EP0039572A1 - Radiant heater - Google Patents

Radiant heater Download PDF

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Publication number
EP0039572A1
EP0039572A1 EP81301870A EP81301870A EP0039572A1 EP 0039572 A1 EP0039572 A1 EP 0039572A1 EP 81301870 A EP81301870 A EP 81301870A EP 81301870 A EP81301870 A EP 81301870A EP 0039572 A1 EP0039572 A1 EP 0039572A1
Authority
EP
European Patent Office
Prior art keywords
tubes
combustion
heater
tube
shield
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Withdrawn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
EP81301870A
Other languages
German (de)
English (en)
French (fr)
Inventor
Anthony Crispin Fells
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.)
Powrmatic Ltd
Original Assignee
Powrmatic Ltd
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 Powrmatic Ltd filed Critical Powrmatic Ltd
Publication of EP0039572A1 publication Critical patent/EP0039572A1/en
Withdrawn legal-status Critical Current

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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
    • F24C1/00—Stoves or ranges in which the fuel or energy supply is not restricted to solid fuel or to a type covered by a single one of the following groups F24C3/00 - F24C9/00; Stoves or ranges in which the type of fuel or energy supply is not specified
    • F24C1/08—Stoves or ranges in which the fuel or energy supply is not restricted to solid fuel or to a type covered by a single one of the following groups F24C3/00 - F24C9/00; Stoves or ranges in which the type of fuel or energy supply is not specified solely adapted for radiation heating
    • F24C1/10—Stoves or ranges in which the fuel or energy supply is not restricted to solid fuel or to a type covered by a single one of the following groups F24C3/00 - F24C9/00; Stoves or ranges in which the type of fuel or energy supply is not specified solely adapted for radiation heating with reflectors
    • 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
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D5/00—Hot-air central heating systems; Exhaust gas central heating systems
    • F24D5/06—Hot-air central heating systems; Exhaust gas central heating systems operating without discharge of hot air into the space or area to be heated
    • F24D5/08—Hot-air central heating systems; Exhaust gas central heating systems operating without discharge of hot air into the space or area to be heated with hot air led through radiators

Definitions

  • the present invention relates to industrial heaters and particularly to radiant heaters using a gaseous fuel.
  • a popular and efficient form of industrial and commercial heater, particularly under adverse draught conditions is a radiant tube heater.
  • a radiant tube heater comprises a tube having one end to which a negative pressure is applied for example as by a centrifugal fan and having the other end attached to or placed immediately adjacent a combustion chamber and fan assembly. Air for combustion is drawn through the burner unit thence through the tube and consequently the tube is heated by the combustion gases, spent gases exhausting through the centrifugal fan which may also be used to dilute products of combustion to an acceptable level.
  • a radiant heater comprising gas fired combustion means, at least two interconnected heating tubes arranged to receive products of combustion from said combustion means to pass sequentially through said tubes, and interconnecting means extending transversely of said tubes and towards an extremity of at least one of said tubes, the arrangement being such that each tube has an extension portion terminating in closure means to allow periodic access for cleaning the tube.
  • the combustion means may be additionally arranged to induce a positive pressure within said first tube thereby to assist the products of combustion to flow about the heating tube and to exhaust to the atmosphere by the other end of said second tube.
  • a plug or cover is provided in each of said tubes to allow internal cleaning of the tubes as a maintenance operation. It is most preferred that with the cover in place a small space remains in use between the internal surface of the cover and the adjacent boundary layer formed by the heat exchange fluid.
  • the space is formed by a coaxial extension of each of said tubes in a direction away from the burner unit, which may include a fan, said cover being externally screwthreaded, and adapted to cooperate with a corresponding internal screw thread in said coaxial extension.
  • a combined reflector and insulative shield which comprises a shaped metal shield adapted for use with a radiant heater, said shield being formed of a shaped metal sheet having adhesively sprayed thereupon a coating of an insulative material the physical properties of the insulative layer being such that it remains adhesively bonded to the shield at all operating temperatures.
  • the physical properties may be the elasticity of the insulative material or it may be that the thermal expansion coefficient of the insulative material is sufficiently akin to that of the shield over the range of temperatures used that no undue stress is placed upon the adhesive bonding.
  • the metal shield is formed into an approximate semi-circular shape, the insulative layer being sprayed onto the convex sides thereof, such that its maximum thickness is toward the median line of the elongate shield.
  • Radiant heater tubes of the present invention comprise in one aspect as shown in Figure 1 a substantially H-shaped radiant heating tube comprising a tube portion 1 conjoining tube portion 2 and final tube portion 3.
  • a combined burner unit associated with a positive pressure inducing fan is supplied as at 5; the burner unit supplying the products of combustion at a positive pressure into the tube 1.
  • the products of combustion flow from the portion 1 via portion 2 and the portion 3 to the exterior at 6.
  • heat is transferred to the walls 1 which are constituted by a nominal 2 inch gas pipe and irradiated from the walls thereof.
  • the plugs 4 and 4' are provided, these being removed with a screwdriver and suitable brush being introduced into the bores.
  • the members 4 and 4' are replaced before the burner unit 5 is restarted.
  • the plugs 4 are set back from the path followed by the heating fluid in pipes 1 and 3.
  • Turbulence is, of course, to be avoided in apparatus of this type since it leads to ununiform heating.
  • the device of Figure 1 is similar in all respects to Figure 1 except that the conjoining tube 2' is somewhat curved to assist fluid flow.
  • the conjoining tube 2' is somewhat curved to assist fluid flow.
  • the plugs should be set back from the wall of the heating tube.
  • FIG 2 a vertical cross-section through a shield and radiant heating assembly is shown.
  • Members 1, 2 and 3 have been described hereinbefore, and the shield which is disposed thereover in use is comprised of a metal sheet 7 bent into a substantially semi-circular configuration having three planar faces.
  • An insulative layer 8 is sprayed onto the convex face thereof such that the insulative layer has its maximum thickness immediately adjacent the heating tubes 1 and 3 when in situ.
  • the insulative layer is selected such that it will key onto the shield 7 and such that it is slightly elastic so that as the shield 7 expands under heat the insulative layer does not become detached therefrom.
  • the present invention includes a radiant heater having a combined burner and fan unit disposed adjacent the inlet to said tube, a burner unit comprising a combined insulative and heat-reflecting shield, and to a method for the improved maintenance of radiant heating tubes which comprises providing removable covers at portions of the tube so that a brush may be introduced to clean the internal bore thereof.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Gas Burners (AREA)
  • Combustion Of Fluid Fuel (AREA)
EP81301870A 1980-04-29 1981-04-28 Radiant heater Withdrawn EP0039572A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8014058 1980-04-29
GB8014058 1980-04-29

Publications (1)

Publication Number Publication Date
EP0039572A1 true EP0039572A1 (en) 1981-11-11

Family

ID=10513065

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81301870A Withdrawn EP0039572A1 (en) 1980-04-29 1981-04-28 Radiant heater

Country Status (3)

Country Link
EP (1) EP0039572A1 (enrdf_load_stackoverflow)
DK (1) DK187981A (enrdf_load_stackoverflow)
GR (1) GR74864B (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007101748A1 (de) * 2006-03-06 2007-09-13 BSH Bosch und Siemens Hausgeräte GmbH Reinigungsvorrichtung zur innenreinigung von einem zumindest bereichsweise gekrümmten rohr

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE337721A (enrdf_load_stackoverflow) *
GB502112A (en) * 1937-09-15 1939-03-13 Gibbons Brothers Ltd Improvements in gas or oil fired heating elements or radiants
FR2270529A1 (enrdf_load_stackoverflow) * 1974-05-08 1975-12-05 Radiant Tube Systems Ltd
FR2404812A1 (fr) * 1977-09-29 1979-04-27 Gruenzweig & Hartmann Montage Chauffage a rayonnement du plafond pour magasins et batiments analogues

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE337721A (enrdf_load_stackoverflow) *
GB502112A (en) * 1937-09-15 1939-03-13 Gibbons Brothers Ltd Improvements in gas or oil fired heating elements or radiants
FR2270529A1 (enrdf_load_stackoverflow) * 1974-05-08 1975-12-05 Radiant Tube Systems Ltd
GB1448073A (en) * 1974-05-08 1976-09-02 Radiant Tube Systems Ltd Space heating systems and apparatus
FR2404812A1 (fr) * 1977-09-29 1979-04-27 Gruenzweig & Hartmann Montage Chauffage a rayonnement du plafond pour magasins et batiments analogues

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007101748A1 (de) * 2006-03-06 2007-09-13 BSH Bosch und Siemens Hausgeräte GmbH Reinigungsvorrichtung zur innenreinigung von einem zumindest bereichsweise gekrümmten rohr

Also Published As

Publication number Publication date
GR74864B (enrdf_load_stackoverflow) 1984-07-12
DK187981A (da) 1981-10-30

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT LU NL SE

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19821016

RIN1 Information on inventor provided before grant (corrected)

Inventor name: FELLS, ANTHONY CRISPIN