| 摘要 |
The invention relates to a liquid-cooled gas sampling probe comprising: a probe tube (2) through which cooling liquid flows and which has an outer casing (13) and an inner casing, at least one tubular filter (19, 20) made of sintered material inside the inner casing (14), wherein measuring gas entering the probe tube (2) through the free end (12) flows inwards through the filter (19, 20) from the outside, at least one measurement chamber (33) having at least one measurement sensor into which the measuring gas enters after flowing through the tubular filter (19, 20), an axially movable ejection plate (16) inside the inner surface (14) near the free end (12) of the probe tube (2), wherein in the measurement operation a narrow annular gap between the ejection plate (16) and the inner surface (14) allows the inflow of measuring gas. In order to reduce contamination of the filter (19, 20) with particles in the measuring gas, a connecting element (18) is arranged between the filter (19, 20) and the ejection plate (16), the diameter of which connecting element is considerably smaller than the internal diameter of the inner casing (14), such that between the connecting element (18) and the inner casing (14) an annular chamber (32) is produced, of which the cross-section is greater than that of the annular gap. |
