JPH0466558U

JPH0466558U -

Info

Publication number: JPH0466558U
Application number: JP11082590U
Authority: JP
Priority date: 1990-10-23
Filing date: 1990-10-23
Publication date: 1992-06-11

Description

[Brief explanation of the drawing]

第１図は本考案一実施例のダストモニタを示す
断面図、第２図は第１図における円板状ろ紙上の
集塵・測定個所とパージ個所の位置を示す平面図
、第３図は本考案の変形例の円板状ろ紙上での集
塵個所、測定個所およびパージ個所を示す平面図
、第４図は従来技術のダストモニタを示す断面図
である。１１……サンプラ本体、１２……空洞部、１３
……集塵部、１４……空気流入路、１５……空気
流出路、１６……検出器格納穴、１７……放射線
検出器、１８……モータ、１９……円板状ろ紙、
２０……パージ用空気導出路、２１……パージ部
、２２……パージ用空気排出路。 Fig. 1 is a sectional view showing a dust monitor according to an embodiment of the present invention, Fig. 2 is a plan view showing the positions of dust collection/measurement points and purge points on the disk-shaped filter paper in Fig. 1, and Fig. 3 is FIG. 4 is a plan view showing a dust collection location, a measurement location, and a purging location on a disk-shaped filter paper according to a modification of the present invention, and FIG. 4 is a sectional view showing a conventional dust monitor. 11...Sampler body, 12...Cavity part, 13
... Dust collection section, 14 ... Air inflow path, 15 ... Air outflow path, 16 ... Detector storage hole, 17 ... Radiation detector, 18 ... Motor, 19 ... Disc-shaped filter paper,
20...Purge air outlet path, 21...Purge section, 22...Purge air discharge path.

Claims

[Claims for Utility Model Registration] (1) An air inflow path that communicates with a dust collection section at one end of the internal cavity, an air outflow path that communicates with the dust collection section, and a detector storage hole that communicates with the cavity. a radiation detector disposed in the detector storage hole with its detection surface facing the cavity; and a radiation detector mounted concentrically on the shaft of a motor disposed in the cavity, and arranged in the dust collecting section and the radiation detector. A disc-shaped filter paper having an area facing the detection surface of the detector, and a part branched from the middle of the air outflow path and directed toward the lower surface of a part approximately 180 degrees away from the part of the disc-shaped filter paper facing the dust collection part. A dust monitor comprising: a purge air outlet passage through which purge air is blown; and a purge air discharge passage which sucks the purge air that has passed through the disc-shaped filter paper and merges it into a downstream portion of the air outlet passage. . (2) The dust monitor according to claim 1, wherein the detector storage hole is provided at a position concentric with the dust collection section. (3) The dust monitor according to claim 1, wherein the detector storage hole is provided at a portion of the disk-shaped filter paper surface that is 90° away from the portion facing the dust collection portion.