminal 11, shell 12, rubber seal 13 connection.
In order to understand further the structure of the present embodiment, it is upper for being defined as left end in Fig. 1, under right-hand member is.In sensor holder 3,3 layers of ceramic gasket 4 and 2 layers of talc lump 5 are installed in stacked intersection precompressed from top to bottom, the ceramic gasket 4 lower end fixed installation metallic gasket 8 of bottom, the ceramic gasket 4 of bottom closes up fixing with sensor holder 3 by metallic gasket 8 riveting, ceramic gasket 4, talc lump 5, Oxynitride sensor chip 7 is fixedly mounted in the center pit of metallic gasket 8 inside, sensor holder 3 external mounting hexagonal nut 6, hexagonal nut 6 can rotate freely on sensor holder 3, sensor holder 3 and be arranged on the ceramic gasket 4 of sensor holder 3 inside, talc lump 5, the high temperature sensing part composition short sensor of metallic gasket 8 and Oxynitride sensor chip 7.On the Oxynitride sensor chip 7 of short sensor upper end, riveting installs interior protection tube 2, interior protection tube 2 end is processed with interior protection tube air admission hole b along the circumferencial direction in cross section is uniform, short sensor is welded and fixed outside protective pipe 1, outside protective pipe 1 end is processed with outside protective pipe air admission hole a, be hollow structure between interior protection tube 2 and outside protective pipe 1, the talc lump 5 intersection precompressed being installed at short sensor lower end press perpendicular is squeezed post forming, to the sealing of the Oxynitride sensor chip 7 that inside is installed, completing short sensor lower end riveting by metallic gasket 8 again after sealing closes up fixing.The lead portion of Oxynitride sensor chip 7 lower end is stretched out outside short sensor, the lead portion symmetry of Oxynitride sensor chip 7 installs 2 ceramic lead terminals 10, each ceramic lead terminal 10 is processed with 4 square holes and 4 metallic channels, Oxynitride sensor chip 7 tail end is along the uniform installation of circumferencial direction 8 metal lead wire terminals 11 in cross section, metal lead wire terminal 11 is the tool bow-shaped structural springy be bent into by refractory metal sheet, as shown in Figure 2, it is processed with card base and protruding contact point, card base on metal lead wire terminal 11 and contact point are arranged on square hole on ceramic lead terminal 10 respectively and metallic channel is inner, metal lead wire terminal 11 is made to contact also reliable and external insulation with Oxynitride sensor chip 7, retaining ring 9 is installed outside ceramic lead terminal 10, retaining ring 9 is metal material and with elastic force, ceramic lead terminal 10 is by retaining ring 9 reducing, riveting is fixed on Oxynitride sensor chip 7, metal lead wire terminal 11 draws the contact conductor of Oxynitride sensor chip 7 by Oxynitride sensor chip 7 tail end, fixed by rubber seal 13 and draw, shell 12 laser bonding is arranged on sensor holder 3 and hexagonal nut 6, hexagonal nut 6 screens is fixed, the tail end of shell 12 is sealed rubber seal 13 closing in by riveting reducing.
Principle of work of the present utility model is as follows:
When using automobile-used flat NOx sensor encapsulating structure of the present utility model to measure the nitrous oxides concentration in tail gas, tail gas is by outside protective pipe air admission hole a, interior protection tube air admission hole b enters the high temperature sensing part of Oxynitride sensor chip 7, the high temperature sensing part of Oxynitride sensor chip 7 is fixedly mounted on interior protection tube 2 inside, and interior protection tube air admission hole b uniform processing on interior protection tube 2, ensure that Oxynitride sensor chip 7 can bear continuous high temperature, the tail gas flowing into Oxynitride sensor chip 7 high temperature induction region during use is steady, evenly, make induction result reliable and stable, the stacked setting of ceramic gasket 4 and talc lump 5 and secondary extrusion forming seal in short sensor part, ensure short sensor enclose inside, make the sensing of Oxynitride sensor chip 7 not by external environmental interference, reduce metrical error, the contact conductor of Oxynitride sensor chip 7 tail end is coordinated by ceramic lead terminal 10 and arched metal lead wire terminal 11 draws, the reliable conducting of contact conductor and metal lead wire terminal 11 also ensure that the reliability of Signal transmissions by the insulation of ceramic lead terminal 10, the outside outside protective pipe 1 of Oxynitride sensor chip 7, sensor holder 3, the overall package that cooperatively interacts of hexagonal nut 6 and shell 12, the induction of the Oxynitride sensor chip after encapsulation 7 and signal are exported steadily true, effectively raise the degree of accuracy that NOx sensor detects tail gas.
Claims (6)
1. an automobile-used flat NOx sensor encapsulating structure, it is characterized in that: sensor holder (3) is set in shell (12), the ceramic gasket (4) and talc lump (5) that interlock and be arranged under the overlay are set in sensor holder (3), bottom ceramic gasket (4) is arranged on metallic gasket (8), ceramic gasket (4), talc lump (5), Oxynitride sensor chip (7) is set in metallic gasket (8) and forms short sensor, short sensor upper end arranges outside protective pipe (1), outside protective pipe (1) end processing outside protective pipe air admission hole (a), Oxynitride sensor chip (7) upper end arranges the interior protection tube (2) of protection tube air admission hole (b) in along the circumferential direction uniform processing, bottom arranges ceramic lead terminal (10), afterbody arranges metal lead wire terminal (11), ceramic lead terminal (10) is arranged retaining ring (9), metal lead wire terminal (11) tail end arranges rubber seal (13), rubber seal (13) is set between metal lead wire terminal (11) and shell (12).
2. automobile-used flat NOx sensor encapsulating structure according to claim 1, is characterized in that: described ceramic gasket (4) has 3, and talc lump (5) has 2 pieces.
3. automobile-used flat NOx sensor encapsulating structure according to claim 1, it is characterized in that: described ceramic lead terminal (10) has 2 and is arranged on Oxynitride sensor chip (7) symmetrically, ceramic lead terminal (10) external circumferential is uniform is processed with 4 prescription hole and metallic channels, and every center in prescription hole and the center line of metallic channel are positioned on same level line.
4. the automobile-used flat NOx sensor encapsulating structure according to claim 1 or 3, is characterized in that: described metal lead wire terminal (11) has 8 and is arranged on symmetrically on Oxynitride sensor chip (7).
5. automobile-used flat NOx sensor encapsulating structure according to claim 1, it is characterized in that: described metal lead wire terminal (11) is bent into bow-shaped structural by sheet metal, metal lead wire terminal (11) is processed with card base and protruding contact point, the card base on each metal lead wire terminal (11) and contact point are arranged in a prescription hole on ceramic lead terminal (10) and metallic channel respectively.
6. automobile-used flat NOx sensor encapsulating structure according to claim 4, it is characterized in that: described metal lead wire terminal (11) is bent into bow-shaped structural by sheet metal, metal lead wire terminal (11) is processed with card base and protruding contact point, the card base on each metal lead wire terminal (11) and contact point are arranged in a prescription hole on ceramic lead terminal (10) and metallic channel respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520337670.2U CN204630967U (en) | 2015-05-22 | 2015-05-22 | A kind of automobile-used flat NOx sensor encapsulating structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520337670.2U CN204630967U (en) | 2015-05-22 | 2015-05-22 | A kind of automobile-used flat NOx sensor encapsulating structure |
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| CN204630967U true CN204630967U (en) | 2015-09-09 |
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| CN201520337670.2U Active CN204630967U (en) | 2015-05-22 | 2015-05-22 | A kind of automobile-used flat NOx sensor encapsulating structure |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108414572A (en) * | 2018-05-24 | 2018-08-17 | 常州联德电子有限公司 | 8 line intelligence nitrogen oxide sensor of chip and packaging method |
| 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 |
| CN110261460A (en) * | 2019-07-12 | 2019-09-20 | 莱鼎电子材料科技有限公司 | A kind of limit-current type oxygen sensor |
| CN111638248A (en) * | 2020-07-03 | 2020-09-08 | 成都昶艾电子科技有限公司 | High-temperature-resistant gas sensor and packaging method thereof |
-
2015
- 2015-05-22 CN CN201520337670.2U patent/CN204630967U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108414572A (en) * | 2018-05-24 | 2018-08-17 | 常州联德电子有限公司 | 8 line intelligence nitrogen oxide sensor of chip and packaging method |
| CN108414572B (en) * | 2018-05-24 | 2024-06-11 | 常州联德电子有限公司 | Chip type 8-wire intelligent nitrogen-oxygen sensor and packaging method |
| 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 |
| CN110261460A (en) * | 2019-07-12 | 2019-09-20 | 莱鼎电子材料科技有限公司 | A kind of limit-current type oxygen sensor |
| CN111638248A (en) * | 2020-07-03 | 2020-09-08 | 成都昶艾电子科技有限公司 | High-temperature-resistant gas sensor and packaging method thereof |
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