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US20130203335A1 - Device and method for protecting an optical observation opening - Google Patents

Device and method for protecting an optical observation opening Download PDF

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Publication number
US20130203335A1
US20130203335A1 US13/813,577 US201113813577A US2013203335A1 US 20130203335 A1 US20130203335 A1 US 20130203335A1 US 201113813577 A US201113813577 A US 201113813577A US 2013203335 A1 US2013203335 A1 US 2013203335A1
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US
United States
Prior art keywords
diaphragm
purging gas
diaphragm aperture
aperture
nozzle unit
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.)
Abandoned
Application number
US13/813,577
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English (en)
Inventor
Hans-Uwe Morgenstern
Ulrich Oster
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.)
TMT Tapping Measuring Technology GmbH
Original Assignee
TMT Tapping Measuring Technology GmbH
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 TMT Tapping Measuring Technology GmbH filed Critical TMT Tapping Measuring Technology GmbH
Assigned to TMT TAPPING-MEASURING-TECHNOLOGY GMBH reassignment TMT TAPPING-MEASURING-TECHNOLOGY GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MORGENSTERN, HANS-UWE, Oster, Ulrich
Publication of US20130203335A1 publication Critical patent/US20130203335A1/en
Abandoned legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F9/00—Use of air currents for screening, e.g. air curtains
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
    • F23M11/00—Safety arrangements
    • F23M11/04—Means for supervising combustion, e.g. windows
    • F23M11/042—Viewing ports of windows
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D21/00—Arrangement of monitoring devices; Arrangement of safety devices
    • F27D21/02—Observation or illuminating devices
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/42—Constructional features of converters
    • C21C5/46—Details or accessories
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
    • F23M11/00—Safety arrangements
    • F23M11/04—Means for supervising combustion, e.g. windows
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D25/00—Devices or methods for removing incrustations, e.g. slag, metal deposits, dust; Devices or methods for preventing the adherence of slag
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D25/00—Devices or methods for removing incrustations, e.g. slag, metal deposits, dust; Devices or methods for preventing the adherence of slag
    • F27D25/008—Devices or methods for removing incrustations, e.g. slag, metal deposits, dust; Devices or methods for preventing the adherence of slag using fluids or gases, e.g. blowers, suction units
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
    • G02B23/24—Instruments or systems for viewing the inside of hollow bodies, e.g. fibrescopes
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
    • G02B23/24—Instruments or systems for viewing the inside of hollow bodies, e.g. fibrescopes
    • G02B23/2476—Non-optical details, e.g. housings, mountings, supports
    • G02B23/2492—Arrangements for use in a hostile environment, e.g. a very hot, cold or radioactive environment
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/24—Test rods or other checking devices
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/52—Manufacture of steel in electric furnaces
    • C21C2005/5288—Measuring or sampling devices
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/42—Constructional features of converters
    • C21C5/46—Details or accessories
    • C21C5/4673—Measuring and sampling devices
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Definitions

  • the invention relates to a diaphragm device and a method for protecting an optical observation opening, in particular for protecting the observation opening against contaminants from a dirty atmosphere in a blast furnace and the like, having a nozzle unit and a purging gas chamber, wherein the nozzle unit forms a diaphragm aperture for the observation opening and is used for forming a purging gas flow, wherein the purging gas chamber is formed between an optical surface of the observation opening and the diaphragm aperture, and wherein a purging gas is applied to the purging gas chamber and the purging gas can be ducted through the diaphragm aperture into the dirty atmosphere.
  • observation openings For observing an inner chamber of a blast furnace, it is known, for example, to provide observation openings, which allow a look into the blast furnace.
  • an observation opening can be provided with a camera, which continuously films the inner chamber of a blast furnace for transmission to and display in a control room.
  • the camera or also the observation opening itself can have a wide angle aperture, which allows for a comprehensive view into the inner chamber.
  • a diaphragm aperture as small as possible of the observation opening can be realized with a conic aperture angle which substantially corresponds to an aperture angle of a wide angle lens.
  • an optical protective screen is arranged, which has the purpose of protecting a wide angle lens or an observer against adverse heat radiation or dirt particles.
  • the purging gas escaping at high pressure cannot expand quickly enough, generating a negative pressure at a flank of the diaphragm aperture which causes vortices and increasingly draws in dirt particles, which accumulate, for example, in a cone of the diaphragm aperture and, thus, can reduce a field of vision of a lens.
  • all these effects necessitate frequent cleaning of the diaphragm aperture.
  • this problem does not only occur in blast furnaces, but generally in all closed spaces with a dirty atmosphere which can dirty a diaphragm aperture of this kind.
  • the diaphragm device for protecting an optical observation opening, in particular for protecting the observation opening against contaminants from a dirty atmosphere in a blast surface or the like, comprises a nozzle unit and a purging gas chamber, wherein the nozzle unit forms a diaphragm aperture for the observation opening and serves for forming a purging gas flow, wherein the purging gas chamber is formed between an optical surface of the observation opening and the diaphragm aperture, wherein a purging gas is applied to the purging gas chamber and the purging gas can be guided through the diaphragm aperture into the dirty atmosphere, wherein the nozzle unit comprises a flow guiding device which effects or can effect a guiding of the flow of purging gas escaping into the dirty atmosphere.
  • the flow guiding device it becomes possible to form a purging gas flow in such a manner that no negative pressure is formed on a flank of the diaphragm aperture due to the purging gas flow and thus a sucking in of dirt particles is avoided.
  • the purging gas flow is particularly pronounced in the area of an outer diameter of the diaphragm aperture so that a gradual covering of the diaphragm aperture by a frontal deposition of dirt particles is prevented.
  • a flow guiding device is formed in the nozzle unit, which can form a purging gas flow of this kind in the area of the diaphragm aperture.
  • the optical surface can be realized as a simple plane-parallel plate or screen behind which an objective lens is arranged. Also, the optical surface can be formed by a lens of the objective lens itself. In this case, for example, a camera can also be arranged within the purging gas chamber.
  • the purging gas chamber can be formed conic, tapering in the opening direction of the diaphragm aperture. This means, the purging gas chamber can already effect the formation of a purging gas flow which flows in particular along a flank of the diaphragm aperture at relatively high pressure. Also, the conic shape of the purging gas chamber can promote a laminar flow within the purging gas chamber and prevent the formation of vortices.
  • the diaphragm aperture can be formed conic, widening in the opening direction of the diaphragm aperture.
  • a conic diaphragm aperture is particularly advantageous if a wide angle lens is used for observation.
  • An aperture angle of the diaphragm aperture can then substantially correspond to an aperture angle of the lens.
  • the diaphragm aperture can also be formed slit-shaped, cylindrical or with straight flanks.
  • the diaphragm aperture can be supplied with purging gas from all sides and a purging gas can be applied to the optical surface of the observation opening and/or a protective screen from all sides. Also in this way, pressure differences within the nozzle unit, which can lead to undesired turbulences of purging gas, can be prevented to the largest possible extent.
  • annular duct can be formed such that a rotating flow of purging gas in the annular duct can be effected.
  • a rotating flow can, for example, be caused by an eccentric, tangential introduction of purging gas into the annular duct or by lamellas influencing a flow direction.
  • An annular guiding of the purging gas flow as soon as in the annular duct can influence the purging gas flow leaving the diaphragm aperture in such a manner, that it leaves the diaphragm aperture with a twist, that is helically, which facilitates maintaining the cleanliness of the diaphragm aperture.
  • the flow guiding device is formed rotationally symmetric relative to a longitudinal axis of the diaphragm aperture.
  • the nozzle unit can comprise an internal flow guiding device which is formed in such a manner that a helical motion of the purging gas around a longitudinal axis of the diaphragm aperture can be effected.
  • a formation of a negative pressure in the area of flanks and, thus, a deposition of dirt particles can be avoided in this way.
  • the purging gas escaping helically or twisted expands relatively fast in a lateral direction transverse to the longitudinal axis of the diaphragm aperture so that the purging gas flow also touches the flank of the conic diaphragm aperture.
  • the flow guiding device can be arranged between an annular duct and the purging gas chamber.
  • the purging gas can flow into the purging gas chamber from all sides, wherein by means of the flow guiding device the purging gas undergoes an alteration of its flow direction and performs a circular or rotating motion in the purging gas chamber.
  • the internal flow guiding device can also be arranged between an annular duct and the diaphragm aperture. In this way, a rotation of the purging gas flow can then also be formed only in the area of the diaphragm aperture. This can be advantageous if a rotation of the purging gas flow within the purging gas chamber is undesirable.
  • the internal flow guiding device can be arranged between an annular duct and a transition area of the purging gas chamber and the diaphragm aperture.
  • Said transition area can, for example, be a bottle-neck between the purging gas chamber and the diaphragm aperture, within which the internal flow guiding device is arranged.
  • the flow guiding device can be formed by flow ducts whose longitudinal duct axes run transverse relative to the longitudinal axis of the diaphragm aperture, respectively, without intersecting the longitudinal axis.
  • the flow ducts can be oriented relative to the longitudinal axis in such a manner that they enter the purging gas chamber tangentially, for example, so that a rotating purging gas flow is created in the purging gas chamber. It is advantageous as well if the flow ducts are oriented such that purging gas is directly applied to the optical surface so as to effectively preclude a deposition of dirt particles thereon.
  • Said flow ducts can be formed of drill holes or lamellas.
  • the flow guiding device can be formed of one or also of several drill holes which eccentrically lead into the purging gas chamber or the diaphragm aperture or into the transition area in a radial direction.
  • the same effect of a rotating flow can be reached using lamellas. In that case, an even further-reaching influence on a purging gas flow is possible because the lamellas or their effective surface can also be inclined relative to a plane formed by the optical surface.
  • the nozzle unit can comprise an external flow guiding device, which at least forms an annular gap which surrounds the diaphragm aperture and from which purging gas can escape in an annular shape. Accordingly, a purging gas flow escaping through the diaphragm aperture is supplemented by a further purging gas flow, which coaxially surrounds it.
  • This outer purging gas flow has the effect that contaminants depositing on the diaphragm aperture cannot advance into the diaphragm aperture because they cannot pass the annular gap due to the purging gas flow escaping from said gap. Also, a sucking in of dirt particles due to a partial negative pressure in the area of the diaphragm aperture is precluded because the purging gas escaping from the annular gap prevents such an intrusion of dirt particles into the diaphragm aperture as well.
  • the annular gap can be produced particularly easy if the annular gap is formed between an inner and an outer diaphragm ring of the nozzle unit.
  • the nozzle unit can, for example, be formed of two or more diaphragm rings, wherein the outer diaphragm ring has an inner diameter into which the inner diaphragm ring can be inserted at least in portions so that an annular gap is created.
  • the diaphragm rings can be spaced from one another in a vertical direction relative to the longitudinal axis of the diaphragm aperture in such a way that an intermediate space or also an annular duct is formed, through which purging gas can flow into the annular gap.
  • a flow guiding device can be produced particularly easy in this manner.
  • the annular gap can be directly connected to an annular duct. If a rotating purging gas flow is already formed in the annular duct, a rotating motion of the purging gas flow can propagate past the annular gap into the dirty atmosphere and prevent an intrusion of dirt particles into the diaphragm aperture even more effectively due to the thus generated centrifugal forces of the purging gas flow.
  • the annular gap can be formed conic, tapering in the opening direction of the diaphragm aperture. Due to this kind of conic realization of the purging gas flow leaving the annular gap, it becomes possible to concentrate the purging gas flow escaping from the diaphragm aperture so that turbulences, which are caused when the purging gas flow enters the dirty atmosphere, are displaced to a relatively large distance from the diaphragm aperture. By such an influencing or different realization of an exit angle of the purging gas flow from the annular gap, the position, shape and dimension of the vortices in the dirty atmosphere can be influenced. Also, an approach of dirt particles to the diaphragm aperture can be reduced.
  • a gap duct of the annular gap can be formed such that it tapers in the opening direction of the diaphragm aperture.
  • a particularly good protective effect for the diaphragm aperture can be achieved if the annular gap is arranged directly on an outer diameter of the diaphragm aperture. Accordingly, the annular gap can be located directly in a transition area between an outer edge of the diaphragm aperture or of a flank and a front side adjacent thereto of a diaphragm ring or a chamber wall.
  • the annular gap can be located directly in a transition area between an outer edge of the diaphragm aperture or of a flank and a front side adjacent thereto of a diaphragm ring or a chamber wall.
  • other positions for forming the annular gap within the flank or at a distance from the diaphragm aperture on the front side are conceivable as well.
  • the method according to the invention for protecting an optical observation opening is implemented using a nozzle unit and a purging gas chamber, wherein the nozzle unit forms a diaphragm aperture for the observation opening and serves for forming a purging gas flow, wherein the purging gas chamber is formed between an optical surface of the observation opening and the diaphragm aperture, wherein a purging gas is applied to the purging gas chamber and the purging gas is guided through the diaphragm aperture into the dirty atmosphere, wherein the nozzle unit comprises a flow guiding device by means of which a guiding of the flow of purging gas escaping into the dirty atmosphere takes place.
  • FIG. 1 shows a perspective sectional view of a blast furnace
  • FIG. 2 shows a longitudinal sectional view of a diaphragm aperture according to the state of the art
  • FIG. 3 shows a longitudinal sectional view of a diaphragm aperture with an embodiment of a flow guiding device
  • FIG. 4 shows a longitudinal sectional view of a diaphragm device
  • FIG. 5 shows a cross-sectional view of the diaphragm device of FIG. 4 ;
  • FIG. 6 shows a perspective sectional view of the diaphragm device
  • FIG. 7 shows a further perspective sectional view of the diaphragm device
  • FIG. 8 shows a perspective view of a nozzle unit
  • FIG. 9 shows a top view of the nozzle unit
  • FIG. 10 shows a longitudinal sectional view of the nozzle unit
  • FIG. 11 shows a top view of a further nozzle unit
  • FIG. 12 shows a longitudinal sectional view of a further nozzle unit.
  • FIG. 1 shows a blast furnace 10 with an inner chamber 11 , a burden 12 and a dirty atmosphere 13 located above the burden 12 in the inner chamber 11 .
  • a camera 15 is arranged on an observation opening with a diaphragm device, both not being illustrated.
  • the camera 15 comprises a wide angle lens—not visible either—with which a picture of the inner chamber 11 can be filmed, said picture being located in a field of vision 16 or an aperture angle of the wide angle lens.
  • FIG. 2 shows a diaphragm aperture 17 according to the state of the art with a conic flank 19 formed relative to a longitudinal axis 18 .
  • a purging gas flow 20 is indicated here with arrows. Since the purging gas flow 20 leaves the diaphragm aperture 17 at high pressure and, thus, an expansion of the purging gas in a dirty atmosphere 21 cannot take place completely in the diaphragm aperture 17 , a negative pressure forms in an area 22 of the flank 19 , which generates a flow 23 , indicated with arrows, in the dirty atmosphere 21 .
  • Dirt particles not illustrated here are carried along by the flow 23 from the dirty atmosphere 21 along a front side 24 of a diaphragm ring 25 into the diaphragm aperture 17 and, as illustrated, swirled in the area 22 or carried away by the purging gas flow 20 .
  • a deposition of dirt particles on the flank 19 and on the front side 24 in the proximity of the area 22 takes place.
  • so many dirt particles can accumulate, that the diaphragm aperture 17 is gradually covered and an aperture angle is reduced.
  • FIG. 3 shows a diaphragm opening 26 , which is formed conic and rotationally symmetric to a longitudinal axis 27 and has an aperture angle ⁇ .
  • the aperture angle ⁇ corresponds to an aperture angle of a wide angle lens not illustrated here on an observation opening.
  • the diaphragm opening 26 thus forms a flank 28 , which ends in an outer diameter d on a front side 29 of an outer diaphragm ring 30 .
  • an external flow guiding device 31 is further arranged, which is formed as a conic gap duct 32 and rotationally symmetric to the longitudinal axis 27 with an annular gap 33 .
  • a helical purging gas flow 34 indicated by an arrow enters into a dirty atmosphere 35 .
  • the purging gas flow 34 expands immediately during the escape from the diaphragm aperture 26 due to the thus generated centrifugal forces in such a manner that no negative pressure can be generated between the purging gas flow 34 and the flank 28 or that the purging gas flow 23 brushes the flank 28 .
  • An internal flow guiding device for generating the helical purging gas flow 34 is not illustrated here.
  • the external flow guiding device 31 generates a further purging gas flow 36 , which is also indicated with arrows.
  • the purging gas flow 36 leaves the annular gap 33 directly at the outer diameter d in the direction of the longitudinal axis 27 and coincides with the purging gas flow 34 .
  • a thus generated negative pressure in the area of the front side 29 causes the formation of a flow 37 indicated by arrows in the dirty atmosphere 35 .
  • Dirt particles, which are brought along by the flow 37 and are not illustrated here, are carried away by the purging gas flow 36 before they ever reach the area of the diaphragm aperture 26 .
  • dirt particles may be deposited at the front side 29 , a covering of the diaphragm aperture 26 is not possible because deposited dirt particles cannot pass the annular gap 33 or the purging gas flow 36 .
  • FIGS. 4 to 7 show a diaphragm device 38 in different illustrations with the diaphragm aperture 26 according to the preceding description of FIG. 3 .
  • the diaphragm device 38 serves for protecting an observation opening 39 with a wide angle lens 40 and a camera not illustrated here.
  • a purging gas chamber 43 is formed between an optical surface 41 of a protective screen 42 of the observation opening 39 and the diaphragm aperture 26 .
  • the purging gas chamber 43 is conic and rotationally symmetric relative to the longitudinal axis 27 , tapering towards the opening direction of the diaphragm aperture 26 and formed by an inner diaphragm ring 44 .
  • the inner diaphragm ring 44 is screwed together with a support 45 of the protective screen 42 such that between the inner diaphragm ring 44 and the outer diaphragm ring 30 , an annular duct 46 is formed.
  • Purging gas made up of nitrogen is supplied at high pressure through a supply duct 47 to the annular duct 46 .
  • a rotating purging gas flow indicated by arrows 48 is formed by means not illustrated here.
  • the internal flow guiding device 49 is formed of a plurality of passage drill holes 50 in the inner diaphragm ring 44 , wherein the passage drill holes 50 are arranged with their longitudinal axes 51 in a horizontal direction transverse to the longitudinal axis 27 in such a manner that the longitudinal axes 51 do not intersect the longitudinal axis 27 .
  • the inner diaphragm ring 44 is inserted into the outer diaphragm ring 30 in such a way that between the diaphragm rings 30 and 44 , the gap duct 32 with the annular gap 33 is formed.
  • the gap duct 32 tapers starting from the annular duct 46 in the direction of the diaphragm aperture 26 .
  • the gap duct is formed conic an inclined in the direction of the longitudinal axis 27 .
  • FIGS. 8 to 10 A combined view of FIGS. 8 to 10 shows a nozzle unit 53 of a diaphragm device not illustrated here.
  • the nozzle unit 53 forms a diaphragm aperture 54 formed substantially conic, wherein passage drill holes 55 are arranged such that they exit within a flank 56 of the diaphragm aperture 54 .
  • Longitudinal duct axes 57 of the passage drill holes 55 run transverse relative to a longitudinal axis 58 of the diaphragm aperture 54 without intersecting it.
  • the passage drill holes 55 run parallel and offset to one another by a distance a relative to a longitudinal sectional plane 59 of the nozzle unit 53 .
  • the passage drill holes 55 are arranged offset from one another by an angle ⁇ .
  • FIGS. 11 and 12 A combined view of FIGS. 11 and 12 shows a further embodiment of a nozzle unit 60 , wherein here, passage drill holes 61 are arranged in the area of a bottleneck 62 between a diaphragm aperture 63 and a purging gas chamber 64 which is only partially illustrated.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Astronomy & Astrophysics (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Cleaning In General (AREA)
  • Lens Barrels (AREA)
  • Blast Furnaces (AREA)
US13/813,577 2010-09-29 2011-08-29 Device and method for protecting an optical observation opening Abandoned US20130203335A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP10182444.9 2010-09-29
EP10182444.9A EP2437021B1 (de) 2010-09-29 2010-09-29 Vorrichtung und Verfahren zum Schutz einer optischen Beobachtungsöffnung
PCT/EP2011/064838 WO2012041620A1 (de) 2010-09-29 2011-08-29 Vorrichtung und verfahren zum schutz einer optischen beobachtungsöffnung

Publications (1)

Publication Number Publication Date
US20130203335A1 true US20130203335A1 (en) 2013-08-08

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US13/813,577 Abandoned US20130203335A1 (en) 2010-09-29 2011-08-29 Device and method for protecting an optical observation opening

Country Status (8)

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US (1) US20130203335A1 (ru)
EP (1) EP2437021B1 (ru)
JP (1) JP2013545062A (ru)
KR (1) KR20130140615A (ru)
CN (1) CN103154653B (ru)
BR (1) BR112013007529A2 (ru)
RU (1) RU2559613C2 (ru)
WO (1) WO2012041620A1 (ru)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
WO2020083531A1 (en) * 2018-10-22 2020-04-30 Arcam Ab Method and device for viewing and/or illuminating a target surface in an evacuated chamber having condensable vapor therein

Families Citing this family (1)

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Publication number Priority date Publication date Assignee Title
CN110361863A (zh) * 2019-07-16 2019-10-22 中国航发沈阳发动机研究所 一种油气观察组件

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CN103154653B (zh) 2015-11-25
WO2012041620A1 (de) 2012-04-05
EP2437021B1 (de) 2013-05-01
JP2013545062A (ja) 2013-12-19
RU2013111680A (ru) 2014-11-10
RU2559613C2 (ru) 2015-08-10
EP2437021A1 (de) 2012-04-04
KR20130140615A (ko) 2013-12-24
BR112013007529A2 (pt) 2016-07-19

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