CN2569337Y - Safety type single end halogen tungsten lamp - Google Patents

Abstract

The utility model relates to a safety type single-end halogen tungsten lamp. The utility model is provided with a bulb shell (7), a glass bead (4), a support lever (5), a filament (6) and electrode outlets (3), (8), wherein, molybdenum sheets (2), (10) are inserted into a sealing end of the bulb shell, and the two molybdenum sheets are respectively and electrically connected with lamp feet (1), (11) outside the bulb shell; after extending out of the glass bead, the lower end of one electrode outlet (3) is electrically connected with the molybdenum sheet (2). The utility model is characterized in that the lower end of the other electrode outlet (8) which is inserted into the glass bead is electrically connected with the molybdenum sheet (10) through a fuse wire (9). The fuse wire of the utility model is arranged in the bulb shell, which plays the function of preventing the bulb shell from exploding, and the fuse wire does not need to be in external connection when the utility model is used.

Description

Safety Single-Ended Tungsten Halogen Lamp

technical field

The utility model belongs to a single-end halogen tungsten lamp.

Background technique

The main structure of the existing 8-250V, 20-250W single-ended halogen tungsten lamp is shown in Figure 1: the glass beads (4) in the bulb are embedded with support rods (5) and electrode lead wires (3), (8), both ends of the filament (6) are hung on the upper end of the electrode lead wire, the middle part is supported by the upper end of the support rod, the lower ends of the two electrode lead wires are electrically connected to the molybdenum sheet (2) embedded in the sealing end of the bulb, and the molybdenum sheet is connected to the outside of the bulb The lamp pin (1) is electrically connected. The two electrode lead wires (3), (8) have three main functions: 1. The lower part supports the glass bead; 2. The upper part supports the filament; 3. The overall function is to electrically connect the filament to the lamp pin. Function, in order to ensure sufficient support strength for the glass beads, usually its diameter should not be too small, about φ0.20-0.50mm, and the diameter of the electrode lead wire is the same above the glass beads and below the glass beads; when When the filament of this type of single-ended tungsten-halogen lamp is blown out, it is very easy to generate arc discharge between the two electrode lead-out wires. When the diameter of the electrode lead-out wire is φ0.20mm, the arc discharge current can reach 5A, which consumes the bulb. The power of the bulb reaches 400-1100W in an instant, far exceeding the power of the bulb when it is working normally. The pressure in the bulb rises sharply, causing the bulb to explode. Tungsten-halogen lamps must be connected with a suitable fuse when in use to ensure that the current is cut off in a short time when a discharge occurs in the bulb to prevent the bulb from exploding. This has just brought inconvenience to actual use.

Contents of the invention

The technical problem to be solved by the utility model is to provide a safe single-ended halogen tungsten lamp that can cut off the current from the inside of the bulb in time to prevent the bulb from exploding when a discharge occurs in the bulb.

The technical scheme that solves the above problem is (seeing embodiment Fig. 2,3): the utility model is provided with bulb (7), is provided with glass bead (4) in the bulb, and support bar (5) and The electrode leads (3), (8), the two ends of the filament (6) are hung on the top of the electrode lead, the middle part is supported by the support rod, the bulb sealing end is embedded with molybdenum sheets (2), (10), two molybdenum sheets They are respectively electrically connected to the lamp pins (1) and (11) outside the bulb shell, and the lower end of one of the electrode lead wires (3) extends out of the glass bead, and is electrically connected to the molybdenum sheet (2) embedded in the sealing end of the bulb shell , characterized in that: the lower end of another electrode lead wire (8) embedded in glass beads is electrically connected to the molybdenum sheet (10) embedded in the sealing end of the bulb through a fuse (9).

The fuse of the utility model is arranged inside the bulb. When a discharge occurs between the two electrode lead-out wires on the upper part of the glass bead, the fuse connected in series between the lower end of an electrode lead-out wire and the molybdenum sheet will quickly fuse and cut off the fuse. current, to prevent the bulb from exploding, and there is no need to connect an external fuse in actual use.

Description of drawings

Figure 1. Schematic diagram of the structure of the existing single-ended tungsten-halogen lamp

Fig. 2, the structure schematic diagram of embodiment 1 of the utility model

Fig. 3, the structural schematic diagram of embodiment 2 of the utility model

1-Lamp foot 2-Molybdenum sheet 3-Electrode lead wire 4-Glass beads 5-Support rod 6-Filament filament 7-Bulb shell

8-Electrode lead wire 9-Fuse 10-Molybdenum sheet 11-Lamp foot

specific implementation plan

Example 1 (Figure 2)

This example is a 50W single-ended halogen tungsten lamp. The halogen gas filled in the bulb is 60% Kr, 40% N2, and the cold pressure is 2.5atm. The lead wire 3 is a molybdenum wire of φ0.27mm, the three support rods 5 are molybdenum wires of φ0.24mm, the glass bead 4 is a cylinder of φ3mm, and the bulb 7 is a quartz tube with an upper diameter of φ13mm and a wall thickness of 1.1mm.

In this example, the electrode lead wire 8 located above the glass bead and embedded in the glass bead is composed of molybdenum wire and a helical tungsten wire wound on it. The lower end of the tungsten wire is connected as a whole, and the lower end is welded with the molybdenum sheet 10 to form a helical tungsten wire. The diameter of the molybdenum wire forming the electrode lead-out wire 8 is φ0.2mm, the diameter of the spiral tungsten wire is φ0.036mm, and the diameter of the tungsten wire forming the spiral fuse 9 is φ0.036mm. The production method of this example is: the raw material of the electrode lead-out wire 8 and the fuse 9 is to use the whole molybdenum wire wound with a helical tungsten wire, and remove the molybdenum wire core of the lower section by chemical method, that is, form a connected electrode lead-out wire. wire 8 and a spiral fuse 9 electrically connected to the electrode lead-out wire.

The normal operating current of the filament 6 in this example is 0.22A, and the rated maximum melting current of the spiral fuse 9 is about 0.44A, which does not affect the normal operation of the filament, and limits the discharge current to within 1A. 1. An arc discharge is generated between the lead wires of the two electrodes, and when the current reaches above 0.44A, the fuse 9 will be blown rapidly, and the discharge is terminated to prevent the bulb from exploding.

Because a section of the original electrode lead-out wire 8 used to support the glass bead 4 is connected in series with a fuse with a smaller diameter, which weakens the effect of supporting the glass bead, so the utility model appropriately increases the diameter of the other electrode lead-out wire 3 Large to ensure sufficient support for the glass beads. The spiral fuse 9 can have greater strength and is not easy to be broken by shock.

Embodiment 2 (Fig. 3)

The fuse 9 in this example is a metal wire whose diameter is smaller than the electrode lead wire 3 , its upper end is welded to the electrode lead wire 8 , and its lower end is welded to the molybdenum sheet 10 .

Claims (3)

1. Safety type single-ended halogen tungsten lamp, equipped with a bulb (7), with a glass bead (4) inside the bulb, and a support rod (5) and electrode lead wires (3), (8) embedded in the glass bead , the two ends of the filament (6) are hung on the top of the lead-out wire of the electrode, the middle part is supported by the support rod, the sealing end of the bulb is embedded with molybdenum sheets (2), (10), and the two molybdenum sheets are respectively connected to the lamp pins (1) outside the bulb ), (11) electrical connection, after the lower end of one of the electrode lead wires (3) extends out of the glass bead, it is electrically connected with the molybdenum sheet (2) embedded in the sealing end of the bulb, and is characterized in that: the other embedded glass bead The lower end of the electrode lead wire (8) is electrically connected to the molybdenum sheet (10) embedded in the sealing end of the bulb via a fuse (9). 2. The safety type single-ended tungsten halogen lamp according to claim 1, characterized in that: the electrode lead wire (8) is composed of molybdenum wire and a spiral tungsten wire wound on it, and the glass bead below The fuse (9) is made up of the helical tungsten wire whose upper end is connected with the helical tungsten wire on the electrode lead-out wire (8), and whose lower end is welded with the molybdenum sheet (10). 3. The safe single-ended tungsten halogen lamp according to claim 1, characterized in that: said fuse (9) is a metal wire with a diameter smaller than that of the electrode lead wire (3), and its upper end is connected to the electrode lead wire (8) Welding connection, the lower end is welded to the molybdenum sheet (10).

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