US3554144A - Furnace sealing door - Google Patents
Furnace sealing door Download PDFInfo
- Publication number
- US3554144A US3554144A US840433A US3554144DA US3554144A US 3554144 A US3554144 A US 3554144A US 840433 A US840433 A US 840433A US 3554144D A US3554144D A US 3554144DA US 3554144 A US3554144 A US 3554144A
- Authority
- US
- United States
- Prior art keywords
- door
- furnace
- flange
- heat
- cylinders
- 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
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J3/00—Processes of utilising sub-atmospheric or super-atmospheric pressure to effect chemical or physical change of matter; Apparatus therefor
- B01J3/03—Pressure vessels, or vacuum vessels, having closure members or seals specially adapted therefor
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0006—Details, accessories not peculiar to any of the following furnaces
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J13/00—Covers or similar closure members for pressure vessels in general
- F16J13/22—Covers or similar closure members for pressure vessels in general with movement parallel to the plane of the opening
Definitions
- FIG. 8 is a view similar to FIG; 7, showing the door just as it is about to be raised into opened position;
- FIG. 9 is an enlarged sectional view of the structure encircled in FIG. 4.
- the reference numeral 2 designates a heattreating furnace-easing shown as of substantially cylindrical shape and havinga sealed outwardly dished rear end wall 2, and the novel door 3 of this invention closing theopen front thereof, the furnace l being'shown supported upon a frame 4.
- the door 3 is "outwardly dished, as especially shown in FIG. 4 for withstanding pressures, and is provided with a peripheral flanges that is welded to a relatively heavy has been-muse fullwater cooling of the entire door or gate,
- a v v The principal 'objectof theipres'ent invention is to provide a novel vertically rising doorto conserve floor space and that is mechanized ⁇ to"1be compatible with automatic-cycling and capable of directly facing a hot chamber without distortion, seal failure; or excessive heat loss,..regardles S 59f vacuum or pressure conditions withintheffurhaee: itself.
- a feature of the'inv'ention is to provide a novel vertically rising furnace, doorthat israised and lowered by use of pneusteel ring or flange 60f substantially rectangular'cross section.
- the flange 6 is provided with'an internal annular groove for accommodating a retainirig ring or washer 7 (see also FIG.
- the present invention is to provide a door that is elevated wheri;open', jthus greatly reducing any chance of accidental damage to ,the 'seal of the door. which is great saving-in, floorv space requirements asextra space is' not required for door motion (such as is necessary for swinging doors).
- Another feature of the present invention is to provide water-cooling channels ing the door nandabuttingfurnace flange without the necessity of cooling the entire door, the said coolin ehannels' being"'cleanable, which greatly extends the service: life of the equipmentin adverse conditions where untreated water is used forcooling, I
- Still another feature of thepresent invention is to provide a furnace door of the above character that "incorporates insulated constructionfor reducingheat loss to a small fraction of that permitted bythe usual water-cooled vacuum gate door or valve, the said door having its -'surface facing the heat so fabricated-as to accommodate differential expansion due to carried thereby, the elevated door when-opened providing a .ing from variable heating of the furnace itself.
- the inner face of the flange 6 of the door is highly finished and provided with an annular keystdne-shaped groove 11 for receiving a sealing O-ring 12 that is adapted to abut the highly finished and smooth surface of a-complementary heavy casing ring or flange 13 fixed upon the'jfu'rnace"casingZ.
- the O- ring 12 serves to seal'the two rings 6 and I3 against the ingress and egress of gases, thus enabling t'hefumace casing 2 to be held at a high internal l vacuum or at a desired pressure therewithin.
- these rings are provided with annular grooves l4 through which water is circulated as through entrance and exit passagesIS. Since the cooling water may not be clean, the grooves 14 are shown closed by elastic rings 16, such as 0- rings, which in turn are retained in place by metallic bands 17. By removing the bands 17, the elastic rings 16 can be removed and the passages 14 cleaned at will,
- the door 3 is provided at its sides'with upper and lower rollers 18 and 19, the rollers'l8 being rotatably supported on the door 3 substantiallymidway of the height thereof, while the lower rollers 19 are rotatably supported on brackets 20 projecting outwardly from the lower portion of the door.
- the two upper rollers 18 of the door slidably engage in grooves 21 provided in the vertically extending sides '22 of a hollow rectangular door frame structure 23.
- the lower rollers 19 of the door 3 are adapted to slidably engage in grooves 24 provided in the sides 22 ofthe door frame structure 23.
- This door frame structure serves to guide the 'doorin its vertical travel
- FIG. 1 shows'a front elevation 'a furnace equipped with the.”
- FIG. 2 is-a viewtaken along line 2-2 of FIG. 1;
- FIG. 3 is a partial sectional view taken substantially along line 3-3 of FIG. 1',
- FIG. 6 is an enlarged fragmentary viewofa portion of the structure of FIG. 1, with parts'broken away;
- FIG. 7 is a fragmentary side elevation view of the furnace door'and associatedstructure, showing the door in closed a position
- .bellcrank levers 29 are pivotally connected by pins 32 to the lower ends of pneumatic cylinders 33 positioned at the sides of the door 3 and extending substantially vertically, said cylinders being supported by the levers 29.
- the rods 34 of pistons 35 I. movable within cylinders 33 are connected at their upper ends by pivot pins'41 exteriorly of the cylinders to brackets 36 attached to the door 3 for supporting the latter.
- the two cylinders 33 (see FIGS. 1 and 2) are connected adjacent their FIG. 10' is an enlarged view taken along line 10-10 of F IG.-
- This motion of the bellcrank levers causes supporting pins 27 to move the lower end of the door frame structure outwardly, as shown in FIG. 8, to produce a space between the ring members 6 and 13, bearing in mind that the upper side portions of the door frame structure are turnable on pivots carried by the furnace.
- the pivoting motion of the levers 29 ceases, and the pneumatic pressure within the lower portions of the cylinders will then act to raise the pistons 35 and piston rods 34, thus acting through pivot pins 41 to raise the door with the rollers 18 and 19 riding in their respective guide grooves 21 and 24 until the pistons 35 reach the top of their respective cylinders, in which position the door is fully opened.
- the door frame structure is preferably inclined slightly forwardly extending from its lower to its upper portion so that as the door rises it will separate the flange rings 6 and 13 to a greater extent throughout their lengths to prevent injury to the O-ring 12 when the door moves upwardly.
- pivot pins 27 are closer to supporting pin 30than pins 32 are to this pin, the pressure ofthe cylinders obtain a mechanical advantage, firmly pressing the door against the furnace. Even after the two flanges 6 and 13 are in full engagement, the cylinders 33 are not completely retracted, so that these cylinders apply a force on the door amplified by the mechanical advantage of the levers 29 to effectively clamp the door, making possible sealing against both positive and vacuum pressures within the furnace.
- a heat-treating furnace having a casing with a door opening provided with a casing flange surrounding such opening, a vertically moving door provided with a complementary flange having a sealing gasket adapted for abutting the furnace flange to seal the furnace in use, a door frame structure surrounding and guiding said door in its vertical movement, the upper portion of said door frame structure being pivotally supported upon the furnace, bellcrank levers pivotally supported upon the lower portion of the furnace and having the first of their two arms slidingly and pivotally connected to the lower portion of said door frame structure, and actuating cylinders with internal pistons, said cylinders being pivotally connected at their lower ends to the second of the arms of said bellcrank levers, said pistons extending upwardly and having upwardly extending piston rods projecting outwardly of said cylinders and pivotally connected to said door for raising and lowering the same, said actuating cylinders and pistons acting in conjunction with the weight of the door when opening the latter to actuate said bellcrank levers upon
- a heat-treating furnace as defined in claim 1 comprising stop members carried by the first-named arms of said bellcrank levers to limit the outward movement of the door frame structure and hence of the door, the first-named bellcrank lever arms connected to said door frame structure being shorter than the second-named arms supporting said cylinders and pistons, the closing of the door effected by supplying pres sure fluid to the upper end portions of said cylinders to depress said pistons serving to move the door downwardly at a controlled rate depending upon the pressure of the cushioning fluid below said pistons, the pressure fluid above said pistons acting upon the termination of the downward movement of the door to force said cylinders upwardly somewhat and actuate said bellcrank levers to move the door against the furnace casing, the mechanical advantage provided by the first-named shorter arms of said bellcrank levers serving to force said door flange-sealing gasket tightly against the furnace casing flange, thereby sealing the furnace against both vacuum and positive internal fluid pressures.
- roller guides for guiding the door provided in said door frame structure, a pair of upper rollers positioned substantially at the midheight of the door for guiding the lattei" in one of said roller guides, and a pair of lower rollers positioned substantially at the bottom-of the door for movement in another of said roller guides,'and stop members fixed in a said upper roller guides for limiting the'downwardmovement of the door so that the flange thereof is opposite said fumace flange when the door is in its lowest position.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Organic Chemistry (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
Abstract
Description
Claims (6)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US84043369A | 1969-07-09 | 1969-07-09 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3554144A true US3554144A (en) | 1971-01-12 |
Family
ID=25282367
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US840433A Expired - Lifetime US3554144A (en) | 1969-07-09 | 1969-07-09 | Furnace sealing door |
Country Status (1)
Country | Link |
---|---|
US (1) | US3554144A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20040093801A1 (en) * | 2002-11-15 | 2004-05-20 | Steris Inc. | Door assembly for sealing a chamber |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2827864A (en) * | 1955-06-01 | 1958-03-25 | American Gas Furnace Co | Self-seating furnace cover |
US2910022A (en) * | 1955-12-30 | 1959-10-27 | American Radiator & Standard | Cupola door |
US3298546A (en) * | 1964-09-01 | 1967-01-17 | Robert E Jones | Door operator for a tunnel kiln ceramic plant |
-
1969
- 1969-07-09 US US840433A patent/US3554144A/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2827864A (en) * | 1955-06-01 | 1958-03-25 | American Gas Furnace Co | Self-seating furnace cover |
US2910022A (en) * | 1955-12-30 | 1959-10-27 | American Radiator & Standard | Cupola door |
US3298546A (en) * | 1964-09-01 | 1967-01-17 | Robert E Jones | Door operator for a tunnel kiln ceramic plant |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20040093801A1 (en) * | 2002-11-15 | 2004-05-20 | Steris Inc. | Door assembly for sealing a chamber |
US7121042B2 (en) * | 2002-11-15 | 2006-10-17 | Steris Inc. | Door assembly for sealing a chamber |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: FIRST PENNSYLVANIA BANK N A 19TH FL.CENTRE SQ WEST Free format text: SECURITY INTEREST;ASSIGNOR:SELAS CORPORATION OF AMERICA A CORP OF PA;REEL/FRAME:003997/0981 Effective date: 19820217 |
|
AS | Assignment |
Owner name: SELAS CORPORATION OF AMERICA A CORP. OF PA Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:FIRST PENNSYLVANIA BANK N.V., FOR ITSELF AND AS AGENT FOR THE PHILADELPHIA NATIONAL BANK;REEL/FRAME:004096/0520 Effective date: 19821231 |
|
AS | Assignment |
Owner name: BANCBOSTON FINANCIAL COMPANY,MASSACHUSETTS Free format text: SECURITY INTEREST;ASSIGNOR:SELAS CORPORATION OF AMERICA;REEL/FRAME:004557/0143 Effective date: 19860529 Owner name: BANCBOSTON FINANCIAL COMPANY, 100 FEDERAL STREET, Free format text: SECURITY INTEREST;ASSIGNOR:SELAS CORPORATION OF AMERICA;REEL/FRAME:004557/0143 Effective date: 19860529 |
|
AS | Assignment |
Owner name: SELAS CORPORATION OF AMERICA, PENNSYLVANIA Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:BANCBOSTON FINANACIAL COMPANY A MA TRUST;REEL/FRAME:004945/0988 Effective date: 19880805 Owner name: SELAS CORPORATION OF AMERICA, DRESHER, PA 19025 A Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:BANCBOSTON FINANACIAL COMPANY A MA TRUST;REEL/FRAME:004945/0988 Effective date: 19880805 |