CN201724926U - Oxygen sensor - Google Patents
Oxygen sensor Download PDFInfo
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- CN201724926U CN201724926U CN2010202100001U CN201020210000U CN201724926U CN 201724926 U CN201724926 U CN 201724926U CN 2010202100001 U CN2010202100001 U CN 2010202100001U CN 201020210000 U CN201020210000 U CN 201020210000U CN 201724926 U CN201724926 U CN 201724926U
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- hole
- lambda sensor
- negative electrode
- carrier
- air
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Abstract
The utility model discloses an oxygen sensor. An aluminum-oxide insulating substrate is provided with an upward through hole and an air tank which is positioned below the through hole and communicated with the through hole; a zirconium-oxide detecting carrier is hermetically arranged on the through hole of the insulating substrate, the upper surface of the detecting carrier is provided with a cathode interface for contacting air to be detected, and the lower surface of the detecting carrier is provided with an anode interface for contacting atmosphere in the through hole; and a protective body is provided with a ventilating position corresponding to the cathode interface, and the ventilating position is used for the air to be detected to pass through. The respective oxygen contents of the air to be detected and the atmosphere are decomposed into different potential differences, and then the cathode interface and the anode interface transmit voltage signals through the detecting carrier so that the oxygen-containing concentration of the air to be detected is detected. The oxygen sensor can shorten processing procedures, reduce the consumption of a zirconium-oxide material, lower the production and manufacturing cost and improves the strength of the whole structure and is more durable.
Description
Technical field
The utility model relates to a kind of Lambda sensor, refers to that especially a kind of insulating carrier that utilizes is local in conjunction with the bar chip Lambda sensor that detects carrier.
Background technology
Lambda sensor (or claims oxygen detector, O
2Sensor) be located in the gas outlet of the oil gas inlet end of automobile or locomotive engine or engine by group usually and see, in order to oil gas (air and the fuel oil) mixing ratio (or claiming air-fuel ratio) that detects the engine air admittance end or the oxygen level of discarded discharge end.In other words, just use Lambda sensor to detect oxygen concentration numerical value in the tested gas (oil gas or discarded), (Engine Control Unit ECU) adjusts optimal air-fuel ratio, and reduces emission of harmful substances amount in the waste gas so that supply with engine control unit.
Traditional Lambda sensor can be divided into two kinds of heated type and non-heated types, and its difference is to have in the perception body or does not have an installing thermopair well heater.In the Lambda sensor design of heated type, the electrode holder of body internal solid electrolysis-type is rapidly heated to more than 350 ℃, detects the current potential signal of air-fuel ratio or oxygen concentration.Review the Lambda sensor of non-heated type, can only be by oil gas or the exhaust gas temperature electrode holder of heating gradually, the reaction velocity that therefore detects oxygen concentration current potential signal is slower, but still the ability that detects that can bring into normal play after a period of time at engine start.
Moreover, no matter be the electrode insulation carrier that has or do not have the solid electrolyte type of all must establishing in the Lambda sensor of heating efficiency.The typical electrode insulation carrier of tradition is with zirconia (ZrO
2) processing procedure, the high-temperature oxygen perceptron that belongs to current potential formula solid electrolyte type, it is made into the electrode holder of single long shape, be formed with the chamber groove that is communicated to atmosphere in the carrier, and just be embedded with in vivo, the metal lead wire of negative pole, and the atmosphere that is formed with in positive electrode interface and the chamber groove contacts, and be formed with the negative electrode interface and make with waste gas and contact, and just, form electrochemical reaction between negative electrode interface and the solid electrolyte type Zirconia carrier, and generation magnitude of voltage, and in single Zirconia carrier, conduct, in order to oxygen concentration or the air-fuel ratio value that detects tested gas.
Just only having in the whole carrier, negative electrode interface position periphery need produce magnitude of voltage by zirconia, the carrier location of other body positions or conduction output, might not be used as solid electrolyte by zirconia, simultaneously, because very high of the commercially available price of the former material of zirconia, but the electrode holder in the commercially available Lambda sensor only can use zirconia processing procedure solid electrolyte, to such an extent as to cause price just high, can't reduce production costs, and zirconia material intensity difference, fracture damage influences serviceable life easily, remains to be overcome and improve.
Summary of the invention
In order to overcome above-mentioned defective, the utility model provides a kind of Lambda sensor, can reduce manufacturing cost, and improves overall construction intensity.
The utility model for the technical scheme that solves its technical matters and adopt is:
A kind of Lambda sensor includes:
One insulating body, have one up through hole and be in this through hole below and communicate in an air chamber groove of through hole, an end of this air chamber groove offers the open communication atmosphere;
One detects carrier, sealing is arranged on above the through hole of insulating body, and the upper surface of this detection carrier is provided with negative electrode interface and negative electrode thereof, to contact tested gas, the lower surface of this detection carrier is provided with positive electrode interface and positive electrode thereof, with the atmosphere in the contact through hole;
One protection body is arranged at the upper surface of insulating body, and this protection body is provided with a ventilative position corresponding to the negative electrode interface, passes through for tested gas;
It is poor that the oxygen level each other of tested like this gas and atmosphere resolves into different potentials, makes the positive and negative electrode interface via detecting carrier transmission voltage signal, to detect the oxygen concentration value of tested gas.
As further improvement of the utility model, described insulating body is made of top plate and lower plywood pressing, through hole to be set respectively and to communicate the air chamber groove.
As further improvement of the utility model, described insulating body is the aluminium oxide lamellar body.
As further improvement of the utility model, described detection carrier is a solid electrolyte type zirconia lamellar body, and described positive and negative electrode interface is a platinum catalyst face.
As further improvement of the utility model, described protection body is the insulation lamellar body, and described ventilative position is the porous breathable body.
As further improvement of the utility model, described protection body is the aluminium oxide lamellar body, and described protection body corresponding to the structure that the negative electrode interface is provided with a ventilative position is: this protection body is provided with a perforate, and the porous breathable body is set in this perforate.
As further improvement of the utility model, described insulating body is below in conjunction with a well heater is arranged.
The beneficial effects of the utility model are: Lambda sensor utilizes alumina insulation matrix part to detect the structure of carrier in conjunction with zirconia, can reduce processing procedure, and reduce the zirconia material use amount, reduce manufacturing cost, and raising overall construction intensity, make Lambda sensor more durable in use, and can guarantee the ability of detecting.
Description of drawings
Fig. 1 is a schematic perspective view of the present utility model;
Fig. 2 is that the A-A of Fig. 1 is to cut-open view;
Fig. 3 is that the B-B of Fig. 1 is to cut-open view;
Fig. 4 is the perspective exploded view of Fig. 1;
Fig. 5 is the perspective exploded view of looking up angle of Fig. 4;
Fig. 6 is an insulating body and the stereographic map that detects carrier among Fig. 4;
[main element symbol description]
1---insulating body; 11---top plate; 12---lower plywood;
13---through hole; 14---the air chamber groove; 15---opening;
2---detect carrier; 21---the positive electrode interface; 22---the negative electrode interface;
23---positive electrode; 24---negative electrode; 25---link;
26---link;
3---protection body; 31---ventilative position; 32---the porous breathable body;
33---perforate;
4---well heater; 41---insulating body; 42---insulating body;
43---electric heating element; 44---electric heating element; 45---link;
46---link.
Embodiment
Embodiment: see shown in Fig. 1,2,3, this routine Lambda sensor mainly is made as elongate body or plane lamellar body, can organize in the gas outlet of the oil gas inlet end that is located at automobile, locomotive engine or engine, in order to oil gas (air and the fuel oil) mixing ratio (or claiming air-fuel ratio) that detects the engine air admittance end or the oxygen level of toxic emission end.As shown in FIG., this routine Lambda sensor mainly detects carrier 2 by an insulating body 1, and constitutes successively with its a positive and negative electrode interface 21,22 and a protection body 3, and can be in conjunction with flat heater 4 below the insulating body 1.
In the intention of this illustration shown in Fig. 1～Fig. 6 as seen, the insulating body 1 of this routine Lambda sensor can adopt aluminium oxide or alundum (Al (Al
2O
3) lamellar body, and have up a through hole 13 and the air chamber groove 14 that communicates of below thereof, offer opening 15 by an end of air chamber groove 14 and be communicated with atmosphere.Can adopt the zirconia lamellar body and detect carrier 2, be arranged on sealing above the through hole 13 of insulating body 1, and the upper surface that detects carrier 2 is provided with negative electrode interface 22 and negative electrode 24 thereof, to contact tested gas, be provided with positive electrode interface 21 and positive electrode 23 thereof in the lower surface that detects carrier 2, with the atmosphere in the contact through hole.And protection body 3 is arranged at the upper surface of insulating body 1, and protection body 3 is provided with a ventilative position 31 corresponding to negative electrode interface 22, for tested gas by and the negative electrode interface 22 of contact detection carrier 2.Well heater 4 then in two relative insulating bodies, 41,42 inside in conjunction with electric heating element 43,44, and be provided with outside link 45,46.
When reality is used the perception oxygen level, the zirconia material of Lambda sensor detects carrier 2 under the condition of high temperature, by tested gas and atmosphere each other oxygen level to resolve into different potentials poor, make positive and negative electrode interface 21,22 via detecting carrier 2 transmission voltage signals, calculate the oxygen concentration value of tested gas to cooperate outside relevant design.Because this routine Lambda sensor utilizes alumina insulation matrix 1 part to detect the frame mode of carrier 2 in conjunction with zirconia, therefore can reduce processing procedure, and reduce the zirconia material use amount, reduce manufacturing cost, and raising overall construction intensity, make product more durable in use, guarantee the ability of detecting.
Go on to say the unitized construction of this routine Lambda sensor, shown in Fig. 1～6, insulating body 1 is made as by top plate 11 and lower plywood 12 pressings and constitutes, through hole 13 to be set and the air chamber groove 14 that communicates respectively, and the upper and lower laminate 11,12 and the protection body 3 of insulating body 1 can respectively be made as the aluminium oxide lamellar body, form by a firing with pressing each other.Be made as solid electrolyte type zirconia lamellar body and detect carrier 2, and 21,22 of positive and negative electrode interfaces are made as platinum catalyst face, and can on positive and negative electrode 23,24, be provided with outside link 25,26.
Shown in Fig. 1～4, the protection body 3 of Lambda sensor can be made as the insulation lamellar body, and comprehensively in conjunction with insulating body 1, and ventilative position 31 is a porous breathable body 32.As shown in FIG., protection body 3 is made as the aluminium oxide lamellar body equally, is provided with a perforate 33 in protection body 3, so that porous breathable body 32 to be set, and fires connecting shaping each other, with protection positive and negative electrode interface 21,22 and positive and negative electrode 23,24.
This routine Lambda sensor utilizes the structure of alumina insulation matrix 1 part in conjunction with zirconia detection carrier 2, can reduce processing procedure, and reduces the zirconia material use amount, reduce manufacturing cost, and the raising overall construction intensity makes product more durable in use, guarantees the ability of detecting.
Above illustrated embodiment is the utility model for convenience of description only; and be not in a limitative way; not from the utility model spirit category; the technology personage who is familiar with the industry can residing various simple and easy variations and modification; or functor simply be equal to replacement, all should be included in the desired protection domain of the utility model.
Claims (7)
1. Lambda sensor is characterized in that: include:
One insulating body (1), have one up through hole (13) and be in this through hole (13) below and communicate in an air chamber groove (14) of through hole (13), an end of this air chamber groove (14) offers opening (15) and is communicated with atmosphere;
One detects carrier (2), sealing is arranged on above the through hole (13) of insulating body (1), the upper surface of this detection carrier (2) is provided with negative electrode interface (22) and negative electrode (24) thereof, and the lower surface of this detection carrier (2) is provided with positive electrode interface (21) and positive electrode (23) thereof;
One protection body (3) is arranged at the upper surface of insulating body (1), and this protection body (3) is provided with a ventilative position (31) corresponding to negative electrode interface (22), passes through for tested gas.
2. Lambda sensor according to claim 1 is characterized in that: described insulating body (1) is made of top plate (11) and lower plywood (12) pressing.
3. Lambda sensor according to claim 1 and 2 is characterized in that: described insulating body (1) is the aluminium oxide lamellar body.
4. Lambda sensor according to claim 3 is characterized in that: described detection carrier (2) is a solid electrolyte type zirconia lamellar body, and described positive and negative electrode interface (21,22) is a platinum catalyst face.
5. Lambda sensor according to claim 1 and 2 is characterized in that: described protection body (3) is the insulation lamellar body, and described ventilative position (31) is the porous breathable body.
6. Lambda sensor according to claim 5, it is characterized in that: described protection body (3) is the aluminium oxide lamellar body, described protection body (3) corresponding to the structure that negative electrode interface (22) is provided with a ventilative position (31) is: this protection body is provided with a perforate (33), and porous breathable body (32) is set in this perforate.
7. Lambda sensor according to claim 1 and 2 is characterized in that: described insulating body (1) is below in conjunction with a well heater (4) is arranged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202100001U CN201724926U (en) | 2010-05-31 | 2010-05-31 | Oxygen sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202100001U CN201724926U (en) | 2010-05-31 | 2010-05-31 | Oxygen sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201724926U true CN201724926U (en) | 2011-01-26 |
Family
ID=43493265
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202100001U Expired - Fee Related CN201724926U (en) | 2010-05-31 | 2010-05-31 | Oxygen sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201724926U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102262119A (en) * | 2010-05-31 | 2011-11-30 | 昆山星陶汽车电子有限公司 | Lambda sensor |
-
2010
- 2010-05-31 CN CN2010202100001U patent/CN201724926U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102262119A (en) * | 2010-05-31 | 2011-11-30 | 昆山星陶汽车电子有限公司 | Lambda sensor |
| CN102262119B (en) * | 2010-05-31 | 2015-06-17 | 昆山星陶汽车电子有限公司 | Lambda sensor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110126 Termination date: 20160531 |