EP2211099A1 - Use of chromium-based stainless steel for manufacturing a domestic use and manual opening magnetic unit actuated by thermocouple or equvalent element - Google Patents

Use of chromium-based stainless steel for manufacturing a domestic use and manual opening magnetic unit actuated by thermocouple or equvalent element Download PDF

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Publication number
EP2211099A1
EP2211099A1 EP09380005A EP09380005A EP2211099A1 EP 2211099 A1 EP2211099 A1 EP 2211099A1 EP 09380005 A EP09380005 A EP 09380005A EP 09380005 A EP09380005 A EP 09380005A EP 2211099 A1 EP2211099 A1 EP 2211099A1
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EP
European Patent Office
Prior art keywords
magnetic
alloy
chromium
stainless steel
magnetic unit
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.)
Withdrawn
Application number
EP09380005A
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German (de)
French (fr)
Inventor
José Luis Flores Torre
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Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to EP09380005A priority Critical patent/EP2211099A1/en
Priority to BRPI1000111-5A priority patent/BRPI1000111A2/en
Priority to CN201010141724A priority patent/CN101792887A/en
Publication of EP2211099A1 publication Critical patent/EP2211099A1/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N1/00—Regulating fuel supply
    • F23N1/005—Regulating fuel supply using electrical or electromechanical means
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/11—Making amorphous alloys
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/02—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium
    • F23N5/10—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using thermocouples
    • F23N5/105—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using thermocouples using electrical or electromechanical means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/12—Fuel valves
    • F23N2235/14—Fuel valves electromagnetically operated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/12—Fuel valves
    • F23N2235/24—Valve details
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
    • H01F1/147—Alloys characterised by their composition
    • H01F1/14708—Fe-Ni based alloys

Definitions

  • the present invention relates to a domestic use and manual opening magnetic unit actuated by a thermocouple or equivalent element. It particularly relates to the use of a chromium-based stainless steel alloy in the production of the magnetic armature, of the magnetic core or of both elements of said magnetic unit.
  • the magnetic units forming part of a Magnetic Unit-Thermocouple Assembly are elements which are well known and used in the state of the art, which are disclosed, among others, in the following documents MU 200203006, MU 200502016, EP 1624247 , EP 1909029 or WO03/085324 . They are used as safety systems for domestic gas cookers, for domestic gas water heaters and for domestic gas water boilers.
  • the Magnetic Unit-Thermocouple Assembly acts as a system for cutting off the gas flow to the apparatus when the flame of the burner is extinguished for some reason.
  • thermocouple generates in the presence of the flame an electrical voltage which keeps the valve of the Magnetic Unit open, and allows the gas to pass. If the flame is extinguished for some reason, the Thermocouple (or equivalent element) stops generating the electrical voltage, the Magnetic Unit closes the gas valve, and thus prevents the gas from coming out in the electrical appliance, which could cause explosions or poison people.
  • the Magnetic Unit consists of several elements, including the magnetic core and the magnetic armature.
  • the magnetic core is the element excited by a coil receiving the electrical voltage generated by the thermocouple, or equivalent functional element; and attracts the magnetic armature, which is solidarily joined to the gas valve.
  • the magnetic armature and the magnetic core of a magnetic unit actuated by a thermocouple are manufactured from a material consisting of a Fe-Ni alloy.
  • Fe-Ni alloys have an excellent combination of those properties which are necessary to meet the demands of magnetic units, namely, magnetism, magnetic hysteresis, residual magnetism, coercivity and resistance to corrosion.
  • current used Fe-Ni alloys are very expensive due to the fact that the minimum amount of Ni which must be present in said alloys is of the order of 48%. In this sense it is known that amounts of Ni lower than 48% provide alloys with a much lower resistance to corrosion and are therefore unacceptable.
  • the inventors have discovered that it is possible to manufacture the magnetic armature, the magnetic core or both elements of a domestic use and manual opening magnetic unit actuated by a thermocouple from chromium-based stainless steel alloys and obtain an efficient and totally satisfactory functionality of said magnetic core.
  • These alloys have an excellent combination of the magnetic properties which are desirable in an armature and a magnetic core so that they efficiently carry out their function within the magnetic unit. Furthermore, these alloys confer the necessary resistance to corrosion to the armature and the magnetic core throughout their useful life.
  • the invention relates to a new domestic use and manual opening magnetic unit actuated by thermocouple or an equivalent element in which the magnetic armature, the magnetic core, or both elements are made up of a chromium-based stainless steel alloy.
  • the chromium-based stainless steel alloys relate to those having a Cr content between 17.25 and 18.25%.
  • the magnetic armature, the magnetic core, or both elements are made up of a chromium-based stainless steel alloy having an amount of nickel less than 1%. In another preferred embodiment the alloy has an amount of niobium comprised between 0% and 0.25%.
  • the alloy has the following composition: Fe C Cr Ni Nb P If Mn S Mo 78.67 0.01 17.5 0.2 0.25 0.02 0.9 0.4 0.3 1.75
  • the alloy has the following composition: Fe C Cr Ni P If Mn S Mo 79.9 - 79.5 0.06 17.25-18.25 0.6 0.03 1-0.5 0.8 00.2-0.4 0.5
  • the invention relates to the use of a chromium-based stainless steel alloy in the production of the magnetic armature, of the magnetic core or of both elements of a domestic use and manual opening magnetic unit actuated by thermocouple or an equivalent element.
  • Said element can be any conventional element known to a person skilled in the art.
  • an alloy having an amount of nickel less than 1% is used.
  • the alloy has an amount of niobium comprised between 0% and 0.25%.
  • alloy called Alloy 1 the composition of which is the following: Fe C Cr Ni Nb P If Mn S Mo 78.67 0.01 17.5 0.2 0.25 0.02 0.9 0.4 0.3 1.75
  • an alloy having the following composition is used: Fe C Cr Ni P If Mn S Mo 79.9 - 79.5 0.06 17.25-18.25 0.6 0.03 1-0.5 0.8 00.2-0.4 0.5
  • Alloy 1 is stabilized with a niobium content of 0.25%, which provides it with a greater resistance against oxidation. Its permeability is lower than that of Alloy 2, and its coercivity is somewhat higher. Its saturation is also higher, and this parameter is very suitable for its use according to the present invention.
  • Alloy 2 has a lower resistance against oxidation than Alloy 1, which is something to be considered when selecting it for its use according to the present invention.
  • the use of one alloy or another can depend considerably on the characteristics of the gas which is going to be used in the electrical appliance in which the Magnetic Unit is placed. Both are commercially available.
  • Alloy 1 shows a better resistance against corrosion and has magnetic characteristics similar to Alloy 2, it is therefore the preferred alloy for its use in corrosive media. Its resistance against the corrosion has been analyzed with standard moisture and salt spray tests in environments with increasing temperatures and in much severer conditions than those that the domestic use magnetic groups of the invention must withstand; both tests shows the same conclusions.
  • the temperature to be applied to the chromium-based alloys is about 850oC.
  • Highly pure and well annealed alloys are the ones having an optimal magnetic performance.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Soft Magnetic Materials (AREA)
  • Electromagnets (AREA)

Abstract

The present invention relates to the use of a chromium-containing stainless steel alloy having a chromium content comprised between 17.25 and 18.25% in the production of the magnetic armature, of the magnetic core or of both elements of a manual opening magnetic unit actuated by a thermocouple or equivalent element. The invention also relates to said magnetic unit.

Description

    Field of the Invention
  • The present invention relates to a domestic use and manual opening magnetic unit actuated by a thermocouple or equivalent element. It particularly relates to the use of a chromium-based stainless steel alloy in the production of the magnetic armature, of the magnetic core or of both elements of said magnetic unit.
    • Background of the Invention
  • The magnetic units forming part of a Magnetic Unit-Thermocouple Assembly are elements which are well known and used in the state of the art, which are disclosed, among others, in the following documents MU 200203006, MU 200502016, EP 1624247 , EP 1909029 or WO03/085324 . They are used as safety systems for domestic gas cookers, for domestic gas water heaters and for domestic gas water boilers. The Magnetic Unit-Thermocouple Assembly acts as a system for cutting off the gas flow to the apparatus when the flame of the burner is extinguished for some reason.
  • The thermocouple generates in the presence of the flame an electrical voltage which keeps the valve of the Magnetic Unit open, and allows the gas to pass. If the flame is extinguished for some reason, the Thermocouple (or equivalent element) stops generating the electrical voltage, the Magnetic Unit closes the gas valve, and thus prevents the gas from coming out in the electrical appliance, which could cause explosions or poison people.
  • The Magnetic Unit consists of several elements, including the magnetic core and the magnetic armature. The magnetic core is the element excited by a coil receiving the electrical voltage generated by the thermocouple, or equivalent functional element; and attracts the magnetic armature, which is solidarily joined to the gas valve. There is also the Magnetic Unit valve, a component which is located in the gas valve, responsible for opening or closing the gas passage.
  • In the state of the art the magnetic armature and the magnetic core of a magnetic unit actuated by a thermocouple are manufactured from a material consisting of a Fe-Ni alloy. These Fe-Ni alloys have an excellent combination of those properties which are necessary to meet the demands of magnetic units, namely, magnetism, magnetic hysteresis, residual magnetism, coercivity and resistance to corrosion. However, currently used Fe-Ni alloys are very expensive due to the fact that the minimum amount of Ni which must be present in said alloys is of the order of 48%. In this sense it is known that amounts of Ni lower than 48% provide alloys with a much lower resistance to corrosion and are therefore unacceptable.
  • There is therefore the need in the state of the art to provide new alternative magnetic units which are effective and at the same time cheaper.
    • Description of the Invention
  • The inventors have discovered that it is possible to manufacture the magnetic armature, the magnetic core or both elements of a domestic use and manual opening magnetic unit actuated by a thermocouple from chromium-based stainless steel alloys and obtain an efficient and totally satisfactory functionality of said magnetic core. These alloys have an excellent combination of the magnetic properties which are desirable in an armature and a magnetic core so that they efficiently carry out their function within the magnetic unit. Furthermore, these alloys confer the necessary resistance to corrosion to the armature and the magnetic core throughout their useful life.
  • Therefore, in one aspect the invention relates to a new domestic use and manual opening magnetic unit actuated by thermocouple or an equivalent element in which the magnetic armature, the magnetic core, or both elements are made up of a chromium-based stainless steel alloy.
  • In the context of the present invention the chromium-based stainless steel alloys relate to those having a Cr content between 17.25 and 18.25%.
  • In a preferred embodiment the magnetic armature, the magnetic core, or both elements are made up of a chromium-based stainless steel alloy having an amount of nickel less than 1%. In another preferred embodiment the alloy has an amount of niobium comprised between 0% and 0.25%.
  • In another preferred embodiment the alloy has the following composition:
    Fe C Cr Ni Nb P If Mn S Mo
    78.67 0.01 17.5 0.2 0.25 0.02 0.9 0.4 0.3 1.75
  • In another preferred embodiment the alloy has the following composition:
    Fe C Cr Ni P If Mn S Mo
    79.9 - 79.5 0.06 17.25-18.25 0.6 0.03 1-0.5 0.8 00.2-0.4 0.5
  • In another aspect the invention relates to the use of a chromium-based stainless steel alloy in the production of the magnetic armature, of the magnetic core or of both elements of a domestic use and manual opening magnetic unit actuated by thermocouple or an equivalent element. Said element can be any conventional element known to a person skilled in the art.
  • In a preferred embodiment an alloy having an amount of nickel less than 1% is used. In another preferred embodiment the alloy has an amount of niobium comprised between 0% and 0.25%.
  • In another preferred embodiment the alloy called Alloy 1 is used, the composition of which is the following:
    Fe C Cr Ni Nb P If Mn S Mo
    78.67 0.01 17.5 0.2 0.25 0.02 0.9 0.4 0.3 1.75
  • In another preferred embodiment an alloy (Alloy 2) having the following composition is used:
    Fe C Cr Ni P If Mn S Mo
    79.9 - 79.5 0.06 17.25-18.25 0.6 0.03 1-0.5 0.8 00.2-0.4 0.5
  • These alloys have the properties which are indicated in the following Table:
    Permeability Coercivity A/m Saturation, Gauss
    Alloy 1 1,500 200 15,000
    Alloy 2 2,500 130 2,500 a 8,000
  • Alloy 1 is stabilized with a niobium content of 0.25%, which provides it with a greater resistance against oxidation. Its permeability is lower than that of Alloy 2, and its coercivity is somewhat higher. Its saturation is also higher, and this parameter is very suitable for its use according to the present invention.
  • Alloy 2 has a lower resistance against oxidation than Alloy 1, which is something to be considered when selecting it for its use according to the present invention. The use of one alloy or another can depend considerably on the characteristics of the gas which is going to be used in the electrical appliance in which the Magnetic Unit is placed. Both are commercially available.
  • Alloy 1 shows a better resistance against corrosion and has magnetic characteristics similar to Alloy 2, it is therefore the preferred alloy for its use in corrosive media. Its resistance against the corrosion has been analyzed with standard moisture and salt spray tests in environments with increasing temperatures and in much severer conditions than those that the domestic use magnetic groups of the invention must withstand; both tests shows the same conclusions.
  • On the other hand, the use of intense magnetic fields in the manufacturing process, both for handling the materials and in their inspection, or in the elimination of voltages, can leave a permanent magnetism therein which is not suitable for the function to be performed, it is for this reason that the use thereof has to be limited as much as possible. The presence of a residual magnetism can furthermore attract small metal particles which could affect the good performance of the assembly.
  • Working in cold conditions makes the coercivity of the materials rise.
  • It is therefore advisable to thermally treat the materials, apply a treatment eliminating voltages and preventing the possible presence of magnetism therein, demagnetizing them. The temperature to be applied to the chromium-based alloys is about 850ºC. Highly pure and well annealed alloys are the ones having an optimal magnetic performance.
  • The better resistance against corrosion is obtained without passivation, when the surface of the parts are free of chips or other foreign particles; if steel tools are used in the core and/or armature manufacturing processes, the application of a final passivation process eliminating the contaminating particles coming from the manufacturing process is recommended.

Claims (10)

  1. Use of a chromium-based stainless steel alloy as a raw material for manufacturing the magnetic core, the magnetic armature or both of a domestic use and manual opening magnetic unit actuated by thermocouple or an equivalent element.
  2. Use according to claim 1, wherein the chromium-based stainless steel alloy has an amount of nickel less than 1%.
  3. Use according to claim 1 or 2, wherein the chromium-based stainless steel alloy has an amount of niobium comprised between 0% and 0.25%.
  4. Use according to claim 1 or 2, wherein the alloy has the following composition: Fe C Cr Ni Nb P If Mn S Mo 78.67 0.01 17.5 0.2 0.25 0.02 0.9 0.4 0.3 1.75
  5. Use according to claim 1 or 2, wherein the alloy has the following composition: Fe C Cr Ni P If Mn S Mo 79.9 - 79.5 0.06 17.25 - 18.25 0.6 0.03 1-0.5 0.8 00.2- 0.4 0.5
  6. Domestic use and manual opening magnetic unit actuated by thermocouple or an equivalent element wherein the magnetic armature, the magnetic core, or both elements are made up of a chromium-based stainless steel alloy.
  7. Magnetic unit according to claim 6, wherein the chromium-based stainless steel alloy has an amount of nickel less than 1%.
  8. Magnetic unit according to claim 6 or 7, wherein the alloy has an amount of niobium comprised between 0% and 0.25%.
  9. Magnetic unit according to claim 6, wherein the alloy has the following composition: Fe C Cr Ni Nb P If Mn S Mo 78.67 0.01 17.5 0.2 0.25 0.02 0.9 0.4 0.3 1.75
  10. Magnetic unit according to claim 6, wherein the alloy has the following composition: Fe C Cr Ni P If Mn S Mo 79.9 - 79.5 0.06 17.25-18.25 0.6 0.03 1-0.5 0.8 00.2-0.4 0.5
EP09380005A 2009-01-21 2009-01-21 Use of chromium-based stainless steel for manufacturing a domestic use and manual opening magnetic unit actuated by thermocouple or equvalent element Withdrawn EP2211099A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP09380005A EP2211099A1 (en) 2009-01-21 2009-01-21 Use of chromium-based stainless steel for manufacturing a domestic use and manual opening magnetic unit actuated by thermocouple or equvalent element
BRPI1000111-5A BRPI1000111A2 (en) 2009-01-21 2010-01-19 use of chromium-based stainless steel for the manufacture of a hand-operated, household thermocouple or equivalent magnet
CN201010141724A CN101792887A (en) 2009-01-21 2010-01-21 Chromium-containing stainless steel is being made by the thermoelectricity purposes in the manually opened magnetic devices of family expenses that drives of equivalence element occasionally

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP09380005A EP2211099A1 (en) 2009-01-21 2009-01-21 Use of chromium-based stainless steel for manufacturing a domestic use and manual opening magnetic unit actuated by thermocouple or equvalent element

Publications (1)

Publication Number Publication Date
EP2211099A1 true EP2211099A1 (en) 2010-07-28

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EP09380005A Withdrawn EP2211099A1 (en) 2009-01-21 2009-01-21 Use of chromium-based stainless steel for manufacturing a domestic use and manual opening magnetic unit actuated by thermocouple or equvalent element

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EP (1) EP2211099A1 (en)
CN (1) CN101792887A (en)
BR (1) BRPI1000111A2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015218439A1 (en) 2015-09-25 2017-03-30 Robert Bosch Gmbh In its core losses reduced part and process for its preparation

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109741902A (en) * 2019-01-08 2019-05-10 苏州腾凯金属材料有限公司 A kind of demagnetizing method of solenoid valve

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Publication number Priority date Publication date Assignee Title
US3757263A (en) * 1972-07-24 1973-09-04 Richdel Solenoid valve operator
JPS5841257A (en) * 1981-09-02 1983-03-10 Hitachi Ltd Electromagnetic fuel injection device
EP0109155A1 (en) * 1982-09-22 1984-05-23 Webber Electro Components Plc. Solenoid valve with external sensor control
EP1288482A2 (en) * 2001-08-31 2003-03-05 Delphi Technologies, Inc. Force-balanced gas control valve
WO2003085324A1 (en) 2002-04-11 2003-10-16 Omvl S.R.L. Thermocouple safety device particularly for gas burnes
EP1624247A2 (en) 2004-08-03 2006-02-08 Orkli, S. Coop. Safety gas valve with electromagnet
EP1698817A2 (en) * 2005-03-05 2006-09-06 Arichell Technologies, Inc. Electromagnetic apparatus and method for controlling fluid flow
EP1909029A2 (en) 2006-10-04 2008-04-09 Orkli, S. Coop. Safety electromagnetic valve with internal spring

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WO1996011483A1 (en) * 1994-10-11 1996-04-18 Crs Holdings, Inc. Corrosion-resistant magnetic material
FR2811683B1 (en) * 2000-07-12 2002-08-30 Ugine Savoie Imphy FERRITIC STAINLESS STEEL FOR USE IN FERROMAGNETIC PARTS
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Publication number Priority date Publication date Assignee Title
US3757263A (en) * 1972-07-24 1973-09-04 Richdel Solenoid valve operator
JPS5841257A (en) * 1981-09-02 1983-03-10 Hitachi Ltd Electromagnetic fuel injection device
EP0109155A1 (en) * 1982-09-22 1984-05-23 Webber Electro Components Plc. Solenoid valve with external sensor control
EP1288482A2 (en) * 2001-08-31 2003-03-05 Delphi Technologies, Inc. Force-balanced gas control valve
WO2003085324A1 (en) 2002-04-11 2003-10-16 Omvl S.R.L. Thermocouple safety device particularly for gas burnes
EP1624247A2 (en) 2004-08-03 2006-02-08 Orkli, S. Coop. Safety gas valve with electromagnet
EP1698817A2 (en) * 2005-03-05 2006-09-06 Arichell Technologies, Inc. Electromagnetic apparatus and method for controlling fluid flow
EP1909029A2 (en) 2006-10-04 2008-04-09 Orkli, S. Coop. Safety electromagnetic valve with internal spring

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Title
ANONYMOUS: "Stainless Steel - Grade Description Summary", INTERNET ARTICLE, 21 March 2006 (2006-03-21), pages 1 - 3, XP002534296, Retrieved from the Internet <URL:http://www.225steel.com/catalog/stainless-steel.pdf> [retrieved on 20090626] *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015218439A1 (en) 2015-09-25 2017-03-30 Robert Bosch Gmbh In its core losses reduced part and process for its preparation

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Publication number Publication date
BRPI1000111A2 (en) 2011-09-13
CN101792887A (en) 2010-08-04

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