US2935909A - Detectors of oil mists and the like - Google Patents

Detectors of oil mists and the like Download PDF

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Publication number
US2935909A
US2935909A US728009A US72800958A US2935909A US 2935909 A US2935909 A US 2935909A US 728009 A US728009 A US 728009A US 72800958 A US72800958 A US 72800958A US 2935909 A US2935909 A US 2935909A
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US
United States
Prior art keywords
duct
window
chamber
gas
cuff
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US728009A
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English (en)
Inventor
Mathisen Anders
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Graviner Manufacturing Co Ltd
Original Assignee
Graviner Manufacturing Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Graviner Manufacturing Co Ltd filed Critical Graviner Manufacturing Co Ltd
Application granted granted Critical
Publication of US2935909A publication Critical patent/US2935909A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/47—Scattering, i.e. diffuse reflection
    • G01N21/49—Scattering, i.e. diffuse reflection within a body or fluid
    • G01N21/53—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke
    • G01N21/534—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke by measuring transmission alone, i.e. determining opacity

Definitions

  • the present invention provides a detector of oil mist and the like comprising a chamber having an inlet for gas which may carry such mist, a window in one wall of said chamber, a second window in another wall of said chamber, a duct extending from a position adjacent but spaced from said first Window to a position adjacent but spaced from said second window, a cuff surrounding said first window, said cuff extending through an opening in said duct with the periphery of said cuff spaced from said opening, a second cuff surrounding said second window and extending tates atent 2,935,909 Patented May 10, 1960 first cuff, said duct having a second opening therein into which said second cuff extends, the area of said second opening being greater than the cross-sectional area of said second cuff, an outlet for gas located in said duct at a position between the two openings, and means for mounting a light source behind one window for projecting light through said duct onto a photo-electric cell mounted behind
  • Figure l is a side view, partly in section, of the first construction of oil mist detector
  • Figure 2 is an end view, partly in section of the detector shown in Figure 1, and
  • Figure 3 is a side View of the second construction of oil mist detector.
  • FIG. 1 it will be seen that this construction of detector is generally similar to that shown in Figures 1 to 3 of the drawings accompanying the aforesaid patent specification.
  • a monitoring chamber 10 through which gas, which may be carrying oil mist, is drawn by means of a suction fan 11 through a suction pipe 12 the inlet 12a of which is connected to the source which is to be monitored.
  • Windows 13 and 14 are provided on opposite sides of the monitoring chamber 10 and an electric lamp 15 is mounted behind thewindow 14 to project light across the chamber 10 through the window 13 onto a photo-electric cell 16 of the vacuum tube type which is mounted behind the window 13. To compensate for temperature and voltage changes, the output of the cell I into the monitoring chamber 10.
  • the invention further provides a detector of oil mist chamber 10 a rectangular cross-section duct 23 is fitted which overlaps the end of each of the culfs 21, 22 but does not extend to the walls of the monitoring chamber 10.
  • a rectangular cross-section duct 23 is fitted which overlaps the end of each of the culfs 21, 22 but does not extend to the walls of the monitoring chamber 10.
  • an arcuate vortex shield 24 is provided within the duct 23 and overlapping the upper side of each of the cuffs 21, 22, this shield 24 being secured along its centre line to each of the cuffs 21, 22 and having a larger radius of curvature than the radius of the cufis 21, 22.
  • An outlet tube 25 extends from an opening in the top of the duct 23 to the inlet of the fan 11.
  • a door 23a is provided in' the side of the duct 23 and, if desired, a window (not shown) can also be provided in the side of the duct 23 to allow observation through a corresponding window 26a provided in a removable closure plate 26 which is removed to give access to the door 23a.
  • the gases or vapours from the inlet elbow pipe 12 pass into the duct 23 through its open ends around the sides of the cuffs 21, 22 and this results in a horizontal gas or vapour column in front of the windows 13, l l'which can result in an improved sensitivity to obscuration of the light column.
  • the gases and vapours leave the duct 23 by passing around the edges of the vortex shield 24 and into the outlet tube 25 leading to the fan 11. It is found that where there was previously astendencyto form a .vortexwithin. the. monitoring chamber 10, any vortex will now be formed in the tube 25 above the vortex shield 24. It has also been found that with such anarrangement thetendency; forsolids to.
  • thesecond construction of oil mistdetector is arranged to draw: gas-from the -space-tobemonitored, for example, the crankcase of an engine, via Zthe inlet at by .having 3the -outlet 31.0011- nected to a suction source; ;in the case ofanqen'gine the latter may be the induction systemg in. which, case no J opens into aycylindrical, monitoring chamber 32 in which a cylindrical i duct 133,, -of;.-,sm all er diameter than the chamber 32 and of shorter length, is rnounted coaxnially relative to the chamber 32. ,;At eachend of the monitoring chamber 32, windows 34 and 35 are provided,
  • the cell 38 is a'barrier layer cell
  • gas is drawn ,in through the inlet 30 and passes towards each end of the chamber 32 through the annular space between the ,chamben32 and the duct 33, thence around the ends 33a and- 33b respectively and through the annular spaces between the cuff-39 and mouth 33a on'the onehand, and thecuif 40 and the mouth-33b on theother hand, and
  • the output of the cell 35 may normally be balanced bythe output, from a similar cell which is located so that, its illumination isnot, affected by the presence. of oil mist.
  • a detector accordingto claim 1 wherein said plate is of arcuate cross-section with its convex surface facing away from the gas outlet in said duct.
  • a detector of oil mist and the like comprising a chamber having a plurality of walls, one of said walls having therein an inlet for gas which maycarry such rnist, a first'window, said window being mounted in one ofsaid Walls, a'second window, said second window being mounted' in a different one of said walls from that in which said first window is mounted, a first cuff surroundmg said first window and projecting into said chamber,
  • Ysaid'duct having an outlet for gas located in the upper 35. surface of said, duct at a position between the two openings, means fonmounting aphoto-electric cell behind one window, means'for'mounting a light source behind the .other'window for projecting light through said duct onto said photoelectric cell, a suction fan, said suction fan 40 having a suction inlet, said suction inlet being connected to said duct outlet,. and a vortex deflector plate, said vortex deflector. plate being mounted in said duct adjacent. but spaced from the upper surface thereof, said deflectorplate extending across the full extent of said duct. outletwhereby any vortex producedby said suction :fanis located on the side ofthe" deflector plate facing into said gas outlet.

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Optical Measuring Cells (AREA)
US728009A 1957-04-18 1958-04-11 Detectors of oil mists and the like Expired - Lifetime US2935909A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB345752X 1957-04-18

Publications (1)

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US2935909A true US2935909A (en) 1960-05-10

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ID=10367325

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US728009A Expired - Lifetime US2935909A (en) 1957-04-18 1958-04-11 Detectors of oil mists and the like

Country Status (5)

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US (1) US2935909A (ko)
BE (1) BE566806A (ko)
CH (1) CH345752A (ko)
DE (1) DE1076968B (ko)
GB (1) GB831011A (ko)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3020795A (en) * 1959-05-14 1962-02-13 Du Pont Fluid inspection apparatus
US3268734A (en) * 1963-09-30 1966-08-23 Stewart Warner Corp Oil mist fluid monitor
US3319069A (en) * 1964-08-27 1967-05-09 American District Telegraph Co Smoke detecting radiation sensitive fire alarm system
US3504183A (en) * 1966-09-12 1970-03-31 Iit Res Inst Particle counter using a variable test volume

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR726484A (fr) * 1930-11-19 1932-05-30 Siemens Ag Indicateur de la densité de fumées
US2042095A (en) * 1933-05-08 1936-05-26 Kidde & Co Walter Detection of suspended matter in gaseous fluids
GB704052A (en) * 1952-05-07 1954-02-17 Anglo Iranian Oil Co Ltd Improvements in or relating to smokemeters
US2770162A (en) * 1952-06-05 1956-11-13 Specialties Dev Corp Apparatus for visually detecting suspended matter in fluid

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE661589C (de) * 1930-11-19 1938-06-22 Siemens & Halske Akt Ges Rauchdichtemesser

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR726484A (fr) * 1930-11-19 1932-05-30 Siemens Ag Indicateur de la densité de fumées
US2042095A (en) * 1933-05-08 1936-05-26 Kidde & Co Walter Detection of suspended matter in gaseous fluids
GB704052A (en) * 1952-05-07 1954-02-17 Anglo Iranian Oil Co Ltd Improvements in or relating to smokemeters
US2770162A (en) * 1952-06-05 1956-11-13 Specialties Dev Corp Apparatus for visually detecting suspended matter in fluid

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3020795A (en) * 1959-05-14 1962-02-13 Du Pont Fluid inspection apparatus
US3268734A (en) * 1963-09-30 1966-08-23 Stewart Warner Corp Oil mist fluid monitor
US3319069A (en) * 1964-08-27 1967-05-09 American District Telegraph Co Smoke detecting radiation sensitive fire alarm system
US3504183A (en) * 1966-09-12 1970-03-31 Iit Res Inst Particle counter using a variable test volume

Also Published As

Publication number Publication date
BE566806A (ko)
DE1076968B (de) 1960-03-03
GB831011A (en) 1960-03-23
CH345752A (fr) 1960-04-15

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