Conical dual-cell wide-area oxygen sensor and method for making the same

Abstract

The invention relates to the technical field of oxygen sensors, and particularly relates to a conical double cell wide-band oxygen sensor and a manufacture method thereof. The sensor comprises a conical zirconium oxide tube and a conical heating rod, wherein a reference air electrode is arranged on the inner surface of the conical zirconium oxide tube, a measuring electrode, a mixing cavity and a diffusion layer are sequentially arranged on the outer surface of the conical zirconium oxide tube, the reference air electrode arranged on the inner surface of the conical zirconium oxide tube and the measuring electrode arranged on the outer surface of the conical zirconium oxide tube form a concentration cell unit, on the basis, a compact zirconium oxide coating is arranged so as to seal the interior, and a diffusion hole is reserved, a pump cell external electrode is arranged on the outer surface of the compact zirconium oxide coating, the pump cell external electrode and the measuring electrode wrapped in the compact zirconium oxide coating form a pump cell unit, and a porous external electrode protective layer is arranged on the outer surface of the compact zirconium oxide coating. According to The conical double cell wide-band oxygen sensor, the heating efficiency of sensors can be effectively improved, and the volume of like products can be remarkably reduced.

Description

technical field [0001] The invention relates to the technical field of oxygen sensors, in particular to a conical double-battery wide-area oxygen sensor and a manufacturing method thereof. Background technique [0002] With the improvement of automobile exhaust emission regulations and engine control technology, the traditional concentration-type oxygen sensor cannot meet the requirements of the engine control system in terms of measurement accuracy and measurement range. Therefore, the dual-battery wide-area oxygen sensor based on the principle of limiting current Came into being. The existing dual-battery wide-area oxygen sensors are all chip structures. Patent 201010616977.8 discloses a tubular dual-battery wide-area oxygen sensor and its manufacturing method. It includes an inner zirconia tube, an outer zirconia tube, a heating rod and a closed-loop controller. The outer surface of the inner zirconia tube matches the inner surface of the outer zirconia tube. There is ...

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Problems solved by technology

[0003] The straight double-battery wide-area oxygen sensor disclosed in this patent is composed of two zirconia tubes superimposed. Although it is simpler in structure than the chip double-battery wide-area oxygen sensor and has significantly improved thermal shock resistance, it has The superposition of double straight tubes restricts its size from being further reduced; moreover, it is difficult to achieve a high degree of matching of the dimensions of the double tubes, and it is difficult to control the manufacturing yield; in addition, the straight double battery disclosed in this patent The sensing function area of ​​the wide-area oxygen sensor is concentrated at the top hemisphere, while the heating area of ​​the heating rod is concentrated under the top hemisphere, resulting in the heating temperature of the heating rod not being able to fully and effectively affect the sensing part, resulting in a large loss of thermal efficiency, such as figure 1 shown

[0004] In addition, U.S. Patent No. 4,712,419 discloses an air-fuel ratio sensor, which is similar in shape to the above-mentioned tube sensor, and is a straight tube type. In addition, the heater is placed outside, which not only has a large loss of thermal efficiency, but also makes it difficult to package the sensor as a whole.

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