• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The threaded connection between a graphite shaft (1) and a metal shaft (2), such as is used to drive a rotating nozzle in the refining of aluminum, is strengthened by coating the graphite surface that contact the flange portion of the metal shaft prior to the fastening of said shafts together. The coating of said graphite shaft serves to greatly strengthen the threaded connection and the ability of said connection to transmit driving torque from the metal shaft to the graphite shaft.
    公开号:SU1627092A3
    申请号:SU874202621
    申请日:1987-05-14
    公开日:1991-02-07
    发明作者:Франклин Пелтон Джон
    申请人:Юнион Карбид Корпорейшн (Фирма)；
    IPC主号:
    专利说明:

    The invention relates to mechanical engineering and can be used to connect elements operating at elevated temperatures and made of materials with various coefficients of thermal linear expansion, for example, graphite and metal shafts.
    The purpose of the invention is to increase the reliability of the connection.
    The drawing shows the proposed threaded connection.
    The graphite shaft 1 is made with an internal thread associated with a threaded section made on the outer surface of the metal shaft 2
    3. The shafts have a common axis 4. During operation, the metal shaft 2 rotates in the direction indicated by arrow 20 5, which helps tighten the threaded connection. The metal shaft 2 is made with a flange part 6, the supporting surface 7 of which is in contact with the end portion 8 of the graphite 25 shaft 1 during the connection of the shaft 2 with the shaft 1 in the hole 9 of the graphite shaft.
    An increase in the torsional strength of the threaded joint is achieved jq due to the use of a thin layer of refractory cement 10 on the upper end 8 of the graphite shaft 1 in that part that contacts the supporting surface 7 of the metal shaft 2, when these two shafts are connected to one another by a threaded joint. The coating of the thin layer 10 is allowed to dry completely before the assembly of the two said shafts. Thus, cement binds to the graphite surface, and not to the supporting surface 7 of the flange of the metal shaft. A significant increase in the ability of a threaded connection to transfer torque. torque compared to a threaded joint obtained without the use of a coating is caused by a significant increase in the coefficient of friction between the refractory coating on the graphite surface and the metal surface of the indicated flange portion 6 of the metal shaft compared to the friction between the untreated graphite surface and the flange of the metal shaft in a traditional metal-graphite connection .
    Refractory cement contains 70% alumina together with ground fibers and particles, as well as a small amount of aluminum-organic production to improve its binding characteristics in a water-based binder composition. For convenience, the entire upper end face of the graphite shaft 1 may be covered, i.e. upper torus ^ q 8. However, to achieve the goal, it is sufficient to cover only a part of the indicated upper end 8, which is in contact with the lower surface 7 of the indicated metal flange 6.
    The coating on the specified upper end of graphite is usually carried out in two steps with time intervals between them from 1/6 to 1/2 min. A certain amount of the binder phase of the first coating is absorbed by the porous structure of the graphite being coated and the use of the second coating is used to replace such absorbed material. The coating is allowed to air dry before bonding, and this does not require any special drying or firing.
    The coating used in practice usually has a thickness of 1.2-1.4 mm when the cement used is subjected to preliminary grinding and screening, and the thickness is 1.4-
    1.9 mm when cement is used in the form in which it is supplied by manufacturers. The indicated thickness values are measured above the initial graphite surface. There may be some penetration of the coating material into the pores of the graphite, and therefore the total thickness of the coating is greater than the value indicated on some parts of the treated surface.
    In the connection, an external thread on a graphite shaft and a protrusion for contacting an end face of a metal shaft made with an internal thread can be made. In this case, the coating is carried out on a smooth surface of the protrusion of the graphite part.
    In refractory cement compositions, sodium silicate is used as a binder, silica is used to make the mixture thick and easy to apply on the graphite surface, it also prevents the incrustation
    27O <’2 phyto shaft in contact with. supporting, surface of the flange part of the metal-binding fluid from the coating under the action of capillary forces of the porous structure of graphite. Powdered alumina provides the desired high frictional characteristics. The refractory cement used in the practical embodiment of the invention should include a powdery material, the individual particles of which should not melt. to crush or break down under operating conditions, the binder phase that holds such particles and binds them to graphite, moreover, the specified binder must maintain strength under operating conditions, the combination of the specified powdery material and the binder phase must have an easily distributed shape, and the specified cement should have limited absorption of the liquid binder phase with respect to the porous structure of graphite. The coating thickness may vary to some extent depending on the characteristics of the particular coating in each particular application, usually a coating thickness of 0.5-2 mm is considered satisfactory.
    Coating the contact surface of graphite appreciably strengthens the threaded connection between the shafts, resulting in significantly increased load capacity of such a connection when transmitting torque. The present invention allows to significantly improve the strength of the metal-graphite compound in torsion without any radical structural changes or increase the size of the shafts, to increase resistance to shock loads.
    权利要求:
    Claims (7)
    [1]
    Claim
    1. A threaded connection containing a graphite shaft with an internal thread, a metal shaft with an external thread, a part of the front surface of the graphical shaft during tightening, and 5 and 5, characterized in that, in order to increase reliability, a specified part of the end surface of the graphite shaft is coated material whose friction coefficient together with the metal shaft material is greater than the coefficient of friction of the graphite shaft material paired with the metal shaft material.
    [2]
    2. Connection by π. 1, about t l and -
    15 characterized in that a thin layer of refractory cement is used as a coating.
    [3]
    3. Connection pop. 1, characterized in that the coating
    20 contains alumina.
    [4]
    4. The compound according to claim 1, wherein the coating is made in the form of alumina alumina 25 dispersed in a binder based on water with an alumina content of 70%.
    [5]
    5. The compound according to claim 1 ,. characterized in that the coating is made with a thickness of 0.5-2.0 mm
    thirty
    [6]
    6. A method for threadedly connecting graphite and metal shafts by screwing a threaded portion of a metal shaft into a threaded hole of a graphite shaft to connect the end of the graphite shaft to the surface of the flanged part of the metal deposit, characterized in that, in order to increase reliability, before screwing back 40 g . The graphite shaft is coated and dried.
    [7]
    7. The method of pop. 6, characterized in that the coating is dried in air.
    45 8. The method according to PP.6-7, characterized in that the coating is produced in two stages, the second stage is carried out after absorption of part of the binder by the porous structure
    50 graphite.
    类似技术:
    公开号 | 公开日 | 专利标题
    SU1627092A3|1991-02-07|Threaded joint and method of making same
    CA1233836A|1988-03-08|Composition and method for forming a protectivecoating on carbon-carbon substrates
    US4045608A|1977-08-30|Friction facing with porous sheet base
    US4792361A|1988-12-20|Cementitious composite friction compositions
    US5478642A|1995-12-26|Resin-based friction material comprising aramid, acrylic and carbon fibers in a phenolic resin binder
    US4471023A|1984-09-11|Enhancement coating and process for carbonaceous substrates
    DE3505562C1|1986-08-21|Flat plastic gasket, especially for internal combustion engines
    US4612240A|1986-09-16|Thermally matched coatings for ceramic fiber insulation
    US5085536A|1992-02-04|Strengthened graphite-metal threaded connection
    FR2544303A1|1984-10-19|CURABLE COMPOSITION, PROCESS FOR IMPLEMENTING THE SAME, AND APPLICATION IN PARTICULAR TO THE BONDING OF ORIFICES
    US4364994A|1982-12-21|Process and composition for minimizing accumulation of moisture on a cold surface exposed to humid conditions and product obtained thereby
    US5434211A|1995-07-18|Heat-curable adhesive
    US5830309A|1998-11-03|Resin-based friction material
    CN87103425A|1987-12-02|Noise elimination lining material and with this material preparation noise elimination method of lining
    WO1990009970A1|1990-09-07|Process for coating a continuous casting tundish with a refractory material
    EP0362437B1|1993-05-05|Strengthened graphite-metal threaded connection
    DE3149485A1|1983-06-30|Pitch-bonded unfired refractory bricks
    RU1838679C|1993-08-30|Graphite shaft and method of connecting in with metal shaft
    CA1312473C|1993-01-12|Strengthened graphite-metal threaded connection
    SU1194993A1|1985-11-30|Method of rendering taper-threaded joints of pipes fluid-tight
    US4729689A|1988-03-08|Electrode member and process for the production thereof
    JPH06229434A|1994-08-16|Wet type friction material
    RU2086592C1|1997-08-10|Rust converter
    EP0047701B1|1984-05-02|Process for the production of heat-protection material, especially for rocket elements, and material obtained thereby
    CN107793162B|2021-09-07|Degradable soluble ceramic fiber daub and use method thereof
    同族专利:
    公开号 | 公开日
    JPS6326317A|1988-02-03|
    EP0246564A1|1987-11-25|
    DE3767027D1|1991-02-07|
    US4685822A|1987-08-11|
    AT59442T|1991-01-15|
    GR3001243T3|1992-07-30|
    NO872019D0|1987-05-14|
    JPH029093B2|1990-02-28|
    NO872019L|1987-11-16|
    CA1291351C|1991-10-29|
    ES2019328B3|1991-06-16|
    EP0246564B1|1990-12-27|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    FR464504A|1913-11-06|1914-03-24|Heinrich Hempel|Trim, soft metal, for threads of hard metal screws|
    US2079692A|1933-10-16|1937-05-11|Francis J Lapointe|Broach shank connecter|
    US2102214A|1934-11-06|1937-12-14|Arthur L Parker|Art of preventing seizure of contacting surfaces of soft alloys and like materials|
    FR797616A|1935-11-12|1936-05-01|Kattowitzer Aktien Ges Fuer Be|Method to prevent seizure in threads|
    DE1032606B|1955-05-24|1958-06-19|Siemens Ag|Connection of parts made of ceramic with parts made of metal by screwing|
    US2879092A|1957-12-13|1959-03-24|Gen Electric|Friction shaft-coupling assembly|
    US3893496A|1972-03-02|1975-07-08|Oakland Corp|Friction coating and sealant for threaded parts|
    US4040610A|1976-08-16|1977-08-09|Union Carbide Corporation|Apparatus for refining molten metal|
    US4419925A|1978-06-15|1983-12-13|Toyota Jidosha Kogyo Kabushiki Kaisha|Assembled piston for engine|
    US4191486A|1978-09-06|1980-03-04|Union Carbide Corporation|Threaded connections|
    SE425120B|1979-01-10|1982-08-30|Skf Nova Ab|PRESSURE-POWERED FRICTION COUPLING|
    US4362419A|1980-07-28|1982-12-07|Plessey Overseas Limited|Couplings|
    JPH0357281B2|1982-01-20|1991-08-30|
    US4598899A|1984-07-10|1986-07-08|Kennecott Corporation|Light gauge metal scrap melting system|US5085536A|1986-05-15|1992-02-04|Union Carbide Industrial Gases Technology Corp.|Strengthened graphite-metal threaded connection|
    GB2291948B|1988-02-03|1996-06-26|Vickers Shipbuilding & Eng|Improvements in or relating to structures subject to loading|
    EP0362437B1|1988-10-07|1993-05-05|Praxair Technology, Inc.|Strengthened graphite-metal threaded connection|
    JP2512323B2|1988-10-13|1996-07-03|ユニオン・カーバイト・コーポレーション|Reinforced graphite-metal screw joint|
    JPH03122689U|1990-03-22|1991-12-13|
    US5108025A|1991-05-20|1992-04-28|Gte Laboratories Incorporated|Ceramic-metal composite article and joining method|
    US5718416A|1996-01-30|1998-02-17|Pyrotek, Inc.|Lid and containment vessel for refining molten metal|
    US6846779B1|2000-03-24|2005-01-25|Omnitechnik Mikroverkapselungsgesellschaft Mbh|Coating compositions having antiseize properties for a disassemblable socket/pin and/or threaded connections|
    US7906068B2|2003-07-14|2011-03-15|Cooper Paul V|Support post system for molten metal pump|
    US7470392B2|2003-07-14|2008-12-30|Cooper Paul V|Molten metal pump components|
    US20050013715A1|2003-07-14|2005-01-20|Cooper Paul V.|System for releasing gas into molten metal|
    US7402276B2|2003-07-14|2008-07-22|Cooper Paul V|Pump with rotating inlet|
    US20070253807A1|2006-04-28|2007-11-01|Cooper Paul V|Gas-transfer foot|
    US8366993B2|2007-06-21|2013-02-05|Cooper Paul V|System and method for degassing molten metal|
    US9410744B2|2010-05-12|2016-08-09|Molten Metal Equipment Innovations, Llc|Vessel transfer insert and system|
    US9205490B2|2007-06-21|2015-12-08|Molten Metal Equipment Innovations, Llc|Transfer well system and method for making same|
    US9156087B2|2007-06-21|2015-10-13|Molten Metal Equipment Innovations, Llc|Molten metal transfer system and rotor|
    US8613884B2|2007-06-21|2013-12-24|Paul V. Cooper|Launder transfer insert and system|
    US9643247B2|2007-06-21|2017-05-09|Molten Metal Equipment Innovations, Llc|Molten metal transfer and degassing system|
    US8337746B2|2007-06-21|2012-12-25|Cooper Paul V|Transferring molten metal from one structure to another|
    US9409232B2|2007-06-21|2016-08-09|Molten Metal Equipment Innovations, Llc|Molten metal transfer vessel and method of construction|
    US8449814B2|2009-08-07|2013-05-28|Paul V. Cooper|Systems and methods for melting scrap metal|
    US10428821B2|2009-08-07|2019-10-01|Molten Metal Equipment Innovations, Llc|Quick submergence molten metal pump|
    US8444911B2|2009-08-07|2013-05-21|Paul V. Cooper|Shaft and post tensioning device|
    US8535603B2|2009-08-07|2013-09-17|Paul V. Cooper|Rotary degasser and rotor therefor|
    US9108244B2|2009-09-09|2015-08-18|Paul V. Cooper|Immersion heater for molten metal|
    US8524146B2|2009-08-07|2013-09-03|Paul V. Cooper|Rotary degassers and components therefor|
    US8714914B2|2009-09-08|2014-05-06|Paul V. Cooper|Molten metal pump filter|
    US9903383B2|2013-03-13|2018-02-27|Molten Metal Equipment Innovations, Llc|Molten metal rotor with hardened top|
    US9011761B2|2013-03-14|2015-04-21|Paul V. Cooper|Ladle with transfer conduit|
    US10052688B2|2013-03-15|2018-08-21|Molten Metal Equipment Innovations, Llc|Transfer pump launder system|
    US10138892B2|2014-07-02|2018-11-27|Molten Metal Equipment Innovations, Llc|Rotor and rotor shaft for molten metal|
    US10947980B2|2015-02-02|2021-03-16|Molten Metal Equipment Innovations, Llc|Molten metal rotor with hardened blade tips|
    US10267314B2|2016-01-13|2019-04-23|Molten Metal Equipment Innovations, Llc|Tensioned support shaft and other molten metal devices|
    US11149747B2|2017-11-17|2021-10-19|Molten Metal Equipment Innovations, Llc|Tensioned support post and other molten metal devices|
    法律状态:
    2007-09-20| REG| Reference to a code of a succession state|Ref country code: RU Ref legal event code: MM4A Effective date: 20050515 |
    优先权:
    申请号 | 申请日 | 专利标题
    US06/863,615|US4685822A|1986-05-15|1986-05-15|Strengthened graphite-metal threaded connection|
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