RU2066809C1 - Lighting box with discharge lamp - Google Patents

Abstract

FIELD: lighting engineering. SUBSTANCE: lighting box has discharge lamp, transparent shell, butts and protective shell manufactured as glass tube. Jacket of elastic transparent film isolating lamp and its content from outer space in case of mechanical damage to tube or loss of sealing is applied on internal and external sides of tube. Lighting box can be assembled quickly and provides for multiple usage of protective shell when lamp is replaced. There are provided makes expanding operational capabilities of box thanks to application of light reflecting coat on part of tube under transparent elastic film which ensures specified emittance angle of lamp, Light controlling frame with ribs distance between which satisfies condition

Description

 The invention relates to lighting engineering, in particular, to luminaires with tubular discharge lamps, with environmentally hazardous filling, for example, mercury and other components.

 Known designs of luminaires, for example, with fluorescent lamps, in which, according to environmental, fire and general safety conditions, operation requires the protection of a fragile thin-walled glass bulb. To this end, the lamp is placed in an additional, mechanically stronger translucent sheath. As a rule, these are translucent tubes made of light-stabilized thermoplastics, for example, polycarbonate, polymethyl methacrylate or silicate glass.

 In addition to protecting from the harmful effects of the environment in the entire luminaire, the protective tube protects the lamp from possible mechanical damage and thereby reduces the likelihood of environmentally hazardous lamp contents, for example, mercury, phosphor dust entering the environment of the illuminated room.

 Known methods for improving environmental safety, for example, mercury-containing lamps, by applying a translucent elastic film to the outer shell of the lamp. If there is such a coating, in case of breaking the lamps, individual pieces of it are held by the film, while reducing the likelihood of hazardous components filling the lamp into the room.

An example of such a solution are fluorescent lamps with a transparent elastic coating based on Surlin polymer powder from Du Pott Co, manufactured by Shot-r-Shield [1,2]
According to the goals described solutions are close to the proposed invention by the author. However, all of them have significant disadvantages. The pressure of the filling gas (vapor) inside the bulb of both a working and a non-working lamp is significantly (2-3 orders of magnitude) lower than the external atmospheric pressure acting on the bulb of the lamp from the outside. The consequence of the large pressure difference inside and outside the lamp is the explosive nature of the destruction of the bulb when it is mechanically damaged, which sharply reduces the protective functions of the film and increases the likelihood of mercury, phosphor dust and other harmful components contained inside the lamp coming out. The protective film is located only on the outside of the lamp, which is most susceptible to possible damage (peeling, punctures, etc.), which in principle does not exclude its depressurization.

 Given the above, in practice, to achieve this goal, protective tubes made of thermoplastic translucent materials (polycarbonate, polymethylmethacrylate) or silicate glass are widely used.

 The closest to the patented technical solution are the protective blocks for fluorescent lamps used in compacted luminaires by ZumtobeL [3] in which the external protective tube is made of polycarbonate (luminaires of the KRSP type) or of silicate glass (luminaires of the KSR type). When mounted in a lamp, the lamp is inserted inside the tube, sealing elements (threaded rings, cuffs, sealing gaskets) are put on the outside of the tube. Then the lamp with the strung elements is inserted by pins into the lamp holders one by one, after which the protective tube is fixed and sealed in the end parts in the lamp holders. An example of such a solution is also the LSP18 domestic-made luminaires [4] in which, in contrast to the ZumtobeL luminaires, the protective tube is made of polymethyl methacrylate, which increases the fire hazard and thereby limits the scope of domestic luminaires. However, all known solutions have inherent disadvantages. Mechanical damage to the tubes leads to a complete depressurization of the lamp cavity. The use of self-extinguishing materials such as polycarbonate as a material for a protective tube is very expensive, the use of cheap but combustible, for example, polymethylmethacrylate, necessitates an increase in the diameter and, therefore, material consumption of the tube. The low heat resistance of the material and its combustibility introduce additional restrictions on the applicability of luminaires in a number of rooms, for example, in fire hazardous rooms. The use of large diameter tubes for acceptable thermal parameters requires a corresponding increase in size, and therefore the material consumption of reflectors and lampholders. In some cases, this drawback is eliminated by the use of so-called reflex fluorescent lamps (domestic LBR lamps). However, the introduction of an additional reflective layer inside the lamp leads to a sharp increase in the complexity of the lamp manufacturing, since all materials introduced into the lamp must be of a high degree of purity and subjected to appropriate treatment in the lamp composition, ensuring normal lamp operation, excluding internal “poisoning” of the phosphor, cathodes, and deterioration the composition of the working filling of such a lamp. Such lamps did not receive mass distribution, since the reflective layer, sharply increasing the technological cost of the lamp, is thrown out together with the spent lamp, which dramatically increases the operating costs of the lamp. Another disadvantage is that the sealing systems of lamp holders with protective tubes, given their mechanical independence from the protective tube, are very complicated and material-intensive compared to lamp holders without protective tubes. Protective tubes do not carry any lighting load, which increases the cost of lamps with tubes relative to other types of lamps.

 The aim of the invention is to increase the overall safety during operation of fragile tubular discharge lamps, their environmental safety when harmful substances hazardous to health and the environment are used in the construction of lamps, while improving operating conditions, reducing material consumption, laboriousness and expanding the operational capabilities of products.

 In FIG. 1-12 shows the lighting box and its options.

 The protective box of FIG. 1.2 consists of a glass tube 1, on which a translucent elastic film 2 of slow-burning (non-combustible) material is applied from the inner and outer sides. Thus, the glass tube is completely inside the translucent elastic protective cover. On both sides of the tube are inserted collets 3 with grooves 4, thread 5 and petals 6 with an inner cone, working for expansion. From the ends, threaded plugs 7 and 8 are screwed into the collets. The plug 7 has a groove or two holes 9 on the end part with a diameter and an axial distance equal to the corresponding dimensions of the lamp base pins and the axial distance between them. On the opposite side of the tube, a threaded plug 8 is screwed, which, in contrast to the plug 7, has a central hole 10 equal to or greater than the diameter of the lamp tube. The threaded plugs 7 and 8 with their end parts abut against the conical parts of the petals 6 of the collets 3, expand them to a tight (tightened) stop in the inner surface of the tube and thereby reliably hold onto it.

 A lamp is inserted inside the tube through the central hole 10 of the plug 8, which is inserted with its pins 11 into the corresponding holes 9 of the screw plug 7. From the end of the opposite side, a thrust cap 12 is screwed onto the screw plug with a central hole smaller than the diameter of the lamp base but larger than the diameter of the circumference described around the lamp pins. The lamp through the end part of the cap is pressed by the bottom 13 of the cover 12 to the bottom of the opposite threaded plug 7. The assembled box is installed in the lamp as a whole. The holes of the threaded plug 7 do not allow the lamp to rotate relative to the protective tube when the box is rotated during installation in the lamp holders.

 To expand the lighting capabilities of the box on a part of the inner or outer surfaces of the protective tube before applying the elastic film, an additional reflective layer (reflector) 14 can be applied with a given radiation exit angle α (Figs. 3-5). The elastic film provides mechanical protection for the reflective layer and the stability of reflective properties throughout the life of the tube.

где b расстояние между ребрами;
а высота ребра каркаса;
a нормируемый защитный угол.With increased requirements for mechanical protection, a reinforcing frame 15 (Fig. 6) is applied to the surface of the protective tube, covering the tube externally under a transparent elastic film (Fig. 7) or poured with it in a single unit (Fig. 8.9). The frame can be made with ribs (6,10,11,12), perform the function of protecting from the blinding action of the lamp and can be both light-scattering and reflective, while the distance between the ribs of the frame in each particular section satisfies the requirement

where b is the distance between the ribs;
and the height of the rib frame;
a rated protective angle.

Claims (5)

 1. Lighting box with a discharge lamp, consisting of a tubular lamp having insufficient mechanical strength under operating conditions and containing environmentally hazardous components, a translucent protective sheath and end faces, characterized in that the protective sheath is made in the form of a glass tube, which is sealed with an external and the inner side is covered with a cover made of an elastic ultra-transparent film that insulates the lamp and its contents from the outer space when the glass tube is mechanically damaged or depressurized zatsii lamps.  2. Boxing according to claim 1, characterized in that the ends are made collapsible in the form of threaded collets working for expansion, the collets are made with cone-shaped petals from the inner and cylindrical shapes on the outside, threaded plugs are screwed on both sides of the tube in one collet, of these, an end wall is provided with a groove intended for passage of the lamp pins and fixing it relative to the tube, the second threaded plug is made with a through hole along the diameter of the lamp and with an external threaded end onto which a thrust cover is screwed with with an end wall in which a central hole is provided, the diameter of the hole is larger than the diameter of the circumscribed circle around the lamp pins, but smaller than the base diameter, the thrust cover is installed so that its inner end part abuts the end of the lamp base, tightly pressing the opposite end of the second base to the end of the screw plug so that it forms a one-piece quick-disconnect sealed system for the lamp, in which the lamp is separated from the external environment.  3. Boxing according to claim 1 or 2, characterized in that on the outer surface of the tube under a translucent elastic film or together with it, a reinforcing frame of light-transmitting or reflecting material is applied as a whole. 4. Boxing according to claim 3, characterized in that the frame is made with ribs, the distance between which satisfies the condition

where b is the distance between the edges of the frame in the considered section;
a the height of the ribs of the frame in the same section;
a rated protective angle.  5. Boxing according to claim 1, characterized in that on the inner and / or outer surface of the tube a reflective layer with a predetermined radiation exit angle is applied under a layer of transparent elastic film.

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