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Gas sensor

A gas sensor and gas technology, applied in instruments, scientific instruments, measuring devices, etc., can solve the problems of heat aging and waterproof failure of the breathable filter 95

Inactive Publication Date: 2007-05-09
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, in this conventional gas sensor 9, since the air-permeable filter 95 is held between the air cover 92 and the outer cover 94, the air-permeable filter 95 easily receives heat through the air cover 92 or the outer cover 94.
Therefore, when the gas sensor 9 is used many times in the exhaust system of the internal combustion engine, the air-permeable filter 95 is subjected to thermal aging, and the waterproofness of the constricted portion 940 holding the air-permeable filter 95 may fail.

Method used

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Embodiment 1

[0033] Referring to the drawings, in which like reference numerals refer to like parts in the various figures, and in particular in FIG. 1 , a gas sensor 1 according to a first embodiment of the present invention is shown.

[0034] The gas sensor includes: a sensing element 10 for detecting a specific gas concentration contained in a measurement gas, a casing 11 for accommodating the sensing element 10, an air cover 2 mounted on the base of the casing 11, and the sensing element 10 Lead wires 12 of electrical contact pass through and seal the elastic insulation 3 of the base of the air cover 2 .

[0035] As shown in Figures 1-5, the elastic insulator 3 has: a longitudinal hole 30 formed along its axial direction and opening at its top end portion, a channel portion 31 communicating with the longitudinal hole 30, and four leads 12 for accommodating four leads Insert hole 32 .

[0036] As shown in Figures 1-8, a tubular member 4 is disposed in the longitudinal hole 30, the tubu...

Embodiment 2

[0070] As shown in FIG. 9, this embodiment has a gas sensor 1 having a hollow-shaped sensing element 10 with a closed end portion. More specifically, the sensing element 10 has a hollow-shaped electrolyte body 100 , and electrode layers (not shown) provided in pairs on the inner and outer surfaces of the electrolyte body 100 . In addition, an air cavity 101 is formed in the electrolyte body 100 , and a heater 102 having a heating portion is provided in the air cavity 101 . The ends of the sensing element 10 and the connection terminal 120 are all arranged to be connected with the heater 102 and the electrode pair by the lead wires 12 and 14 .

[0071] Other composition, function and effect are identical with embodiment 1.

Embodiment 3

[0073] In this embodiment, as shown in Fig. 10, the longitudinal hole 130 of the elastic insulating member 103 is not a through hole, since it closes its bottom end in the assembly 103a. Additionally, the tubular member 104 of this embodiment does not have a head piece (element 40 in FIG. 6). Thus, the bottom 402 of the tubular element 104 and the bottom-side end 501 of the air-permeable filter 5 are in direct contact with the bottom surface 301 in the longitudinal hole 130 .

[0074] Furthermore, the lumen 410 of the tubular member 104 is flared on both the bottom side and the top side.

[0075] The other components of this embodiment are the same as those in Embodiment 1.

[0076] In this embodiment, since the longitudinal hole 130 is closed at its bottom side, water cannot seep in at the tubular member 104 or at the bottom 501 of the air-permeable filter 5 even though the bottom side of the tubular member 4 is open.

[0077] Other functions and effects of this embodiment ...

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PUM

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Abstract

A gas sensor having an elastic insulating member including a longitudinal hole for receiving an air permeability filter assembly and a passage portion communications between the longitudinal hole and an outer side thereof.

Description

technical field [0001] The invention relates to a gas sensor, which can be installed in an exhaust system and used for detecting the content of a specific gas in the measured gas. Background technique [0002] Japanese Patent Application Publication No. 1999-248671 discloses a gas sensor that can be used in an oxygen measuring device of an air-fuel ratio control system. This gas sensor detects the oxygen content in the exhaust gas of internal combustion engines such as automobiles. [0003] As shown in FIG. 20 , the gas sensor 9 with a sensing element 910 detects the concentration of a specific gas in the measurement gas. An insulating ceramic 913 is inserted in the housing 911 with the sensor element 910 therein. An air cover (air cover) 92 is mounted on the bottom of the casing 911 . [0004] The elastic insulator 93 is installed at the bottom of the air cover 92 . The resilient insulator 93 receives a lead wire 912 electrically connected at one end thereof to the sens...

Claims

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Application Information

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IPC IPC(8): G01N27/00G01N27/02G01N27/26
Inventor 山内政伸
Owner DENSO CORP