GB2443840A - Radiant heating unit and method of maintaining the temperature of a radiant heating element pinch seal - Google Patents

Radiant heating unit and method of maintaining the temperature of a radiant heating element pinch seal Download PDF

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Publication number
GB2443840A
GB2443840A GB0622831A GB0622831A GB2443840A GB 2443840 A GB2443840 A GB 2443840A GB 0622831 A GB0622831 A GB 0622831A GB 0622831 A GB0622831 A GB 0622831A GB 2443840 A GB2443840 A GB 2443840A
Authority
GB
United Kingdom
Prior art keywords
heating element
radiant heating
heating unit
housing
thermally
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Withdrawn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
GB0622831A
Other versions
GB0622831D0 (en
Inventor
Stephen Grant Arnold
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.)
SABRING Ltd
Original Assignee
SABRING 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 SABRING Ltd filed Critical SABRING Ltd
Priority to GB0622831A priority Critical patent/GB2443840A/en
Publication of GB0622831D0 publication Critical patent/GB0622831D0/en
Publication of GB2443840A publication Critical patent/GB2443840A/en
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/52—Cooling arrangements; Heating arrangements; Means for circulating gas or vapour within the discharge space
    • H01J61/523—Heating or cooling particular parts of the lamp
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/0033—Heating devices using lamps
    • H05B3/0071—Heating devices using lamps for domestic applications
    • H05B3/008—Heating devices using lamps for domestic applications for heating of inner spaces
    • 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
    • F24C7/00—Stoves or ranges heated by electric energy
    • F24C7/06—Arrangement or mounting of electric heating elements
    • F24C7/062—Arrangement or mounting of electric heating elements on stoves
    • F24C7/065—Arrangement or mounting of electric heating elements on stoves with reflectors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K1/00—Details
    • H01K1/58—Cooling arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • F21V29/74—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/032—Heaters specially adapted for heating by radiation heating

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Resistance Heating (AREA)

Abstract

A radiant heating unit (10, fig. 1) comprises a housing (12, fig. 1) having a body 14 which is thermally conductive and a window (16, fig.6) which is generally transparent to heat radiation. A heating element 22 is mounted within the housing and is arranged to emit heat radiation through the window. A deformable thermally-conductive linking conductor 48, such as braided wire, is provided in thermal communication with the heating element and the body. Preferably, the linking conductor thermally contacts the heating element on at least part of a pinch seal of the heating element to thereby cool the pinch seal. The housing may comprise external protrusions, such as a plurality of heat sinking fins (40, fig.2), thermally connected to the body for dissipating heat. Preferably, the window comprises a glass panel and a seal (18, fig.1) to seal the heating element within the housing. In operation, the sealed radiant heating unit is particularly suited to outdoor use. A method of maintaining the temperature of a pinch seal of a radiant heating element below a predetermined value is also disclosed.

Description

A RADIANT HEATING UNIT AND PIETHOD FOR CONTROLLING THE
TEMPERATURE OF A RADIANT HEATING ELEMENT
The invention relates to a radiant heating unit and a method of controlling the temperature of a heating element within a radiant heating unit, in particular maintaining the temperature of a pinch seal of the heating element below a predetermined level. The invention is particularly concerned with sealed radiant heating units for outdoor use but the invention is equally applicable to heating units which are to be used indoors.
Quartz halogen heaters operate under the principle of heat radiation and typically emit radiation in the infrared band of the electromacmetic freauencv soectrum.
Their operation is similar to that of the sun and they generally warm objects rather than the surrounding air.
The heat rays are partially absorbed and partially reflected by the surfaces they strike and are thus very useful for instant heat and for heating large areas with high air movement, in particular outdoor areas.
Known outdoor radiant heating units have a heating element which is fully enclosed in a sealed housing to protect the electrical connections from dust and water ingress. However, it has been found that the temperature of a pinch seal of a quartz halogen heating element in an enclosed environment may easily reach 400-450 C. The equivalent temperature in an open environment has been measured at, for example, between 200-250 C. The increased pinch seal temperature has been found to reduce the operating life of a quartz halogen heating element to typically fewer than 500 hours. By contrast, the operating lifetime of a quartz halogen heating element in an open enclosure is typically over 5000 hours.
EP-A-0959304 discloses a radiant heater having a reduced internal operating temperature. The radiant heater mounts heating elements in a sealed housing with a ceramic heat transmitting wall. A fan is mounted in the housing to cool the heating elements and in practice provide additional heat. There are also vent assemblies which prevent water such as rainwater or even water from, for example, a hose entering into the heater and causing failure. The solution proposed is expensive, complicated and requires increased maintenance. Firstly, a fan is required to provide sufficient circulation of air within the housing. Secondly, specially dsignr ent crb1ie are required to allow air to enter the enclosure while preventing the ingress of water. Additionally, airborne dust and smoke particles, for example, may be sucked into the enclosure by the fan.
GB-A-1181307 published in 1970 discloses improvements in heat sinks for electric lamps. A holder is provided for a tubular electric lamp comprising a support for one end of the lamp and a pair of levers each pivoted on the support and arranged to engage the lamp at or near said one end of the lamp to conduct heat from the lamp to the support. This solution is expensive to manufacture because of the pair of pivotable levers complicating the design of the holder. Additionally, heat is merely transferred from the electric lamp to the holder and so if, for example, the holder were to be in a sealed housing, the internal operating temperature would not be reduced.
An object of the present invention is to provide a radiant heating unit wherein the heating element has an improved lifetime. A further object of the invention is to achieve the improved lifetime while maintaining the dust and water ingress protection of a fully enclosed heating unit.
According to the present invention there is provided an apparatus and method as set forth in the appended claims. Preferred features of the invention will be apparent from the dependent claims, and the description which follows.
According to a first aspect of the invention there is provided a radiant heating iinH cpr i; having a body which is thermally conductive and a window which is generally transparent to heat radiation, a heating element mounted within the housing and arranged to emit heat radiation through the window, and a deformable thermally-conductive linking conductor in thermal communication with the heating element and the body.
In this way, heat from the heating element is conducted away by the linking conductor and body of the heating unit, thereby keeping the temperature of the heating element below a predetermined value critical to the operational lifetime of the heating element.
Preferably, the linking conductor is braided wire. In this way, the linking conductor can deform to complement the shape of the heating element to thereby increase the surface area available for conduction of heat.
Advantageously, the linking conductor is held in thermally conductive contact with the heating element by a holding member. In this way, thermal contact between the linking conductor and heating element is improved and is less likely to be interrupted by movement of the flexible linking conductor.
The holding member and linking conductor may be commonly connected to the body of the housing. In this way, assembly of the heating unit can be made more straightforward thereby reducing cost.
In a preferred embodiment, the heating element is tubular and is mounted in the housing by two opposite inwardly-facing connectors. and thr t'o!inki; conductors arranged to be in thermally conductive contact with the heating element. Preferably, the two linking conductors contact the heating element at a surface at or near the connectors. Preferably still, the linking conductor thermally contacts the heating element on at least part of a pinch seal of the heating element to thereby cool the pinch seal. In this way, the pinch seal is directly protected from a high operating temperature, further prolonging the operational lifetime of the heating element.
Advantageously, the housing comprises external protrusions for dissipating heat which are thermally connected to the body, so that dissipation of heat received from the heating element is increased.
Preferably, the external protrusions are a plurality of heat sinking fins.
The window may comprise a glass panel and seal to seal the heating element within the housing.
According to a second aspect of the invention, there is provided a method of maintaining the temperature of a pinch seal of a radiant heating element below a predetermined value, including placing a flexible thermally-conductive linking conductor into thermal contact with the radiant heating element on at least part of the pinch seal, holding the linking conductor against the heating element, and thermally connecting the linking conductor to a heat sinking body to draw heat from the radiant heating element.
For a better understandina of fh intrentin, show how embodiments of the same may be carried into effect, reference will now be made, by way of example, to the accompanying diagrammatic drawings in which: Figure 1 is an exploded perspective view of a heating unit in accordance with the invention; Figure 2 is a top plan view of the heating unit of Figure 1; Figure 3 is a bottom plan view of the heating unit of Figure 1; Figure 4 is a side view of the heating unit of Figure 1; Figure 5 is a front view of the heating unit of Figure 1; Figure 6 is a cross-sectional view on AA of Figure 5; Figure 7 is a close-up front view of a clip in a closed position in accordance with the invention; Figure 8 is a close-up view of the clip of Figure 7 in an open position; Figure 9 is a close-up side view of the clip of Figure 7; Figure 10 is a close-up side view of the clip of Figure 7 shown in location against a heating element.
Figure 11 is a front view of a rpf1r'tr in Figure 1 with the heating element and connectors removed.
Figure 12 is a partial close-up side view of a clip and heating element according to a second embodiment of the invention; Figure 13 is a close-up end elevation of the clip and heating element of Figure 12; The heating unit 10 of the present invention will now be described with reference to the accompanying drawings.
Figure 1 shows a radiant heating unit 10 according to a preferred embodiment of the invention. The radiant heating unit 10 comprises a sealed housing 12, a wall-mounting bracket 13 and a mains electricity connection box 15.
The housing 12 comprises a body 14 of cast aluminium and a front panel 16 of glass. The body 14 has a partially open front face defining an internal cavity.
The front panel 16 is fitted to the open front face of the body 14 via a seal 18, and is held in place by a front cover 20. A quartz halogen heating element 22 is mounted within the cavity of the housing 12 between a pair of spring contact connectors 24 which are attached to the body 14 by mounts 26.
A reflector 28 is positioned between the heating element 22 and the body 14. The reflector 28 is arranged such that infrared radiation is reflected from the heating element 22 through the front panel 16 in use.
The body 14 is also provided with two cup-like lamp recesses 30 on the front face thereof. The lamp recesses each hold a halogen spot lamp 32 by a connector 33 so that in use visible light is directed through the front panel 16 in the direction the heating unit 10 is facing.
Figure 2 shows a top plan view of the heating unit 10.
A plurality of heat sinking fins 40 extend in rows across the top surface of the body 14 from the front face to beyond the opposite rear face and continue along the rear face, wrapping around the body to finish on the bottom surface of the body as shown in Figure 3. Figure 4 shows the U-shaped profile of the heating fins 40. Three wall-mounting protrusions 41 are located on the rear surface of the body 14 for connection with the wall-mounting bracket 13. Each protrusion 41 extends beyond the heat sinking fins 40 to mate with the mounting bracket 13.
The external surface of each cup-like iamp recess 30 has a plurality of heat sinking fins 42 extending longitudinally along the outer surface thereof.
Figure 5 is a front view of the heating unit 10 and shows the heating element 22 located within the body 14.
In particular, two clips 46 at opposite ends of the heating element 22 each hold a flexible conductor 48 (not shown in Figure 5) against the heating element 22. Each clip 46 is positioned adjacent the respective spring contact connectors 26 at respective pinch seals of the heating element 22.
Figure 6 is a section on A-A of Figure 5 and with Figures 7, 8 and 9 show a clip 4E iii mrre det 1. Thc li1, 46 is formed of a folded length of flexible steel folded twice to create two relatively long outstanding arms 47 pivotable in relation to a relatively shorter base 49. A clip closure member 51 extends from one arm 47 to the other arm 47 to hold the arms in position in use.
The clip 46 is arranged to contain a flexible conductor 48 comprising a length of nickel plated copper braid sealed at both ends by seals 49 to prevent fraying.
The flexible conductor 48 and the clip 46 are held together by a screw fitting 50 which mates with a protrusion 52 on the body 14. A copper ferrule 54 is positioned between the screw fitting 50 and the flexible conductor 48 to enable the flexible conductor to be securely fastened to the body 14. The flexible conductor 48 has two free ends which follow the inside surface of the clip to contact the heating element 22 in use.
Figure 7 shows the clip 46 in a closed position with the closure member 51 arranged in a closed configuration.
The flexible conductor 48 is pressed against the heating element. The skilled person will understand that the braid deforms to wrap itself around the heating element in use.
This allows a greater contact area between the heating element 22 and the flexible conductor 48 to be created, aiding the conduction of heat therebetween. Additionally, the braid can be easily manipulated out of position when the heating element is to be replaced, and back into position thereafter.
Figure 8 shows the clip 46 in an open position with the flexible conductor 48 removed for clarity. The clip 46 has inwardly facing protrusions 5 t a pczitiT corresponding to the heating element 22 so that, in use, the flexible conductor 48 is firmly pressed against the pinch seal of the heating element 22 to effect a good thermally conductive contact.
Figure 9 shows a side view of the clip 46.
Figure 10 shows one of the clips 46 acting to press a flexible conductor 48 against the heating element 22 at a position adjacent one of the spring contact connectors 24.
The mount 26 is held in place against the protrusion 52 by the screw fixing 50 and the clip 46.
Figure 11 shows the reflector 28 in more detail. The reflector 28 has two rectangular cut-outs 60 positioned behind the heating element 22 at or near respective ends thereof. In this way, heat incident on the surface of the heating elements at the pinch seal adjacent the connectors 24 as a result of reflection is reduced.
In use, when the heating element 22 is powered on, the internal temperature of the sealed housing 12 of the heating unit 10 rises due to heat convection generated by the internal workings of the heating element 22 and radiated heat incident on the reflector and other internal surfaces of the housing 12. The temperature of each pinch seal of the heating element 22 rises. The housing 12 is sealed and so the internal temperature of the housing also rises.
Left unchecked, the pinch seal temperature of the heating element 22 would soon pass throucih critizl value. Operating the heating element 22 with a pinch seal temperature above this value dramatically shortens the life of the element. The applicant has found that by keeping the pinch seal temperature below a temperature of 350 C, the heating elements exhibit prolonged lifetimes.
The term pinch seal is generally used in the art. For the avoidance of doubt, the pinch seal of a quartz halogen heating element is the flat end piece where the tubular element is pinched" to form a connection to a power supply. In particular, the pinch seal is where the heating element electrode joins a foil connector.
The flexible conductors 48 of the invention act to conduct heat away from the pinch seal of the heating element 22. The heat is conducted to the body 16. The external surface of the body then dissipates the excess heat via the heat conducting fins 40. Additionally, the cut-outs 60 act to mitigate the effect of radiation ii reflected onto the heating element 22 by the reflector 22.
In this way, the pinch seal of the heating element 22 can cool sufficiently to remain below the critical operating temperature of 350 C, thus prolonging the life of the heating element 22.
A second embodiment of the invention is now described with reference to Figures 12 and 13. The same reference numerals apply and only the differences are described. The protrusion 52 is replaced by an aluminium block 152. The clip 46 is formed of two outwardly projecting inverted Y-shaped members 146. The innermost edges of each member 146 are connected to a front facing surface of the aluminium block 152. The outermost edge of each member 146 is angled inwardly to form nvl'ij fl;c 1C.
The flanges 164 each have a central hole to receive a pin 166 to hold the clip 146 in a closed position. The flexible conductor 48 is formed of two shorter lengths of braid 148 each having an eyelet 162 at one end thereof.
Each eyelet is used to attach the braid 148 to opposite sides of the aluminium block 152. Each length of braid 148 wraps around the aluminium block 152, through the inverted Y of respective member 146 and along the inner surface thereof to contact the heating element 22.
Although two preferred embodiments have been shown and described, it will be appreciated by those skilled in the art that various changes and modifications might be made without departing from the scope of the invention, as defined in the appended claims.
For example, the heating unit 10 of the above embodiments uses infrared radiation to heat external objects. The skilled person would understand that radiation at frequencies outside of the infrared band in the electromagnetic spectrum may also be used. Also, for the avoidance of doubt, the term "radiant" is a term of art commonly used to distinguish heating units of the type described herein from other types of heating units which work on the principle of heat convection.
Additionally, it is envisaged that any suitable form of flexible or deformable conductor could be used, with or without a corresponding clip to press the flexible conductor against the heating element, and the invention is not restricted to braided wire.
Furthermore, it is anticipated that heating elements other than quartz halogen may be used. Accordingly, critical pinch seal operating temperatures of more or less than 350 C are foreseeable, and therefore larger or smaller flexible conductors could be used in conjunction with larger or smaller heat sinking fins.
Attention is directed to all papers and documents which are filed concurrently with or previous to this specification in connection with this application and which are open to public inspection with this specification, and the contents of all such papers and documents are incorporated herein by reference.
All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and/or all of the steps of any method or process so disclosed, may be combined in any combination, except combinations where at least some of such features and/or steps are mutually exclusive.
Each feature disclosed in this specification
(including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise. Thus, unless expressly stated otherwise, each feature disclosed is one example only of a generic series of equivalent or similar features.
The invention is not restricted to the details of the foregoing embodiment(s). The invention extends to any novel one, or any novel combination, of the features
disclosed in this specification (incluc9incj y
accompanying claims, abstract and drawings), or to any novel one, or any novel combination, of the steps of any method or process so disclosed.

Claims (12)

  1. Claims 1. A radiant heating unit comprising: a housing having a body
    which is thermally conductive and a window which is generally transparent to heat radiation; a heating element mounted within the housing and arranged to emit heat radiation through the window; and a deformable thermally-conductive linking conductor in thermal communication with the heating element and the body.
  2. 2. The radiant heating unit according to claim 1, wherein the linking conductor is braided wire.
  3. 3. The radiant heating unit according to claim 1 or claim 2, wherein the linking conductor is held in thermally conductive contact with the heating element by a holding member.
  4. 4. The radiant heating unit according to any of claims 1 to 3, wherein the holding member and linking conductor are commonly connected to the body of the housing.
  5. 5. The radiant heating unit according to any preceding claim, wherein the heating element is tubular and is mounted in the housing by two opposite inwardly-facing connectors, and wherein there are two linking conductors arranged to be in thermally conductive contact with the heating element.
  6. 6. The radiant heating unit according to claim 5, wherein the two linking conductors contact the heating element at a surface at or near the connectors.
  7. 7. The radiant heating unit according to any preceding claim, wherein the linking conductor thermally contacts the heating element on at least part of a pinch seal of the heating element to thereby cool the pinch seal.
  8. 8. The radiant heating unit according to any preceding claim, wherein the housinq comoris rter1 protrusions for dissipating heat thermally connected to the body, so that dissipation of heat received from the heating element is increased.
  9. 9. The radiant heating unit according to claim 8, wherein the external protrusions are a plurality of heat sinking fins.
  10. 10. The radiant heating unit according to any preceding claim, wherein the window comprises a glass panel and seal to seal the heating element within the housing.
  11. 11. The radiant heating unit as substantially described herein with reference to the accompanying drawings.
  12. 12. A method of maintaining the temperature of a pinch seal of a radiant heating element below a predetermined value, including: placing a deformable thermally-conductive linking conductor into thermal contact with the pinch seal of the radiant heating element; holding the linking conductor against the heating element; and thermally connecting the linking conductor to a heat sinking body to draw heat from the radiant heating element.
GB0622831A 2006-11-16 2006-11-16 Radiant heating unit and method of maintaining the temperature of a radiant heating element pinch seal Withdrawn GB2443840A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0622831A GB2443840A (en) 2006-11-16 2006-11-16 Radiant heating unit and method of maintaining the temperature of a radiant heating element pinch seal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0622831A GB2443840A (en) 2006-11-16 2006-11-16 Radiant heating unit and method of maintaining the temperature of a radiant heating element pinch seal

Publications (2)

Publication Number Publication Date
GB0622831D0 GB0622831D0 (en) 2006-12-27
GB2443840A true GB2443840A (en) 2008-05-21

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Family Applications (1)

Application Number Title Priority Date Filing Date
GB0622831A Withdrawn GB2443840A (en) 2006-11-16 2006-11-16 Radiant heating unit and method of maintaining the temperature of a radiant heating element pinch seal

Country Status (1)

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GB (1) GB2443840A (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1060533A (en) * 1965-02-15 1967-03-01 Gen Electric Co Ltd Improvements in or relating to heat transfer devices and to electric lighting fittings incorporating such devices
US3751657A (en) * 1970-12-16 1973-08-07 Keene Corp Lighting fixture for high intensity lamps
US4678959A (en) * 1984-11-15 1987-07-07 U.S. Philips Corporation Device for cooling the pinch seal of an electric lamp, and an electric lamp and an irradiation apparatus provided with this cooling device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1060533A (en) * 1965-02-15 1967-03-01 Gen Electric Co Ltd Improvements in or relating to heat transfer devices and to electric lighting fittings incorporating such devices
US3751657A (en) * 1970-12-16 1973-08-07 Keene Corp Lighting fixture for high intensity lamps
US4678959A (en) * 1984-11-15 1987-07-07 U.S. Philips Corporation Device for cooling the pinch seal of an electric lamp, and an electric lamp and an irradiation apparatus provided with this cooling device

Also Published As

Publication number Publication date
GB0622831D0 (en) 2006-12-27

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