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Gas sensor and gas sensor unit

A gas sensor and sensor technology, used in instruments, scientific instruments, measuring devices, etc., can solve problems such as damage, loss of air permeability of filter parts, deformation of filter parts, etc.

Inactive Publication Date: 2010-03-10
NGK SPARK PLUG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the sealing member is deformed by the heat generated from the exhaust manifold, the filter cannot be deformed following the deformation of the sealing member, and thus breaks, resulting in peeling from the sealing member.
In addition, even if the filter can be deformed following the deformation of the sealing member, there is a problem that the filter expands and contracts to impair the air permeability of the filter.

Method used

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  • Gas sensor and gas sensor unit
  • Gas sensor and gas sensor unit
  • Gas sensor and gas sensor unit

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0056] will refer to figure 1 and figure 2 The first embodiment will be described. Such as figure 1 and figure 2 As shown, the gas sensor 1 according to this first embodiment is, for example, an oxygen sensor, which is mounted in an exhaust system of an automobile, and detects the concentration of oxygen in the exhaust gas. The gas sensor 1 includes a detection element 20, a housing 60, a sealing member 17, a separator 18, and the like.

[0057] The detection element 20 is made of a solid electrolyte having oxygen ion conductivity. The front end of the detection element 20 is closed, and the rear end of the detection element 20 is open. The detection element 20 is tubular and has a bottom extending axially along the X direction. The front end of the detection element 20 is provided with a detection portion 20a for detecting oxygen, which is a gas component to be measured.

[0058] An engaging flange 20s is provided at an intermediate portion in the axial direction of ...

no. 2 example

[0081] will now refer to Figure 4 A second embodiment will be described. Such as Figure 4 As shown, the gas sensor 2 in the second embodiment employs a holding member 186 instead of the holding member 86 of the gas sensor 1 in the first embodiment. Other configurations are the same as the gas sensor 1 in the first embodiment. Therefore, in the second embodiment, the holding member 186 will be mainly described, and the description of other components will be briefly described or omitted.

[0082] Such as Figure 4 As shown, the holding member 186 is inserted into the through hole 17 a of the sealing member 17 . The holding member 186 is provided with a vent hole 186p leading from the front end side to the rear end side. In addition, a concave portion 186s is provided in the radial direction of the air hole 186p. The recess 186s includes a small-diameter recess 186g for setting the filter 85 and a large-diameter recess 186h for setting the screen 84 . The holding member...

no. 3 example

[0088] Next, we will refer to Figure 6 A third embodiment will be described. Such as Figure 6 As shown, the gas sensor 3 in the third embodiment employs a holding member 286 and a covering member 288 instead of the holding member 86 of the gas sensor 1 in the first embodiment. The other configurations are the same as those of the gas sensor 1 in the first embodiment. Therefore, in the third embodiment, the holding member 286 and the covering member 288 will be mainly described, and the other components will be briefly described, or their description will be omitted.

[0089] Such as Figure 6 As shown, the holding member 286 and the covering member 288 are inserted into the through hole 17 a of the sealing member 17 . Among them, the holding member 286 is provided with a vent hole 286p leading from the front end side to the rear end side. On the outer surface of the holding member 286, a stepped portion 286a for arranging a cover member 288 to be described later is form...

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PUM

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Abstract

A gas sensor including a detection element having a detection portion; a metal shell that surrounds the detection element so as to expose the detection portion to a measured atmosphere; an outer tube that is fixed to the metal shell so as to cover a rear end side of the detection element; and a seal member that is contained inside the outer tube, the seal member having a lead wire insertion hole and a through hole that penetrates in the axial direction; a tubular holding member made of a resin having a lower coefficient of thermal expansion than the seal member, the tubular holding member being held inside the through hole, the tubular holding member having a ventilation hole; and a filter that covers the ventilation hole, the filter being joined to the holding member, the filter blockingwater from passing therethrough, and the filter having air permeability.

Description

technical field [0001] The invention relates to a gas sensor and a gas sensor unit. More particularly, the present invention relates to a gas sensor and a gas sensor unit for detecting the concentration of a specific gas in an atmosphere to be measured, such as an oxygen sensor, a hydrocarbon sensor, and a nitrous oxide sensor. Background technique [0002] Patent Document 1 discloses a prior art gas sensor. This gas sensor includes a plurality of components: such as a detection element having a detection portion at its front end for detecting the concentration of a specific gas in the atmosphere to be measured; a metal case for exposing the detection portion The detection element is held in the manner of the measured atmosphere; the tubular outer tube is fixed to the metal case in such a manner as to cover the rear end of the detection element; and the sealing member is accommodated inside the outer tube and has a through hole and a wire insertion hole. A wire is inserte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/403G01N27/409
CPCG01N27/4077
Inventor 松原仪明渥美尚胜松尾康司神前和裕浅井昌弘
Owner NGK SPARK PLUG CO LTD