EP1467150B1 - Zündsicherung - Google Patents

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Publication number
EP1467150B1
EP1467150B1 EP04008590A EP04008590A EP1467150B1 EP 1467150 B1 EP1467150 B1 EP 1467150B1 EP 04008590 A EP04008590 A EP 04008590A EP 04008590 A EP04008590 A EP 04008590A EP 1467150 B1 EP1467150 B1 EP 1467150B1
Authority
EP
European Patent Office
Prior art keywords
pin
ignition
contact
electrical
safety device
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
EP04008590A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1467150A3 (de
EP1467150A2 (de
Inventor
Hans Hoeness
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch 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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1467150A2 publication Critical patent/EP1467150A2/de
Publication of EP1467150A3 publication Critical patent/EP1467150A3/de
Application granted granted Critical
Publication of EP1467150B1 publication Critical patent/EP1467150B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • 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
    • F23N5/00—Systems for controlling combustion
    • F23N5/24—Preventing development of abnormal or undesired conditions, i.e. safety arrangements
    • F23N5/242—Preventing development of abnormal or undesired conditions, i.e. safety arrangements using electronic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2231/00—Fail safe
    • F23N2231/12—Fail safe for ignition failures
    • 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

Definitions

  • thermoelectric ignition fuse with a valve housing and a button which acts via a pin on a solenoid valve of a solenoid valve insert, wherein the solenoid valve is in operative connection with an armature which is in the pressed state of the probe in contact with an electromagnet, and wherein the Ignition fuse has an electrical ignition device which is electrically conductively connected to at least one ground contact with the valve housing.
  • thermoelectric Zündschen such as in DE 1 256 176 disclosed, ensure that in gas-fired burners, the main gas flow is released only when a pilot flame is safely ignited.
  • an armature must be pressed against a spring force on an electromagnet for about 10 s with the aid of a button via a pin.
  • a solenoid valve is opened, which clears the way for a pilot gas, while the path for a main gas flow is closed by another valve.
  • a circuit is closed, which causes a spark band with which the ignition gas of the pilot flame is ignited at a pilot burner.
  • thermocouple The pilot flame heats a thermocouple.
  • the thermocouple is connected to the solenoid of the solenoid valve.
  • the thermo-current causes the excitation of the electromagnet, whereby an armature is held.
  • the electromagnet can be designed as U-magnet, the anchor as an anchor plate.
  • the solenoid valve After releasing the button, the solenoid valve remains open. Furthermore, the second valve is opened for the main gas flow, which ignites in the burner at the pilot flame.
  • a contact plate mounted on the pin is pressed against a contact spring connected to the electric ignition device. It thus forms a current path, starting from the electric ignition device via the contact spring, the contact plate, the pin, the guide bush of the pin and connected to the ground terminal of the electrical ignition valve housing.
  • the contact between the contact spring and the contact plate is about 1 to 3 mm, before the armature bears against the electromagnet, is closed.
  • thermoelectric ignition fuse This requirement has been found to be detrimental to the error-free operation of the thermoelectric ignition fuse.
  • the contact plate touches the contact spring, the ignition process is started with the audible and visible spark band for the operator.
  • the contact spring causes an increase in force for the key press. This combination is often interpreted by the operators of the device for the end of the keyway.
  • the armature is thus not pressed against the electromagnet and remains at a distance of about 1 to 3 mm away from it. After releasing the button, it is therefore not held by the electromagnet despite burning pilot flame and the solenoid valve closes again, whereby the ignition flame goes out and the burner is not ignited. This operating error leads to complaints.
  • thermoelectric ignition fuse of the type mentioned, in which this operating error is reliably avoided.
  • the object is achieved in that, when the button is pressed, a current flow path is formed by the ground contact of the electrical ignition device via the valve housing, the solenoid valve insert and the pin, the pin being electrically connected to the second pole of the electrical ignition device. This ensures that the circuit path is closed only when the button is fully depressed. Furthermore, the user feels a firm stop and the sparking tape is effected only when fully pressed button. There is no premature increase in force due to the contact spring, which simulates the end of the operation to the user.
  • a preferred variant of the invention provides that an electrical contact for closing the current path of the electrical ignition device between the electromagnet and the armature of the solenoid valve insert is formed. This ensures that when closing the contact of the electrical ignition device, the armature rests against the electromagnet and thus after the ignition of the pilot burner, the armature is securely held by the electromagnet and the solenoid valve remains open.
  • the electrical connection between the pin and the second pole of the electrical ignition device is permanently connected via the contact plate. This is preferably done with a cable connection. This has the advantage that the entire arrangement ensures the function without tolerances and an adjustment of the contact spring is eliminated.
  • a special design provides that in the non-depressed state of the probe and after ignition, the current flow path between the pin and the solenoid valve is interrupted. This has the advantage that when you release the button, the contact is opened, the spark plug goes out and the ignition fuse comes into operation.
  • the pin is guided electrically insulated from the valve housing. This ensures that the current path is only closed when the button is pressed to its end position.
  • a good insulation of the pin to the valve housing is achieved in that the spring plate and / or the socket of the pin guide and / or the socket of the valve and / or the pin guide and / or the valve made of electrically insulating material, preferably made of plastic, are formed.
  • a preferred variant of the invention provides that the input resistance of the electrical ignition device is designed high impedance. This may be necessary because a sufficient holding force of the magnetic insert is only achieved when the surfaces of the electromagnet and the armature are very smooth. These smooth surfaces are inconvenient for electrical contact since the contact resistance can be high. With this variant of the invention it is ensured that the resistance of the current path is always small with the push button pressed against the input resistance of the electrical ignition device and thus the voltage drop at the contact point is low.
  • thermoelectric ignition fuse 1 in FIG. 1 is a thermoelectric ignition fuse 1, as known from the prior art, shown in section and in a partially schematic representation.
  • the ignition fuse 1 consists of a valve housing 80, which has a gas inlet 81, a gas outlet 82 and a gas outlet 83.
  • the gas outlet 82 is connected via a line to a pilot burner 120 of a gas heating device.
  • the gas outlet 83 is connected to a burner 110 of the gas heating device, for example a gas hot water boiler.
  • the ignition fuse 1 an electric ignition device 10 which is conductively connected via a ground contact 12 to the valve housing 80.
  • the ignition device 10 has a voltage source 13, for example a battery and an ignition electronic unit which is not detailed here, which generates an ignition spark band in the pilot burner 120 as soon as the ignition device 10 is activated.
  • the ignition fuse 1 has a button 20 which is connected to a pin 30.
  • the pin 30 is guided in the valve housing 80 by means of a pin guide 40.
  • a contact plate 70 which is conductively connected to the pin 30.
  • the contact plate 70 closes upon actuation of the probe 20 has an electrical contact with a contact spring 11, which is connected to the second pole of the electrical ignition device 10.
  • the contact plate 70 is held in its position by means of a spring 60 which bears against a valve 100 and presses on a spring plate 50 mounted on the pin 30.
  • the valve housing 80 has at the lower end a receptacle 84 for a solenoid valve insert 90.
  • This consists of a magnetic insert 93, which in turn consists of an electromagnet 95 and an armature 94 which is connected via a rigid connection in operative connection with a solenoid valve 91, which in Hibernation seals a passage 85 in the valve housing 80 from below.
  • the solenoid valve 91 is supported by a spring 92 from the housing of the magnetic insert 93.
  • the solenoid 95 has a coil, not shown here, which is electrically connected to a thermocouple 150, which is located on the pilot burner 120.
  • the button 20 When commissioning the ignition fuse 1, the button 20 must be pressed for about 10 seconds.
  • the pin 30 presses on the solenoid valve 91, which presses the armature 94 to the solenoid 95 via the rigid connection.
  • the solenoid valve 91 By depressing the solenoid valve 91, it is achieved that the gas flowing in through the gas inlet 81 can reach the pilot burner 120 via the gas outlet 82.
  • the valve 100 seals the passage 85 from above, so that initially no gas can pass through the gas outlet 83 to the burner 110.
  • the contact between the contact spring 11 of the electric ignition device 10 and the contact plate 70 is closed, so that a current flow path 130 via the contact spring 11, the contact plate 70, the pin 30, the pin guide 40, the valve housing 80 and the ground contact 12 to the voltage source 13 of the electrical ignition device 10 is formed.
  • an ignition spark band is generated on the pilot burner 120 via the ignition device 10, which ignites a pilot flame.
  • the pilot flame heats the thermocouple 150, which generates a thermal current, which in turn generates a magnetic force in the electromagnet 95, which attracts the armature 94.
  • the solenoid valve 91 When you release the button 20 remains after the ignition of the pilot burner 120, the solenoid valve 91 is opened. The button 20 goes back together with the contact plate 70, by the spring force of the spring 60 in the starting position, thereby interrupting the contact between the contact plate 70 and the contact spring 11. At the same time, the valve 100 opens the passage 85 and thus gives the gas flow through the gas outlet 83 to the burner 110 free.
  • FIG. 2 shows a Zündsch 1 in an inventive design.
  • ignition fuse 1 is a current flow path 130 of the ground contact 12 of the electric ignition device 10 starting on the valve housing 80, the solenoid valve insert 90 and the pin 30 is formed with pressed button 20.
  • the pin 30 is permanently electrically - in the illustrated embodiment by means of a cable connection 140 - between the Contact plate 70, which is conductively seated on the pin 30, and connected to the second pole of the electrical ignition device 10.
  • the push-button 20 when the push-button 20 is actuated, only the current-carrying path 130 is closed when an electrical contact is made between the electromagnet 95 and the armature 94 of the magnetic insert 90.
  • the pin 30 is electrically conductive in the depressed state via the solenoid valve 91 with the armature 94 in contact.
  • the pin 30 is guided in this arrangement with respect to the valve housing 80 electrically isolated.
  • the spring plate 50 is made of an electrically insulating material, for example of plastic. An electrical contact via the spring 60 to the valve housing 80 is thereby prevented.
  • serving to guide the pin 30 pin guide 40 has a socket 41, which is also made of an insulating material, preferably made of plastic.
  • the valve 100 has in the embodiment shown a bushing 101, which isolates the pin 30 relative to the valve housing 80.
  • the electrical ignition device 10 is designed high impedance, which may be necessary in particular if, to achieve a higher holding force, the surfaces of the Electromagnet 95 and the armature 94 are very smooth, for example, lapped and thereby possibly resulting in greater contact resistance. This ensures that the resistance of the current path 130 is always small with the push button 20 pressed against the input resistance of the electrical ignition device 10.
  • electromagnet 95 and the armature 94 have special contact surfaces, for example in the form of very good conductive metal surfaces and / or in the form of rough surfaces that result in a very low-resistance electrical contact.
  • the contact point for closing the current path 130 is spatially separated from the contact point for opening the current path 130.
  • largely existing components of an existing ignition fuse 1 can be used further, which helps to avoid costly changes in the construction. Furthermore omitted in the inventive design complex adjustment work.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Feeding And Controlling Fuel (AREA)
  • Fuses (AREA)
  • Magnetically Actuated Valves (AREA)
  • Control Of Combustion (AREA)
EP04008590A 2003-04-11 2004-04-08 Zündsicherung Expired - Lifetime EP1467150B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10316642 2003-04-11
DE10316642A DE10316642B4 (de) 2003-04-11 2003-04-11 Zündsicherung

Publications (3)

Publication Number Publication Date
EP1467150A2 EP1467150A2 (de) 2004-10-13
EP1467150A3 EP1467150A3 (de) 2011-01-26
EP1467150B1 true EP1467150B1 (de) 2012-12-26

Family

ID=32864442

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04008590A Expired - Lifetime EP1467150B1 (de) 2003-04-11 2004-04-08 Zündsicherung

Country Status (4)

Country Link
EP (1) EP1467150B1 (pt)
DE (1) DE10316642B4 (pt)
ES (1) ES2402093T3 (pt)
PT (1) PT1467150E (pt)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT508263B1 (de) 2009-11-09 2010-12-15 Anstoss Regelgeraete Ges M B H Ventilvorrichtung sowie verfahren zur thermoelektrischen zündsicherung für gasbetriebene geräte

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2290048A (en) * 1938-12-12 1942-07-14 Milwaukee Gas Specialty Co Safety device for heating and other apparatus
FR68517E (fr) * 1955-08-29 1958-05-02 Bosch Gmbh Robert Appareil à gaz, en particulier fourneau à gaz à allumeur magnétique
DE1256176B (de) * 1965-09-18 1967-12-14 Vaillant Joh Kg Thermoelektrische Zuendsicherung, insbesondere fuer Umlauf-Gaswassererhitzer
BE706986A (pt) * 1966-12-03 1968-04-01
AT301119B (de) * 1970-01-28 1972-08-25 Vaillant Joh Kg Thermoelektrische Zündsicherung, insbesondere für Umlauf-Gaswassererhitzer

Also Published As

Publication number Publication date
EP1467150A3 (de) 2011-01-26
DE10316642B4 (de) 2005-03-31
ES2402093T3 (es) 2013-04-26
PT1467150E (pt) 2013-02-11
DE10316642A1 (de) 2004-11-11
EP1467150A2 (de) 2004-10-13

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