JPH02118855U

JPH02118855U -

Info

Publication number: JPH02118855U
Application number: JP2831689U
Authority: JP
Priority date: 1989-03-13
Filing date: 1989-03-13
Publication date: 1990-09-25

Description

[Brief explanation of drawings]

第１図は本考案の一実施例を示す縦断面図、第
２図、第３図はそれぞれノズル部の変形例を示す
部分拡大図、第４図は第３図の−断面図、第
５図、第６図、第７図はそれぞれ側壁に直角に空
気導入管がチヤンバーに接続される場合のノズル
部分を示す縦断面図、第８図は第１図の受光部の
改良型を示す縦断面図、第９図は第８図における
外部紫外線の反射状況を示す説明図である。第１
０図は公知の多重反射式スモークメーターを示す
縦断面図である。１ａ……光源部、２ａ……受光部、３，４……
反射鏡、６……チヤンバー側壁、７ａ……向空気
導入管、８ａ……向空気導入管、８……ノズル部
、９……空気膜（エアカーテン）。 FIG. 1 is a longitudinal cross-sectional view showing an embodiment of the present invention, FIGS. 2 and 3 are partially enlarged views showing modified examples of the nozzle part, FIG. 4 is a cross-sectional view of FIG. , 6 and 7 are longitudinal cross-sectional views showing the nozzle portion when the air introduction pipe is connected to the chamber at right angles to the side wall, respectively, and FIG. 8 is a longitudinal cross-sectional view showing an improved type of the light receiving section in Fig. 1. The top view and FIG. 9 are explanatory diagrams showing the state of reflection of external ultraviolet rays in FIG. 8. 1st
FIG. 0 is a longitudinal sectional view showing a known multiple reflection type smoke meter. 1a... Light source section, 2a... Light receiving section, 3, 4...
Reflector, 6... Chamber side wall, 7a... Air introduction tube, 8a... Air introduction tube, 8... Nozzle section, 9... Air film (air curtain).

Claims

[Scope of utility model registration request]

Reflecting mirrors are placed on each of the opposing walls that form the chamber into which smoke is introduced, and multiple reflections are performed in which the ultraviolet rays emitted from a light source attached to one wall are reflected multiple times by both reflecting mirrors and then received. In the type smoke meter, a first air introduction nozzle is attached near the upper end of one of the opposing wall surfaces and forms an air curtain that introduces pressurized clean air from the outside and flows downward along the same wall surface; a second air introduction nozzle that is attached near the lower end and that introduces pressurized clean air from the outside to form an air curtain that flows upward along the other wall surface. .