CN102706522A - Detection device for detecting gas tightness of oxygen sensor - Google Patents
Detection device for detecting gas tightness of oxygen sensor Download PDFInfo
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- CN102706522A CN102706522A CN2012102156231A CN201210215623A CN102706522A CN 102706522 A CN102706522 A CN 102706522A CN 2012102156231 A CN2012102156231 A CN 2012102156231A CN 201210215623 A CN201210215623 A CN 201210215623A CN 102706522 A CN102706522 A CN 102706522A
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- machine body
- lambda sensor
- wireway
- dip mold
- oxygen sensor
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Abstract
The invention discloses a detection device for detecting the gas tightness of an oxygen sensor, comprising an upper machine body and a lower machine body, wherein the center of the lower machine body is provided with a lower press mould, the lower end of the lower press mould is communicated with an air source through a gas guide pipe, the gas guide pipe is provided with a pressure transmitter, and the upper end of the lower press mould is assembled with the lower part of the oxygen sensor; the upper surface of the upper machine body is provided with a pneumatic cylinder, a piston rod of the pneumatic cylinder penetrates through the center of the upper machine body to be connected with an upper press mould assembled with the upper part of the oxygen sensor, and the upper press mould is provided with a vent hole. In the invention, the gas tightness of the oxygen sensor to be detected is judged by detecting the pressure value of a gas inside a cavity positioned between an electromagnetic valve and the oxygen sensor to be detected and within a given time according to the variable quantity of the pressure of the cavity, thereby achieving high accuracy.
Description
Technical field
The present invention relates to the pick-up unit of lambda sensor, particularly a kind ofly be used to detect the bubble-tight pick-up unit of lambda sensor.
Background technology
In automobile exhaust system, ternary catalyzing unit is an important external purification device, and it can change the harmful gases such as CO, HC and NOx that vehicle exhaust is discharged into harmless carbon dioxide, water and nitrogen through oxidation and reducing action.Use triple mode catalytic converter with on the engine that reduces exhaust pollution, the lambda sensor element that is absolutely necessary.In case because the air-fuel ratio deviation theory air-fuel ratio of combination gas, three-way catalyst will sharply descend to the detergent power of CO, HC and NOx, so lambda sensor is installed in gas outlet; In order to detecting the concentration of oxygen in the exhaust, and send feedback signal to engine controller, thus the increase and decrease of control fuel injector distributive value; The air-fuel ratio of combination gas is controlled near the theoretical value,, improves the thermal efficiency to reduce the flue gas loss; Energy savings; Prevent that excessive oxygen, nitrogen, sulphur from generating the discharging of poisonous oxynitrides, reduce and pollute, the protection environment.
Oxygen sensor is installed in the exhaust system usually, directly contacts with exhaust airstream, if the bad then oxygen content in the feedback gas accurately of lambda sensor impermeability, so lambda sensor must guarantee good sealing property in use.Yet be not used to detect the bubble-tight equipment of lambda sensor at present; Therefore after the not enough lambda sensor of impermeability condition comes into operation; Must cause pollution, the thermal efficiency of engine is reduced greatly, further reduce the serviceable life of engine air.
Summary of the invention
The technical matters that the present invention solves provides and a kind ofly can accurately detect the bubble-tight pick-up unit of oxygen sensor, to prevent because the problem that the impermeability deficiency causes engine thermal efficiency to reduce occurs.
For solving the problems of the technologies described above, the technical scheme that the present invention taked is following:
Be used to detect the bubble-tight pick-up unit of lambda sensor, comprise the upper machine body and the lower body that connect through support bar; The center of said lower body is provided with dip mold, and the lower end of dip mold is communicated with air source through wireway, and wireway is provided with the pressure unit that is used to detect gaseous tension in the dip mold, and the upper end of lower pressed film is equipped mutually with the bottom of lambda sensor; The upper surface of said upper machine body is provided with pneumatic cylinder; The piston rod of pneumatic cylinder passes the center of upper machine body and stretches in the cavity between lower body and the upper machine body; The lower end of said piston rod is connected with the top die equipped mutually with lambda sensor top, and said top die is provided with air hole.
Improvement of the present invention is: the center of said lower body is provided with the staged through hole, and the upper semisection of staged through hole is equipped mutually with dip mold, and the lower semisection of staged through hole is equipped mutually with wireway, also is provided with O-ring seal between said dip mold and the wireway.
Further improvement of the present invention is: the wireway between pressure unit and the air source is provided with the solenoid valve that is used to regulate air pressure.
Owing to adopted above technical scheme, institute of the present invention acquisition of technology progress is following:
Simple in structure, the clear principle of the present invention, with low cost, easily manufactured.Install certain pressure through air source to this; Give through solenoid valve and lambda sensor to be detected then and have the pressure cavity sealed at both ends; In the given time, judge the impermeability of lambda sensor to be checked according to the variable quantity of this cavity pressure; Degree of accuracy is higher, has guaranteed that further engine system can use the qualified lambda sensor of impermeability.The staged through hole that lower body of the present invention center is provided with can make dip mold be fixed on the step, alleviates the stressed of wireway; And when putting into O-ring seal in the step, can make between dip mold and the wireway to be tightly connected, thereby guarantee that gas can not reveal from the seam of dip mold and wireway, influence the accuracy of detection of lambda sensor.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is the side view of Fig. 1.
Wherein: 1. pneumatic cylinder, 2. upper machine body, 3. support bar, 4. top die, 5. dip mold, 6. lower body, 7. wireway, 9. O-ring seal, 11. pressure units, 12. solenoid valves, 13. lambda sensors.
Embodiment
To combine specific embodiment and accompanying drawing below, the present invention will be further elaborated.
A kind ofly be used to detect the bubble-tight pick-up unit of lambda sensor, its structural representation is as shown in Figure 1.Comprise upper machine body and lower body, connect through support bar 3 between upper machine body and the lower body that upper machine body, lower body and support bar form a right frame type structure, and be as shown in Figure 2.
Lower body squarely structure is provided with dip mold and wireway in the lower body.The center of lower body is provided with the staged through hole, and the upper semisection of staged through hole is equipped mutually with dip mold, and the lower semisection of staged through hole is equipped mutually with wireway.The upper end of lower pressed film is equipped mutually with the bottom of lambda sensor, is provided with O-ring seal between the upper edge of dip mold and the lambda sensor; The lower end of dip mold is communicated with air source through wireway, and dip mold and wireway also are provided with O-ring seal.
Between air source to dip mold, be disposed with solenoid valve and pressure unit on the wireway.Solenoid valve is used to regulate the air pressure that is delivered to dip mold, and pressure unit is used to detect the pressure of gas in the dip mold.
Upper machine body is the squarely structure also, and the upper surface of upper machine body is provided with pneumatic cylinder.The piston rod of pneumatic cylinder passes the center of upper machine body and stretches in the cavity between lower body and the upper machine body, and the lower end of piston rod is connected with top die, and top die is equipped mutually with lambda sensor top.Top die is provided with air hole, is used for and air communication, and the gaseous emission that lambda sensor is revealed is to air.
The course of work of the present invention is described below:
At first O-ring seal is put into the upper semisection of lower body staged through hole, again dip mold is put into the upper semisection of staged through hole; Also place an O-ring seal in the upper surface of dip mold; Then dip mold is put in lambda sensor bottom to be checked, the anchor ring in the middle of the lambda sensor is pressed on the O-ring seal of dip mold upper surface.
Press starting switch, through the action of control circuit control pneumatic cylinder, the piston rod of pneumatic cylinder promotes top die and moves down, up to the top that top die is pressed on lambda sensor to be checked; After lambda sensor compressed, control circuit opened it through control electromagnetic valve, and the pressurized air in the air source is pressed between dip mold and the lambda sensor through wireway.Pressure unit on the wireway is monitored the pressure in the dip mold in real time, and when pressure increased to setup pressure value P1, the control circuit control electromagnetic valve was closed, and picks up counting simultaneously.
Along with the increase of time, the gas in the dip mold can leak in the top die through lambda sensor, and then from the air hole of top die, discharges, and the gas pressure value in dip mold and the lambda sensor is reduced.
When timing finishes, observe the detected pressure value P 2 of pressure unit, calculate with timing the difference P3 of the pressure value P 1 when initial, promptly need detect the impermeability of lambda sensor.Relatively the size of actual pressure difference P3 and authorised pressure difference P4 less than P4, judges then that this lambda sensor amount of leakage is qualified as if P3, and impermeability is good, can use; Otherwise, then defective.
After detecting end, control circuit control pneumatic cylinder shrinks, and makes the piston rod rising of pneumatic cylinder drive the top die rising, can lambda sensor can be taken out.
Claims (3)
1. one kind is used to detect the bubble-tight pick-up unit of lambda sensor, it is characterized in that: comprise the upper machine body (2) and the lower body (6) that connect through support bar (3); The center of said lower body is provided with dip mold (5); The lower end of dip mold is communicated with air source through wireway (7); Wireway is provided with the pressure unit (11) that is used to detect gaseous tension in the dip mold, and the upper end of lower pressed film is equipped mutually with the bottom of lambda sensor; The upper surface of said upper machine body is provided with pneumatic cylinder (1); The piston rod of pneumatic cylinder passes the center of upper machine body and stretches in the cavity between lower body and the upper machine body; The lower end of said piston rod is connected with the top die (4) equipped mutually with lambda sensor top, and said top die is provided with air hole.
2. according to claim 1ly be used to detect the bubble-tight pick-up unit of lambda sensor; It is characterized in that: the center of said lower body is provided with the staged through hole; The upper semisection of staged through hole is equipped mutually with dip mold; The lower semisection of staged through hole is equipped mutually with wireway, also is provided with O-ring seal (9) between said dip mold and the wireway.
3. according to claim 2ly be used to detect the bubble-tight pick-up unit of lambda sensor, it is characterized in that: the wireway between pressure unit and the air source is provided with the solenoid valve (12) that is used to regulate air pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102156231A CN102706522A (en) | 2012-06-27 | 2012-06-27 | Detection device for detecting gas tightness of oxygen sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102156231A CN102706522A (en) | 2012-06-27 | 2012-06-27 | Detection device for detecting gas tightness of oxygen sensor |
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| CN102706522A true CN102706522A (en) | 2012-10-03 |
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| CN2012102156231A Pending CN102706522A (en) | 2012-06-27 | 2012-06-27 | Detection device for detecting gas tightness of oxygen sensor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104931206A (en) * | 2014-03-19 | 2015-09-23 | 温州奔龙自动化科技有限公司 | Oxygen sensor airtightness testing device |
| CN105157925A (en) * | 2015-08-31 | 2015-12-16 | 巢湖子阳电器有限公司 | Airtightness detection apparatus and detection method of water level sensor of washing machine |
Citations (6)
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|---|---|---|---|---|
| JPH07167018A (en) * | 1991-03-28 | 1995-07-04 | Robert Bosch Gmbh | Testing device for determining injection pressure of pump nozzle |
| US20090211341A1 (en) * | 2005-06-29 | 2009-08-27 | Klaus Witt | Leakage Detection Based on Fluid Property Changes |
| CN201464170U (en) * | 2009-07-23 | 2010-05-12 | 天津卓远测控技术有限公司 | Flow tester |
| CN101858818A (en) * | 2010-06-21 | 2010-10-13 | 南通星维油泵油嘴有限公司 | Testing device for detecting sealing property of delivery valve matching parts |
| CN201749013U (en) * | 2010-07-02 | 2011-02-16 | 浙江博威汽车空调有限公司 | Air tightness detector of automobile expansion valve |
| CN202631214U (en) * | 2012-06-27 | 2012-12-26 | 无锡隆盛科技股份有限公司 | Detection device for detecting air impermeability of oxygen sensor |
-
2012
- 2012-06-27 CN CN2012102156231A patent/CN102706522A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07167018A (en) * | 1991-03-28 | 1995-07-04 | Robert Bosch Gmbh | Testing device for determining injection pressure of pump nozzle |
| US20090211341A1 (en) * | 2005-06-29 | 2009-08-27 | Klaus Witt | Leakage Detection Based on Fluid Property Changes |
| CN201464170U (en) * | 2009-07-23 | 2010-05-12 | 天津卓远测控技术有限公司 | Flow tester |
| CN101858818A (en) * | 2010-06-21 | 2010-10-13 | 南通星维油泵油嘴有限公司 | Testing device for detecting sealing property of delivery valve matching parts |
| CN201749013U (en) * | 2010-07-02 | 2011-02-16 | 浙江博威汽车空调有限公司 | Air tightness detector of automobile expansion valve |
| CN202631214U (en) * | 2012-06-27 | 2012-12-26 | 无锡隆盛科技股份有限公司 | Detection device for detecting air impermeability of oxygen sensor |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104931206A (en) * | 2014-03-19 | 2015-09-23 | 温州奔龙自动化科技有限公司 | Oxygen sensor airtightness testing device |
| CN104931206B (en) * | 2014-03-19 | 2018-04-06 | 浙江奔龙自动化科技有限公司 | A kind of lambda sensor air-tightness detection device |
| CN105157925A (en) * | 2015-08-31 | 2015-12-16 | 巢湖子阳电器有限公司 | Airtightness detection apparatus and detection method of water level sensor of washing machine |
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Application publication date: 20121003 |