GB2068524A - Inspection lamp with forced air cooling system - Google Patents

Inspection lamp with forced air cooling system Download PDF

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Publication number
GB2068524A
GB2068524A GB8002889A GB8002889A GB2068524A GB 2068524 A GB2068524 A GB 2068524A GB 8002889 A GB8002889 A GB 8002889A GB 8002889 A GB8002889 A GB 8002889A GB 2068524 A GB2068524 A GB 2068524A
Authority
GB
United Kingdom
Prior art keywords
lamp
housing
air
unit
inspection
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Withdrawn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
GB8002889A
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.)
OILFIELD INSPECTION SERVICES
Original Assignee
OILFIELD INSPECTION SERVICES
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 OILFIELD INSPECTION SERVICES filed Critical OILFIELD INSPECTION SERVICES
Priority to GB8002889A priority Critical patent/GB2068524A/en
Publication of GB2068524A publication Critical patent/GB2068524A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • F21V29/60—Cooling arrangements characterised by the use of a forced flow of gas, e.g. air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21L—LIGHTING DEVICES OR SYSTEMS THEREOF, BEING PORTABLE OR SPECIALLY ADAPTED FOR TRANSPORTATION
    • F21L14/00—Electric lighting devices without a self-contained power source, e.g. for mains connection
    • F21L14/02—Electric lighting devices without a self-contained power source, e.g. for mains connection capable of hand-held use, e.g. inspection lamps
    • 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
    • F21V25/00—Safety devices structurally associated with lighting devices
    • F21V25/10—Safety devices structurally associated with lighting devices coming into action when lighting device is overloaded, e.g. thermal switch
    • 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
    • F21V25/00—Safety devices structurally associated with lighting devices
    • F21V25/12—Flameproof or explosion-proof arrangements

Abstract

An inspection lamp comprises a housing 1 within which a lamp unit 2 is located and a front plate 5 incorporating an ultra-violet light transmitting filter 8. The housing is sealed with a handle having an inlet 12 for cooling air and an outlet 13 for exhaust air with coupling means for piping 14 supplying the air to the interior of the housing, a further connection means is provided for electric supply to the lamp and connection to a thermal overload switch 16. A control unit (not shown) has a pump for supply of filtered air and an electrical power supply, the unit being connected to the housing by conduits for air feed and return and a cable. <IMAGE>

Description

SPECIFICATION inspection lamp This invention relates to an inspection lamp for use in hazardous or difficult environments and in which the lamp is housed in a sealed casing. The lamp is primarily intended for ultra-violet inspection, for example in the detection of cracks in aircraft components.
According to this invention there is provided an inspection lamp comprising a housing within which a lamp unit is located and a front plate incorporating a light transmitting filter, the housing being sealed with an inlet for cooling air and an outlet for exhaust air with coupling means for piping supplying the air to the interior of the housing, a further connection means being provided for electric supply to the lamp.
With such an arrangement a lamp may be totally enclosed within the confined spaces of the housing and be adequately cooled by means of the air supply which, together with the electric supply, enters a housing through a handle portion integral therewith. Preferably a thermal cut-out means is provided within the housing serving to break the electric supply to the lamp when the temperature exceeds a predetermined value.
Associated with the lamp unit is a control box which may be provided at a location remote from the lamp and which is coupled thereto by means of flexible air lines and electric cable.
Preferably the lamp will be a mercury vapour filled ultra-violet emitting unit typically of one hundred watt rating and the filter will be an ultraviolet type.
The housing may be an integral one piece casting or moulding and the face plate is secured thereto using O-ring seals thereby forming an hermetically sealed unit. The air supply can be arranged to provide a positive pressure within the housing, thus assisting in preventing ingress of foreign matter or combustible gases or the like.
One construction of a lamp unit according to this invention is shown by way of example and described in conjunction with the accompanying drawings, wherein: Figure 1 shows a section through the lamp unit, Figure 2 shows a front view of the unit, Figure 3 illustrates the lamp unit and control unit, and Figure 4 shows one configuration of protective rubber on the lamp unit body.
Referring to Figures 1 and 2, the lamp unit comprises a housing 1 of integral construction containing a mercury filled lamp 2. A lamp holder 3 is provided with suitable electrical connecting means 4 and a face plate 5 is secured to the housing with a face seal formed by O-ring 6. The face plate 5 is secured by a number of screws arranged around the periphery indicated by 7 in Figure 2. The central portion of the face plate includes an ultra-violet filter 8 which is secured by means of a bezzle ring 9 contained by further screws 1 0.
The housing 1 also includes an integral shaped handle 11 which incorporates connecting means 12 for feed of cooling air and 13 for exhaust of cooling air. The air feed may be conducted to required places within the housing by means of an internal pipe or pipes 14. The handle also incorporates a gland connection 1 5 for electric supply to the lamp and also for connection to a thermal cut-out sensing device 1 6 located within the housing 1.
Referring to Figure 3, the lamp unit is connected to control unit 1 7 through the air lines 12 and 1 3 and electric cable connection 1 5. The control unit incorporates an air pump together with a pressure sensing means whereby any failure in air pressure is detected to switch off the electric supply. In addition the temperature sensor 1 6 is connected to the control unit so that power supply is disconnected when the temperature exceeds the pre-arranged value which typically will be 40cm. The control unit includes an air intake filter 19, pressure gauge 18 and air supply switch 20.
As shown in Figure 4, the housing 1 may be provided with rubber mouldings to protect the ends and one moulding 21 extends partly over the face plate and end of the housing with a further moulding 22 protecting the base.
The invention provides a lamp which is safe to use in potentially explosive areas and in which the lamp unit is cooled to ensure that the filter and external metal surfaces remain cool. The lamp is also sealed by means of the O-rings to ensure that vapour cannot ingress into the casing and this is assisted by the use of positive internal pressure through the cooling air. The control unit further provides protection to disconnect the electrical supply caused by loss of air pressure, overheating and also if any electrical leakage occurs, this latter function being effected through a leakage detector contained within the control unit.
1. An inspection lamp comprising a housing within which a lamp unit is located and a front plate incorporating a light transmitting filter, the housing being sealed with an inlet for cooling air and an outlet for exhaust air with coupling means for piping supplying the air to the interior of the housing, a further connection means being provided for electric supply to the lamp.
2. An inspection lamp in accordance with Claim 1, wherein the air inlet and outlet and electrical supply cables enter the housing through a handle integral therewith.
3. An inspection lamp in accordance with Claim 1 or 2, wherein the housing includes a thermal cut-out device to break the electric supply to the lamp when the temperature exceeds a predetermined value.
4. An inspection lamp in accordance with any preceding claim, wherein the lamp is an ultraviolet emitting type, the filter passing ultra-violet radiation.
5. An inspection lamp in accordance with any preceding claim, wherein the housing is an
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (10)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION inspection lamp This invention relates to an inspection lamp for use in hazardous or difficult environments and in which the lamp is housed in a sealed casing. The lamp is primarily intended for ultra-violet inspection, for example in the detection of cracks in aircraft components. According to this invention there is provided an inspection lamp comprising a housing within which a lamp unit is located and a front plate incorporating a light transmitting filter, the housing being sealed with an inlet for cooling air and an outlet for exhaust air with coupling means for piping supplying the air to the interior of the housing, a further connection means being provided for electric supply to the lamp. With such an arrangement a lamp may be totally enclosed within the confined spaces of the housing and be adequately cooled by means of the air supply which, together with the electric supply, enters a housing through a handle portion integral therewith. Preferably a thermal cut-out means is provided within the housing serving to break the electric supply to the lamp when the temperature exceeds a predetermined value. Associated with the lamp unit is a control box which may be provided at a location remote from the lamp and which is coupled thereto by means of flexible air lines and electric cable. Preferably the lamp will be a mercury vapour filled ultra-violet emitting unit typically of one hundred watt rating and the filter will be an ultraviolet type. The housing may be an integral one piece casting or moulding and the face plate is secured thereto using O-ring seals thereby forming an hermetically sealed unit. The air supply can be arranged to provide a positive pressure within the housing, thus assisting in preventing ingress of foreign matter or combustible gases or the like. One construction of a lamp unit according to this invention is shown by way of example and described in conjunction with the accompanying drawings, wherein: Figure 1 shows a section through the lamp unit, Figure 2 shows a front view of the unit, Figure 3 illustrates the lamp unit and control unit, and Figure 4 shows one configuration of protective rubber on the lamp unit body. Referring to Figures 1 and 2, the lamp unit comprises a housing 1 of integral construction containing a mercury filled lamp 2. A lamp holder 3 is provided with suitable electrical connecting means 4 and a face plate 5 is secured to the housing with a face seal formed by O-ring 6. The face plate 5 is secured by a number of screws arranged around the periphery indicated by 7 in Figure 2. The central portion of the face plate includes an ultra-violet filter 8 which is secured by means of a bezzle ring 9 contained by further screws 1 0. The housing 1 also includes an integral shaped handle 11 which incorporates connecting means 12 for feed of cooling air and 13 for exhaust of cooling air. The air feed may be conducted to required places within the housing by means of an internal pipe or pipes 14. The handle also incorporates a gland connection 1 5 for electric supply to the lamp and also for connection to a thermal cut-out sensing device 1 6 located within the housing 1. Referring to Figure 3, the lamp unit is connected to control unit 1 7 through the air lines 12 and 1 3 and electric cable connection 1 5. The control unit incorporates an air pump together with a pressure sensing means whereby any failure in air pressure is detected to switch off the electric supply. In addition the temperature sensor 1 6 is connected to the control unit so that power supply is disconnected when the temperature exceeds the pre-arranged value which typically will be 40cm. The control unit includes an air intake filter 19, pressure gauge 18 and air supply switch 20. As shown in Figure 4, the housing 1 may be provided with rubber mouldings to protect the ends and one moulding 21 extends partly over the face plate and end of the housing with a further moulding 22 protecting the base. The invention provides a lamp which is safe to use in potentially explosive areas and in which the lamp unit is cooled to ensure that the filter and external metal surfaces remain cool. The lamp is also sealed by means of the O-rings to ensure that vapour cannot ingress into the casing and this is assisted by the use of positive internal pressure through the cooling air. The control unit further provides protection to disconnect the electrical supply caused by loss of air pressure, overheating and also if any electrical leakage occurs, this latter function being effected through a leakage detector contained within the control unit. CLAIMS
1. An inspection lamp comprising a housing within which a lamp unit is located and a front plate incorporating a light transmitting filter, the housing being sealed with an inlet for cooling air and an outlet for exhaust air with coupling means for piping supplying the air to the interior of the housing, a further connection means being provided for electric supply to the lamp.
2. An inspection lamp in accordance with Claim 1, wherein the air inlet and outlet and electrical supply cables enter the housing through a handle integral therewith.
3. An inspection lamp in accordance with Claim 1 or 2, wherein the housing includes a thermal cut-out device to break the electric supply to the lamp when the temperature exceeds a predetermined value.
4. An inspection lamp in accordance with any preceding claim, wherein the lamp is an ultraviolet emitting type, the filter passing ultra-violet radiation.
5. An inspection lamp in accordance with any preceding claim, wherein the housing is an integral one piece casting or moulding and the face plate is secured thereto using O-ring seals thereby forming an hermetically sealed unit.
6. An inspection lamp according to any preceding claim in combination with a control unit connected therewith through air supply and return conduits and an electrical cable, the control unit including an air pump with air intake filter andxa power supply feeding the lamp through a cut-out coupled with a thermal sensing means in the lamp housing.
7. An inspection lamp in accordance with Claim 6, wherein the pump maintains a superatmospheric pressure in the lamp housing.
8. An inspection lamp according to any preceding claim, wherein annular rubber protective mouldings are provided around the periphery of the front plate and around a rear end of the housing.
9. An inspection lamp according to any preceding claim including air pressure sensing means serving to disconnect the electrical supply when the cooling air supply fails.
10. An inspection lamp according to any preceding claim, wherein the cooling air inlet connects with an internal pipe routing air to selected locations within the housing.
.11. An inspection lamp constructed and arranged to function as described in the specification and drawings.
GB8002889A 1980-01-29 1980-01-29 Inspection lamp with forced air cooling system Withdrawn GB2068524A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8002889A GB2068524A (en) 1980-01-29 1980-01-29 Inspection lamp with forced air cooling system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8002889A GB2068524A (en) 1980-01-29 1980-01-29 Inspection lamp with forced air cooling system

Publications (1)

Publication Number Publication Date
GB2068524A true GB2068524A (en) 1981-08-12

Family

ID=10510956

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8002889A Withdrawn GB2068524A (en) 1980-01-29 1980-01-29 Inspection lamp with forced air cooling system

Country Status (1)

Country Link
GB (1) GB2068524A (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0219588A1 (en) * 1984-05-24 1987-04-29 Penn-Med Tecnology, Inc. Cooled irradiating device
WO1992013433A1 (en) * 1991-01-29 1992-08-06 Charles Bernard Benson Light source for use in hazardous atmospheres
EP0743487A1 (en) * 1995-04-28 1996-11-20 Woodhead Industries, Inc. Air purged portable electric lamp
EP1517081A2 (en) * 2003-09-20 2005-03-23 Peter Broll CNC-Metalltechnik Luminaire for tunnels
EP2110900A1 (en) * 2008-04-17 2009-10-21 Vossloh-Schwabe Italia SPA Lampholder for an electrical appliance, in particular for a refrigerator, comprising thermal protection means
EP2133626A1 (en) * 2008-06-10 2009-12-16 Martin Professional A/S Cooling arrangement for a light source module.
CN101435554B (en) * 2008-06-10 2011-05-11 马田专业公司 Light source module for illumination equipment
US7954981B2 (en) 2008-06-10 2011-06-07 Martin Professional A/S Light source module for a light fixture
NL2006013C2 (en) * 2011-01-14 2012-07-17 Nedap Nv LIGHTING LIGHTS FOR LIGHTING ENVIRONMENTS THAT EXPLOSION HAZARD CAN EXIST.

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0219588A1 (en) * 1984-05-24 1987-04-29 Penn-Med Tecnology, Inc. Cooled irradiating device
WO1992013433A1 (en) * 1991-01-29 1992-08-06 Charles Bernard Benson Light source for use in hazardous atmospheres
EP0743487A1 (en) * 1995-04-28 1996-11-20 Woodhead Industries, Inc. Air purged portable electric lamp
EP1517081A2 (en) * 2003-09-20 2005-03-23 Peter Broll CNC-Metalltechnik Luminaire for tunnels
EP1517081A3 (en) * 2003-09-20 2007-12-12 Peter Broll CNC-Metalltechnik Luminaire for tunnels
EP2110900A1 (en) * 2008-04-17 2009-10-21 Vossloh-Schwabe Italia SPA Lampholder for an electrical appliance, in particular for a refrigerator, comprising thermal protection means
EP2133626A1 (en) * 2008-06-10 2009-12-16 Martin Professional A/S Cooling arrangement for a light source module.
CN101435554B (en) * 2008-06-10 2011-05-11 马田专业公司 Light source module for illumination equipment
US7954981B2 (en) 2008-06-10 2011-06-07 Martin Professional A/S Light source module for a light fixture
NL2006013C2 (en) * 2011-01-14 2012-07-17 Nedap Nv LIGHTING LIGHTS FOR LIGHTING ENVIRONMENTS THAT EXPLOSION HAZARD CAN EXIST.
WO2012105828A1 (en) * 2011-01-14 2012-08-09 N.V. Nederlandsche Apparatenfabriek Nedap Lighting armature for lighting environments where explosion hazard may exist

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)