US3739465A - Method of making an electromagnetic device - Google Patents

Method of making an electromagnetic device Download PDF

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Publication number
US3739465A
US3739465A US00173592A US3739465DA US3739465A US 3739465 A US3739465 A US 3739465A US 00173592 A US00173592 A US 00173592A US 3739465D A US3739465D A US 3739465DA US 3739465 A US3739465 A US 3739465A
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US
United States
Prior art keywords
arms
magnet core
blank
yoke
vibration
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
US00173592A
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English (en)
Inventor
A Krajc
K Romer
J Schmid
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.)
Junkers and Co GmbH
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Junkers and Co 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 Junkers and Co GmbH filed Critical Junkers and Co GmbH
Application granted granted Critical
Publication of US3739465A publication Critical patent/US3739465A/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
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
    • F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
    • F16K31/0644—One-way valve
    • F16K31/0655—Lift valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23Q—IGNITION; EXTINGUISHING-DEVICES
    • F23Q9/00—Pilot flame igniters
    • F23Q9/08—Pilot flame igniters with interlock with main fuel supply
    • F23Q9/12—Pilot flame igniters with interlock with main fuel supply to permit the supply to the main burner in dependence upon existence of pilot flame
    • F23Q9/14—Pilot flame igniters with interlock with main fuel supply to permit the supply to the main burner in dependence upon existence of pilot flame using electric means, e.g. by light-sensitive elements
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/01—Control of temperature without auxiliary power
    • G05D23/12—Control of temperature without auxiliary power with sensing element responsive to pressure or volume changes in a confined fluid
    • G05D23/125—Control of temperature without auxiliary power with sensing element responsive to pressure or volume changes in a confined fluid the sensing element being placed outside a regulating fluid flow
    • G05D23/126—Control of temperature without auxiliary power with sensing element responsive to pressure or volume changes in a confined fluid the sensing element being placed outside a regulating fluid flow using a capillary tube
    • G05D23/127—Control of temperature without auxiliary power with sensing element responsive to pressure or volume changes in a confined fluid the sensing element being placed outside a regulating fluid flow using a capillary tube to control a gaseous fluid circulation
    • G05D23/128—Control of temperature without auxiliary power with sensing element responsive to pressure or volume changes in a confined fluid the sensing element being placed outside a regulating fluid flow using a capillary tube to control a gaseous fluid circulation the fluid being combustible
    • 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
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49009—Dynamoelectric machine
    • 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
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/4902—Electromagnet, transformer or inductor
    • 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
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/4902—Electromagnet, transformer or inductor
    • Y10T29/49075—Electromagnet, transformer or inductor including permanent magnet or core

Definitions

  • the present invention relates generally to electromagnetic devices, and more particularly to a method of making an electromagnetic device.
  • thermoelectric ignition safety devices in certain appliances, particularly in appliances using combustible gas.
  • Such devices comprise an anchor plate cooperating with a plunger and being associated with the free ends of two arms of a bifurcated magnet core whose yoke is fixedly mounted and which carries the magnet winding.
  • This type of construction is entirely satisfactory.
  • it has been found that these devices require improvement.
  • the holding power of the electromagnet and the closure time of the ignition safety device which is operated by the electromagnet are of considerable importance in such constructions.
  • the material composition and the manner of annealing are factors which affect the operational efficiency of a magnet insert in such devices.
  • one feature of our invention resides in making an electromagnetic device having an armature plate, a bifurcated magnet core having a fixedly mounted yoke and a pair of arms cooperating with the armature plate and each being provided with a pole surface facing the same, and a winding applied onto the magnet core.
  • the inherent frequency of the fundamental oscillation i.e., the natural frequency of vibration of the magnet core prior to application of the winding is in excess of 25 kilohertz (kHz).
  • the invention is based on the finding that if the inherent frequency of the fundamental oscillation caused mechanically as by a guiding or lapping wheel of the magnet core with fixedly mounted yoke and prior to application of the winding, is in excess of 25 kHz, the pole surfaces at the free ends of the arms of the magnet core can be produced with such precision that they will be highly planar and also will both be located in one and the same plane rather than being skew with reference to one another, thereby providing a significantly increased area of contact with the abutment surface of the armature plate and permitting an extreme reduction in the dimensions of the electromag netic device without adversely effecting the holding power thereof.
  • the inherent frequency of the fundamental oscillation of the non-wound magnet core is preferably on the order of 30 kHz.
  • the inherent frequency of one of the nonwound arms by itself is higher than 30 kHz, preferably on the order of 34 kHz.
  • the volume of one arm is less than mm, preferably smaller than 60 mm.
  • the spacing between the two arms is smaller than the thickness of the arms and preferably the magnet core is extrusion molded from soft-magnetic material.
  • the dimensions and the weight of a device according to the invention can be reduced to a fraction of the values which heretofore were considered the lower limits by specialists in the field.
  • FIG. 1 is a somewhat diagrammatic longitudinal section through a thermo-electric ignition safety device utilizing an electromagnetic device made according to the present invention
  • FIG. 2 is a fragmentary section through the device illustrated in FIG. 1, on an enlarged scale;
  • FIG. 3 is a section taken on the line III III of FIG. 2 with the winding having been omitted;
  • FIG. 4 is a section taken on the line IVIV of FIG. 3.
  • the device comprises a housing whose inner wall is provided with a valve seat 1 1 for a valve member 12 of the safety valve.
  • a gas inlet aperture 13 and a gas outlet aperture 14 are provided on the housing 10.
  • valve member 12 is connected with a valve stem or plunger 15 and a helically convoluted spring 16 bears upon the valve member 12 urging the same to valve-closing position, as is evident from FIGS. 1 and 2.
  • the free end of the valve stem 15 extends into a mag netic device which is generally identified with reference numeral 20 and more clearly illustrated in FIGS. 2-4.
  • the device 20 comprises an armature plate 21 which is connected with the valve stem 15 and an electromagnet 22 which is of substantially U-shaped configuration.
  • This electromagnet, or bifurcated magnet core comprises a plate 221 which constitutes its yoke and which is of circular outline, and two arms 222 and 223 extending from the plate 221 towards the armature plate 21 and having a substantially kidney-shaped cross-section (compare FIG. 3).
  • a peripherally projecting portion 224 is provided on the plate 221 in the region of the base surface thereof and serves in known manner for connecting the magnetic core 22 to a supporting plate 23 through its after the same is introduced into the housing 10, connected with mass of the housing 10.
  • the other end of the winding is identified with reference numeral 241 and is passed through a bore 225 in the plate 221.
  • a contact member 25 is provided on the plate 23 in known manner, being insulated electrically with reference to the plate 23 and having a bore 251 through which the end portion 241 of the winding 24 extends, the end portion 241 being connected with the member 25 in electrically conductive manner, for instance by soldering or the like. Also connected in known manner to the contact member 25 is the contact 261 of a thermal element 26 shown in FIG. 1.
  • the magnet core 22 and the anchor plate 21 are in a manner which is also known per se by a protective'cap 27 through and into which the valve stem 15 extends. That side of the cap 27 which faces the closure member 12 of the valve serves at the same time as an abutment for the spring 16.
  • the structural unit consisting of the magnet insert 20 including valve member 12, anchor plate 21, magnet core 22, supporting plate 23 and contact member 25, is inserted into the housing 10 of the device shown in FIG. 1 and is maintained in position by a screw cap 28 which at the same time serves to secure the contact 261 of the thermal element 26.
  • a pushbutton 29 is shiftably inserted at that end of the housing 10 which is opposite the magnetic insert 20; the pushbutton 29 is rigidly connected with a plunger 291 and is displaceable in the direction towards the valve member 12 of the valve against the oppositely directed biassing force of a return spring 30.
  • valve member 12 By displacing the pushbutton 29 with the plunger 291 oppositely the force of the spring 30 the valve member 12 can be lifted off its valve seat 11 whereby at the same time the abutment surface of the anchor plate 21 is placed into abutment with the pole surfaces on the arms 222 and 223 of the magnet core 22 when the gasoperated device which is provided with the ignition safety device illustrated in FIG. 1, is to be put into operation.
  • the contact area between the pole surfaces on the arms 222 and 223 of the magnet core 22 and the abutment surface of the anchor blade 21 is significantly increased by assuring when carrying out the present method that the inherent frequency of the fundamental oscillation of the magnet core 22 when the same does not carry the winding and when the yoke constituted by the plate 221 is fixedly mounted is higher than 25 kHz (kilohertz).
  • the pole surfaces at the free ends of the arms 222 and 223 of the magnet core 22 can be produced in such a manner that they will not only be highly planar but'also will be located in a common plane. This means that the slight curvature of each pole surface which heretofore was unavoidable to all intents and purposes, no longer exists and further that the pole surfaces of the arms 222 and 223 are no longer skew with reference to one another, or at least that this factor is reduced to an acceptable minimum. As a result, the contact area between the pole surfaces of the arms 222 and 223 on the magnet core 22 and the abutment surface on the anchor plate 21 is significantly increased.
  • the fundamental frequency of one of the arms without the winding alone be higher than 30 kHz
  • the dimensions of the magnet core 22 may be significantly smaller than it was heretofore thought possible by the experts while the device yet provides adequate holding power.
  • the volume of one of the arms 222 or 223 of the magnet core 22 is less than 70 mm, preferably less than 60 mm Furthermore, the spacing between the two arms 222 and 223 is smaller than the thickness of an individual arm.
  • the diameter of the magnet core 22 is on the order of 7 mm and the total axial length of the magnet core 22 only insignificantly exceeds this value. This is by contrast with a diameter of 10 mm which heretofore was thought to be the lowermost practicable limit, and because of this reduction in the dimensions the weight of the magnet core is correspondingly decreased and is only approximately one-quarter of the weight heretofore found in the smallest magnet core having a diameter of 10 mm.
  • the contact member 25 and the valve stem 15 may be unchanged as compared to the known constructions, although it is of course possible to accommodate the dimensions of the contact member 25 to differently-dimensioned contact portions of a thermal element without affecting the intent and scope of the present invention in any manner.
  • the magnet core it is necessary that the magnet core be so produced that it have the desired inherent frequency of its fundamental oscillation, and that thereupon the contact surfaces be produced on the free ends of the arms 222 and 223 of the magnet core. Because the resulting contact surfaces are highly planar, and because they are located precisely in a common plane, the area of contact between the pole surfaces or contact surfaces on the arms 222 and 223 and the abutment surface on the anchor plate 21 is significantly higher than heretofore possible so that despite a decrease in the overall area of the pole surfaces and of the abutment surface of the anchor plate 21 the electromagnetic device still has the desired holding power.
  • spective pole surfaces which are highly planar and strictly located in a common plane so as to have a maximum area of contact with a planar abutment surface of an armature plate, said method comprising the steps of forming a bifurcated magnet core blank having a yoke and a pair of arms, from a magnet material having a natural frequency of vibration which is in excess of 25 kHz when said yoke is fixedly mounted; forming on the free ends of said arms by a mechanical metal-working operation pole surfaces which are highly planar and strictly located in a common plane, said natural frequency of vibration of said magnet material of said bifurcated magnet core blank preventing vibration of said bifurcated magnet core blank during said mechanical metal working operation so as not to interfere with said mechanical metal working operation and thus permit obtention of highly planar pole surfaces strictly located in a common plane; and mounting said magnet core with the thus obtained highly planar pole surfaces located in a common plane in such a manner that said pole surfaces extend parallel to and facing said planar abutment surface of said
  • each of said arms has a natural frequency of vibration which is in excess of 30 kHz when said yoke is fixedly mounted.
  • each of said arms has a natural frequency of vibration which is substantially equal to 34 kHz.
  • step of forming said blank comprises providing the latter with said arms so dimensioned as to have respective volumes smaller than mm".
  • a method as defined in claim 1, wherein the step of forming said blank comprises press-molding said blank from said magnetic material.
  • step of forming said blank comprises making the blank with said arms spaced from one another by a distance which is smaller than the thickness of the respective arms.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Magnetically Actuated Valves (AREA)
  • Electromagnets (AREA)
  • Impact Printers (AREA)
US00173592A 1969-07-05 1971-08-20 Method of making an electromagnetic device Expired - Lifetime US3739465A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1934163A DE1934163B2 (de) 1969-07-05 1969-07-05 Elektromagneteinsatz für thermoelektrische Zündsicherungsvorrichtungen, insbesondere für gasbeheizte Geräte

Publications (1)

Publication Number Publication Date
US3739465A true US3739465A (en) 1973-06-19

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US00173592A Expired - Lifetime US3739465A (en) 1969-07-05 1971-08-20 Method of making an electromagnetic device

Country Status (9)

Country Link
US (1) US3739465A (de)
AT (1) AT290787B (de)
BE (1) BE741705A (de)
BR (1) BR6912454D0 (de)
DE (1) DE1934163B2 (de)
ES (1) ES371125A1 (de)
FR (1) FR2050513B1 (de)
GB (1) GB1287474A (de)
NL (1) NL163319B (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060138372A1 (en) * 2002-09-25 2006-06-29 Bsh Bosch Und Siemens Hausgerate Gmbh Gas tap comprising an electromagnetic safety valve and magnetic insert for an electromagnetic safety valve
US11566381B2 (en) * 2017-12-21 2023-01-31 Plasser & Theurer Export Von Bahnbaumaschinen Gmbh Tamping assembly for tamping sleepers of a track

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3039012A (en) * 1958-12-22 1962-06-12 Rheinische Werkzeug & Metallf Vibrating head
US3156836A (en) * 1959-11-25 1964-11-10 Novo Ind Corp Electromagnetic explosionproof vibratory head

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3039012A (en) * 1958-12-22 1962-06-12 Rheinische Werkzeug & Metallf Vibrating head
US3156836A (en) * 1959-11-25 1964-11-10 Novo Ind Corp Electromagnetic explosionproof vibratory head

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060138372A1 (en) * 2002-09-25 2006-06-29 Bsh Bosch Und Siemens Hausgerate Gmbh Gas tap comprising an electromagnetic safety valve and magnetic insert for an electromagnetic safety valve
US9140451B2 (en) * 2002-09-25 2015-09-22 Bsh Hausgeraete Gmbh Gas tap comprising an electromagnetic safety valve and magnetic insert for an electromagnetic safety valve
US11566381B2 (en) * 2017-12-21 2023-01-31 Plasser & Theurer Export Von Bahnbaumaschinen Gmbh Tamping assembly for tamping sleepers of a track

Also Published As

Publication number Publication date
NL163319B (nl) 1980-03-17
FR2050513B1 (de) 1973-03-16
AT290787B (de) 1971-06-25
GB1287474A (en) 1972-08-31
DE1934163A1 (de) 1971-01-14
FR2050513A1 (de) 1971-04-02
NL6914992A (de) 1971-01-07
BR6912454D0 (pt) 1973-03-08
BE741705A (de) 1970-04-16
ES371125A1 (es) 1972-02-16
DE1934163B2 (de) 1974-04-25

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