Gas sensor

A gas sensor and sensor electrode technology, which can be used in instruments, scientific instruments, measuring devices, etc., to solve problems such as large-scale gas sensors and achieve high precision.

Active Publication Date: 2016-04-06
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, there is a problem that the size of the gas sensor is easy to increase

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0037] use Figure 1 ~ Figure 4 The gas sensor 1 of the first embodiment will be described. The gas sensor 1 is used to measure the concentration of a predetermined gas component contained in the oxygen-containing gas g. like figure 1 As shown, the gas sensor 1 includes: a gas chamber 7, a reference gas chamber 8, a plate-shaped solid electrolyte body 2 (2p, 2m, 2s), a pump electrode 30, a monitoring electrode 40, a sensor electrode 50, a reference electrode 80, and a A plate-shaped heater 6 having a predetermined thickness. A gas g containing oxygen is introduced into the gas chamber 7 , and a reference gas is introduced into the reference gas chamber 8 .

[0038] Solid electrolyte body 2 is provided between gas chamber 7 and reference gas chamber 8 . The solid electrolyte body 2 is a plate-shaped body made of a material having oxygen ion conductivity, such as zirconia and ceria.

[0039] like figure 1 As shown, the solid electrolyte body 2 has a predetermined thickness...

Embodiment 2

[0085] Figure 5 The gas sensor 1 according to Example 2 is shown. The gas sensor 1 has a plurality of solid electrolyte bodies 2 . Specifically, the gas sensor 1 includes two solid electrolyte bodies 2 (2a, 2b). In addition, the pump unit 3 is configured using one solid electrolyte body 2a, and the monitoring unit 4 and the sensor unit 5 are configured using the other solid electrolyte body 2b. In the Z direction, the distance Da between one solid electrolyte body 2 a and the heater 6 is equal to the distance Db between the other solid electrolyte body 2 b and the heater 6 . To be precise, the distance Da is the shortest distance between the main surface 22a of the solid electrolyte body 2a and the main surface 90 of the insulating layer 61 opposite to the main surface 22a, and the distance Db is the distance between the main surface 22b of the solid electrolyte body 2b and the insulating layer 61. The shortest distance between the main faces 90 of the layers 61.

[0086]...

Embodiment 3

[0090] Image 6 The gas sensor 1 according to Example 3 is shown. The gas sensor 1 is different from the first embodiment in the position of the heater 6 . That is, a gas chamber 7 is provided between the heater 6 and the solid electrolyte body 2 . Further, heater 6 faces solid electrolyte body 2 across gas chamber 7 .

[0091] Other configurations are the same as in Embodiment 1. In addition, in Image 6 Among the symbols used in , the same parts as those used in Example 1 represent the same components as in Example 1, unless otherwise indicated.

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Abstract

Provided is a gas sensor which achieves a reduction in the power consumption of a heater and downsizing by configuring a pump cell (3) and a sensor cell (5) from one solid electrolyte body (2), a pump electrode (30), a sensor electrode (50), and a reference electrode (80). By making the ratio of the shortest distance (L2) between the pump electrode (30) and the sensor electrode (50) to the thickness (d) of the solid electrolyte body (2) 3 or more, in a gas sensor (1), the pump cell (3) and the sensor cell (5) can be configured from one solid electrolyte body (2), the pump electrode (30), the sensor electrode (50), and the reference electrode (80). Therefore, only either a gas chamber or a reference chamber is present between the solid electrolyte body and the heater, thereby the distances between the pump cell and the heater and between the sensor cell and the heater can be reduced, and the pump cell and the sensor cell can be easily heated by the heater.

Description

technical field [0001] The present invention relates to a gas sensor for measuring the concentration of a predetermined gas component contained in an oxygen-containing gas. Background technique [0002] For example, Patent Document 1 below discloses a gas sensor for measuring the concentration of NOx contained in exhaust gas of an automobile, which includes two solid electrolyte bodies having oxygen ion conductivity. The two solid electrolyte bodies each have a sheet shape and face each other in the thickness direction thereof. There is a space between the two solid electrolyte bodies, and this space becomes a gas chamber into which gas (exhaust gas) is introduced. Each solid electrolyte body has a surface exposed to gas and a surface opposite to it exposed to a reference gas such as the atmosphere. [0003] Each solid electrolyte body has electrodes formed on both surfaces thereof. A pump unit is formed of one of the two solid electrolyte bodies (hereinafter also referre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/416G01N27/419
CPCG01N27/419G01N27/4071G01N27/409G01N27/41
Inventor 荒木贵司水谷圭吾中藤充伸
Owner DENSO CORP
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