CA1205508A - Controlled contact conduction cooling for low pressure vapour lamp - Google Patents
Controlled contact conduction cooling for low pressure vapour lampInfo
- Publication number
- CA1205508A CA1205508A CA000415483A CA415483A CA1205508A CA 1205508 A CA1205508 A CA 1205508A CA 000415483 A CA000415483 A CA 000415483A CA 415483 A CA415483 A CA 415483A CA 1205508 A CA1205508 A CA 1205508A
- Authority
- CA
- Canada
- Prior art keywords
- tube
- discharge tube
- low pressure
- flat discharge
- encompassing
- 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
Links
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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/70—Lamps with low-pressure unconstricted discharge having a cold pressure < 400 Torr
Abstract
ABSTRACT OF THE DISCLOSURE
In order to provide high intensity radiation the discharge tube of a low pressure vapour lamp is mounted within an encasing tube so as to make contact with the inside wall of the encompassing tube. In use the encompassing tube is immersed in a medium to be irradiated, which cools the flat discharge tube as a result of the wall contact.
In order to provide high intensity radiation the discharge tube of a low pressure vapour lamp is mounted within an encasing tube so as to make contact with the inside wall of the encompassing tube. In use the encompassing tube is immersed in a medium to be irradiated, which cools the flat discharge tube as a result of the wall contact.
Description
~OS~;~8 The present invention relates to a low pressure vapour lamp particularly a mercury low pressure vapour lamp having a lamp tube designed as a flat discharge tube encom-passed by an encasing tube.
Such low pressure vapour lamps usually consist of a quartz tube filled with metal vapour having a vapour pres--sure of, e.g., 0.1 torr and two electrodes at the ends. The lamp tube has an oblong flat cross section. The term "flat discharge tube" is used for this reason.
In operation a light emitting arc discharge is creat-ed between the elecirodes. Mercury low pressure lamps are most widely used, since they are very suitable devices for producing UV radiation. In fact, the light emitted by them is a pure line sp~ctrum having a high proportion of UV radia-tion with particularly strong lines at 254 nm.
Carrying out photochemical reactions with the aid of UV radiation has been increasingly gaining in importance recently, and photochemical disinfecting and sterilizing pro-; cesses constitute a particularly important field. A number of these reactions and primarily also the disinfecting andsterilizing processes show a marked dependence on the radia-tion intensity, so that a radiation intensity and power as high as possible are important. That is due to the fact that the correspondin~ reactions require a simultaneous presence of a specific minimum number of photons (for example, 4 or 5) at the location of the moiecule to be reacted and therefore cannot proceed when radiation of lower intensity is employed which cannot supply simultaneously this minimum number of photons. This situation cannot be improved, for example, by extending the time of irradiation.
The flat discharge tube is customarily encompassed ~y an encompassing tube consisting of quartz. The assembly ~2(~;5~
consisting of the encompassing tube and flat discharge tube can then be immersed in water for sterilization. In contrast to the oblong flat cross section of the flat discharge tube the encompassing tube is a circular tube, since optimal pro-tection against the surrounding water pressure can thus be provided. The flat discharge tube in the encompassing tube can be constructed with relatively ~hin walls.
The flat discharge tube produces, in addition to the 254 nm line mentioned above, a line, which is not so intensive, i.e., at 183 nm, so that ozone, which supports the disinfecting and sterilizing process, can be produced.
However, even today the fact that the radiation intensity required for effective disinfection and steriliza-tion cannot be attained directly confronts the ever increasing importance of conventional low pressure vapour lamps. An increased radiation intensity by means of an increased energy supply can only be attained by simultaneously providing ade-quate cooling of the low pressure lamp. In fact, a reasonably erfective cooling with a resulting increase of radiation in-tensity is known from German Offenlegungsschrift 2,825,018.
This cooling is attained by providing special cooling tubes along the narrow sides of the discharge tube, but this is a`
case of separate cooling requiring additional expenditure at the discharge tube. Attempts have also been made to concen-trate the radiation of several lamps into the same reaction volume with the aid of reflectors. However, this also is costly and results in a poor energy e~uilibrium.
It is an aim of the present invention to provide a low pressure vapour lamp in which an increase of the radiation intensity can be attained by simple means while avoiding the disadvantages described hereinbefore.
According to the present invention there is provide~
~!L ZaOS5~
a low pressure vapour lamp, comprising a flat discharge tube mounted with in anencompassing tube having an inside wall so as to be capable of being brought at least partially into con-tact with the inside wall of said encompassing tube.
The invention is based on the surprising fact that by bringing the flatdischarge tube into contact with the encom-passing tube, cooling can be provided by the medium which en-compasses the encompassing tube and is to be disinfected and sterilized. Tests have shown that a substantial increase in radiation intensity can be attained by this so-called contact cooling. This is all the more surprising since both the en-compassing tube and the jacket of the flat discharge tube are made of quartz, i.e., a poor heat conductor. The gas in the flat discharge tube cools at the points of contact of the flat discharge tube with the encompassing tube to such an extent that a higher supply of energy and thus a higher emitted radi-ation intensity are attained.
Particularly favourable values can be attained with a low pressure vapour lamp according to the present invention when the medium surrounding the encompassing tube, usually water, does not exceed a maximum temperature of 25 C.
By the simple measure of bringing the flat discharge tube into contact with the encompassing tube the separate 1, S~oc~s cooling required by conventional arrangements can be dis~e~3 ed with In fact the desired increase of the radiation in-tensity can also be attained by separate cooling, but this would involve a substantial expenditure for additional parts and thus increased costs, while in the case of the proposed cooling by contact, merely contact of the discharge tube with the encompassing tube is required.
In a preferred embodiment of the present invention the contact is so designed that it is linear in the direction ~L2~
of the longitudinal axes of both the flat discharge tube and the encompassing tube so that one contact line exits along the surface of the flat discharge tube. However, in many cases this kind of linear contact with the encompassing tube cannot always be realized for production-related reasons, since both the inside wall of the encompassing tube and the outside wall of the flat discharge tube might be slightly uneven. In this case the contact is limited to a plurality of discrete points of contact. However, corresponding tests gave the surprising result that adequate cooling by contact is attained even in such cases, so costly separate cooling can be dispens-ed with.
Another way of achieving cooling by contact is to provide t'ne flat discharge tube with several sleeves disposed around the outside wall and brought into contact with the en-compassing tube.
In order to avoid possible damage to the low pres-sure lamp during transportation, another embodiment provides a flat discharge tube disposed within the encompassing tube so as to be slidable at right angles to its longitudinal axis and fi~able in various positions. In one of its posi-tions, i.e., in the transportation position, the flat discharge tube is disposed centrally within the encompassing tube so that contact with the encompassing tube is avoided. After transportation, and, when putting the flat dischar~e tube into operation, it is then shifted into the other position and fixed so that it makes the desirèd contact with the encompass-ing tube.
The novel cooling-by-contact provided by the present invention can be so effective that under certain conditions, when switching the low pressure vapour lamp on, the optimal operating temperature of the gas in the flat discharge tube ~2(~1~9~118 is not reached. In anotner suitable embodiment the cooling by contact comes into effect only when a specific temperature is reached. For this purpose a bimetal strip can be used. On reach-ing a predetermined temperature value said bimetal strip causes the flat discharge tube to shift into a position in which it is in contact with the encompassing tube.
The invention will now be described in more detail, by way of example only, with reference to the accompanying drawings, in which:-Figure 1 and 2 show a diagrammatic cross sectional view, taken along the line A-B in Figure 3, of a low pressure, vapour lamp according to one embodiment of the present inven-tion, illustrating two different positions of a flat discharge tube within an encompassing tube;
Figure 3 shows a part cross sectional view of a reactor containing several low pressure vapour lamps; and Figure 4 is a diagrammatic representation of a flat discharge tube with sleeves disposed on the outer jacket.
The low pressure lamp 1 shown in the drawing com-prises a flat discharge tube 2 having an oblong flat crosssection. The flat discharge tube 2, whose outer wall consists of quartz, is encompassed in the usual manner by a circular encompassing tube 4, also made of quartz.
Externally a reaction space 28 (see Fig. 3) adjoins the encompassing tube. This reaction space receives the medium, for example, water, to be subjected to UV radiation for the purpose of disinfection and sterilization. In Figure 3 a total of four encompassing tubes 4 with flat discharge tubes 2 disposed therein are provided. The encompassing tubes 3a 4 are disposed at an angle of 90 with respect to each other. Only two of the encompassing tubes can be seen in the cross sectional drawing. Approximately at the centre of the reaction space 28 5 ~
-~2OSg~i~B
there is disposed a sensor 1~ for the UV radiation at this point.
The reactor 30 has a cover 32 and a casing 40. The encompassing tubes 4 are retained within a flange 34, which communicates with a shroud ring 36 via a screw connection 38.
Gaskets 24 and 26 are provided for sealing the reaction space 28.
As is further evident from Figure 3 and 4 each flat discharge tube 2 has on its outer ends a socket 20 with elec-trodes 22 for the flat discharge tube 2. (Only one end of the falt discharge tubes 2 is shown in the Eigures so that only one socket 20 can be seen in each case).
The flat discharge tubes 2 within the encompassing tubes 4 are retained by a disc-shaped discharge tube support 10 disposed at the two ends of the encompassing tube 4. Via the electrodes 22, which engage corresponding orifices of the discharge tube support 10, the flat discharge tube 2 com-municates with the two discharge tube supports 10 at their outer ends~
As is evident from the drawings in Figure 1 and 2 the discharge tube supports 10, and thus of course also the flat discharge tubes 2 communicating therewith, are slidable in a direction indicated by the arrow 12 both towards the left and towards the right. The sliding direction is prefer-ably chosen at right angles to the direction in which the flat discharge tube 2 with its oblong cross section extends.
Each ~ischarge tube support 10 is provided with two oblong holes 14 extending in the direction o~ the arrow 12.
A pin 16 engages each oblong hole 14 whereby a well-defined guide is obtained during the shifting of the discharge tube supports 10. Furthermore because of the pins 16, which are fixed with respect to the discharge tube supports 10, differ-~;~atS5~
ent end positions of the discharge tube supports 10 are mark-ed when the pins 16 are at one end of the oblong hole or at the other. The discharge tuhe supports 10 can be fixed in the two end positions by means of screws (not shown) so that the flat discharge tube is also fixed in the two different positions.
According to Figure 1 the discharge tube supports 10 are in a first fixed position, to which a central arrange-ment of the flat discharge tube 2 within the tube 4 has been assigned. In this position of the flat discharge tube 2 (the only position used heretofore~ it can also be transported without difficulty, since the flat discharge tube 2 is not in contact with the encompassing tube 4.
By shifting the discharge tube supports 10 in the direction of the arrow 12 the position shown in Figure 2 is attained. Since the flat discharge tube 2 moves together with the discharge tube supports 10 while the encompassing tube 4 and the pins 16 retain their positions. The flat dis-charge tube 2 comes into contact with the inside wall of the encompassing tube 4 at the points of contact 6 and 8. In the ideal case the two contact points extend in a line along the entire length of the flat discharge tube 2.
Taking into account the diameters of the pins 16, the length of the oblong holes 14 is so chosen that, starting from the position in Figure 1, when shifting the discharge tube supports 10 in the direction of the arrow 12, the flat discharge tube 2 comes into contact with the encompassing tube 4 without any damage.
In the embodirnent shown in Figure 4 (the encompass-ing tube is not shown in this case) the flat discharge tube 2is surrounded by sleeves 42, which are spaced apart. In this case, too, the flat discharge tube 2 can be shifted by means ~ss~
of the discharge tube supports 10 to such an extent that the sleeves 42 rest against the inside wall of the encompass-ing tube 4, whereby the desired cooling by contact is also obtained.
In the Figures 1 and Z it has been assumed that the discharge tube supports 10 are shifted by hand. It is of course also possible to use mechanical means for this purpose.
The use of a bimetal strip which has the property of mechani-cal deformation on exceeding a specific temperature, is particularly favourable. When this kind of bimetal strip is util-ized for shifting the discharge tube supports 10 and the flat discharge tube 2 until contact with the encompassing tube 4 is made, the advantage is attained that the cooling by contact does not start immediately on starting the low pres-sure vapour lamp 1. The low pressure vapour lamp 1 can then reach its optimum operating temperature without cooling and the cooling by contact is produced only thereafter with the aid of a bimetal strip.
Such low pressure vapour lamps usually consist of a quartz tube filled with metal vapour having a vapour pres--sure of, e.g., 0.1 torr and two electrodes at the ends. The lamp tube has an oblong flat cross section. The term "flat discharge tube" is used for this reason.
In operation a light emitting arc discharge is creat-ed between the elecirodes. Mercury low pressure lamps are most widely used, since they are very suitable devices for producing UV radiation. In fact, the light emitted by them is a pure line sp~ctrum having a high proportion of UV radia-tion with particularly strong lines at 254 nm.
Carrying out photochemical reactions with the aid of UV radiation has been increasingly gaining in importance recently, and photochemical disinfecting and sterilizing pro-; cesses constitute a particularly important field. A number of these reactions and primarily also the disinfecting andsterilizing processes show a marked dependence on the radia-tion intensity, so that a radiation intensity and power as high as possible are important. That is due to the fact that the correspondin~ reactions require a simultaneous presence of a specific minimum number of photons (for example, 4 or 5) at the location of the moiecule to be reacted and therefore cannot proceed when radiation of lower intensity is employed which cannot supply simultaneously this minimum number of photons. This situation cannot be improved, for example, by extending the time of irradiation.
The flat discharge tube is customarily encompassed ~y an encompassing tube consisting of quartz. The assembly ~2(~;5~
consisting of the encompassing tube and flat discharge tube can then be immersed in water for sterilization. In contrast to the oblong flat cross section of the flat discharge tube the encompassing tube is a circular tube, since optimal pro-tection against the surrounding water pressure can thus be provided. The flat discharge tube in the encompassing tube can be constructed with relatively ~hin walls.
The flat discharge tube produces, in addition to the 254 nm line mentioned above, a line, which is not so intensive, i.e., at 183 nm, so that ozone, which supports the disinfecting and sterilizing process, can be produced.
However, even today the fact that the radiation intensity required for effective disinfection and steriliza-tion cannot be attained directly confronts the ever increasing importance of conventional low pressure vapour lamps. An increased radiation intensity by means of an increased energy supply can only be attained by simultaneously providing ade-quate cooling of the low pressure lamp. In fact, a reasonably erfective cooling with a resulting increase of radiation in-tensity is known from German Offenlegungsschrift 2,825,018.
This cooling is attained by providing special cooling tubes along the narrow sides of the discharge tube, but this is a`
case of separate cooling requiring additional expenditure at the discharge tube. Attempts have also been made to concen-trate the radiation of several lamps into the same reaction volume with the aid of reflectors. However, this also is costly and results in a poor energy e~uilibrium.
It is an aim of the present invention to provide a low pressure vapour lamp in which an increase of the radiation intensity can be attained by simple means while avoiding the disadvantages described hereinbefore.
According to the present invention there is provide~
~!L ZaOS5~
a low pressure vapour lamp, comprising a flat discharge tube mounted with in anencompassing tube having an inside wall so as to be capable of being brought at least partially into con-tact with the inside wall of said encompassing tube.
The invention is based on the surprising fact that by bringing the flatdischarge tube into contact with the encom-passing tube, cooling can be provided by the medium which en-compasses the encompassing tube and is to be disinfected and sterilized. Tests have shown that a substantial increase in radiation intensity can be attained by this so-called contact cooling. This is all the more surprising since both the en-compassing tube and the jacket of the flat discharge tube are made of quartz, i.e., a poor heat conductor. The gas in the flat discharge tube cools at the points of contact of the flat discharge tube with the encompassing tube to such an extent that a higher supply of energy and thus a higher emitted radi-ation intensity are attained.
Particularly favourable values can be attained with a low pressure vapour lamp according to the present invention when the medium surrounding the encompassing tube, usually water, does not exceed a maximum temperature of 25 C.
By the simple measure of bringing the flat discharge tube into contact with the encompassing tube the separate 1, S~oc~s cooling required by conventional arrangements can be dis~e~3 ed with In fact the desired increase of the radiation in-tensity can also be attained by separate cooling, but this would involve a substantial expenditure for additional parts and thus increased costs, while in the case of the proposed cooling by contact, merely contact of the discharge tube with the encompassing tube is required.
In a preferred embodiment of the present invention the contact is so designed that it is linear in the direction ~L2~
of the longitudinal axes of both the flat discharge tube and the encompassing tube so that one contact line exits along the surface of the flat discharge tube. However, in many cases this kind of linear contact with the encompassing tube cannot always be realized for production-related reasons, since both the inside wall of the encompassing tube and the outside wall of the flat discharge tube might be slightly uneven. In this case the contact is limited to a plurality of discrete points of contact. However, corresponding tests gave the surprising result that adequate cooling by contact is attained even in such cases, so costly separate cooling can be dispens-ed with.
Another way of achieving cooling by contact is to provide t'ne flat discharge tube with several sleeves disposed around the outside wall and brought into contact with the en-compassing tube.
In order to avoid possible damage to the low pres-sure lamp during transportation, another embodiment provides a flat discharge tube disposed within the encompassing tube so as to be slidable at right angles to its longitudinal axis and fi~able in various positions. In one of its posi-tions, i.e., in the transportation position, the flat discharge tube is disposed centrally within the encompassing tube so that contact with the encompassing tube is avoided. After transportation, and, when putting the flat dischar~e tube into operation, it is then shifted into the other position and fixed so that it makes the desirèd contact with the encompass-ing tube.
The novel cooling-by-contact provided by the present invention can be so effective that under certain conditions, when switching the low pressure vapour lamp on, the optimal operating temperature of the gas in the flat discharge tube ~2(~1~9~118 is not reached. In anotner suitable embodiment the cooling by contact comes into effect only when a specific temperature is reached. For this purpose a bimetal strip can be used. On reach-ing a predetermined temperature value said bimetal strip causes the flat discharge tube to shift into a position in which it is in contact with the encompassing tube.
The invention will now be described in more detail, by way of example only, with reference to the accompanying drawings, in which:-Figure 1 and 2 show a diagrammatic cross sectional view, taken along the line A-B in Figure 3, of a low pressure, vapour lamp according to one embodiment of the present inven-tion, illustrating two different positions of a flat discharge tube within an encompassing tube;
Figure 3 shows a part cross sectional view of a reactor containing several low pressure vapour lamps; and Figure 4 is a diagrammatic representation of a flat discharge tube with sleeves disposed on the outer jacket.
The low pressure lamp 1 shown in the drawing com-prises a flat discharge tube 2 having an oblong flat crosssection. The flat discharge tube 2, whose outer wall consists of quartz, is encompassed in the usual manner by a circular encompassing tube 4, also made of quartz.
Externally a reaction space 28 (see Fig. 3) adjoins the encompassing tube. This reaction space receives the medium, for example, water, to be subjected to UV radiation for the purpose of disinfection and sterilization. In Figure 3 a total of four encompassing tubes 4 with flat discharge tubes 2 disposed therein are provided. The encompassing tubes 3a 4 are disposed at an angle of 90 with respect to each other. Only two of the encompassing tubes can be seen in the cross sectional drawing. Approximately at the centre of the reaction space 28 5 ~
-~2OSg~i~B
there is disposed a sensor 1~ for the UV radiation at this point.
The reactor 30 has a cover 32 and a casing 40. The encompassing tubes 4 are retained within a flange 34, which communicates with a shroud ring 36 via a screw connection 38.
Gaskets 24 and 26 are provided for sealing the reaction space 28.
As is further evident from Figure 3 and 4 each flat discharge tube 2 has on its outer ends a socket 20 with elec-trodes 22 for the flat discharge tube 2. (Only one end of the falt discharge tubes 2 is shown in the Eigures so that only one socket 20 can be seen in each case).
The flat discharge tubes 2 within the encompassing tubes 4 are retained by a disc-shaped discharge tube support 10 disposed at the two ends of the encompassing tube 4. Via the electrodes 22, which engage corresponding orifices of the discharge tube support 10, the flat discharge tube 2 com-municates with the two discharge tube supports 10 at their outer ends~
As is evident from the drawings in Figure 1 and 2 the discharge tube supports 10, and thus of course also the flat discharge tubes 2 communicating therewith, are slidable in a direction indicated by the arrow 12 both towards the left and towards the right. The sliding direction is prefer-ably chosen at right angles to the direction in which the flat discharge tube 2 with its oblong cross section extends.
Each ~ischarge tube support 10 is provided with two oblong holes 14 extending in the direction o~ the arrow 12.
A pin 16 engages each oblong hole 14 whereby a well-defined guide is obtained during the shifting of the discharge tube supports 10. Furthermore because of the pins 16, which are fixed with respect to the discharge tube supports 10, differ-~;~atS5~
ent end positions of the discharge tube supports 10 are mark-ed when the pins 16 are at one end of the oblong hole or at the other. The discharge tuhe supports 10 can be fixed in the two end positions by means of screws (not shown) so that the flat discharge tube is also fixed in the two different positions.
According to Figure 1 the discharge tube supports 10 are in a first fixed position, to which a central arrange-ment of the flat discharge tube 2 within the tube 4 has been assigned. In this position of the flat discharge tube 2 (the only position used heretofore~ it can also be transported without difficulty, since the flat discharge tube 2 is not in contact with the encompassing tube 4.
By shifting the discharge tube supports 10 in the direction of the arrow 12 the position shown in Figure 2 is attained. Since the flat discharge tube 2 moves together with the discharge tube supports 10 while the encompassing tube 4 and the pins 16 retain their positions. The flat dis-charge tube 2 comes into contact with the inside wall of the encompassing tube 4 at the points of contact 6 and 8. In the ideal case the two contact points extend in a line along the entire length of the flat discharge tube 2.
Taking into account the diameters of the pins 16, the length of the oblong holes 14 is so chosen that, starting from the position in Figure 1, when shifting the discharge tube supports 10 in the direction of the arrow 12, the flat discharge tube 2 comes into contact with the encompassing tube 4 without any damage.
In the embodirnent shown in Figure 4 (the encompass-ing tube is not shown in this case) the flat discharge tube 2is surrounded by sleeves 42, which are spaced apart. In this case, too, the flat discharge tube 2 can be shifted by means ~ss~
of the discharge tube supports 10 to such an extent that the sleeves 42 rest against the inside wall of the encompass-ing tube 4, whereby the desired cooling by contact is also obtained.
In the Figures 1 and Z it has been assumed that the discharge tube supports 10 are shifted by hand. It is of course also possible to use mechanical means for this purpose.
The use of a bimetal strip which has the property of mechani-cal deformation on exceeding a specific temperature, is particularly favourable. When this kind of bimetal strip is util-ized for shifting the discharge tube supports 10 and the flat discharge tube 2 until contact with the encompassing tube 4 is made, the advantage is attained that the cooling by contact does not start immediately on starting the low pres-sure vapour lamp 1. The low pressure vapour lamp 1 can then reach its optimum operating temperature without cooling and the cooling by contact is produced only thereafter with the aid of a bimetal strip.
Claims (9)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A low pressure vapour lamp, comprising a flat discharge tube mounted within an encompassing tube having an inside wall so as to be capable of being brought into contact with the inside wall of said encompassing tube.
2. A low pressure vapour lamp according to claim 1, wherein said contact is linear along longitudinal axes of both the flat discharge tube and the encompassing tube.
3. A low pressure vapour lamp according to claim 1, wherein the flat discharge tube makes contact with the inside wall of the encompassing tube along two lines extending along longitudinal axes of the flat discharge tube and the encom-passing tube.
4. A low pressure vapour lamp according to claim 1, in which the flat discharge tube includes a plurality of sleeves of heat-conducting material at intervals there along, said flat discharge tube making contact with the inside wall of the encompassing tube through said sleeves.
5. A low pressure vapour lamp according to claim 1, wherein the flat discharge tube is slidable at right angles to its longitudinal axis in the encompassing tube so as to allow the discharge tube to be moved away from the wall of the encom-passing tube during transportation.
6. A low pressure vapour lamp according to claim 5, wherein the flat discharge tube can be fixed in various selec-ted positions.
7. A low pressure vapour lamp according to claim 5, wherein the flat discharge tube is mounted at opposed ends on a support which is slideable at right angles to the longitudinal axis of the flat discharge tube.
8. A low pressure vapour lamp according to claim 7, wherein said support is provided with oblong holes at respective opposite ends, and two fixed pins engage said re-spective oblong holes to define two different end positions of the slidable support.
9. A low pressure vapour lamp according to any of claims 5 to 7, further comprising a bimetal strip arranged, when a predetermined temperature value is reached, to cause the flat discharge tube to shift into a contact position with the encompassing tube.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP3144925.5 | 1981-11-12 | ||
| DE19813144925 DE3144925A1 (en) | 1981-11-12 | 1981-11-12 | LOW-PRESSURE STEAM LAMP |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1205508A true CA1205508A (en) | 1986-06-03 |
Family
ID=6146215
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000415483A Expired CA1205508A (en) | 1981-11-12 | 1982-11-12 | Controlled contact conduction cooling for low pressure vapour lamp |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0079849B1 (en) |
| AT (1) | ATE26769T1 (en) |
| CA (1) | CA1205508A (en) |
| DE (2) | DE3144925A1 (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4071799A (en) * | 1977-04-01 | 1978-01-31 | Xerox Corporation | Sodium vapor lamp with emission aperture |
| DE2825018C2 (en) * | 1978-06-05 | 1986-07-24 | Georg 4902 Bad Salzuflen Horstmann | Mercury vapor low pressure lamp |
| JPS5853150A (en) * | 1981-09-25 | 1983-03-29 | Toshiba Electric Equip Corp | Ultraviolet-ray radiating device |
-
1981
- 1981-11-12 DE DE19813144925 patent/DE3144925A1/en not_active Withdrawn
-
1982
- 1982-11-10 DE DE8282730134T patent/DE3276144D1/en not_active Expired
- 1982-11-10 EP EP82730134A patent/EP0079849B1/en not_active Expired
- 1982-11-10 AT AT82730134T patent/ATE26769T1/en not_active IP Right Cessation
- 1982-11-12 CA CA000415483A patent/CA1205508A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| EP0079849B1 (en) | 1987-04-22 |
| DE3144925A1 (en) | 1983-06-16 |
| EP0079849A3 (en) | 1984-04-25 |
| EP0079849A2 (en) | 1983-05-25 |
| ATE26769T1 (en) | 1987-05-15 |
| DE3276144D1 (en) | 1987-05-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |