EP3364107B1 - Thermostatventil für gasherde - Google Patents

Thermostatventil für gasherde Download PDF

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Publication number
EP3364107B1
EP3364107B1 EP18157014.4A EP18157014A EP3364107B1 EP 3364107 B1 EP3364107 B1 EP 3364107B1 EP 18157014 A EP18157014 A EP 18157014A EP 3364107 B1 EP3364107 B1 EP 3364107B1
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EP
European Patent Office
Prior art keywords
gas
interception element
valve
valve body
adjustment knob
Prior art date
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Active
Application number
EP18157014.4A
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English (en)
French (fr)
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EP3364107A1 (de
Inventor
Bruno Tullio CRISTINI
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Tmc Srl
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Tmc Srl
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    • 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
    • F23N5/027—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using mechanical means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/26—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid with provision for a retention flame
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/28—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid in association with a gaseous fuel source, e.g. acetylene generator, or a container for liquefied gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2227/00—Ignition or checking
    • F23N2227/22—Pilot burners
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2241/00—Applications
    • F23N2241/02—Space-heating

Definitions

  • the object of the present invention is a thermostatic valve for controlling gas stoves, and a gas stove provided with such a thermostatic valve.
  • the thermostatic valve according to the invention may be used in gas stoves for domestic heating that cannot be connected to a flue gas exhaust duct, for example portable or mobile gas stoves.
  • Gas stoves and among these stoves for domestic use for the heating of interiors that cannot be connected to a flue exhaust duct for which the present invention is particularly intended, generally comprise a tank containing pressurized gas, a tank cock positioned at the outlet of the gas tank to open/close the gas supply duct, a pressure regulator that reduces the gas pressure to a value generally between 28 and 50 mbar (depending on the intended country of use), a thermostatic valve that receives the gas from the pressure regulator and distributes it to a pilot burner and, by adjusting its flow according to the pre-set temperature, towards at least one main burner.
  • the pilot burner which generates the so-called "pilot flame" heats a thermocouple which generates an electric current sufficient to supply an electromagnet, which in turn controls the thermostatic valve.
  • the pilot flame goes out, deactivating the electromagnet and therefore inhibiting the delivery of the gas by the thermostatic valve.
  • thermostatic valve may interrupt the supply of gas to the main burner, but the pilot burner, and therefore the pilot flame, may never be switched off if the tank cock is not closed upstream of the thermostatic valve.
  • thermostats have been proposed that allow compliance with such safety regulation, i.e. the pilot burner is always left lit.
  • such thermostats have not proven to be efficient and economical since, in order to keep the pilot burner lit, a quantity of gas is also passed to the main burner. In practice, the main burner is modulated but it is never switched off completely.
  • thermostatic valves for stoves, convectors, water heaters, boilers and other appliances that require temperature control are known, but they are used in applications that do not have to comply with the safety standard mentioned above, for example, because they are in communication with the external environment.
  • Such thermostatic valves are very efficient as they allow the main burner to be switched off completely.
  • these valves also allow the pilot burner to be switched off manually when the appliance is not in use and for this reason they cannot be used in stoves that must comply with the aforementioned UNI EN 449 standard.
  • An example of a known thermostatic valve is disclosed in publication PP Systems "630 EUROSIT Thermostatic control with HV generator".
  • the object of the present invention is therefore to propose a thermostatic valve for gas stoves which must comply with the safety regulation cited above and which at the same time is able to eliminate the drawbacks of the prior art.
  • a further object of the present invention is to make an existing thermostatic valve compliant with the UNI EN 449 standard, used in applications that allow the pilot burner to be switched off.
  • thermostatic valve for controlling the temperature of a gas stove according to the present invention is indicated collectively at reference number 1.
  • the thermostatic valve 1 comprises a valve body 10 wherein at least one gas inlet duct 12 is connectable to an inlet pipe 120 coming from a tank 102, at least one first gas outlet duct 14 connectable to a first outlet pipe 140 directed to a main burner 104 of the stove 100, and a second gas outlet duct 16 connectable to a second outlet pipe 160 directed to a pilot burner 106.
  • valve body 10 In the valve body 10 is housed at least one first interception element 18 suitable to regulate the passage of gas from the inlet duct 12 to the first outlet duct 14 and a second interception element 20 suitable to regulate the passage of gas from the inlet duct 12 to second outlet duct 16.
  • the first interception element 18 is movable between two end positions, with maximum opening and complete closure of a through-lumen of the gas between the inlet duct 12 and the first outlet duct 14, passing between a plurality of intermediate positions wherein such first interception element may be stopped by a progressive adjustment of the section of the through-lumen of the gas.
  • the second interception element 20 is movable only between an open position and a closed position of a through-lumen of the gas from the inlet duct 12 to the second outlet duct 16.
  • each interception element 18, 20 comprises an axially movable shutter.
  • the valve is manually controlled by an adjustment knob 30 rotatable around a vertical axis, such shutters are movable vertically.
  • the first interception element 18 is axially movable by means of a screw system.
  • the second interception element 20 is normally found in a raised closed position of the respective through-lumen of the gas, made to stay in such position by an elastic element, such as a spring 202.
  • the interception elements 18, 20 further comprise respective first (18') and second (20') actuator stems projecting from the valve body 10.
  • these actuator stems 18', 20' are parallel to each other and protrude vertically from an upper horizontal surface 10' of the valve body 10.
  • the valve 1 further comprises an adjustment knob 30 which may be operated by a user.
  • Such adjustment knob 30 extends above the upper horizontal surface 10' from which the actuator stems 18', 20' protrude.
  • the adjustment knob 30 is suitable to engage the actuator stems 18', 20' and is rotatable between an off position, wherein both the first interception element 18 and the second interception element 20 close the through-lumens of the gas, a stand-by position, wherein the first interception element 18 is controlled by the adjustment knob 30 to prevent the passage of gas from the inlet duct 12 to the first outlet duct 14 and wherein the second interception element 20 allows the passage of the gas from the inlet duct 12 to the second outlet duct 16, and an adjustment position, wherein both the first interception element 18 and the second interception element 20 allow the passage of gas towards the outlet ducts 14, 16.
  • the knob 30 is also axially movable to push the second actuator stem 20' downwards to open the through-lumen of the gas intercepted by the second interception element 20 and thus supply a flow of gas for lighting the pilot burner 106.
  • rotating the adjustment knob 30 causes the rotation of the first actuator stem 18' which screws or unscrews in a threaded hole made in the valve body 10.
  • the first actuator stem 18' is provided with an actuator sprocket 18a which engages with a knob sprocket 18b integral with the adjustment knob 30.
  • the adjustment knob 30 has a lower pilot burner control appendage 302, which, once the second interception element 20 has been pushed into the open position, keeps such interception element in the open position when the knob 30 is rotated in a temperature increasing direction which allows the first actuator stem 18' to rotate in a direction to progressively open the first interception element 18 ( Figure 3a ).
  • the first interception element 18 is progressively closed, and, after the through-lumen of the gas to the main burner 104 is closed by the first interception element (stand-by position), the second actuator stem is disengaged from the lower pilot burner control appendage and may be switched upward, closing the relative through-lumen (completely off position).
  • the adjustment knob 30 is provided with a lower limit switch appendage 304 which delimits, with the lower pilot burner control appendage 302, a shutdown window 306 which allows the second actuating rod 20' to be raised into the closing position.
  • a lower limit switch appendage 304 abutting against an end portion of the second actuator stem 20', prevents the knob 30 from continuing to rotate in the same direction for more than one revolution which would damage the valve.
  • thermostatic valve produced by the company Sit Group under the trade name "630 Eurosit".
  • the operation of this thermostatic valve is therefore known to the person skilled in the art and does not require further explanation.
  • This valve does not comply with the aforementioned UNI EN 449 standard, since, as mentioned, it also allows the pilot burner 106 to be switched off (completely off position).
  • the thermostatic valve is further provided with a stop member 50 suitable to prevent a rotation of the adjustment knob 30 from the stand-by position to the completely off position.
  • This stop member 50 is made in a retaining bracket 52 fixed to the valve body 10 and extending around the adjustment knob 30.
  • a bracket opening 54 is made, for example, of a substantially circular shape, in which the adjustment knob 30 is inserted and which therefore allows the retention bracket 52 to be applied to the thermostatic valve 1 without having to disassemble it.
  • the stop member 50 is composed of a radial retention tooth which extends into the bracket opening 54 so as to engage the lower limit switch appendage 304 ( Figure 3 ), allowing the lower burner control appendage 302 to rotate above it so as to allow the temperature to be adjusted ( Figures 3a and 3b ).
  • the radial retention tooth prevents the shutdown window 306 from coming into contact with the second actuation rod 20', thus preventing its lifting and consequently preventing the interruption of the gas flow toward the pilot burner 106.
  • the retention bracket 52 extends parallel to the upper horizontal surface 10' of the valve body 1'.
  • the retention bracket 52 is shaped in an inverted "U" so as to overlap at least partially with the valve body 10.
  • the retention bracket 52 may, for example, be fixed to the valve body 10 by means of locking screws 55 which connect the opposite side walls 56 of the retention bracket which extend along the sides of the valve body, passing through respective holes 57 formed in the valve body 10.
  • Another object of the present invention is a gas stove 100 for heating interior spaces, provided with the thermostatic valve 1 according to one of the embodiments described above.
  • the stove comprises a tank 102 containing pressurized gas.
  • the tank 102 is of the stove-side type, i.e., it is housed in a tank compartment 102' formed by an external casing 108 of the same stove.
  • the outer casing 108 comprises a base 108' resting on castors 109.
  • the outer casing 108 may further comprise an upper cover 111.
  • the tank 102 is provided with a tank cock 112 suitable for opening/closing the gas inlet pipe 120 connected to the inlet pipe 12 of the thermostatic valve 1.
  • the thermostatic valve distributes the gas to a pilot burner 106 and to at least one main burner 104.
  • the gas stove is also provided with means for regulating or stabilizing the pressure and/or gas flow rate from the tank 102.
  • the stove 100 is also provided with a temperature probe 60 and a thermocouple - not shown - connected to the thermostatic valve 1.
  • the stove 100 is also provided with a pilot flame igniter 70, for example of a piezoelectric type.
  • the adjustment knob 30 and, if present, the pilot flame igniter 70 are accessible from the outside through respective access openings 30', 70' formed in the upper cover 111.
  • access openings 30', 70' are formed in a covering tray 80 positioned in a tray opening 111' formed in the cover 111 and fixed, for example by screws, to the retention bracket 52.
  • the thermostatic valve according to the invention is advantageously based on a temperature control valve of a gas heating apparatus already available on the market and of proven reliability and efficiency.
  • Such valve allows, for example, a complete shutdown of the main burner when the room reaches the desired temperature.
  • the retention bracket according to the invention offers the following advantages:

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Feeding And Controlling Fuel (AREA)

Claims (10)

  1. Thermostatventil zum Steuern bzw. Regeln eines Gasherds, umfassend
    - einen Ventilkörper (10), in den eingebracht ist zumindest ein Gaseinlasskanal (12), der mit einem Einlassrohr (120) aus einem Tank (102) verbunden werden kann, zumindest ein erster Gasauslasskanal (14), der mit einem Austrittsrohr (140) verbunden werden kann, das zu einem Hauptbrenner (104) des Ofens führt, und ein zweiter Gasauslasskanal (16), der mit einem Zündbrenner (106) verbunden werden kann, wobei der Ventilkörper (10) zumindest ein erstes Abfang- bzw. Unterbrechungselement (18), das geeignet ist, den Gasdurchtritt von dem Einlasskanal (12) zu dem ersten Auslasskanal (14) zu regulieren, und ein zweites Abfang- bzw. Unterbrechungselement (20) aufnimmt, das geeignet ist, den Gasdurchtritt von dem Einlasskanal (12) zu dem zweiten Auslasskanal (16) zu regulieren, wobei die Abfangelemente jeweilige erste und zweite Betätigungsstangen (18', 20') umfassen, die von dem Ventilkörper (10) vorstehen;
    - einen Einstellknopf (30), der in die Betätigungsstangen eingreift und der zwischen einer Aus-Position, in der sowohl das erste Abfangelement als auch das zweite Abfangelement den Durchtritt von Gas in Richtung der jeweiligen Auslasskanäle verhindern, einer Stand-By-Position, in der das erste Abfangelement durch den Einstellknopf gesteuert wird, um den Durchtritt von Gas von dem Einlasskanal zu dem ersten Auslasskanal zu verhindern, und in der das zweite Abfangelement den Durchtritt des Gases von dem Einlasskanal zu dem zweiten Auslasskanal ermöglicht, und einer Einstellposition drehbar ist, in der sowohl das erste Abfangelement als auch das zweite Abfangelement den Durchtritt von Gas in Richtung der jeweiligen Auslasskanäle ermöglichen, wobei der Einstellknopf (30) einen unteren Zündbrennersteueranhang (302) aufweist, der, sobald das zweite Abfangelement in die offene Position gedrückt worden ist, ein solches Abfangelement in der offenen Position hält, wenn der Knopf in einer Temperaturerhöhungsrichtung gedreht wird, welche die Drehung der ersten Betätigungsstange in eine Richtung des fortschreitenden Öffnens des ersten Abfangelementes ermöglicht, wobei der Einstellknopf (30) mit einem unteren Endschalteranhang (304) versehen ist, der mit dem unteren Zündbrennersteueranhang (302) ein Abschaltfenster (306) definiert, das das Ansteigen der zweiten Betätigungsstange (20') in die geschlossene Position ermöglicht, wobei der untere Endschalteranhang geeignet ist, gegen einen Endabschnitt der zweiten Betätigungsstange (20') anzuliegen, dadurch gekennzeichnet, dass das Thermostatventil ein Stoppglied (50) umfasst, das geeignet ist, eine Drehung des Einstellungknopfs (30) von der Stand-By-Position zu der vollständigen Aus-Position zu verhindern, wobei das Stoppglied (50) in einer Halteklammer (52) ausgebildet ist, die an dem Ventilkörper (10) befestigt ist und sich um den Einstellknopf (30) herum erstreckt, wobei in der Halteklammer (52) eine beispielsweise im wesentlichen kreisförmige Klammeröffnung (54) ausgebildet ist, durch die sich der Einstellknopf erstreckt, wobei das Stoppglied (50) aus einem radialen Haltezahn besteht, der sich in die Klammeröffnung (54) erstreckt, um in den unteren Endschalteranhang (304) einzugreifen und um dem unteren Zündbrennersteueranhang (302) zu ermöglichen, sich darüber zu drehen.
  2. Ventil nach Anspruch 1, wobei das erste Abfangelement (18) durch ein Schraubensystem axial bewegbar ist.
  3. Ventil nach Anspruch 1 oder 2, bei dem das zweite Abfangelement (20) normalerweise in einer angehobenen geschlossenen Position des jeweiligen Durchgangslumens des Gases ist, das durch ein elastisches Element, wie eine Feder (202), so beeinflusst wird, dass es in einer solchen Position bleibt.
  4. Ventil nach einem der vorhergehenden Ansprüche, wobei der Einstellknopf (30) auch axial bewegbar ist, um die zweiten Betätigungsstange (20') nach unten zu drücken, um das Durchgangslumen des vom zweiten Abfangelement abgefangenen Gases zu öffnen und somit einen Gasstrom zum Zünden des Zündbrenners zuführen.
  5. Ventil nach einem der Ansprüche 2-4, wobei der Einstellknopf (30) durch Drehen die Drehung der ersten Betätigungsstange (18') bewirkt, die in ein im Ventilkörper ausgebildeten Gewindeloch hereingeschraubt oder aus diesem herausgeschraubt wird.
  6. Ventil nach dem vorhergehenden Anspruch, wobei sich der untere Endschalteranhang (304) mehr nach unten erstreckt als der untere Zündbrennersteueranhang (302).
  7. Ventil nach einem der vorhergehenden Ansprüche, wobei sich die Halteklammer (52) parallel zu einer oberen horizontalen Fläche bzw. Oberfläche (10') des Ventilkörpers erstreckt, von der die Betätigungsstangen vorstehen und die als umgekehrtes "U" geformt ist, um den Ventilkörper zumindest teilweise zu überlagern.
  8. Ventil nach dem vorhergehenden Anspruch, wobei die Halteklammer (52) an dem Ventilkörper (10) durch Verriegelungsschrauben (55) angebracht ist, die gegenüberliegende bzw. entgegengesetzte Seitenwände (56) der Halteklammer verbinden, die sich entlang der Seiten des Ventilkörpers erstrecken, wobei sich die Verriegelungsschrauben in entsprechende Löcher (57) einsetzen, die in dem Ventilkörper ausgebildet sind.
  9. Gasherd (100) für Haushaltsheizungen, der nicht mit einen Abgasauslasskanal verbindbar ist, umfassend:
    - einen Tank (102), der unter Druck stehendes Gas enthält, das in einer Tankkammer in dem Ofen untergebracht ist, wobei der Tank mit einem Tankhahn (112) versehen ist, der geeignet ist, den Gasstrom aus dem Tank ein- und auszuschalten;
    - ein Thermostatventil (1) nach einem der vorhergehenden Ansprüche, das über ein Gaseinlassrohr (12) mit dem Tank verbunden ist;
    - einen Hauptbrenner (104), der mit dem ersten Auslasskanal des Thermostatventils verbunden ist;
    - einen Zündbrenner (106), der mit dem zweiten Auslasskanal des Thermostatventils verbunden ist.
  10. Herd nach dem vorhergehenden Anspruch, umfassend eine auf Rollen ruhende Basis.
EP18157014.4A 2017-02-17 2018-02-15 Thermostatventil für gasherde Active EP3364107B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT102017000018185A IT201700018185A1 (it) 2017-02-17 2017-02-17 Valvola termostatica per stufe a gas

Publications (2)

Publication Number Publication Date
EP3364107A1 EP3364107A1 (de) 2018-08-22
EP3364107B1 true EP3364107B1 (de) 2020-04-01

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EP18157014.4A Active EP3364107B1 (de) 2017-02-17 2018-02-15 Thermostatventil für gasherde

Country Status (4)

Country Link
EP (1) EP3364107B1 (de)
ES (1) ES2802240T3 (de)
IT (1) IT201700018185A1 (de)
PT (1) PT3364107T (de)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2319685A (en) * 1943-05-18 Safety control fob gaseous fuel
IT1291436B1 (it) * 1997-03-19 1999-01-11 Sit La Precisa Spa Dispositivo di controllo per bruciatori a gas
US8297317B2 (en) * 2010-01-21 2012-10-30 Lincoln Brass Works, Inc. Gas valve with dual outlets
ITUB20151074A1 (it) * 2015-05-28 2016-11-28 Ego Elektro Geraetebau Gmbh Termostato a due uscite per apparecchi di cottura a gas.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP3364107A1 (de) 2018-08-22
ES2802240T3 (es) 2021-01-18
PT3364107T (pt) 2020-06-29
IT201700018185A1 (it) 2018-08-17

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