JPH08124541A - Explosion-proof double wall tube - Google Patents

Abstract

PURPOSE: To provide a safe explosion-proof double wall tube capable of alleviating a shock, upon the rapture of an inner bulb, for the prevention of an outer bulb fracture by winding an explosion-proof spring around the external surface of the light emitting section of the inner bulb. CONSTITUTION: This explosion-proof double wall tube is formed out of an outer bulb 6 with one end closed and the other end fitted with a base 11 capable of being inserted in a receptacle generally used at home, and a single-ended inner bulb 1 with one end closed and the other end sealed. Also, the inner bulb 1 is housed in the outer bulb 6, while the closed ends of the bulbs 1 and 6 being oriented in the same direction. In addition, an explosion-proof spring 7 is wound around the outer surface of the light emitting section 2b of the inner bulb 1. In this case, the explosion-proof spring 7 can be wound around the outer surface of the upper end area, intermediate area, lower area or the whole area of the section 2b of the bulb 1, thereby selectively protecting a section liable to undergo the most serious damage due to the rapture of the inner bulb 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an explosion-proof double tube in which an inner valve is reinforced with an explosion-proof spring.

[0002]

2. Description of the Related Art Halogen light bulbs are superior in luminous efficiency to conventional incandescent light bulbs by 25 to 30% or more.
Since the pressure inside the envelope can be made higher than conventional incandescent bulbs,
It is well known that it has a long life.

However, as compared with the conventional incandescent light bulb, the halogen light bulb has a very small envelope size of, for example, 2 cc, and therefore, when the filament sometimes deteriorates and hangs down and comes into contact with the envelope. If the envelope bursts due to a sudden local overheating of the envelope and the glass fragments scatter around with a burst sound, or if the filament breaks and an arc discharge occurs at the broken part, the internal enclosed gas rapidly There is a problem that the glass expands and the envelope bursts, and glass fragments scatter with a burst noise.

On the other hand, the conventional incandescent light bulb is 150 cc in size, which is much larger than the halogen light bulb, and the internal pressure during lighting is not so different from the atmospheric pressure. Even if there is no rupture of the envelope even at times, there is no chance of making a plosive sound,
In addition, there is no rupture due to arc discharge during filament cutting. Therefore, it is necessary to solve the problem of rupture in order to adopt a halogen bulb having many advantages as compared with the conventional incandescent bulb as a substitute for the conventional incandescent bulb.

Further, the halogen bulb is smaller in size than the conventional incandescent bulb as described above, and the base used is usually E1.
There is a problem in use that one type is used and cannot be screwed into an outlet (E27 or E26 type) of a general household as it is.

[0006]

The problems to be solved by the present invention are as follows.
To make halogen bulbs a substitute for conventional incandescent bulbs so that they can be used in ordinary households without any discomfort, use the same shape as conventional incandescent bulbs, and take safety measures against explosion of halogen bulbs. Is mentioned.

[0007]

According to a first aspect of the present invention, an outer valve (6) having one end closed and the other end fitted with a base (11) which can be screwed into a general household socket. )When,
It consists of a single-ended inner valve (1) with one end closed and the other end sealed, with the closed end of the inner valve (1) and the closed end of the outer valve (6) facing in the same direction. In the explosion-proof double tube (A) in which the outer bulb (6) is housed, the explosion-proof spring (7) is wound around the light emitting part (2b) of the inner valve (1).

During long-term use, the filament (3) deteriorates and hangs down to come into contact with the envelope (2) of the inner valve (1) and its contact portion is rapidly overheated to cause the envelope ( When 2) bursts or the filament (3) is broken and an arc discharge occurs at the broken part, the enclosed gas in the envelope (2) explodes thermally and causes the envelope (2) to burst. Or the pinch seal part
(2a) and residual strain due to insufficient annealing around it and residual strain due to insufficient annealing around the tip tube (16) or its periphery are promoted by turning on / off the halogen bulb used as the inner bulb (1), and finally pinch. Seal part (2
There is a possibility that a crack will occur in a) or the tip tube (16) or its surrounding area, causing a burst.

In this case, the light emitting part (2
Since the explosion-proof spring (7) is wrapped around the outer periphery of b) in a suitable place or the whole, the explosion-proof spring (7) buffers the rupture of the light emitting part (2b) and alleviates the damage of the outer bulb (6). become.

Here, the explosion-proof spring (7) is attached to the inner valve (1).
Wrap around the upper end of the light emitting part (2b) of the
Is wound around the center outer circumference of the light emitting part (2b) of the inner bulb (1), the explosion-proof spring (7) is wound around the lower outer circumference of the light emitting part (2b) of the inner valve (1), or the explosion-proof spring (7 ) Is loosely wound around the entire circumference of the light emitting part (2b) of the inner bulb (1), so that the part most susceptible to damage due to rupture can be selectively protected.

Further, by using a base (11) that can be screwed into a general household socket as a base (11) of the outer bulb (6), a halogen light bulb can be used for home as a substitute for a conventional incandescent light bulb. You can In addition to this, when the outer bulb (6) is made to have almost the same shape as a conventional incandescent light bulb, the consumer does not feel uncomfortable in use and the explosion-proof light bulb (A) according to the present invention is used as a household incandescent light bulb. Can be blended in as an alternative.

[0012]

EXAMPLE An explosion-proof light bulb (A) according to the present invention will be described below in detail with reference to the illustrated embodiments. The explosion-proof light bulb of the present invention (A),
It is mainly composed of an inner valve (1), an outer valve (6) and a base (11). A halogen bulb is used as the inner bulb (1) in this embodiment, but other types of bulbs can be used as the inner bulb (1). Lead rods (4) and (5) are erected inside the envelope (2) from the pinch seal portion (2a) of the inner valve (1), and a filament (3) is erected at the tip thereof. The enclosure (2) contains various filling gases such as xenon gas or krypton gas, and the filling pressure is 3 to 8 atm, preferably 7 to 8 atm. As a result, compared with the conventional incandescent light bulb, the life can be remarkably extended and the luminous flux can be remarkably increased as compared with the low-pressure halogen light bulb. Incidentally, the filling pressure of a general halogen bulb is 3 to 4 atmospheres, and when it is 4 atmospheres or more, it has a longer life and higher luminous efficiency than conventional halogen bulbs.

Further, H ₂ O in the inner valve (1),
In order to remove the O ₂ and OH groups, prevent the so-called water cycle, reduce the occurrence of sag in the filament (3), and prolong the life of the halogen bulb (1), tantalum, nickel, aluminum are added as necessary. Getters such as may be included.

For the envelope (2) of the inner valve (1), hard glass, quartz glass, or the like is selected according to its application. In this embodiment, hard glass is used for cost reduction. When the envelope (2) is hard glass, the expansion coefficient is almost equal to that of the molybdenum lead rods (4) and (5),
The lead rods (4) and (5) can be directly inserted into the pinch seal portion (2a) of the halogen bulb (1) without using molybdenum metal foil. If the envelope (2) is quartz glass, although not shown, molybdenum metal foil is embedded in the pinch seal portion, and the inner lead rod and the outer lead rod are connected via the molybdenum metal foil, The external lead rod is led out from the pinch seal portion (2a).

The outer bulb (6) has a shape similar to or close to that of a conventional incandescent light bulb, and the volume thereof is not limited to this, but is usually about 150 to 140 cc. The material of the outer bulb (6) is also not particularly limited, but quartz glass, hard glass, soda glass, etc. are used. In terms of cost, hard glass and soda glass are suitable.

Reference numeral (8) is a ceramic support, which is adhered to the open end of the outer bulb (6), and a halogen bulb is attached to a mounting portion (8a) formed at the tip of the ceramic support (8).
The pinch seal part (2a) of (1) is fixed by an adhesive (15). A pair of relay cords (9) and (10) are welded to the pair of lead rods (4) and (5) derived from the pinch seal part (2a), and one of the relay leads (9) is connected to the outer valve (9). The base end (6) is soldered to the base (11), and another relay lead (10) is soldered to the eyelet (13) provided at the center of the base (11). An insulator (12) is arranged at the inner lower end of the base (11) to electrically separate the eyelet (13) and the base (11).

The base (11) of the outer bulb (6) is E26, E27 or the like used in a conventional incandescent lamp, and has a shape that can be screwed into a conventional outlet. The base (11) is adhered to the open end of the outer bulb (6) with an adhesive (14), and the halogen bulb (1) is fixed so as to be located in the inner center of the outer bulb (6). Of course, it is also possible to use a bayonet type base.

A relay cord forming a part of the energizing path
(10) A fuse (18) is installed in the middle of "or (9)", and if a voltage higher than the withstand voltage is applied to the filament (3), the disconnection of the filament (3) will occur, as will be described later. Previously, the fuse (18) was blown, essentially preventing the halogen bulb (1) from bursting.

The explosion-proof spring (7) is formed by winding a thin wire of molybdenum, for example, and is wound around the upper end of the light emitting portion (2b) of the inner bulb (1) as shown in FIG. As shown in Fig. 4, the inner bulb (1) is wound around the center of the light emitting part (2b), or as shown in Fig. 4, the inner bulb is
Wrap around the lower part of the light emitting part (2b) of (1), or
Connect the explosion-proof spring (7) to the light-emitting part (2
By sparsely wrapping around the entire circumference of b), the part most susceptible to damage due to rupture is selectively protected. Corresponds to the rupture of the envelope (2) due to residual strain due to insufficient annealing of the tip tube (16) or its surroundings.
Corresponding to rupture of the filament (3) due to sag, is to cope with residual strain due to insufficient annealing of the pinch seal portion (2a) and its periphery. This selectively protects the part most likely to be damaged by the burst. The explosion-proof spring (7) may be loosely wrapped around the entire circumference of the light-emitting part (2b) of the inner bulb (1) as shown in the figure. However, the luminous efficiency will be slightly reduced. Also,
As shown in FIG. 1, the other end of the explosion-proof spring (7) spirally wound may be brought into contact with the inner surface of the closed end of the outer valve (6) to fix the head of the inner valve (1). .

When the base (11) of the explosion-proof light bulb (A) constructed as described above is screwed into a household outlet and the switch is turned on, the filament (3) lights up. Halogen bulbs (1)
Is superior to an incandescent light bulb in efficiency of 25 to 30% or more (the higher the internal pressure, the longer the life and the luminous efficiency). Therefore, for example, an incandescent light bulb of 60 W has an output of 42 W or more. Halogen bulb (1) is equivalent. Thereby, energy saving can be achieved.

The pressure inside the envelope (2) of the halogen bulb (1) is very high, as described above, at 3 to 8 atm, preferably 7 to 8 atm (in the envelope of the conventional incandescent bulb). Pressure is 0.8
It is about atmospheric pressure. ), Therefore evaporation of the filament (3) during the halogen cycle can be suppressed and life is averaged to 2
It can be extended more than twice.

During long-term use, the filament (3) sometimes deteriorates and hangs down as described above, and comes in close proximity to or in contact with the envelope (2). When the envelope (2) bursts due to sudden overheating of the contact / proximity part, or residual strain due to insufficient annealing of the pinch seal part (2a), the tip tube (16) and its vicinity, the halogen bulb (1) Lights up
It is promoted by turning off the light, pinch seal part (2a) and tip tube
(16) and its surroundings have cracks and envelope (2)
If the filament breaks, or if the filament (3) breaks, an arc discharge will occur at the broken part, and the enclosed gas in the envelope (2) will rapidly expand thermally and cause the envelope (2) to burst. is there. In this case, the existence of the explosion-proof spring (7) alleviates the explosion and the fragments do not collide with the outer valve (6) at a high speed, and the outer valve (6) can be prevented from being damaged.

Here, the pinch seal portion (2a) and the tip tube (1
6) If the envelope (2) of the halogen bulb (1) bursts due to residual strain due to insufficient annealing in 6) and its vicinity,
Since the crack or explosion occurs before the pressure of the enclosed gas in the envelope (2) becomes too large, the explosive force is relatively small, but it may cause chain rupture of the outer valve (6), The explosion-proof spring (7) is attached to the light emitting part to ensure safety.
It is preferably provided above or below (2b).

Add the fuse (1) to the relay cord (10) “or (9)”.
Briefly explaining the operation in the case of providing the (8), arc discharge due to the disconnection of the filament (3) occurs in the envelope (2), and if this continues, the arc discharge in the envelope (2) The gas is expanded thermally, and the gas pressure reaches several tens of atmospheric pressure, and reaches near the pressure resistance of the envelope (2). As mentioned above, the tip tube is not
There are weak points having distortion such as (16) and the pinch seal part (2a). Therefore, it cannot withstand the increase in gas pressure due to the expansion gas, and the envelope (2) will burst, but when the filament (3) evaporates and disappears, arc discharge occurs at that part, and the resistance value Becomes almost zero, and a large current flows in the envelope (2) of the halogen bulb (1). This large current is a fuse
As it flows through the (18), the fuse (18) is blown and the current is cut off before the gas pressure in the envelope (2) rises above the withstand pressure as described above. In this way, the fuse (18) can prevent the envelope (2) from rupturing due to continuous arc discharge.

However, since the fusing of the fuse (18) is a physical phenomenon rather than an electrical phenomenon, it takes a little time. Therefore, before the fuse (18) is blown, the halogen bulb
The explosion-proof spring (7) must be installed regardless of the presence of the fuse (18), because the (1) may burst.

[0026]

According to the present invention, since the explosion-proof spring is wound around the outer circumference of the light emitting portion of the inner bulb, the shock when the inner bulb is ruptured can be alleviated. Therefore, it is possible to prevent damage to the outer bulb, and even when using a halogen bulb as an inner bulb, the halogen bulb can be safely used in ordinary households as a substitute for conventional incandescent bulbs.
Further, since a cap that can be screwed into a socket for general household use is installed as a base of the outer bulb, it can be used in a general household without any discomfort as a substitute for a conventional incandescent light bulb.

[Brief description of drawings]

FIG. 1 is a sectional view of a first embodiment of a halogen light bulb according to the present invention.

FIG. 2 is a sectional view of a second embodiment of the halogen light bulb according to the present invention.

FIG. 3 is a sectional view of a third embodiment of the halogen bulb according to the present invention.

FIG. 4 is a sectional view of a halogen light bulb according to a fourth embodiment of the present invention.

FIG. 5 is a sectional view of a halogen light bulb according to a fifth embodiment of the present invention.

[Explanation of symbols]

 (1)… Single-ended inner bulb (2)… Enclosure (2b)… Light emitting part (6)… Outer bulb (7)… Explosion-proof spring (11)… Base

Claims (6)

[Claims] 1. An outer valve having one end closed and a base that can be screwed into a household socket at the other end, and a single-ended inner valve having one end closed and the other end sealed. In the explosion-proof double tube in which the inner valve closed end and the outer valve closed end face in the same direction and the inner valve is housed inside the outer valve, the explosion-proof spring is wound around the outer periphery of the light emitting part of the inner valve. Explosion-proof double tube. 2. The explosion-proof double tube according to claim 1, wherein an explosion-proof spring is wound around the upper end periphery of the light emitting portion of the inner bulb. 3. The explosion-proof double tube according to claim 1, wherein an explosion-proof spring is wound around the center outer circumference of the light emitting portion of the inner bulb. 4. The explosion-proof double tube according to claim 1, wherein an explosion-proof spring is wound around the outer periphery of the lower portion of the light emitting portion of the inner bulb. 5. The explosion-proof double tube according to claim 1, wherein an explosion-proof spring is loosely wound around the entire circumference of the light emitting portion of the inner bulb. 6. The explosion-proof double pipe according to claim 1, wherein the end of the explosion-proof spring is arranged at the closed end of the outer valve.