JP2003045623A - Lamp and heating device/heating system using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent cracking of quartz glass due to volume expansion caused by oxidation of molybdenum foil by moisture infiltrating into melt-sealed sections and the fall and scattering outward of quartz glass pieces separated due to cracking. SOLUTION: The both ends of the quartz glass tube including melt-sealed sections are covered tight by pipes made of a heat-resistant and elastic material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lamp in which a heating element is sealed in a quartz glass tube, and more particularly to a lamp with improved reliability at both ends of the quartz glass tube and heating / heating using the lamp. Regarding the device.

[0002]

2. Description of the Related Art As a conventional heat source for heating, there are a heater type and a lamp type in which a heating element is inserted in a heat resistant glass tube. As the heater type, there is a nichrome wire heater in which a heating element obtained by winding a nichrome wire into a coil is placed in an opaque quartz glass tube. In addition, as the lamp type, a filament wound with a coil of tungsten wire is inserted into a quartz glass tube, and a quartz glass tube is sealed with an inert gas inside, or a gas containing a small amount of a halogen compound gas in the inert gas. There is a sealed halogen lamp, or a carbon lamp in which a sintered body of a carbon-based material is used as a heating element, internal lead wires are attached to both ends thereof, and a quartz glass tube is hermetically sealed and an inert gas is put therein.

The conventional lamp type has the following problems. The structure of the fusion-sealed parts at both ends of the quartz glass tube of the conventional lamp-type heating heat source will be described with reference to the perspective view of FIG. Incidentally, FIG. 5 showing a conventional example shows a fusion sealing portion at one end of a lamp-type heating heater, and a heating element portion inside the quartz glass tube 1 and a fusion sealing portion at the other end. Are not shown.

In FIG. 5, the melt-sealing portion 2 at the end of the quartz glass tube 1 has an internal molybdenum wire or tungsten wire connected to the end of a heating element (not shown) because it is inside the quartz glass tube 1. The ends of the lead wires 11 are led out. The ends of the inner lead wires 11 are welded to one end of the molybdenum foil 12. An outer lead wire 13 formed of another molybdenum wire is welded to the other end of the molybdenum foil 12. The end of the quartz glass tube 1 is heated and melted to be flat, and a molybdenum foil 12 is sealed on the end. In addition, argon or nitrogen gas is sealed inside the quartz glass tube 1 in order to prevent oxidation of the contained heating element.

A lead wire 4 for supplying a current to the lamp is joined to the external lead wire 13, and a protective tube 3 made of glass fiber covered with a silicone resin is provided at the joint portion for insulation and protection from the surroundings. Has been inserted into. Further, the outside of the quartz glass tube is fixed to a mounting case 7 for mounting the lamp to an external device such as a heating device by a band-shaped press fitting 8. Further, the mounting case 7 is provided with a claw portion 41 for fixing the outer side of the protective tube 3.

[0006]

Under the present circumstances, the fused sealing portion of the quartz glass tube of the above-mentioned conventional lamp is used while having a big problem that there is a high risk of breakage during use. The mechanism of damage to the fusion-sealed portion will be described with reference to FIG. 6, which is an enlarged cross-sectional view of the sealed portion at one end of the quartz glass tube. In FIG. 6, the inner lead wire 11 and the outer lead wire 13 are welded and joined to the molybdenum foil 12, respectively, and the ends of the quartz glass tube 1 are heated and melted to be sealed in the melt sealing portion 2. In this conventional structure, it is only the molybdenum foil 12 that blocks the flow of gas between the inside and the outside of the quartz glass tube 1 in the fusion sealing part 2. That is, from a microscopic point of view, the joint interface between the surface of the inner lead wire 11 and the outer lead wire 13 and the fused and sealed quartz glass tube 1 is not completely sealed and has a gap through which air and water vapor can pass. It has been confirmed.

Under this condition, the lamp is
When left in a particularly humid environment, water vapor gradually penetrates through the gap at the interface A between the external lead wire 13 and the fused silica glass and reaches the end B of the external lead wire 13 welded to the molybdenum foil 12. . As a result, the end B of the external lead wire 13 and the portion of the molybdenum foil 12 in contact with the end B are oxidized. When the oxidation progresses and the volume of the oxidized portion increases, and the quartz glass expands beyond the breaking limit force, cracks occur at that portion. Originally, molybdenum foil and molybdenum material for external lead wires have a larger coefficient of thermal expansion than quartz glass material, so if the lamp is turned on when water enters and is oxidized, destruction will accelerate when the melted seal is heated. It

When a crack is formed and it gradually expands,
Finally, it reaches the gap C (FIG. 5) between the inner lead wire 11 and the fused quartz glass which is in contact therewith, and water vapor penetrates into the inside of the quartz glass tube 1 from the cracks and the heating element oxidizes and breaks. However, the type of failure of the heater lamp is not limited to this, and the quartz glass piece in the crack portion may peel off and fall, resulting in injury if a person steps on it. It has been desired to solve the above problems.

The present invention reduces the risk of breakage of the fused and sealed portion of the quartz glass tube during use, and even when the breakage occurs, it is possible to prevent the occurrence of injuries due to the peeled glass, and reliability and reliability of the lamp. It is an object of the present invention to provide a device for improving safety and heating or heating.

[0010]

The lamp of the present invention comprises an internal lead wire having one end connected to an end of a heating element, a molybdenum foil having one end welded to the other end of the internal lead wire, and the other molybdenum foil. A heating element structure having an external lead wire welded to the end (heating element assembly), the heating element structure is inserted, filled with an inert gas, and the both ends of the molybdenum foil are melted and sealed. A lamp having a quartz glass tube, characterized in that the melt-sealed portions at both ends of the quartz glass tube are covered with heat-resistant elastic members.

In the structure of the present invention, the fused sealing portion of the quartz glass tube is covered with the heat resistant elastic member. Therefore, since the fusion-sealed portion is not exposed to the outside, it is possible to suppress the intrusion of water vapor from the interface between the external lead wire and the quartz glass. As a result, it is possible to suppress oxidation of the heating element due to water vapor that has entered the inside of the quartz glass tube, reduce disconnection, and improve reliability. In addition, even if the quartz glass in the fusion-sealed portion is cracked and damaged, the glass pieces generated by the damage and separation are confined in the heat-resistant elastic member. Therefore, it does not fall and scatter outside the lamp. As a result, it is possible to improve the safety without the human being injured by the falling glass fragments.

In the lamp having the above structure, it is preferable that the heat-resistant elastic member is formed of a material in which glass fiber is impregnated with silicon varnish. Since the material for covering the sealing portion is glass fiber having high heat resistance and impregnated with silicone varnish, which has heat resistance and elasticity, it has flexibility and can protect the sealing portion in a close contact state. Further, since this material does not change thermally even if it is heated by the heat of the melt-sealed portion of the quartz glass tube, it has been experimentally proved that the material protects the melt-sealed portion for a long period of time. Further, it is preferable that one end of the pipe-shaped heat-resistant elastic member is externally attached to the melt-sealed portion of the quartz glass tube in a close contact state, and the other end is pressed. At this other end, an inner diameter of the pipe having heat resistance and elasticity is made slightly smaller than the outer diameter of the melt-sealed portion, and the other end is press-contacted with a quartz glass tube with a close contact body to insert the pipe. There is no gap in the insertion portion of the pipe-shaped heat-resistant elastic member, and even if a piece of quartz glass peels off, it does not scatter to the outside.

Further, one end of the heat-resistant elastic member in the form of a pipe is externally attached to the fused sealing portion of the quartz glass tube in a close contact state, and the other end is pressure-welded, and at least one of the heat-resistant elastic members. It is preferable that the portion is fixed by a fitting or a mounting case. The heat-resistant elastic member is fixed by using a fixture for mounting the lamp to an external device, and the opening portion of the pipe is sealed, so that the quartz glass using the conventional fixture is used. It is possible to realize a lamp that prevents scattering of peeled pieces. Furthermore, it is preferable that the heat-resistant elastic member is formed of a metal plate or the like that is a lamp mounting case. In this case, the material is a metal plate, and the structure can also serve as a metal fitting for fixing the quartz glass tube of the lamp to an external device, so that the lamp can be compactly mounted.

The heating / heating device of the present invention is characterized in that the lamp having the above-mentioned configuration is used as a heat source for heating. It is possible to provide a compact and safe inexpensive heating device or heating device by improving the safety of the fusion-sealed portion of the lamp.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION A preferred embodiment of a lamp of the present invention will be described below with reference to the accompanying drawings with respect to a protective structure of a melt-sealed portion which is a characteristic part thereof.

<< Embodiment 1 >> FIG. 1 is an enlarged partial perspective view showing one end of a lamp according to Embodiment 1 of the present invention, and FIG. 2 is an exploded perspective view showing the structure of the end of FIG. is there.
1 and 2, the end portion of the internal lead wire 11 from the heating element (not shown), which is inside the quartz glass tube 1, is led out from the end of the quartz glass tube 1. The ends of the inner lead wires 11 are welded to one end of the molybdenum foil 12. The other end of the molybdenum foil 12 is welded to one end of another external lead wire 13 made of a molybdenum wire or a tungsten wire. As shown in FIG. 2, the other end of the external lead wire 13 is welded and connected to a lead wire 4 covered with an insulating protection tube 15 for connecting to an external device at a joint portion 14. Besides welding, caulking connections can be used as well. Protective tube 3 is external lead wire 1
3 for insulating and protecting the connection between the lead wire 4 and the lead wire 3 and the lead wire 4, and preferably a tube in which the surface of a silicone resin is covered with glass fiber is used.

The melt-sealing portion 2 is press-fitted and inserted as shown in FIG. 1 in a state of closely adhering to a protective pipe 5 which is a heat-resistant insulating member having elasticity, and the other end of the protective pipe 5 is a protective tube 3. It is pressed and deformed by being strongly pressed so as to be in close contact with, and is preferably fixed by, for example, a pin 6 of a stapler.
The quartz glass tube 1 is fixed by a pressing plate 8 to a fixture 7 for fixing the lamp to an external device. Further, a pair of claws 9 for lightly holding and fixing the lead wire 4 on the outer side of the protective tube 3 are attached to the fixture 7.

A protective pipe 5 covering the fusion-sealed portion 2
As the heat-resistant insulating member constituting the above, in addition to the above-mentioned silicone resin whose surface is coated with glass fiber, a sheet or pipe woven with glass fiber is impregnated with silicone varnish, or a silicone resin or a fluorine-based resin is used. A tape, a pipe, a heat shrink pipe made of a silicone resin or a fluorine resin, or the like can be applied. Also, other materials can be used in the same manner as long as they are materials having heat resistance and insulation properties. Further, the same effect can be obtained by winding a tape-like member made of the same material instead of the protective pipe 5.

According to the lamp of the first embodiment, the fused sealing portion 2 of the quartz glass tube 1 is wrapped by pressing the elastic protective pipe 5 strongly and deforming it. Therefore, the melt-sealed portion 2 is not exposed to the outside and water vapor or the like is prevented from entering the melt-sealed portion 2 from the outside. Further, even if the quartz glass of the fusion sealing portion 2 is cracked and broken by the invading water vapor, since the glass piece is confined in the protective pipe 5, it will not be scattered to the outside. Therefore, it is possible to realize a safe lamp that does not damage the human body or the like by the glass pieces. Further, the protection structure of the lamp sealing portion of the first embodiment is not limited to the heating element to be used, but can be applied to all lamps of the type in which the heating element is sealed using the quartz glass tube.

<Embodiment 2> FIG. 3 is a partial perspective view showing one end of a lamp according to Embodiment 2 of the present invention. The lamp of the second embodiment differs from that of the first embodiment only in the structure of the fixture body 22. Therefore, the same parts as those in the first embodiment are designated by the same reference numerals and the duplicated description will be omitted. In FIG. 3, the lamp fixture of the second embodiment is composed of a fixture main body 22 made of metal and a pressing metal fitting 21. The attachment body 22 has two claws 23 and 24 for fixing the pressing member 21, two claws 25 and 26 for fixing the protective pipe 5 to the outer side of the protective tube 3 so as to be fixed thereto, and the protective tube 3. Claw 2 for fixing
Have 7. The pressing metal fitting 21 has a pressing piece 28 formed by cutting and raising the protective pipe 5 inwardly in order to press the protective pipe 5 against the quartz glass of the melting sealing portion 2. Although this pressing piece 28 is not shown in the drawing, it is similarly formed on the attachment body 22 located on the lower side in the drawing.

Next, a method of mounting the fixture on the lamp of the second embodiment will be described. First, as in the first embodiment, one end of the protective pipe 5 is inserted into the fused sealing portion 2 of the quartz glass tube 1 so as to be in close contact therewith. Next, the fixture main body 22 is covered on the outer lower side of the protective pipe 5 inserted into the melt-sealing portion 2, and the pressing metal fitting 21 is further covered on the fixture main body 22 from above to attach the fixture main body 22 from below and above. And press fitting 21
The protective pipe 5 is sandwiched by and, and then the claws 23 and 24 of the fixture body 22 are bent to fix the press fitting 21 to the fixture body 22. Further, at the other end of the protection pipe 5, the claw 2
5 and 26 are bent from both sides and the protection pipe 5 is pressed to be closely attached to the protection tube 3 and fixed. Further, the claw 27 is bent upward to lightly fix the protective tube 3.

Similar to the first embodiment, the same effect can be obtained by winding a tape-shaped protective tube 5 in addition to the pipe-shaped one as the protective tube 5 covering the melt-sealed portion 2. As for the material, the same material as that described in the first embodiment can be used. According to the lamp of the second embodiment, since the protective pipe for preventing the scattering of the quartz glass pieces is attached by bending the nail using the fixture, the protective function of a compact shape can be realized by simple work. In addition,
The second embodiment shows an example of the mounting tool, but any other structure can be used as long as the mounting tool has the above-described function. Is not limited to.

<< Embodiment 3 >> FIG. 4 is a partial perspective view showing one end of a lamp according to Embodiment 3 of the present invention. The lamp of the third embodiment uses a mounting case that replaces the protective pipes of the first and second embodiments. Compared with the lamp of the first embodiment, the configuration of the mounting cases 31 and 32 that does not require the protective pipe is different. It is different. Therefore, the same parts as those in the first embodiment are designated by the same reference numerals and the duplicated description will be omitted. The mounting case used for the lamp of the third embodiment shown in FIG. 4 has an upper mounting case 31 and a lower mounting case 32. The upper mounting case 31 and the lower mounting case 32 each include a melt-sealing portion 2 (not shown in the drawing) that is a connection portion between the quartz glass tube 1 and the protective tube 3 (not shown in the drawing). It is formed of a metal plate that covers the whole from above and below. Further, claw portions 33 and 34 for fastening both metal fittings 31 and 32 are formed in a portion where the end portion 39 of the lower mounting case 32 is attached to the quartz glass tube 1. Both the mounting cases 31 and 32 are fitted into the ends of the quartz glass tube 1 including the fusion-sealed portion from above and below, and the claws 33 and 34 are bent and fixed.

According to the third embodiment, since the melting sealing portion is covered with both mounting cases 31 and 32 formed of a metal plate,
The peeled pieces of quartz glass are confined inside the both mounting cases 31 and 32 and do not scatter to the outside. Further, since the outer side of the protective tube 3 is sandwiched between the mounting cases 31 and 32, it is possible to suppress the intrusion of water vapor from the outside. As a material for both the mounting cases 31 and 32, any material can be applied as long as it is a metal that does not melt or soften at the surface temperature of the quartz glass tube 1, but in consideration of cost and mass productivity, zinc or aluminum coating is used. The iron plate is preferred. Further, both mounting cases 31, 32 or one of them may be made of high heat resistant engineering resin or ceramics.

Although not shown in the drawing, it is also preferable to add a functional part such as a mounting hole for mounting to an external device to at least one of the upper mounting case 31 and the lower mounting case 32. In addition, a material having heat resistance and heat insulation, for example, glass fiber cloth, is inserted in the middle of the portion where the both mounting cases 31 and 32 are attached to the quartz glass tube 1 (inner portions of the claws 33 and 34). Preferably. As a result, both mounting cases 31,
The temperature rise of 32 is suppressed.

In the first to third embodiments described above,
Although the melt-sealed portion at one end has been described, it goes without saying that the other end should have the same configuration. Also,
Although the above embodiment describes the straight tube lamp, the present invention can be applied to other lamps such as a round shape and a rugby ball shape without any problem. The configuration of the present invention can be applied to all lamps of the type in which a quartz glass tube is used and melt-sealed with a molybdenum foil portion, and the heating element material is not limited. By using the lamp of the present invention described above in a heating device or a heating device, it is possible to provide an inexpensive heating device or heating device with improved reliability and safety of the lamp heater.

[0027]

As described in detail in the above embodiments, according to the present invention, in a lamp having a structure in which a quartz glass tube is used and the end portion of the quartz glass tube is melt-sealed with a lead-out portion of molybdenum or tungsten. Since the fusion-sealed portion of the quartz glass tube is not exposed to the outside, it is possible to prevent water vapor or the like from entering the fusion-sealed portion from the outside. Further, even if the molybdenum wire or molybdenum foil is oxidized by the invading water vapor and a crack is generated in the fused glass of the fused glass, the glass piece is confined in the protective pipe. Therefore, the glass pieces do not scatter to the outside, and the glass pieces do not damage the human body, so that a safe lamp can be realized.

By using the lamp of the present invention in a heating device or a heating device, it is possible to provide an inexpensive heating device or heating device with improved reliability and safety of the lamp heater.

[Brief description of drawings]

FIG. 1 is a perspective view of one end of a lamp according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a configuration of a fusion-sealing portion according to the first embodiment.

FIG. 3 is a perspective view of one end of a lamp according to a second embodiment of the present invention.

FIG. 4 is a perspective view of one end of a lamp according to a third embodiment of the present invention.

FIG. 5 is a perspective view of one end of a conventional lamp.

FIG. 6 is an enlarged cross-sectional view of a fusion sealing part in a conventional lamp.

[Explanation of symbols]

1 Quartz glass tube 2 Melt sealing part 3 protection tube 4 lead wire 5 Protective pipe 6 stapler pins 7 mounting case 8 retaining bracket 9, 23, 24, 25, 26, 27, 33, 34 nails 11 internal lead wire 12 Molybdenum foil 13 External lead wire 21 Holding bracket 22 Fixture body 31 Top mounting case 32 Lower mounting case

Claims (7)

[Claims] 1. An internal lead wire having one end connected to an end of a heating element, a molybdenum foil having one end welded to the other end of the internal lead wire, and an external lead wire welded to the other end of the molybdenum foil. A lamp having a heating element structure and a quartz glass tube inserted with the heating element structure, filled with an inert gas, and fused and sealed at both ends of the molybdenum foil portion, the lamp comprising: A lamp characterized in that the melt-sealed portions at both ends are covered with heat-resistant elastic members. 2. The lamp according to claim 1, wherein the heat resistant elastic member is formed of a material in which glass fiber is impregnated with silicon varnish. 3. The pipe-shaped heat-resistant elastic member has one end portion which is externally attached to the fused sealing portion of the quartz glass tube in a close contact state, and the other end portion which is sealed by pressure welding. The lamp according to claim 1 or 2. 4. One end of the pipe-shaped heat-resistant elastic member is externally attached to the fused sealing portion of the quartz glass tube in a close contact state, and the other end of the heat-resistant elastic member is sealed by pressure welding. At the same time, at least a part of the heat-resistant elastic member is fixed to a lamp mounting case. 5. The lamp according to claim 1, wherein the heat resistant elastic member is formed of a metal plate. 6. The lamp according to claim 5, wherein the heat-resistant elastic member is formed of a metal plate that is a lamp mounting case. 7. A heating / heating device comprising the lamp according to claim 1 as a heat source for heating.