US3609382A - Light detector with cleaning and testing means - Google Patents

Light detector with cleaning and testing means Download PDF

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Publication number
US3609382A
US3609382A US850603A US3609382DA US3609382A US 3609382 A US3609382 A US 3609382A US 850603 A US850603 A US 850603A US 3609382D A US3609382D A US 3609382DA US 3609382 A US3609382 A US 3609382A
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US
United States
Prior art keywords
web
tube
light
flame
permits
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
US850603A
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English (en)
Inventor
William J Moore
Donald J L Lin
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.)
Forney Engineering Co
Forney International Inc
Original Assignee
Forney International Inc
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 Forney International Inc filed Critical Forney International Inc
Application granted granted Critical
Publication of US3609382A publication Critical patent/US3609382A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • G01N21/01—Arrangements or apparatus for facilitating the optical investigation
    • G01N21/15—Preventing contamination of the components of the optical system or obstruction of the light path
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/02—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium
    • F23N5/08—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using light-sensitive elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2229/00—Flame sensors
    • F23N2229/06—Flame sensors with periodical shutters; Modulation signals

Definitions

  • sensing elements are provided in the steam generator to detect a loss of flame at the burners.
  • the sensing elements are sensitive to the flame light and are each positioned so that the light from a flame impinges against it. If a burner should lose its flame, a sensing element will either transmit a signal or discontinue signal transmission to shut down the generator or indicate to an operator that the boilerv should be shut down until the defective burner is repaired.
  • a light-sensitive tube is engaged by a belt having a wiper section.
  • the belt is provided with an aperture at the wiper section and an actuating mechanism, to move the section back and forth over the tube to clean it and move the aperture to intermittently block off the flame light to permit the tube to be tested.
  • FIG. 1 is a perspective view of a portion of a light detector assembly made in accordance with the present invention
  • FIG. 2 is a view partly in section in a scale larger than that of FIG. 1 of the present assembly.
  • FIG. 3 is a detailed view of the wiper web and its associated spring used in the assembly ofFlGS. l and 2.
  • the assembly shown in FIG. 1 and designated as includes a base 12 and solid body portions 14 extending forwardly therefrom. Extending forwardly from the body portions 14 are arms 16 which are parallel to the longitudinal axis of the device. Although only one arm 16 can be seen in FIG. 1, another extends parallel to it along the obscured side of the device.
  • a light-sensitive element or tube 18 is mounted at the free ends of arms 16 by means of screws 20, each of which extends through an ear 22. integral with flange 24 of the tube 18.
  • the assembly is positioned in a housing 26 (FIG. 2) which includes a generally cylindrical cover 28 extending outwardly from the base 12 to an annular collar 30 at its opposite end.
  • the annular collar 30 encircles an annular ring 32 which defines an orifice 34 which permits light from the flame 36 to communicate with the tube 18.
  • cooling air moving in the direction of the arrows 38 is forced through the housing 26 and out the orifice 34 to cool the tube 18.
  • the portions 42 and 46 are each reciprocated so that the portion 42 moves forward while the portion 46 moves to the rear and vice versa.
  • This action moves the wiper section 44 and its associated orifice 48 back and forth over the tube 18 so that light from the flame 36 is intermittently blocked off from the tube 18.
  • the tubes sensitivity to the light can be tested during this times, because it will if it is functioning properly, signal alternately the presence and absence of flame light. Movement of the wiper section 44 over the tube 18 will also wipe it clean of soot or other matter which have an adverse effect upon its sensitivity.
  • the matter which is removed from the tube 18 will be blown out of the orifice 34 bythe cooling air moving in the direction of the arrows 38.
  • the web 40 is oscillated by means of linkage which includes an elongated member 50 at the rear end of the straight portion 42 and a coil spring 52 secured to the rear end of the straight portion 46.
  • the rear end of the member 50 includes a hole 54 at which the member 50 is pivoted to a link 56.
  • the link 56 extends generally in a vertical plane, its upper end being pivoted to the member 50 and its lower end being pivoted at a point 58 which is fixed with respect to the body portions 14 of the device 10.
  • the rearward end of the coil spring 52 is also fixed with respect to the body portion 14.
  • the link 56 is pivoted at a point pivot 60 between its ends with a piston rod 62 which extends rearwardly to a piston 64 which is slideably positioned within a cylinder 66.
  • the piston 64 is urged rearwardly by a coil spring 68 which extends in the cylinder 66 around the piston rod 62 and between the piston 64 and a forward wall 70 of the cylinder 66.
  • a coil spring 68 which extends in the cylinder 66 around the piston rod 62 and between the piston 64 and a forward wall 70 of the cylinder 66.
  • a light-detecting apparatus havinga light-detecting element which may be tested and cleaned periodically comprising a flexible web having a wiping section engaging said element, said section having an aperture which permits light to pass through said web and impinge upon said element, and means to move said web in relation to said element so that a portion of it always engages against said element so that light is alternately blocked and allowed to pass through said aper' ture to permit said element to be tested while said web removes soot or other matter from said element.
US850603A 1969-08-15 1969-08-15 Light detector with cleaning and testing means Expired - Lifetime US3609382A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US85060369A 1969-08-15 1969-08-15

Publications (1)

Publication Number Publication Date
US3609382A true US3609382A (en) 1971-09-28

Family

ID=25308612

Family Applications (1)

Application Number Title Priority Date Filing Date
US850603A Expired - Lifetime US3609382A (en) 1969-08-15 1969-08-15 Light detector with cleaning and testing means

Country Status (5)

Country Link
US (1) US3609382A (de)
DE (1) DE2040587C3 (de)
FR (1) FR2058100A5 (de)
GB (1) GB1315357A (de)
NL (1) NL161870C (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3737663A (en) * 1972-03-15 1973-06-05 G Quittner Radiation path termination housing
US3825913A (en) * 1972-03-31 1974-07-23 Electronics Corp America Fuel burner supervisory system
US3973123A (en) * 1974-05-28 1976-08-03 Robert Bosch G.M.B.H. Measuring transparency of gases, particularly the optical transmission of internal combustion engine exhaust gases
US4011448A (en) * 1975-08-08 1977-03-08 Hordeski Michael F Linear shaft encoder
FR2666138A1 (fr) * 1990-08-24 1992-02-28 Pillard Chauffage Detecteur de flamme d'un bruleur.
US5495112A (en) * 1994-12-19 1996-02-27 Elsag International N.V. Flame detector self diagnostic system employing a modulated optical signal in composite with a flame detection signal

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1017844B (it) * 1974-08-02 1977-08-10 Sie Soc It Elettronica Otturatore ottico per la verifica del funzionamento di rivelatori di fiamma
IT1056742B (it) * 1975-11-27 1982-02-20 S I E Otturatore ottico per la verifica del funzionamento di rivelatori di fiamma
FR2394757A1 (fr) * 1977-06-17 1979-01-12 Forney International Perfectionnements aux detecteurs de flamme

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3737663A (en) * 1972-03-15 1973-06-05 G Quittner Radiation path termination housing
US3825913A (en) * 1972-03-31 1974-07-23 Electronics Corp America Fuel burner supervisory system
US3973123A (en) * 1974-05-28 1976-08-03 Robert Bosch G.M.B.H. Measuring transparency of gases, particularly the optical transmission of internal combustion engine exhaust gases
US4011448A (en) * 1975-08-08 1977-03-08 Hordeski Michael F Linear shaft encoder
FR2666138A1 (fr) * 1990-08-24 1992-02-28 Pillard Chauffage Detecteur de flamme d'un bruleur.
ES2044761A2 (es) * 1990-08-24 1994-01-01 Pillard Chauffage Detector de llama de un quemador.
US5495112A (en) * 1994-12-19 1996-02-27 Elsag International N.V. Flame detector self diagnostic system employing a modulated optical signal in composite with a flame detection signal

Also Published As

Publication number Publication date
DE2040587A1 (de) 1971-05-27
DE2040587B2 (de) 1979-08-23
GB1315357A (en) 1973-05-02
NL7012043A (de) 1971-02-17
FR2058100A5 (de) 1971-05-21
NL161870B (nl) 1979-10-15
DE2040587C3 (de) 1980-04-24
NL161870C (nl) 1980-03-17

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