CN104470007A - Heater lamp and heating module using the heater lamp - Google Patents

Abstract

The invention provides a long-life heating lamp and a heating module using the heating lamp. According to an embodiment of the present invention, there is provided a heating lamp including a luminous tube, a filament, and an enclosed gas. The luminous tube includes a bent portion and has light transmission. The filament is arranged in the space inside the luminous tube. The filling gas fills the space and contains a rare gas including at least one of argon, krypton, and xenon, bromine, and nitrogen. The electric power per unit length of the filament supplied to the filament is 70 W/cm or more. The volume concentration Cv of nitrogen in the rare gas is not less than 1 vol% and not more than 30 vol%.

Description

Heat lamps and heating modules

technical field

Embodiments of the present invention relate to a heater lamp and a heating module using the heater lamp.

Background technique

For example, in the molding process of a resin container etc., the heat lamp which heats a resin container, and the heating block using a heat lamp are used. Look forward to extending the life of your heat lamps.

Patent Document 1: JP Unexamined Publication No. 2005-32552

Contents of the invention

Embodiments of the present invention provide a long-life heating lamp and a heating module using the heating lamp.

According to an embodiment of the present invention, there is provided a heating lamp including a luminous tube, a filament, and an enclosed gas. The luminous tube includes a bent portion and has light transmission. The filament is arranged in the space inside the luminous tube. The filling gas is filled in the space, and includes a rare gas including at least one of argon, krypton, and xenon, bromine, and nitrogen. The electric power per unit length of the filament supplied to the filament is 70 W/cm or more. The volume concentration Cv of nitrogen in the rare gas is not less than 1 vol% and not more than 30 vol%.

According to the embodiment of the present invention, it is possible to provide a long-life heater lamp and a heating module using the heater lamp.

Description of drawings

FIG. 1 is a schematic diagram illustrating a heater lamp in the first embodiment.

Fig. 2 is a graph illustrating characteristics of a heater lamp in the first embodiment.

Fig. 3 is a schematic diagram illustrating another heater lamp in the first embodiment.

Fig. 4 is a schematic diagram illustrating a heating module in a second embodiment.

In the figure: 10: luminous tube; 10a: one end; 10b: the other end; 11: straight part; 11a: one end; 11b: the other end; 11c, 11d: sealing part; 12: straight part; 12a: one end; 12b: the other One end; 12c: first sealing part; 13: straight line part; 13a: one end; 13b: other end; 13c: second sealing part; 14, 15: bending part; 20: filament; 20a: first end; 2 ends; 21: fixing piece; 30: space; 31: first conductive part; 32: second conductive part; 41, 42: outer lead; 50: air hole; 110, 111: heating lamp; 150: holding part; : Heating module; Cv: Nitrogen volume concentration; T: Color temperature; Wa: The lamp is powered on.

Detailed ways

Embodiments of the present invention will be described below with reference to the drawings.

In addition, the drawings are schematic or conceptual diagrams, and the relationship between the thickness and width of each part, the size ratio between parts, and the like are not necessarily the same as those in reality. In addition, even if the same parts are shown, they may be shown with different dimensions and ratios in different drawings.

In addition, in this-application specification and each drawing, the same code|symbol is attached|subjected to the same element as what was already described by drawing, and detailed description is abbreviate|omitted suitably.

(first embodiment)

FIG. 1 is a schematic diagram illustrating a heater lamp in the first embodiment.

As shown in FIG. 1 , a heater lamp 110 in this embodiment includes a light emitting tube 10 and a filament 20 .

The arc tube 10 includes a bent portion. That is, the arc tube 10 includes a straight portion 11 , a straight portion 12 , a curved portion 14 provided between the straight portion 11 and the straight portion 12 , and a curved portion 15 provided between the straight portion 11 and the straight portion 13 . The straight portion 11 has one end 11a and the other end 11b.

In the embodiment, the angle between the direction in which the straight portion 11 extends and the direction in which the straight portion 12 extends is arbitrary. The straight portion 12 is connected to one end 11 a of the straight portion 11 via the bent portion 14 . That is, one end 12 a of the straight portion 12 is connected to one end 11 a of the straight portion 11 . Between the straight portion 11 and the straight portion 12 , the direction in which the arc tube 10 extends can change continuously and smoothly.

In the embodiment, the angle between the direction in which the straight portion 11 extends and the direction in which the straight portion 13 extends is arbitrary. For example, in this example, the straight portion 13 is parallel to a plane including the straight portion 11 and the straight portion 12 .

The straight portion 13 is connected to the other end 11 b of the straight portion 11 . That is, one end 13 a of the straight portion 13 is connected to the other end 11 b of the straight portion 11 .

For example, the straight portion 13 is juxtaposed with the straight portion 12 along the direction in which the straight portion 11 extends. That is, the direction from the straight portion 12 toward the straight portion 13 is parallel to the direction in which the straight portion 11 extends. The arc tube 10 is, for example, in the shape of a Japanese character "U".

The interior of the luminous tube 10 is isolated from the exterior. The interior of the arc tube 10 is airtight. That is, in this example, the other end 12b of the linear portion 12 of the arc tube 10 serves as the first sealing portion 12c. The other end 13b of the linear portion 13 of the arc tube 10 serves as a second sealing portion 13c.

The filament 20 is disposed in a space 30 inside the luminous tube 10 . For example, the filament 20 extends from the first sealing portion 12c to the second sealing portion 13c via the straight portion 12, the straight portion 11, and the straight portion 13.

The first end 20a of the filament 20 on the side of the first sealing part 12c is connected to the first conductive part 31 sealed in the first sealing part 12c. The second end 20b of the filament 20 located on the side of the second sealing portion 13c is connected to the second conductive portion 32 sealed in the second sealing portion 13c.

The other end of the first conductive portion 31 is connected to the outer lead 41 . At least a part of the outer lead 41 is located outside the arc tube 10 (outside the first sealing portion 12 c ). The other end of the second conductive portion 32 is connected to an outer lead 42 . At least a part of the outer lead 42 is located outside the arc tube 10 (outside the second sealing portion 13 c ).

For example, a holder for holding the filament 20 may also be provided in the luminous tube 10 .

The space inside the arc tube 10 is filled with an enclosed gas (not shown). The filling gas contains noble gases (rare gas elements), bromine, and nitrogen (such as nitrogen molecules). The rare gas includes at least one of argon, krypton, and xenon.

For example, silicon glass is used for the arc tube 10 . A cross section obtained by cutting the arc tube 10 along a plane perpendicular to the direction in which the arc tube 10 extends is, for example, circular.

Mo foil is used for the 1st conductive part 31 and the 2nd conductive part 32, for example. For the outer lead 41 and the outer lead 42, Mo rods are used, for example.

In this embodiment, the volume concentration Cv of nitrogen molecules in the rare gas is 1 vol% or more and 30 vol% or less. The volume concentration of nitrogen molecules in a rare gas can be obtained, for example, by a so-called GC-MS method in which the heater lamp 110 is destroyed in a closed space to recover the gas, separated by gas chromatography, and the molecules are identified by mass spectrometry.

The electric power per unit length of the heater lamp 110 is 70 W/cm or more. The lamp ON power per unit length is a value obtained by dividing the electric power when power is supplied to the heater lamp 110 by the lamp length, which is the filament length (cm) in this embodiment. In the present embodiment, for example, the lamp power is 2000W (watt). The length of the heating lamp 110 is 26 cm (centimeter). Electricity per unit length of the electric lamp is 76.9W/cm. The lamp power per unit length is preferably 70 W/cm or more, more preferably 75 W/cm or more. This is because if the lamp power per unit length is 70W/cm or more, the object to be irradiated by the heater lamp 110 can be irradiated with infrared rays more effectively, and if it is 75 [W/cm] or more, infrared rays can be irradiated better. . The lamp length is preferably in the range of 15 to 50 [cm], more preferably in the range of 20 to 40 [cm]. If the lamp length is less than 10 cm, it will be difficult to form a heater lamp having a bent portion. Furthermore, if the length of the lamp is longer than 50 cm, the power source for supplying electric power to the lamp becomes large, which is not practical.

In the heater lamp 110, when the electric power per unit length of the lamp is 70 W/cm or more, the color temperature T of the heater lamp 110 during operation is 2600 K (Kelvin) or more. That is, the color temperature T of light generated when electric power is supplied to the filament 20 outside the arc tube 10 is 2600 K (Kelvin) or higher so that the electric power per unit length of the lamp is 70 W/cm or higher. The color temperature T can be measured, for example, by using a spectrometer MSR-7000 of Opto Research Co., Ltd., and placing a detector of the spectrometer at a position 1 m away from the light bulb.

According to the embodiment, the discharge of the enclosed gas is suppressed, and the lifetime can be extended. According to the embodiment, a long-life heater lamp can be provided.

If the filament provided inside the heater lamp breaks during lighting, a high voltage is applied between the broken filaments, and discharge may occur between the broken filaments. However, according to the study of the inventors of the present invention, it has been concluded that discharge occurs even in the non-disconnected state. In particular, this phenomenon occurs when the load is high and in non-straight heating lamps with bends. After examining this phenomenon, it was found that an arc discharge phenomenon occurs in the entire interior of the heater lamp immediately after lighting. Due to this arc discharge, the heater lamp is broken. The inventors of the present invention paid attention to this phenomenon.

It was found that in a high-load heater lamp, discharge easily occurs inside the heater lamp due to thermal electron emission from the coil (filament 20 ) or ionization of enclosed gas. At this time, current flows more easily in gas (enclosed in gas) than in filament. In particular, since the luminous tubes of the heater lamp are closer to each other than when they are straight tubes due to the bent portion, electric current flows through the gas of the heater lamp more easily. In addition, it can be seen that the color temperature of light emitted from the filament 20 is related to the thermal electrons emitted from the filament. The higher the color temperature of the filament, the more thermal electrons are emitted from the filament, so discharge is more likely to occur under the condition that the color temperature of the light emitted from the arc tube is 2600K or higher.

The inventors of the present invention conducted experiments by changing the composition of the enclosed gas. From this, it can be seen that the above-mentioned discharge can be suppressed by further introducing nitrogen into the enclosing gas compared to the case of using electron-adsorbing bromine and a rare gas (at least any one of Ar, Kr, and Xe) as the enclosing gas. Nitrogen has a higher discharge start voltage than bromine and rare gases. Discharge can be suppressed by including such nitrogen in the sealing gas.

At this time, it can be seen that if the nitrogen concentration in the enclosed gas is too high, the damage to the filament 20 becomes severe. Furthermore, it can be seen that there is an appropriate nitrogen concentration that can suppress damage to the filament 20 while suppressing the discharge.

In the embodiment, the nitrogen concentration in the enclosed gas is appropriately set. For example, the volume concentration Cv of nitrogen molecules in the rare gas is not less than 1 vol% and not more than 30 vol%. Accordingly, while suppressing discharge, damage to the filament 20 is suppressed.

At this time, adding nitrogen gas to the inert gas can suppress gas discharge compared to the case of only the inert gas. The reason why the gas discharge is suppressed is not clear, but the following cases are conceivable, for example.

The dielectric breakdown voltage of argon, krypton, xenon and other monomers added with nitrogen, or inert gases containing at least two of them, is higher than that of argon, krypton, xenon and other monomers alone, or containing at least two of them. Dielectric breakdown voltage of a gas mixture.

That is, adding nitrogen gas to the inert gas can increase the breakdown voltage, so that the occurrence of gas discharge can be suppressed.

Fig. 2 is a graph illustrating characteristics of a heater lamp in the embodiment.

Here, in order to find the conditions under which discharge does not occur, the inventors calculated the lamp turn-on power [W/cm] per unit length, lamp color temperature T [K], and nitrogen volume concentration Cv [vol%]. The result is shown in Figure 2.

In FIG. 2, "◯" marks indicate that no discharge occurred. The "x" mark indicates that discharge occurred.

It can be seen from FIG. 2 that when the electric power per unit length of the lamp is 70W/cm or more, if the nitrogen volume concentration Cv is 1vol% or more, no discharge will occur. That is, it can be seen that when the color temperature T is 2600K or higher and the electric power per unit length of the lamp is 70 W/cm or higher, discharge does not occur if the nitrogen volume concentration Cv is 1 vol% or higher.

However, when the nitrogen volume concentration Cv is extremely increased, tungsten nitride is generated, and the filament 20 is damaged. As a result, for example, the inside of the arc tube 10 is blackened, or the filament 20 itself is disconnected. If the inside of the arc tube 10 is blackened, the light emitting performance of the heater lamp 110 is lowered, so the quality of the heater lamp 110 is lowered. In addition, if the filament 20 itself breaks, a gas discharge may occur in the heater lamp 110, and the heater lamp 110 may be damaged.

According to the knowledge obtained by the inventors, in order to suppress gas discharge and damage to the filament 20, it is preferable to set the volume concentration Cv of nitrogen to 30 vol% or less.

In addition, using the same luminous tube 10, the length of the lamp is 26 cm, the electric power of the lamp is 3500 W (the electric power of the electric lamp per unit length: 135 W/cm), and the length of the lamp is 28 cm, and the electric power of the electric lamp is 3000 W (per unit length: 135 W/cm). Lamp power-on power: 107W/cm), and lamp length 50cm, lamp power-on power 7000W (light power per unit length: 140W/cm) produced heater lamp 110, and carried out the same test, but When the electric power per unit length of the lamp is 70W/cm or more and the color temperature T is 2600K or more, discharge can be suppressed if the nitrogen volume concentration Cv is 1 to 30 vol%.

According to the present embodiment, discharge can be suppressed. Furthermore, damage to the filament can also be suppressed. Thereby, the lifetime of a heater lamp can be extended.

In addition, an attempt was made to reduce the inrush current by reducing the resistance difference between normal temperature and lighting by adding rhenium to the filament. However, the addition of rhenium increases the electron emission and increases the filament resistance value at startup. Therefore, gas discharge easily occurs.

In the present embodiment, such an increase in electron emission and an increase in the resistance value of the filament at the time of start-up do not substantially occur.

The heater lamp 110 in this embodiment is used, for example, to mold a resin container (for example, a PET bottle or the like). The object to be irradiated heated by the heater lamp 110 in this embodiment is arbitrary.

According to this embodiment, a long-life heater lamp can be provided.

FIG. 3 is a schematic diagram illustrating another heater lamp in this embodiment.

As shown in FIG. 3 , the heating lamp 111 is provided with a luminous tube 10, sealing parts 11c, 11d, a bending part 14, a filament 20, a fixing member 21, a first conductive part 31, a second conductive part 32, an outer lead wire 41, 42, air hole 50.

The fixture 21 supports the filament 20 . At this time, the fixture 21 can support the filament 20 at substantially the center inside the arc tube 10 . The fixing pieces 21 can be arranged on the filament 20 at substantially equal intervals. In addition, for example, the fixture 21 can be formed by winding a heat-resistant wire rod. For example, a wire rod made of tungsten or the like can be wound to form the fixture 21 .

In addition, the shape, size, material, quantity, arrangement, etc. of the fixing tool 21 are not limited to the illustrated ones, and can be changed as appropriate.

The air hole 50 is provided substantially in the center of the arc tube 10 . The air hole 50 is a glass tube (not shown) provided for enclosing an inert gas or nitrogen or bromine (not shown) into the space 30 inside the airtight luminous tube 10 after enclosing an inert gas, nitrogen, or bromine. The remaining portion after being melted by heating. The air hole 50 is formed of quartz glass or the like, for example, like the arc tube 10 . However, the material of the pores 50 is not limited to the illustrated materials, and can be changed as appropriate.

As shown in FIG. 3 , in the heater lamp 111 , the arc tube 10 can be formed, for example, as a tubular body bent as a whole. For example, the arc tube 10 may be formed in a substantially U-shape.

In addition, since the volume concentration Cv of nitrogen gas in the enclosed gas may be the same as that described above, a detailed description thereof will be omitted.

In addition, the electric power per unit length of the lamp is 70 W/cm or more.

In the heater lamp 111 in the present embodiment, as in the above-described heater lamp 110 , the occurrence of gas discharge and the like can be suppressed.

As exemplified above, if the volume concentration Cv of nitrogen gas in the enclosed gas is set as above, the occurrence of gas discharge and the like can be suppressed regardless of the appearance of the heater lamp.

(Second embodiment)

This embodiment relates to a heating module. This heating module includes any one of the heater lamps described in the first embodiment or a heater lamp of a modified example. In the following example, a case where the heater lamp 110 is used will be described.

Fig. 4 is a schematic diagram illustrating a heating module in a second embodiment.

As shown in FIG. 4 , the heating module 210 in this embodiment includes a heating lamp 110 . In this example, a plurality of heater lamps 110 are provided. A holder 150 is also provided in the heating module 210 . The holding part 150 holds the heater lamp 110 .

According to the heating module 210 in this embodiment, a long-life heating module can be provided.

In addition, in the present specification, "perpendicular" and "parallel" are not only strictly perpendicular and strictly parallel, but also include deviations in the manufacturing process, for example, as long as they are substantially perpendicular and substantially parallel.

The embodiments of the present invention have been described above with reference to specific examples. However, the present invention is not limited to these specific examples. For example, with regard to the specific structure of each element such as the luminous tube, filament, conductive part, and electrode included in the heating lamp and the heating module, as long as those skilled in the art make appropriate selections from the known range, the present invention can be similarly implemented, and Obtain the same effect, then all are included in the scope of the present invention.

In addition, any combination of two or more requirements in each specific example within the technically possible range is also included in the scope of the present invention as long as it includes the gist of the present invention.

In addition, all heater lamps and heater modules that can be implemented by appropriately changing the design of the above-mentioned heater lamp and heater module as embodiments of the present invention by those skilled in the art, as long as they include the gist of the present invention, belong to this invention. the scope of the invention.

In addition, within the scope of the concept of the present invention, those skilled in the art can conceive of various changes and modifications, and these changes and modifications also belong to the scope of the present invention.

Some embodiments of the present invention have been described above, but these embodiments are presented as examples and are not intended to limit the scope of the invention. These new embodiments can be implemented in other various forms, and various omissions, substitutions, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and a range equivalent thereto.

Claims (3)

1. A heating lamp, having: A light-transmitting luminous tube including a bent portion; a filament provided in the space inside the luminous tube; and Enclosed gas is filled in the space and contains: at least one rare gas including argon, krypton and xenon, bromine, nitrogen, The electric power per unit length of the filament supplied to the filament is 70 W/cm or more, The volume concentration Cv of nitrogen in the rare gas is not less than 1 vol% and not more than 30 vol%. 2. The heater lamp of claim 1, wherein: The color temperature T of light generated when the electric lamp per unit length is supplied to the filament is 2600 Kelvin or higher outside the arc tube. 3. A heating module, having: A plurality of heating lamps as claimed in claim 1.