EP0282838B1 - Appareil de chauffage à gaz par rayonnement - Google Patents

Appareil de chauffage à gaz par rayonnement Download PDF

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Publication number
EP0282838B1
EP0282838B1 EP88103363A EP88103363A EP0282838B1 EP 0282838 B1 EP0282838 B1 EP 0282838B1 EP 88103363 A EP88103363 A EP 88103363A EP 88103363 A EP88103363 A EP 88103363A EP 0282838 B1 EP0282838 B1 EP 0282838B1
Authority
EP
European Patent Office
Prior art keywords
fitted
mixing chamber
burner
gas
tube
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
EP88103363A
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German (de)
English (en)
Other versions
EP0282838A1 (fr
Inventor
Stefano Nucci
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.)
Omc SpA
Original Assignee
Omc SpA
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Filing date
Publication date
Application filed by Omc SpA filed Critical Omc SpA
Priority to AT88103363T priority Critical patent/ATE75838T1/de
Publication of EP0282838A1 publication Critical patent/EP0282838A1/fr
Application granted granted Critical
Publication of EP0282838B1 publication Critical patent/EP0282838B1/fr
Anticipated expiration legal-status Critical
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C3/00—Stoves or ranges for gaseous fuels
    • F24C3/08—Arrangement or mounting of burners
    • F24C3/082—Arrangement or mounting of burners on stoves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C3/00—Combustion apparatus characterised by the shape of the combustion chamber
    • F23C3/002—Combustion apparatus characterised by the shape of the combustion chamber the chamber having an elongated tubular form, e.g. for a radiant tube

Definitions

  • This invention relates to a radiant heater designed to heat surfaces without substantially altering the temperature of the surrounding air. It is therefore particularly suitable for use in open air environments such as public transport shelters, loading and unloading areas, sports ground terraces, etc.
  • the heater in accordance with the invention is fitted with a gas burner. Its characteristic feature is the special arrangement of the parts which facilitates construction and maintenance of the heater, reduces its size, and makes it very easy to regulate and therefore extremely practical.
  • These types of heater generally consist of a burner and equipment which causes the heated air to run through a radiant tube.
  • BE-A-665772 describes a radiant heater comprising a radiant tube constituting the combustion chamber, a burner fitted to one end of said radiant tube and burnt gas exhausting equipment fitted at the other end, whereby the burner consists of a pre-mixing chamber coaxial with the said radiant tube and an electrode, fitted at the exit, designed to light the gas issuing from a nozzle coaxial with said pre-mixing chamber, said burner being fitted to the radiant tube via a flange.
  • DE-A-2229763 shows a radiant heater having a negative pressure sensor placed at the tube outlet.
  • This invention relates to a gas-fired radiant heater according to claim 1.
  • the heater in accordance with the invention basically consists of a U-shaped radiant tube 1, fitted at one end with an assembly comprising a burner with relative control and fuel supply devices, the whole assembly being marked 2, and at the other, with smoke exhausting equipment marked 3.
  • the heater is completed by reflector panel 4, preferably having a seagull-wing shape as illustrated in Figure 4.
  • Radiant tube 1 can be made of various materials, although carbon steel has proved particularly suitable as it presents high emissivity which facilitates heat transfer by radiation.
  • Burner 2 comprises a pressure reducer 5, fitted with a gas by-pass solenoid valve and connected to a nozzle 6 from which the gas exits and is sent to pre-mixing chamber 7.
  • a starting electrode 9 is located near the exit of the pre-mixing chamber, while a probe 8 is situated near the inlet of tube 1 and connected to a negative pressure switch which acts in a known way on the solenoid valve supplying pressure reducer 5.
  • the pressure reducer, nozzle, negative pressure switch and various electronic and electromechanical control devices are housed in a container 12 which is integral with a sleeve 13. The latter is inserted into the end of radiant tube 1, where it is locked into position by tightening a pair of bolts (14) or similar.
  • Pre-mixing chamber 7 is basically cylindrical, coaxial with sleeve 13 and tube 1, and fixed to the front wall of container 12.
  • a flame trap 15 is fitted at the end of the pre-mixing chamber which penetrates inside radiant tube while a similar trap 16 is fitted in a recessed position in pre-mixing chamber 7.
  • holes 17 are drilled in the wall of the pre-mixing chamber, near the rear end fixed to container 12, to permit the passage of a quantity of comburent air.
  • the dimensions of the holes are calculated so that less than the stoichiometric quantity of comburent air enters the air-gas mixture.
  • sleeve 13 also coaxial with radiant tube 1 and fitted with a flame trap.
  • Sensor 19 of a flame ionisation detector is fitted near the exit of the pre-mixing chamber; this device is not illustrated in detail, as it is of a known type.
  • Exhausters 3 also fixed to tube 1 via a sleeve 20, are fitted at the opposite end of radiant tube 1.
  • These exhausters basically consist of a fan 21 driven by a motor 22 and fitted with an auxiliary impeller, not shown in the figure, which supplies a current of air sufficient to cool the shaft of main fan 21.
  • the heater operates as follows: When the heater is switched on, the electronic devices in container 12 check for malfunctions in the apparatus, and if there are none, send the enable signal so that motor 22 can be started up. Fan 21 is then activated, and exhausts any smoke or unburnt deposits from the inside of the radiant tube which could cause explosion when the burner is lit.
  • Air is exhausted from inside the chamber by fan 21, creating negative pressure in tube 1. This is detected by negative pressure switch 10 which sends the burner activation signal when the set value is reached.
  • the negative pressure switch probe is located at the entrance (unlike those of similar types of heater) means safer heater operation, because in this position the sensor can detect any obstacle to smoke circulation in radiant tube 1, due, for example, to obstruction or breakdown of the exhauster.
  • the negative pressure switch enables opening of the solenoid valve and activation of electrode 9 via the control devices.
  • the gas then issues from nozzle 6 and passes into chamber 7 where it is partly mixed with a quantity of air sucked in through holes 20.
  • the mixture sucked in by the negative pressure in the tube, crosses flame trap 15 and is set alight by electrode 9.
  • the operation of the burner is then monitored by sensor 19 of the ionisation detector.
  • the flame travels along the first straight stretch of tube 1, heating it up to a temperature of 250-400°C. After passing through the central curved stretch, the smoke continues towards the outlet, releasing a further quantity of heat to the wall of tube 1, and is then evacuated by fan 21.
  • This system means that the burner can be removed easily and quickly for servicing, with no need to work in awkward positions or dismantle the entire heater.
  • combustion chamber is totally separated from container 12, which houses the pressure reducer and gas supply parts, eliminates the risk of explosions due to backflashes in the event of gas leaks.
  • Flame trap 15 at the end of the pre-mixing chamber is also designed to elimninate backflashes, while the second trap 16 is particularly important; in addition to constituting a further flame trap to protect nozzle 6 if the first trap should fail to do its job due to wear or other reasons, it also helps distribute the air-gas mixture evenly over the burner head.
  • cylindrical pre-mixing chamber is coaxial with tube 1 means that an air filter can be inserted into the space between the two, this being particularly useful in dusty environments.

Claims (6)

  1. Appareil de chauffage à gaz par rayonnement, du type comportant un tuyau radiant (1) constituant la chambre de combustion, un brûleur (2) appliqué à une extrémité de ce tuyau radiant et dispositifs (3) pour l'aspiration du gaz brûlé à l'autre extrémité, dit brûleur consistant en une chambre de pre-mélange (7) coaxiale avec dit tuyau radiant (1), et en une électrode (9) placée à la sortie de la chambre de pre-mélange (7) pour incendier le gaz provenant d'un gicleur (6) coaxial avec dite chambre de pre-mélange (7), caractérisé en ce que ledit brûleur (2) est appliqué au tuyau radiant (1) par un manchon (13) coulissant axialement le long dedit tuyau (1) et peut être bloqué en toute position, dit appareil de chauffage à gaz par rayonnement comporte des dispositifs (10) pour détecter les variations de pression à l'entrée de la chambre de combustion, lesdits dispositifs enclenchant les dispositifs de contrôle du brûleur et les dispositifs d'alimentation du gaz et de controle de l'appareil de chauffage sont placés dans une boite séparée de la chambre de combustion et fixèe au manchon (13) de support du brûleur.
  2. Appareil de chauffage à gaz par rayonnement selon la revendication 1, caractérisé en ce que un détecteur de flamme (19) à ionisation connecté aux dispositifs de controle de l'appareil de chauffage, est placé à la sortie de dite chambre de pre-mélange (7).
  3. Appareil de chauffage à gaz par rayonnement selon les revendications 1 ou 2, caractérisé en ce que un filet casse-flamme (15) est placé à la sortie de dite chambre de pre-mélange (7).
  4. Appareil de chauffage à gaz par rayonnement selon la revendication 3, caractérisé en ce que un deuxième filet casse-flamme (16) est placé dans dite chambre de pre-mélange (7) en position intérieuse, ayant aussi la fonction de distribuer uniformément le mélange air-gaz sur la culasse du brûleur.
  5. Appareil de chauffage à gaz par rayonnement selon la revendication 1, caractérisé en ce qu'il comporte des dispositifs pour diviser l'air à l'entrée en un premier flux qui va être mélangé avec le gaz dans la chambre de pre-mélange (7) et en un deuxième flux qui va être envoyé à la sortie de dite chambre de pre-mélange.
  6. Appareil de chauffage à gaz par rayonnement selon la revendication 5, caractérisé en ce que dit manchon (13) comporte plusieurs fentes (18) pour le passage d'air froide dirigée vers la chambre de combustion, et dite chambre de pre-mélange (7) a des fentes (17) pour permettre l'entrée d'une quantité d'air inférieure à la quantité stoechiométrique.
EP88103363A 1987-03-18 1988-03-04 Appareil de chauffage à gaz par rayonnement Expired - Lifetime EP0282838B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88103363T ATE75838T1 (de) 1987-03-18 1988-03-04 Gasbefeuerter heizstrahler.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT3350987U 1987-03-18
IT8733509U IT213457Z2 (it) 1987-03-18 1987-03-18 Apparecchiatura di riscaldamento ad irraggiamento alimentato a gas

Publications (2)

Publication Number Publication Date
EP0282838A1 EP0282838A1 (fr) 1988-09-21
EP0282838B1 true EP0282838B1 (fr) 1992-05-06

Family

ID=11237602

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88103363A Expired - Lifetime EP0282838B1 (fr) 1987-03-18 1988-03-04 Appareil de chauffage à gaz par rayonnement

Country Status (5)

Country Link
EP (1) EP0282838B1 (fr)
AT (1) ATE75838T1 (fr)
DE (1) DE3870682D1 (fr)
ES (1) ES1005388Y (fr)
IT (1) IT213457Z2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1798470A1 (fr) 2005-12-13 2007-06-20 Schwank GmbH Dispositif de chauffage et son procédé de fonctionnement

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5361750A (en) * 1993-06-14 1994-11-08 Roberts-Gordon, Inc. Burner assembly
GB9515313D0 (en) * 1995-07-26 1995-09-20 Redrex Ltd Improvements in or relating to gas-fired radiant tube heaters
DE19820795C2 (de) * 1998-02-26 2001-03-01 Tulowietzki Heinrich Otto Vorrichtung zum Beheizen von Räumen
ITPD20050133A1 (it) * 2005-05-11 2006-11-12 Systema Spa Impianto di riscaldamento a tubi radianti
IT201600084075A1 (it) * 2016-08-09 2018-02-09 Carlieuklima S R L Impianto di riscaldamento a condotti radianti

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE665672A (fr) *
DE587073C (de) * 1932-02-02 1933-10-30 Schwarz & Berckenkamp G M B H Gasbrenner fuer Kocher, Herde u. dgl.
GB471331A (en) * 1936-03-03 1937-09-02 Eugene Oscar Engels Improvements in and relating to oil burners for furnaces
US2796118A (en) * 1954-07-21 1957-06-18 Hanck Mfg Co Burner for tube firing
DE2229763A1 (de) * 1972-06-19 1974-01-10 David R Lord Ltd Heizvorrichtung

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1798470A1 (fr) 2005-12-13 2007-06-20 Schwank GmbH Dispositif de chauffage et son procédé de fonctionnement

Also Published As

Publication number Publication date
IT8733509V0 (it) 1987-03-18
ATE75838T1 (de) 1992-05-15
IT213457Z2 (it) 1989-11-27
DE3870682D1 (en) 1992-06-11
ES1005388U (es) 1988-11-01
ES1005388Y (es) 1989-05-01
EP0282838A1 (fr) 1988-09-21

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