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Gas sensor

A gas sensor and housing technology, which is applied in the direction of instruments, scientific instruments, measuring devices, etc., can solve the problem of reduced response performance of gas sensors, achieve the effect of shortening components and suppressing the reduction of response performance

Active Publication Date: 2010-10-20
NGK SPARK PLUG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, there is a problem that when the gas sensor element is shortened, the response performance of the gas sensor is reduced, and it is difficult to shorten the gas sensor element sufficiently short.

Method used

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Embodiment Construction

[0032] Next, a first embodiment in which the gas sensor of the present invention is applied to an oxygen sensor will be described with reference to the drawings. figure 1 It is a longitudinal sectional view showing a schematic structure of an oxygen sensor according to a first embodiment of the gas sensor of the present invention. figure 2 is enlarged figure 1 A longitudinal sectional view of the main part structure of the gas sensor. image 3 is enlarged figure 1 Partial cutaway perspective view of the main part structure of the gas sensor.

[0033] Such as figure 1 As shown, the gas sensor 100 has a closed bottomed cylindrical gas sensor element (oxygen detection element) 200 . A rod-shaped heater 101 is inserted into a cylindrical portion of the gas sensor element 200 .

[0034] The gas sensor element 200 is composed of a solid electrolyte body 1 mainly composed of zirconia or the like and has oxygen ion conductivity, and has a detection region on the front end 3 side...

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Abstract

The invention provides a gas sensor which can prevent reduction of response behavior and shorten the gas sensor element. In the gas sensor (100), at least a part of the heater contact portion (201) is is positioned on the leading end side of an imaginary line connecting the rear end and front end of the expanding portion (501) of the through hole (171); additionaly, entrance air vents 182 are provided between an inner tubular portion (184) and the metal shell (105) for guiding the gas into an inner protector (181).

Description

technical field [0001] The present invention relates to a gas sensor for detecting a specific gas (for example, oxygen, etc.) contained in a gas to be measured, such as exhaust gas of an internal combustion engine. Background technique [0002] Conventionally, a gas sensor for detecting a specific gas in a gas to be measured is known, for example, a gas sensor for detecting oxygen or the like in an exhaust gas of an internal combustion engine. In addition, as a gas sensor element used in such a gas sensor, a gas sensor element having electrode layers on the inner and outer surfaces of a solid electrolyte body having a bottomed cylindrical shape with a closed end is known. In a gas sensor using a gas sensor element with such a structure, a reference gas such as the atmosphere is introduced into the inside of the gas sensor element, and the gas to be measured is brought into contact with the outside of the gas sensor element, and the concentration of gas inside and outside the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/407G01N27/409
CPCG01N27/4077
Inventor 青木重树宫田大辅平泽真渥美尚胜藤田康弘
Owner NGK SPARK PLUG CO LTD
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