US3377957A - Fusible plug assemblies for hydraulic turbo-couplings - Google Patents

Fusible plug assemblies for hydraulic turbo-couplings Download PDF

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Publication number
US3377957A
US3377957A US57647066A US3377957A US 3377957 A US3377957 A US 3377957A US 57647066 A US57647066 A US 57647066A US 3377957 A US3377957 A US 3377957A
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US
United States
Prior art keywords
fusible plug
coupling
assembly
outlets
discharge
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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English (en)
Inventor
Bilton John
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.)
Fluidrive Engineering Co Ltd
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Fluidrive Engineering 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 Fluidrive Engineering Co Ltd filed Critical Fluidrive Engineering Co Ltd
Application granted granted Critical
Publication of US3377957A publication Critical patent/US3377957A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D9/00—Couplings with safety member for disconnecting, e.g. breaking or melting member
    • F16D9/02—Couplings with safety member for disconnecting, e.g. breaking or melting member by thermal means, e.g. melting member
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D33/00—Rotary fluid couplings or clutches of the hydrokinetic type
    • F16D33/18—Details
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/1624—Destructible or deformable element controlled
    • Y10T137/1797—Heat destructible or fusible
    • Y10T137/1812—In fluid flow path

Definitions

  • a fusible plug assembly for a hydraulic turbo-coupling is formed with a discharge passage which is normally closed by a fusible plug and has its inlet in communication with the interior of the working circuit of the coupling.
  • the discharge passage terminates in a plurality of discharge openings which extend transversely of the passage and are of sufficiently small cross section to prevent the fusible plug from being ejected therethrough vhen the fusible plug is released in substantially unmelted orm.
  • the present invention relates to fusible plug assemblies for hydraulic turbo-couplings.
  • Such fusible plug assemblies act as overload protective devices for the couplings and are formed with a discharge passage which is blocked by a body of a low melting-point alloy of predetermined melting point.
  • the fusible assemlbly usually consists of a threaded plug having a discharge opening extending through it, the body of low melting-point alloy being cast in the discharge opening, the head of the plug being accessible from the exterior of the coupling.
  • the exterior of the coupling is forcibly air-cooled, as for example by a separate fan or blower
  • the fusible plug is screwed into the radially inner end of a discharge tube which itself is screwed into the coupling and has a head accessible from the outside of the coupling, the fusible plug assembly in this case consisting of the fusible plug and the discharge tube.
  • a fusible plug assembly according to the present invention has a discharge passage extending axially of the assembly and terminating in a discharge outlet discharging substantially radially of the assembly.
  • This arrangement prevents the low-melting point alloy from being ejected as a single mainly solid body as may occur when the discharge passage discharges radially.
  • heat is transferred from the wall of the discharge passage into the body of alloy so that the periphery of the alloy tends to be the first part to melt and the whole body of alloy may become,
  • Fusing of the fusible plug may be caused by prolonged running with the driven load stalled or when the motor is switched oif after it is observed that the load has been stalled for some time whereupon the cooling effect is reduced as the casing slows down but further heat is being transferred to the fusible plug.
  • the fusible plug assembly has more than one discharge outlet discharging radial-1y of the assembly. This makes it more difiicult to thwart the operation of the assembly by hammering plugs into the outlets as compared with the case where the assembly has only a single outlet discharging axially of the assembly and thus radially of the coupling.
  • pilot vent which is normally closed when the fusible plug assembly is screwed fully home and which is uncovered as the assembly is unscrewed and before there is any risk of the assembly becoming separated from the coupling.
  • the pilot vent may conveniently be in the form of an axial groove cut in the screw threads of the fusible plug assembly, Preferably the groove does not extend to the root of the screw-threaded portion of the assembly, so that when the latter is screwed fully home, the co-operating threads in the coupling casing substantially blank olf the pilot vent.
  • FIG. 1 shows in axial section part of a traction coupling which is forcibly air-cooled by an external fan
  • FIG. 2 is an axially sectional view of a fusible plug assembly for mounting in the periphery of the casing of a traction coupling which is not forcibly air-cooled but runs in a free atmosphere, and
  • FIG. 3 is a view in the direction of the arrow III in FIG. 2.
  • the traction coupling shown in FIG. 1 comprises vaned impeller and runner members 1 and 2 which together define a toridal working circuit 3 for the working liquid.
  • An impeller casing 4 surrounds both the elements 1 and 2 and is secured to the impeller 1 for rotation therewith.
  • a filling tube 5 Welded to the impeller casing 4 is a filling tube 5, the outlet end of which is normally closed by a fusible plug assembly 7 with a sealing washer 8 under the hexagon head 9 of the fusible plug assembly 7.
  • the head 9 carries a discharge tube 10 extending radially of the coupling and is formed with three discharge outlets 11 perpendicular to the tube 10 and lying at angles of to each other. Alternatively, there may be an even number of outlets 11 arranged in diametrically opposed pairs to permit the passage of a tommy bar therethrough.
  • a fusible plug 12 is screwed into the threaded inner end of the tube 12 with a sealing washer 13 between the head of the fusible plug and the inner end of the tube 10.
  • a bore 14 extends through the plug 12 and is normally blocked by a body 16 of low melting-point alloy.
  • the body 16 may be press fitted in the bore which may then be tapered in the direction such that centrifugal force urges the body towards the narrower end of the bore.
  • the fusible plug 12 is of larger dimensions than the cross section of the outlets 11 and is therefore incapable of passing through any of these outlets in substantially unmolten form.
  • the screw-threaded portion of the shank 17 of the head 9 is formed with an axial groove 18 acting as a pilot vent which is normally sealed off from the outside by the sealing washer 8 but allows a slow discharge of any gas or vapour under pressure in the coupling when the head 9 is unscrewed about a turn.
  • the fusible plug assembly 7 shown in FIGS. 2 and 3 can replace the fusible plug assembly shown in FIG. 1 when the exterior of the casing 4 is not forcibly air-cooled.
  • Parts of the assembly 7' corresponding to parts of the assembly 7 are indicated by the same reference numeral primed.
  • the assembly 7 has an axial discharge passage 19 terminating in three discharge outlets 11.
  • the body 16' of low melting-point alloy is cast in the region of the junction of the passage 19 and outlets 11 and extends at 20 a short distance into the outlets 11 to provide a firm an chorage for the body 16' against accidental displacement.
  • the body 16 may be pressed into the passage 19 until it begins to extrude at 20 into the outlets 11 to provide firm anchorage for the body 16 against accidental displacement but without affecting the eutectic properties of the fusible metal.
  • the passage 19 may be tapered to provide a wedging action further securing the body 16'. Clearly the body 16' cannot pass through the outlets 11' in the unmolten state.
  • the outlets could be ar ranged in diametrical alignment with the fusible body 16' spaced from the outlets so as to enable a tommy bar to be passed right through the outlets.
  • a fusible plug assembly for obturating the duct, said assembly comprising a body having a head and shank, said body being formed with a discharge passage leading from an inlet in said shank at the end thereof remote from said head, said head being formed with a plurality of discharge outlets extending transversely frOm the outlet end of said passage to discharge orifices in the peripheral surface of said head, a plug of fusible material in said discharge passage between said inlet and said dis-charge outlets, said plug fusibly obturating said passage, said plug being of dimensions rendering it incapable of passing through any of said discharge outlets in substantially unmolten form.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pressure Vessels And Lids Thereof (AREA)
  • Safety Valves (AREA)
US57647066 1965-09-03 1966-08-31 Fusible plug assemblies for hydraulic turbo-couplings Expired - Lifetime US3377957A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3779765A GB1093304A (en) 1965-09-03 1965-09-03 Fusible plug assemblies for hydraulic turbo-couplings

Publications (1)

Publication Number Publication Date
US3377957A true US3377957A (en) 1968-04-16

Family

ID=10399067

Family Applications (1)

Application Number Title Priority Date Filing Date
US57647066 Expired - Lifetime US3377957A (en) 1965-09-03 1966-08-31 Fusible plug assemblies for hydraulic turbo-couplings

Country Status (5)

Country Link
US (1) US3377957A (enrdf_load_stackoverflow)
AT (1) AT264221B (enrdf_load_stackoverflow)
BE (1) BE686357A (enrdf_load_stackoverflow)
GB (1) GB1093304A (enrdf_load_stackoverflow)
NL (1) NL145646B (enrdf_load_stackoverflow)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3436916A (en) * 1967-10-02 1969-04-08 John Edward Becker Hydraulic couplings
US3450202A (en) * 1968-01-25 1969-06-17 Gray Tool Co Petroleum well thermally activated safety relief device for differential pressure closing tubing safety valve
US3735773A (en) * 1970-04-03 1973-05-29 Thune Eureka As Pneumatic temperature releaser
US4220439A (en) * 1978-03-13 1980-09-02 The Garrett Corporation Pneumatic starter overtemperature control
US4339916A (en) * 1978-03-13 1982-07-20 The Garrett Corporation Pneumatic starter overtemperature control
WO1983001100A1 (en) * 1981-09-14 1983-03-31 Beson, John Fusible plug for fire safe valve
US6280142B1 (en) * 1999-12-20 2001-08-28 United Technologies Corporation Pressure relief device for a propeller hub
US20040226682A1 (en) * 2002-10-30 2004-11-18 Jan Ehrhard Emergency cooling system for a thermally loaded component
US6840040B1 (en) * 1998-01-26 2005-01-11 Voith Tubro Gmbh & Co. Kg Hydrodynamic coupling
US20070251228A1 (en) * 2003-12-23 2007-11-01 Voith Turbo Gmbh & Co Closure with a Thermal Safeguard Function
WO2010003485A1 (de) * 2008-07-08 2010-01-14 Voith Patent Gmbh Verschluss mit thermischer sicherungsfunktion für eine hydrodynamische maschine
CN102808916A (zh) * 2012-08-27 2012-12-05 泰富重工制造有限公司 液力耦合器过温保护装置及其修复方法

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
HU189137B (en) * 1982-05-12 1986-06-30 Budapesti Mueszaki Egyetem,Hu Hydrodynamic transmission machinery the transmission medium of which are incombustible fluid based on water, oil or synthetic fluid
US5398794A (en) * 1993-06-02 1995-03-21 Horton Industries, Inc. Overheating protection device for rotational control apparatus
DE102004012736A1 (de) * 2004-03-15 2005-10-06 A. Friedr. Flender Ag Schmelzsicherung für eine hydrodynamische Kupplung
DE102019205003A1 (de) * 2019-04-08 2020-10-08 Zf Friedrichshafen Ag Schmelzventil für ein Leitungssystem zur Bewirkung einer Schutzfunktion einer Komponente

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1401002A (en) * 1921-04-13 1921-12-20 Charles H Smith Safety relief-valve for hot-water systems
US1694777A (en) * 1926-04-07 1928-12-11 Sands Mfg Company Valve
US1773401A (en) * 1927-10-20 1930-08-19 Luther D Lovekin Fusible-plug water release
US2983102A (en) * 1957-08-20 1961-05-09 Sinclair Harold Hydraulic turbo couplings

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1401002A (en) * 1921-04-13 1921-12-20 Charles H Smith Safety relief-valve for hot-water systems
US1694777A (en) * 1926-04-07 1928-12-11 Sands Mfg Company Valve
US1773401A (en) * 1927-10-20 1930-08-19 Luther D Lovekin Fusible-plug water release
US2983102A (en) * 1957-08-20 1961-05-09 Sinclair Harold Hydraulic turbo couplings

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3436916A (en) * 1967-10-02 1969-04-08 John Edward Becker Hydraulic couplings
US3450202A (en) * 1968-01-25 1969-06-17 Gray Tool Co Petroleum well thermally activated safety relief device for differential pressure closing tubing safety valve
US3735773A (en) * 1970-04-03 1973-05-29 Thune Eureka As Pneumatic temperature releaser
US4220439A (en) * 1978-03-13 1980-09-02 The Garrett Corporation Pneumatic starter overtemperature control
US4339916A (en) * 1978-03-13 1982-07-20 The Garrett Corporation Pneumatic starter overtemperature control
WO1983001100A1 (en) * 1981-09-14 1983-03-31 Beson, John Fusible plug for fire safe valve
GB2153493A (en) * 1981-09-14 1985-08-21 Smith International Fusible plug for fire safe valve
US6840040B1 (en) * 1998-01-26 2005-01-11 Voith Tubro Gmbh & Co. Kg Hydrodynamic coupling
US6280142B1 (en) * 1999-12-20 2001-08-28 United Technologies Corporation Pressure relief device for a propeller hub
US7077622B2 (en) * 2002-10-30 2006-07-18 Alstom Technology Ltd. Emergency cooling system for a thermally loaded component
US20040226682A1 (en) * 2002-10-30 2004-11-18 Jan Ehrhard Emergency cooling system for a thermally loaded component
US20070251228A1 (en) * 2003-12-23 2007-11-01 Voith Turbo Gmbh & Co Closure with a Thermal Safeguard Function
US7716925B2 (en) * 2003-12-23 2010-05-18 Voith Turbo Gmbh & Co. Closure with a thermal safeguard function
CN1898478B (zh) * 2003-12-23 2012-01-04 福伊特涡轮机两合公司 具有热保险功能的封闭装置
WO2010003485A1 (de) * 2008-07-08 2010-01-14 Voith Patent Gmbh Verschluss mit thermischer sicherungsfunktion für eine hydrodynamische maschine
CN102089543A (zh) * 2008-07-08 2011-06-08 沃依特专利有限责任公司 用于液力机器的具有热安全功能的封闭装置
US20110185718A1 (en) * 2008-07-08 2011-08-04 Harald Hoffeld Closure with thermal safety function for a hydrodynamic machine
US8904775B2 (en) 2008-07-08 2014-12-09 Voith Patent Gmbh Closure with thermal safety function for a hydrodynamic machine
CN105221591A (zh) * 2008-07-08 2016-01-06 福伊特专利有限公司 具有旋转的初级齿轮和旋转或固定的次级齿轮的液力机器
CN102808916A (zh) * 2012-08-27 2012-12-05 泰富重工制造有限公司 液力耦合器过温保护装置及其修复方法
CN102808916B (zh) * 2012-08-27 2014-11-19 泰富重工制造有限公司 液力耦合器过温保护装置及其修复方法

Also Published As

Publication number Publication date
BE686357A (enrdf_load_stackoverflow) 1967-02-15
AT264221B (de) 1968-08-26
NL6612232A (enrdf_load_stackoverflow) 1967-03-06
NL145646B (nl) 1975-04-15
GB1093304A (en) 1967-11-29

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