CN202305505U - Protective hood for gas sensor - Google Patents
Protective hood for gas sensor Download PDFInfo
- Publication number
- CN202305505U CN202305505U CN2011203889480U CN201120388948U CN202305505U CN 202305505 U CN202305505 U CN 202305505U CN 2011203889480 U CN2011203889480 U CN 2011203889480U CN 201120388948 U CN201120388948 U CN 201120388948U CN 202305505 U CN202305505 U CN 202305505U
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- Prior art keywords
- protective cover
- protective hood
- sensor
- outer protective
- interior
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- Withdrawn - After Issue
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Abstract
The utility model provides a protective hood for a gas sensor. The protective hood comprises an outer protective hood and inner protective hood, wherein the outer protective hood is fixedly connected with a sensor seat through welding; a flaring structure at the tail end of the inner protective hood is held down by a ceramic liner bushing to be fixed into the sensor seat; the front end of the inner protective hood extends out of the sensor seat; and the part of the inner protective hood, which extends outside, is in contact fit with the head part of the outer protective hood. The only requirement is to weld the outer protective hood on the sensor seat, so that welding equipment with lower power can be adopted; and meanwhile, as the inner protective hood extends out of the sensor seat, and the flaring structure preventing the inner protective hood to continue to extend is held down by the ceramic liner bushing inside, the ceramic liner bushing is protected against breakage, and the inner protective hood can be reliably fixed.
Description
Technical field
The utility model relates to a kind of gas sensor with two protective covers, belongs to the gas sensor device will technical field.
Background technology
Gas sensor is the important electric parts in the engine management system like lambda sensor, and it is installed in the engine's exhaust system, according to the variation of air-fuel ratio, outputs signal to central control module (ECU), realizes the closed-loop control to engine.The catalyst converter of engine emission closed-loop control appropriate mix is proved to be to reduce the effective ways of objectionable constituent in the tail gas.
Vehicle possibly have a small amount of ponding in the gas outlet in actual use.When engine was just started working, the water that accumulates can impact in the heated ceramic induction unit of lambda sensor, and causes ceramic induction unit to crack or micro-crack, and these crackles or micro-crack can cause the disabler of sensor.Generation for fear of this failure mode; In the actual use, often sensor is not carried out heating with full power, but adopt relatively low heating power; Even make the temperature of sensor be in a temperature that also can not crack by water slug; With the protection sensor, be sure of do not have water in the gas outlet by the time after, just sensor is carried out heating with full power.At present this temperature is generally about 300 ℃, yet can't effectively work at this temperature lower sensor.Study on Emission to engine shows, just started working objectionable constituent HC, the CO of stage discharging, the amount of NOx of engine is maximum.How to make lambda sensor just in running order,, become the problem that to consider in the lambda sensor design to reduce the discharging of starting stage harmful exhaust in stage at the beginning.
Two protective covers as shown in Figure 1 are known a kind of project organization.Through laser welding structure A10 interior protective cover A1 and outer protective cover A2 are welded on the sensor holder A5 simultaneously.Owing to adopted double shielding, can effectively reduce the risk that the A6 of ceramic induction unit suffers water slug.Yet in actual manufacture process, owing to want the through welding double layer of metal, could further protective cover and sensor holder be welded together, the power ratio of the welding gear that needs is bigger, and this has increased the input of equipment and the energy resource consumption in the use.One end A61 of ceramic induction unit places waste gas, and the other end A62 that is used for the variation of perception waste gas oxygen concentration must place clean environment to provide with reference to atmosphere, thereby must solve the problem of sensor exhaust gas side and reference side sealing in the Sensor Design.A kind of known method is to adopt talcum as airtight and watertight padding, and two ends adopt ceramic chamber lining A4, ceramic chamber lining A7 as the border, seal.Talc filler must be compacted just can provide reliable sealing, thereby ceramic chamber lining A4, ceramic chamber lining A7 can receive a bigger axial force in assembling process.If near the ceramic chamber lining A4 of exhaust gas side directly with sensor holder in step contact, this ceramic chamber lining is cracked easily, the potential risk of increase product failure.General method is that the less metal washer A3 of hardness ratio is set on the sensor holder step, in order to reduce the cracked risk of ceramic chamber lining.
Summary of the invention
The purpose of the utility model is to overcome the deficiency that prior art exists, and a kind of gas sensor protective cover is provided.
The purpose of the utility model realizes through following technical scheme:
The gas sensor protective cover; Comprise outer protective cover and interior protective cover; Characteristics are: said outer protective cover is connected fixing with sensor holder through welding; The enlarging structure of interior protective cover tail end is fixed in the sensor holder by the ceramic chamber lining pressure holding, and interior protective cover front end stretches out from sensor holder, is in contact with one another between interior protective cover front end extension and the outer protective cover head to cooperate.
Further, above-mentioned gas sensor protective cover wherein, is an interference fit between said interior protective cover tail end and the sensor holder, is transition fit between interior protective cover front end extension and the outer protective cover head.
Further, above-mentioned gas sensor protective cover, wherein, the mating surface between said interior protective cover front end extension and the outer protective cover head is the face of cylinder or disc.
Substantive distinguishing features and obvious improvement that the utility model technical scheme is outstanding are mainly reflected in:
Two protective covers of the utility model new structure only need be welded to outer protective cover on the sensor holder, thereby can adopt the lower welding gear of power ratio, reduce in the manufacture process requirement to laser welding apparatus power; Protective cover stretches out from sensor holder simultaneously, stops the enlarging structure that it continues to stretch out, and by the pressure holding of the ceramic chamber lining of inside institute, has avoided the cracked of ceramic chamber lining, realizes the effectively fixing of internal protective cover simultaneously.Not only manufacturing process is simple, and structure is more reliable.
Description of drawings
Below in conjunction with accompanying drawing the utility model technical scheme is described further:
Fig. 1: the structural representation of gas sensor protective cover in the prior art;
Fig. 2: the structural representation of the utility model gas sensor protective cover;
Fig. 3: the synoptic diagram of the another kind of structure of the utility model gas sensor protective cover.
Embodiment
As shown in Figure 2; The gas sensor protective cover comprises outer protective cover B2 and interior protective cover B1, and outer protective cover B2 is connected fixing with sensor holder B5 through laser bonding; Form weld seam B201; The enlarging structure B101 of interior protective cover tail end is fixed in the sensor holder B5 by ceramic chamber lining B4 pressure holding, and interior protective cover front end stretches out from sensor holder, is in contact with one another between interior protective cover front end extension B103 and the outer protective cover head B202 to cooperate.Interior outer protective cover main part forms the exchange gas distribution channel through the assembling cooperation.
Wherein, be interference fit between interior protective cover tail end and the sensor holder B5, to satisfy the needs of assembling process, be transition fit between interior protective cover front end extension B103 and the outer protective cover head B202; Mating surface between interior protective cover front end extension B103 and the outer protective cover head B202 is the face of cylinder of relatively length or the disc of metal wall thickness.
Two protective covers because the flow velocity of protective cover tapping gas is different, can form different air pressure at tapping after being in the waste gas stream, are convenient to waste gas and in time arrive ceramic induction unit.Waste gas gets into from the hole I of outer protective cover, and through the hole II arrival ceramic induction unit of interior protective cover, the hole III from interior protective cover flows out then, and the hole IV from outer protective cover flows out again.
Like Fig. 3 is another specific embodiment of the utility model.Outer protective cover C2 is connected fixing with sensor holder C5 through laser bonding; Form weld seam C201; The enlarging structure C 101 of interior protective cover tail end is fixed in the sensor holder C5 by ceramic chamber lining C4 pressure holding; Being interference fit between interior protective cover tail end and the sensor holder C5, to satisfy the needs of assembling process, is transition fit between interior protective cover front end extension C103 and the outer protective cover head C202.
Two protective covers because the flow velocity of protective cover tapping gas is different, can form different air pressure at tapping after being in the waste gas stream, are convenient to waste gas and in time arrive ceramic induction unit.In general, waste gas gets into from the hole I of outer protective cover, and through the hole II arrival ceramic induction unit of interior protective cover, the hole III from interior protective cover flows out then.
In sum, two protective covers of the utility model new structure only need be welded to outer protective cover on the sensor holder, thereby can adopt the lower welding gear of power ratio; Protective cover stretches out from sensor holder simultaneously, stops the enlarging structure that it continues to stretch out, by the pressure holding of the ceramic chamber lining of inside institute; Avoid the cracked of ceramic chamber lining on the one hand, realized the fixing of internal protective cover simultaneously.Not only manufacturing process is simple, and structure is more reliable.
What need understand is: the above only is the preferred implementation of the utility model; For those skilled in the art; Under the prerequisite that does not break away from the utility model principle; Can also make some improvement and retouching, these improvement and retouching also should be regarded as the protection domain of the utility model.
Claims (3)
1. gas sensor protective cover; Comprise outer protective cover and interior protective cover; It is characterized in that: said outer protective cover is connected fixing with sensor holder through welding; The enlarging structure of interior protective cover tail end is fixed in the sensor holder by the ceramic chamber lining pressure holding, and interior protective cover front end stretches out from sensor holder, is in contact with one another between interior protective cover front end extension and the outer protective cover head to cooperate.
2. gas sensor protective cover according to claim 1 is characterized in that: being interference fit between protective cover tail end and the sensor holder in said, is transition fit between interior protective cover front end extension and the outer protective cover head.
3. gas sensor protective cover according to claim 1 is characterized in that: the mating surface in said between protective cover front end extension and the outer protective cover head is the face of cylinder or disc.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203889480U CN202305505U (en) | 2011-10-13 | 2011-10-13 | Protective hood for gas sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203889480U CN202305505U (en) | 2011-10-13 | 2011-10-13 | Protective hood for gas sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202305505U true CN202305505U (en) | 2012-07-04 |
Family
ID=46374377
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203889480U Withdrawn - After Issue CN202305505U (en) | 2011-10-13 | 2011-10-13 | Protective hood for gas sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202305505U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102346179A (en) * | 2011-10-13 | 2012-02-08 | 苏州工业园区传世汽车电子有限公司 | Gas sensor protection cover |
| CN102706989A (en) * | 2012-07-05 | 2012-10-03 | 大连世有电力科技有限公司 | Sensor protection device for transformer oil gas on-line monitoring system |
-
2011
- 2011-10-13 CN CN2011203889480U patent/CN202305505U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102346179A (en) * | 2011-10-13 | 2012-02-08 | 苏州工业园区传世汽车电子有限公司 | Gas sensor protection cover |
| CN102346179B (en) * | 2011-10-13 | 2014-08-06 | 苏州工业园区传世汽车电子有限公司 | Gas sensor protection cover |
| CN102706989A (en) * | 2012-07-05 | 2012-10-03 | 大连世有电力科技有限公司 | Sensor protection device for transformer oil gas on-line monitoring system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20120704 Effective date of abandoning: 20140806 |
|
| RGAV | Abandon patent right to avoid regrant |