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EP0434204B1 - Heating of bearing and the like - Google Patents

Heating of bearing and the like Download PDF

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Publication number
EP0434204B1
EP0434204B1 EP90312365A EP90312365A EP0434204B1 EP 0434204 B1 EP0434204 B1 EP 0434204B1 EP 90312365 A EP90312365 A EP 90312365A EP 90312365 A EP90312365 A EP 90312365A EP 0434204 B1 EP0434204 B1 EP 0434204B1
Authority
EP
European Patent Office
Prior art keywords
core
power supply
article
induction heater
winding
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
EP90312365A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0434204A1 (en
Inventor
George William Tyler
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0434204A1 publication Critical patent/EP0434204A1/en
Application granted granted Critical
Publication of EP0434204B1 publication Critical patent/EP0434204B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/101—Induction heating apparatus, other than furnaces, for specific applications for local heating of metal pieces
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating

Definitions

  • This invention relates to induction heaters for heating ring-like articles such as bearings and the like which are required to be located over shafts, pipes and the like.
  • Induction heating is well known in the art and has conventionally been achieved by means of apparatus which constitutes a primary winding of a transformer with the bearing ring forming the secondary winding. This is accomplished by providing a horseshoe construction for the primary winding and having a connecting piece to complete the circuit, the connecting piece being adapted to receive the bearing in inductive contact.
  • induction heaters are presently in use. Their use, however, is limited by several disadvantages derived from the fact that induction heating presently involves passing a high-power current, often of several kilowatts, through an inducting coil to effect high heat in conducting metal; and the primary winding is generally of normal supply frequency and is generally of substantial size which makes it difficult to transport.
  • Another disadvantage associated with prior art arrangements is that the bearing requires to be demagnetised during or after the heating operation.
  • an induction heater for ring-like articles includes a clamp-like magnetically permeable core having a hinged portion moveable between an open and a closed position, the core permitting mounting of an article to be heated around a portion of the core when the core is in the open position; a winding surrounding the core for energising it, the winding forming the primary of a transformer system with the article forming the secondary of the transformer system; and a power supply connected to the primary winding surrounding the core, the induction heater being characterised in that the power supply is a switched mode high frequency power supply operating at a sufficiently high frequency so that low magnetic flux density is produced in the core and the article to avoid the need for demagnetising the article after it has been inductively heated.
  • the core comprises a ferrite material.
  • One important advantage of the present invention is that due to the novel use of high frequency which may be generated by a compact high frequency generator, it can be made as a very small unit which is easily transportable.
  • the high frequency current used which involves low flux density in the core and bearing and in which the oscillations die gradually due to the resonant mode of operation, means that little or no magnetisation takes place and a demagnetisation step is avoided.
  • British Patent GB-A-1 454 783 discloses induction heating equipment for heating metallic rings such as bearings, the equipment comprising a C-shaped core which constitutes a primary coil with a flat surface of the body portion of the equipment.
  • the flat surface receives a bearing and when current is passed through the body and cores a magnetic flux part is created through the bearing.
  • This induced magnetism must, after the heating and subsequent step, be removed and it is an object of the present invention to provide equipment which avoids the necessity for the removal of magnetism in the bearing, which can be a problem.
  • a primary coil 10 is provided on ferrite cores 12, which are hinged at 14 to enable a bearing or other ring-like article to be fitted over either point A or point B.
  • the primary coil 10 is associated with a switch mode power supply 40, and is connected to this by means of connector 16.
  • a diagrammatic view of the housing for the switch mode power supply 40, is shown in Figure 4 and a block diagram of the circuit is shown in Figure 5.
  • the ferrite cores 12 are enclosed in a heat resistant and non-electrically conductive housing 13.
  • two temperature sensitive I.C.'s 18 are mounted on a spring clamp 20; one measures the temperature of the bearing, the other measures the ambient or reference temperature.
  • the two I.C.'s 18 are associated with the switch mode power supply 40 and are connected to it by means of connector 22.
  • the switch mode power supply 40 is housed, in this embodiment of the invention, in an aluminium case 24.
  • the primary coil 10 is connected via socket 26 and the temperature sensors 18 are connected via socket 28.
  • the mains supply is connected through switch 30 and fuse 32. Temperature control of the sensors 18 is effected by means of a potentiometer 34.
  • the switch mode power supply 40 is activated by push button 36 and an indication of the active state is made by the LED 38.
  • the mains current to the circuit of the switched mode power supply 40 is rectified at 42 and smoothed using electrolytic capacitors 44 to produce a smooth DC current.
  • This supply is then used to power a self-oscillating inverter circuit 46, the exact frequency of which is regulated by a control circuit 48, (the inclusion of such a circuit will be obvious to those skilled in the art).
  • the resulting high voltage and high frequency current is then supplied to the primary coil 10, which then heats up a load 50, that is to say a bearing or other ring-like article, which is in inductive contact.
  • a ferrite core was selected which was suitable for use at frequencies of 20KHZ.
  • Type Philips A320 KP 9012 was used of size 94mm in length, 27mm in width and 16mm in thickness and several were assembled together to form the heater as shown i Figure 1. These were wound with 15 turns of 2 x 1mm copper wire.
  • An auxiliary circuit is included to cause the main circuit to run at a frequency that produces a power factor of 1 in the primary coil 10. This is to ensure that maximum power is always delivered to the load 50. (Under variable load conditions the power factor could change causing reduced power in the bearing or ring). This circuit also has the function of causing the transistors to switch at zero current, thus reducing losses in them.
  • Variable temperature settings are obtainable by means of the control 34 and at the set temperature point, automatic switch off of the switch mode power supply 40 is effected together with an audible buzzer. Measurement of the temperature rise can be shown using a liquid crystal display.
  • a safety circuit will disable the switch mode power supply thereby inhibiting activation of said supply.
  • the invention allows high inductive heating with low power input.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Induction Heating (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Heat Treatment Of Articles (AREA)
EP90312365A 1989-12-18 1990-11-13 Heating of bearing and the like Expired - Lifetime EP0434204B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA899658 1989-12-18
ZA899658 1989-12-18

Publications (2)

Publication Number Publication Date
EP0434204A1 EP0434204A1 (en) 1991-06-26
EP0434204B1 true EP0434204B1 (en) 1994-09-07

Family

ID=25579947

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90312365A Expired - Lifetime EP0434204B1 (en) 1989-12-18 1990-11-13 Heating of bearing and the like

Country Status (13)

Country Link
EP (1) EP0434204B1 (es)
JP (1) JPH03194881A (es)
KR (1) KR0171051B1 (es)
AR (1) AR247324A1 (es)
AT (1) ATE111292T1 (es)
AU (1) AU622056B2 (es)
BR (1) BR9006377A (es)
CA (1) CA2029600C (es)
DE (1) DE69012298T2 (es)
NO (1) NO178520C (es)
NZ (1) NZ236123A (es)
PT (1) PT96225B (es)
TW (1) TW215140B (es)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100333436B1 (ko) * 2000-05-16 2002-04-25 이진희 베어링 유도가열기
EP1404911A1 (de) * 2001-05-25 2004-04-07 Barmag AG Galette
JP4549142B2 (ja) * 2004-09-21 2010-09-22 俊男 若松 エンジン
US9012819B2 (en) * 2008-09-30 2015-04-21 Aktiebolaget Skf Bearing heater
RU2525234C2 (ru) * 2012-08-01 2014-08-10 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Комсомольский-на-Амуре государственный технический университет" (ФГБОУ ВПО "КнАГТУ") Теплогенерирующий электромеханический преобразователь
TWI551194B (zh) * 2014-01-06 2016-09-21 Bearing heater
CN105290711A (zh) * 2015-11-16 2016-02-03 耒阳新达微科技有限公司 一种高效节能的轴承加热器
US11215411B2 (en) 2016-10-17 2022-01-04 Electric Horsepower Inc. Induction heater and vaporizer
CN110769537A (zh) * 2019-11-02 2020-02-07 泰州市汇顶机械制造有限公司 一种组合式轴承加热器

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1097059B (de) * 1959-10-12 1961-01-12 Kugelfischer G Schaefer & Co Verfahren zum elektrisch-induktiven Erwaermen von Metallringen
US3895295A (en) * 1972-09-18 1975-07-15 Illinois Tool Works Wattsecond sensing circuit
GB1454783A (en) * 1973-06-23 1976-11-03 Rotary Electrical Co Ltd Induction heating equipment
US4311896A (en) * 1979-06-04 1982-01-19 Yugen Kaisha Parusu Giken Heating apparatus for annular bearings and rings
US4521659A (en) * 1979-08-24 1985-06-04 The United States Of America As Represented By The Administrator Of The National Aeronautics & Space Administration Induction heating gun
EP0027306B1 (en) * 1979-08-24 1985-04-17 UNITED STATES GOVERNMENT, as represented by THE NATIONAL AERONAUTICS AND SPACE ADMINISTRATION Induction heating apparatus and method of securing two workpieces or sheets
SE439718B (sv) * 1983-10-21 1985-06-24 Spm Instr Ab Induktionsvermare for vermning av ringformade produkter, serskilt rullningslager

Also Published As

Publication number Publication date
NO905463D0 (no) 1990-12-18
TW215140B (es) 1993-10-21
KR910013978A (ko) 1991-08-08
CA2029600A1 (en) 1991-06-19
NZ236123A (en) 1994-02-25
PT96225B (pt) 1998-10-30
KR0171051B1 (ko) 1999-05-01
AU622056B2 (en) 1992-03-26
ATE111292T1 (de) 1994-09-15
CA2029600C (en) 1996-06-11
AR247324A1 (es) 1994-11-30
EP0434204A1 (en) 1991-06-26
DE69012298T2 (de) 1995-05-04
NO178520B (no) 1996-01-02
PT96225A (pt) 1992-08-31
AU6590690A (en) 1991-06-20
DE69012298D1 (de) 1994-10-13
JPH03194881A (ja) 1991-08-26
NO178520C (no) 1996-04-10
NO905463L (no) 1991-06-19
BR9006377A (pt) 1991-09-24

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