PARTICULATE DETECTION SENSOR

• Main Authors: MORITSUGU MICHIYASU, NISHIJIMA HIROTAKA, MIZUTANI YUYA
• Format: Patent
• Language: English; Japanese
• Published: 29.11.2018
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PHYSICS; TESTING

PROBLEM TO BE SOLVED: To provide a particulate detection sensor with which it is possible to facilitate the flow of a gas in a sensor and stabilize the flow speed of the gas, and to stabilize sensor output.SOLUTION: A particulate detection sensor 10 comprises a center electrode 11, a cylindrical electrode 12, a housing 13, a first gas passage 14, a second gas passage 15, and a detection unit, with a gas inlet 10a for introducing a gas g into the first gas passage 14 provided at one end and a gas outlet 10b for discharging the gas g from the second gas passage 15 provided at the other end. The first gas passage 14 and the second gas passage 15 communicate with each other at the other end. The gas inlet 10a includes a plurality of openings 13a arranged on a circumference enclosing the gas outlet 10b. The gas outlet 10b is provided projecting by a greater dimension than is the gas inlet 10a. The diameter of an opening 13a on the upstream side of a gas G flowing on the outside of the gas inlet 10a is smaller than the diameter of the opening 13a on the downstream side of the gas G.SELECTED DRAWING: Figure 2 【課題】センサ内でガスを流れやすくしてガスの流速を安定させ、センサ出力を安定させることができる微粒子検出センサを提供する。【解決手段】微粒子検出センサ１０は、中心電極１１と、筒状電極１２と、ハウジング１３と、第１ガス流路１４と、第２ガス流路１５と、検出部と、を備え、一端にガスｇを第１ガス流路１４へ取り込むためのガス入口１０ａと、ガスｇを第２ガス流路１５から排出するためのガス出口１０ｂとが設けられている。第１ガス流路１４と第２ガス流路１５は、他端で連通している。ガス入口１０ａは、ガス出口１０ｂを取り囲む円周上に配置された複数の開口部１３ａを有している。ガス出口１０ｂは、ガス入口１０ａよりも突出して設けられている。ガス入口１０ａの外側を流れるガスＧの上流側の開口部１３ａの直径は、ガスＧの下流側の開口部１３ａの直径よりも小さい。【選択図】図２