Detection device for detecting gas tightness of oxygen sensor

An oxygen sensor and detection device technology, which is applied in the direction of using liquid/vacuum degree for liquid tightness measurement, and by measuring the acceleration and deceleration rate of fluid, etc. simple effect

Inactive Publication Date: 2012-10-03
WUXI LONGSHENG TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem solved by the present invention is to provide a detection device that can accurately detect the air tightness of the oxygen sensor, so as to prevent the problem of engine thermal efficiency reduction due to insufficient air tightness

Method used

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  • Detection device for detecting gas tightness of oxygen sensor
  • Detection device for detecting gas tightness of oxygen sensor

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Embodiment Construction

[0014] The present invention will be further described in detail below in conjunction with specific embodiments and accompanying drawings.

[0015] A detection device for detecting the airtightness of an oxygen sensor, the schematic diagram of which is shown in figure 1 shown. It includes an upper body and a lower body, the upper body and the lower body are connected by a support rod 3, and the upper body, the lower body and the support rod form a right frame structure, such as figure 2 shown.

[0016] The lower body has a square structure, and a lower die and an air guide tube are arranged in the lower body. The center of the lower body is provided with a stepped through hole, the upper half of the stepped through hole is matched with the lower die, and the lower half of the stepped through hole is matched with the air duct. The upper end of the lower pressing film is matched with the lower part of the oxygen sensor, and a sealing ring is arranged between the upper edge o...

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Abstract

The invention discloses a detection device for detecting the gas tightness of an oxygen sensor, comprising an upper machine body and a lower machine body, wherein the center of the lower machine body is provided with a lower press mould, the lower end of the lower press mould is communicated with an air source through a gas guide pipe, the gas guide pipe is provided with a pressure transmitter, and the upper end of the lower press mould is assembled with the lower part of the oxygen sensor; the upper surface of the upper machine body is provided with a pneumatic cylinder, a piston rod of the pneumatic cylinder penetrates through the center of the upper machine body to be connected with an upper press mould assembled with the upper part of the oxygen sensor, and the upper press mould is provided with a vent hole. In the invention, the gas tightness of the oxygen sensor to be detected is judged by detecting the pressure value of a gas inside a cavity positioned between an electromagnetic valve and the oxygen sensor to be detected and within a given time according to the variable quantity of the pressure of the cavity, thereby achieving high accuracy.

Description

technical field [0001] The invention relates to a detection device for an oxygen sensor, in particular to a detection device for detecting the air tightness of the oxygen sensor. Background technique [0002] In the automobile exhaust system, the three-way catalytic converter is an important external purification device, which can convert harmful gases such as CO, HC and NOx emitted from automobile exhaust into harmless carbon dioxide, water and nitrogen through oxidation and reduction. . An oxygen sensor is an essential component for an engine that uses a three-way catalytic converter to reduce exhaust pollution. Once the air-fuel ratio of the mixture deviates from the theoretical air-fuel ratio, the purification ability of the three-way catalyst for CO, HC and NOx will drop sharply, so an oxygen sensor is installed in the exhaust pipe to detect the concentration of oxygen in the exhaust gas, and to The engine controller sends a feedback signal to control the increase or ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M3/26
Inventor 谢蒙蒙倪铭孙骋业徐行徐伟
Owner WUXI LONGSHENG TECH
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