JPH0743213A - Lamp unit and device for spectroscopic analyzer using it - Google Patents

Abstract

PURPOSE:To prevent the explosion or devitrification of a lamp even when the lamp is laid down by providing a fan at one end of a lamp house so as to introduce air into he house and, at the same time, projections on the internal surface of the house so as to make the flow velocity of the air the highest around an arc section. CONSTITUTION:A lamp house 118 is provided with a fan 122 at one end and an exhaust port 126 which acts as a vent hole at the other end. Outside air is introduced into the house 118 by means of the fan 122 and discharged from the port 126. As a result, a bulb 112 is cooled by the air. Fins 128 as projecting sections having slopes inclined toward the spherical part 113 of the bulb 112 are provided on the internal surface of the house 118 so as to reduce the inside diameter of the house 118 around the spherical part 113 compared with the inside diameter of the house on the intake and exhaust sides. As a result, the flow velocity of the air becomes faster toward the spherical part 113 at the tops of the fins 182. Therefore, even when a small-sized fan 122 is used, the spherical part 113 can be sufficiently cooled with air.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a cooling mechanism for a lamp unit, particularly a short arc type lamp.

[0002]

2. Description of the Related Art Short arc type lamps such as xenon lamps, metal halide lamps and mercury lamps are widely used as light sources for spectroscopic analyzers such as fluorescence detectors. In FIG. 5, the xenon short arc type lamp (hereinafter,
The general configuration of a xenon lamp) is shown. As shown in the figure, the xenon lamp 10 includes a bulb 12 formed in an elongated shape, electrode bases 14a and 14b in which both ends of the bulb 12 are fitted, and the electrode bases 14a and 14b.
And electrode mandrels 16a and 16b respectively implanted in

Further, a bulb spherical portion 13 filled with xenon gas is formed in the center of the bulb 12, and the electrode mandrel 16 is formed in the bulb spherical portion 13.
The tips of a and 16b are arranged close to each other. And
A high voltage is applied to the electrode bases 14a and 14b to cause arc discharge between the electrode mandrels 16a and 16b, and the xenon lamp 10 is turned on.

Here, when the xenon lamp 10 is turned on, a large amount of heat is generated between the electrode mandrels 16a and 16b where the arc is generated, and the temperature of the tube wall of the bulb spherical portion 13 also rises. In the case of a 150 W xenon lamp or the like, the atmospheric pressure in the bulb spherical portion 13 is 40 to 50.
Atmospheric pressure is reached. Therefore, unless sufficient heat is dissipated on the tube wall of the bulb portion 13, the bulb portion 13 may explode due to temperature rise.

Further, if the temperature of the bulb portion 13 rises abnormally, the glass forming the bulb portion 13 may be altered and so-called devitrification may occur. Here, as shown in FIG. 6, in the lamp house 18, the bulb 1
2 is installed so that the longitudinal direction is vertical (hereinafter, vertically installed), and as shown in FIG. 7, the valve 12 is installed so that the longitudinal direction is horizontal (hereinafter, horizontally installed).
There is a great difference in temperature rise on the tube wall of the bulb portion 13.

That is, when the xenon lamp 10 is turned on, heat is generated from the arc 20 in the bulb spherical portion 13 to generate a convection of xenon gas shown by the arrows in FIGS. 6 and 7, and the convection heats the arc. Bulb part 1
Carried above each of the three. In the case of the vertical installation shown in FIG. 6, the heat carried above the bulb spherical portion 13 is spread over a relatively large area from the bulb spherical portion 13 to the end portion (hatched portion 13a shown in FIG. 6). Since it diffuses and radiates heat, it is possible to prevent an extreme temperature rise of the bulb portion 13.

On the other hand, in the case of the horizontal placement shown in FIG. 7, the heat carried above the bulb spherical portion 13 is concentrated on a limited point (shaded portion 13a in the same figure) of the bulb spherical portion 13. As a result, the heat dissipation efficiency is poor, and an abnormal temperature rise of the shaded portion 13a which is the heat concentration point is caused. Therefore, in the conventional fluorescence detector, the lamp house 1
The xenon lamp 10 was installed vertically in the chamber 8 to prevent an extreme temperature rise in the bulb bulb portion 13.

[0008]

However, when the xenon lamp 10 is installed vertically in the fluorescence detector,
There are some problems. That is, when the xenon lamp 10 is installed vertically in the lamp house 18,
The height of the lamp house 18 becomes equal to or longer than the length of the bulb 12, and the fluorescence detector itself becomes very high and large. Further, if the lamp house 18 is filled to the full height of the fluorescence detector, it is not possible to arrange an optical system, an electric system part, etc. in the vertical direction of the lamp house 18,
The degree of freedom in design is narrowed.

[0009] Further, it is often the case that another device is placed on the fluorescence detector for fluorescence measurement. For this reason, it is desirable that the lamp outlet is provided on the side surface of the fluorescence detector rather than on the top surface. However, when the xenon lamp 10 is installed vertically, the diameter of the lamp outlet has to be equal to or larger than the length of the xenon lamp 10, and the installation location of the lamp outlet is greatly limited, and it should be provided on the side surface. If you cannot do it, it will happen. As described above, there are various problems caused by vertically installing the xenon lamp 10.

The above problem is caused by the xenon lamp 10.
However, as described above, there is a problem that the temperature of the bulb spherical portion 13 rises due to the horizontal installation of the xenon lamp 10.
The above-mentioned problem of temperature rise can be suppressed by heating the xenon lamp 10 in pulses to reduce the amount of heat generated by the arc. However, the pulsed lighting causes variations in the light intensity of each flash, which increases noise and is not practical. Will end up.

Further, when the xenon lamp 10 is installed horizontally, there is a problem that the arc generated between the electrode mandrels 16a and 16b is distorted. That is, when the xenon lamp 10 is installed vertically, the arc 20 is generated symmetrically with respect to the central axis of the xenon lamp 10 as shown in FIG. 6, but when installed horizontally, the arc 20 shown in FIG. The arc 20 is greatly bent upward due to the convection of xenon gas, as shown in FIG. Therefore, the emission of the xenon lamp 10 becomes unstable, which causes an increase in noise of the fluorescence detector, and at the same time, there arises a problem that the emission from the arc 20 cannot be efficiently collected due to the deformation of the arc 20.

Further, when the arc 20 bends so much that the arc 20 contacts the tube wall of the bulb spherical portion 13, the temperature of the tube wall further rises, causing devitrification of the bulb spherical portion 13, and This leads to a decrease in strength.
The present invention has been made in view of the above problems of the prior art, the object is to prevent the temperature rise of the bulb due to heat generation of the arc during continuous lighting, even when the longitudinal direction of the short arc type lamp is installed horizontally, and It is an object of the present invention to provide a lamp unit in which arc distortion does not occur and a spectroscopic analyzer using the lamp unit.

[0013]

In order to achieve the above object, the lamp unit according to claim 1 of the present invention comprises:
A lamp that is lit by an arc, a lamp house that houses the lamp, a fan that is provided at one end of the lamp house and that guides air into the lamp house, and a vent that exhausts air outside the lamp house or inhales air into the lamp house. A mouth and a protrusion provided on the inner wall of the lamp house near the arc portion of the lamp are provided.

The lamp unit according to claim 2 is
It is a short arc type lamp in which the lamp is formed in an elongated shape and arc discharge is performed in the vicinity of the central portion of the lamp, and in the lamp house, the longitudinal direction of the lamp is installed horizontally in a substantially horizontal direction. Characterize. Further, in the lamp unit according to claim 3, a magnet is provided in the vicinity of the lamp where the arc is generated, and an electromagnetic force is generated in a direction in which the arc is pushed down by an interaction between a magnetic force line generated around the arc and a magnetic force line generated from the magnet. The magnet is arranged at a position. Further, a spectroscopic analyzer according to a fourth aspect is characterized by incorporating the lamp unit according to the second and third aspects.

[0015]

In the lamp unit according to the present invention, a fan is provided at one end of the lamp house as described above, and air is introduced into the lamp house by rotating the fan. Further, since the lamp house is provided with the ventilation port, ventilation is performed between the fan and the ventilation port. Further, since the protrusion is provided on the inner wall of the lamp house around the arc portion of the lamp, the inner diameter of the lamp house at the protrusion is smaller than the inner diameter of both ends by the amount of protrusion of the protrusion.

Therefore, the flow velocity of the air ventilated in the lamp house becomes higher in the vicinity of the arc portion of the lamp than in the both ends of the lamp house, the heat removal efficiency is extremely high in the high heat bulb portion, and the temperature is relatively low. The heat removal efficiency is suppressed at both ends of the bulb, and the heat generated in the arc portion is radiated very efficiently from the lamp tube wall, and the temperature difference between the lamp portions can be reduced.

Therefore, even if the short arc type lamp is installed horizontally with a very low heat dissipation efficiency, it is possible to prevent an abnormal temperature rise of the lamp and prevent explosion of the lamp and devitrification of glass. The lamp unit according to claim 3 has a magnet near the lamp where the arc is generated. Then, the magnet is arranged at a position where an electromagnetic force is generated in a direction to push down the arc.

That is, since the arc is generated by the flow of electrons from the negative pole to the positive pole of the lamp, it is considered that the arc is a current flow, and a magnetic field is generated around the arc. As shown in FIG. 4, when the lamp is placed perpendicularly to the plane of the paper and is turned on, if the negative pole of the lamp is the back side and the positive pole is the front side, the magnetic field lines in a clockwise direction around the arc. Φ ₁ occurs. On the other hand, on the right side of the lamp,
When the magnet is arranged with the N pole facing the lamp side, a line of magnetic force Φ ₂ from the magnet to the N pole to the S pole is generated. For this reason,
The electromagnetic force generated by the magnetic lines of force Φ ₁ and the magnetic lines of force Φ ₂ works in the direction of pushing down the arc.

Therefore, when the lamp is installed horizontally as described above, the upward bending force of the arc generated by convection and the downward force of the electromagnetic force are canceled out, and the distortion of the arc can be prevented. Further, in the spectroscopic analyzer according to claim 4, since the lamp unit in which the lamp is horizontally installed is incorporated in the lamp house, the analyzer itself can be held down and downsized, and an optical device can be installed at the upper and lower positions of the lamp house. It is possible to arrange the system and electrical system, which increases the degree of freedom in design.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a schematic configuration of a lamp unit according to one embodiment of the present invention. FIG. 1 (A) is a side view and FIG. 1 (B) is a top view. It should be noted that the reference numeral 100 is added to the portion corresponding to the above-mentioned prior art to omit the description. The lamp unit shown in FIG.
It has a xenon lamp 110, a fan 122, an exhaust port 126, and a fin 128 as a protrusion.

The xenon lamp 110 has a bulb 112 formed in an elongated shape, electrode bases 114a and 114b provided at both ends of the bulb 112, and the electrode bases 114a and 114b, respectively. 112
Has a centrally extending electrode mandrel 116a, 116b, and the xenon lamp 110 is horizontally arranged in a lamp house 118 of a housing. Also, the valve 1
12, the bulb spherical portion 113 is formed in the center,
In the bulb spherical portion 113, the electrode mandrel 116
The tips of a and 116b are arranged close to each other.

The electrode bases 114a, 114
When a high voltage is applied to the electrode b, the electrode mandrel 116a, 116b
An arc 120 is generated between them and the xenon lamp 110 is turned on. Here, when the xenon lamp 110 is turned on, convection of xenon gas occurs in the bulb spherical portion 113 as shown in FIG. 7, and the heat of the arc is carried upward as described above, and the bulb wall of the bulb spherical portion 113 is conveyed. Part of the temperature rises abnormally.

Therefore, it is necessary to increase the heat radiation efficiency of the bulb spherical portion 113 and suppress the temperature rise of the bulb spherical portion 113 within an allowable range. In order to increase the heat radiation efficiency, it is effective to blow air at a high speed on the bulb 112, particularly the bulb-shaped bulb portion 113 of the high temperature heat generating portion, to perform air cooling. Therefore, in the lamp unit according to the present embodiment, first, the fan 122 is provided at one end of the lamp house 118, and the exhaust port 126 which is a ventilation port is provided at the other end.

When the fan 122 is rotated, the air outside the lamp house 118 is sucked from the fan 122 and exhausted from the exhaust port 126. This allows
The inside of the lamp house 118 is ventilated, and the bulb 112 is blown with air to be air-cooled. By the way, when the 150 W xenon lamp 110, which is generally used for a light source such as a fluorescence detector, is air-cooled, in order to suppress the temperature rise of the bulb bulb portion 113 to an allowable value, the wind speed in the bulb bulb portion 113 is 4 m / min. Experiments revealed that it had to be more than a second.

However, in order to ventilate the entire lamp house 118 at a wind speed of 4 m / sec or more, the fan 12
The intake force from 2 must be very high, which causes the fan 122 to become large. Therefore, even though the xenon lamp 110 is horizontally arranged to reduce the size of the spectroscopic analyzer, if the large fan is attached, the spectroscopic analyzer becomes large as a result, and the effect of the lateral placement is diminished. I will end up.

Therefore, in this embodiment, the fins 128 are further provided on the inner wall of the lamp house 118, and the fan 1
The required wind speed is generated in the bulb portion 113 of the valve while keeping the size of 22 small. That is, by providing the fins 128 having an inclination toward the bulb spherical portion 113 on the inner wall of the lamp house 118, the bulb spherical portion 1 has a smaller diameter than the inner diameters of the intake side and the exhaust side at both ends of the lamp house 118.
The inner diameter of the lamp house 118 around 13 is reduced.

Therefore, the flow of the air sucked from the fan 122 in the lamp house 118 is
The speed increases as it goes to the vicinity of the bulb spherical portion 113 located at the apex of 8. Therefore, even if the suction force of the fan 122 is weak and the wind speed at the intake side end of the lamp house 118 is low, the wind speed becomes high around the bulb spherical portion 113, so that even the small fan 122 sufficiently cools the bulb spherical portion 113 by air. It becomes possible to do.

Since the inner diameter of the lamp house 118 increases again from the vicinity of the bulb spherical portion 113 toward the exhaust port 126, the wind speed exhausted from the exhaust port 126 becomes slower, and the influence of exhaust is taken into consideration. The spectroscopic analyzer can be installed without doing so. As described above, in the lamp unit according to the present embodiment, since the fins 128 are provided so that the diameter of the inner wall of the lamp house 118 becomes the smallest around the bulb spherical portion 113, the wind speed around the bulb spherical portion 113 is increased. The fastest, xenon lamp 1
The bulb spherical portion 113 that has a high temperature even when 10 is placed horizontally
It is possible to efficiently cool the air.

Further, the extremely high temperature bulb portion 1 of the valve mentioned above.
Only in No. 13, the wind speed is increased to improve the air cooling efficiency, and at both ends of the bulb 112 having a relatively low temperature, the wind speed is decreased to suppress the air cooling efficiency, thereby making it possible to reduce the temperature difference in each part of the lamp and to reduce the strength of the lamp. Can be prevented. Further, in the lamp unit according to the present embodiment, as shown in FIG. 1B, the magnet 129 is provided on the wall surface of the lamp house 118 on the side of the bulb spherical portion 113.

As described above, when the xenon lamp 110 is arranged horizontally, the arc 12 of the bulb spherical portion 113 is arranged.
0 is pushed up and deformed by convection. Therefore,
As shown in FIG. 1 (B), the right side in the figure is the − pole and the left side is the + pole, and the magnet 129 has the N pole on the bulb spherical portion 113 side.
The S pole is placed on the opposite side. Therefore, the arc 120
As shown in FIG. 4, lines of magnetic force are generated around the magnet and the magnet 129, and the arc 120 is pushed down by the electromagnetic force. Therefore, if the electromagnetic force is adjusted by the strength of the magnet 129 and the mounting position so as to balance with the force pushed up by the convection, the deformation of the arc 120 can be prevented.

FIG. 2 is an explanatory view of a schematic structure of a fluorescence detector using the lamp unit. The fluorescence detector shown in the figure uses a xenon lamp 110 installed in the lamp house 118 as a light source, and the light from the xenon lamp 110 is condensed by a condenser mirror 130 and is incident on an excitation side spectroscope 132. Then, the excitation side spectroscope 13
The excitation light is emitted from the second emission slit, and the excitation light is applied to the sample in the cell 134. Then, the fluorescence emitted from the sample is incident on the fluorescence-side spectroscope 136 arranged at a position orthogonal to the optical path of the excitation light, and the fluorescence is measured by the fluorescence-side spectroscope 136.

The fluorescence detector according to this embodiment is
A lamp unit in which a xenon lamp 110 is installed horizontally is used in the lamp house 118, and FIG. 3 shows a schematic configuration diagram of the peripheral portion of the lamp unit of the fluorescence detector. In addition, the same figure (A) is a top view and the same figure (B).
Is a side view. Further, the parts corresponding to those in FIG.

As is apparent from the figure, the lamp house 118 can be made thin by horizontally disposing the xenon lamp 110. As a result, for example, when the xenon lamp 110 having a length of about 150 mm is used, the height of the entire fluorescence detector can be suppressed to 150 mm or less, and further, as shown in FIG.
It is also possible to dispose the condenser mirror 130 below. On the other hand, when the conventional xenon lamp 110 is arranged vertically, the overall height of the fluorescence detector is 200 when the mechanism for applying a high voltage to the electrodes at both ends of the xenon lamp 110 is taken into consideration.
mm or more.

As described above, the fluorescence detector according to the present embodiment can be made thin and compact, the degree of freedom in the arrangement design of the optical system is increased, and the efficiency of collecting light from the xenon lamp 110 is improved. It becomes possible. Further, in the figure, the small fan 122 and the fan 1
A filter 140 for removing dust in the air provided on the outside of 22 is provided as a lamp outlet on the side surface of the fluorescence detector so as to be openable and closable, and the xenon lamp 110 can be easily opened by opening the lamp outlet. Can be exchanged.

As described above, the fluorescence may be measured by placing another device on the fluorescence detector, and this tendency is particularly remarkable in the case of the fluorescence detector for liquid chromatograph. That is, since the reaction system system is often used in the use of the fluorescence detector, the device configuration is increased, so that it is necessary to stack the devices in order to effectively use the space. For this reason, it is preferable to provide the lamp outlet on the side surface of the fluorescence detector, but in the case of the vertical arrangement of the conventional xenon lamp 110, a very large outlet must be provided, which is very difficult in design. There is a case.

However, in the lamp unit of the fluorescence detector according to the present embodiment, by disposing the xenon lamp 110 in a horizontal position, the lamp outlet may be made slightly larger than the diameter of the xenon lamp 110. The above problem does not occur. As described above, in the fluorescence detector according to the present embodiment, the degree of freedom in designing the installation location of the lamp outlet is increased, the xenon lamp 110 can be easily replaced, and the maintainability is improved.

[0037]

As described above, according to the lamp unit of the present invention, even if the lamp is placed horizontally in the lamp house, the heat dissipation efficiency is very excellent, and therefore the lamp does not explode or devitrify. Can be prevented. Further, since the spectroscopic analyzer according to the present invention uses the lamp unit, the height of the entire apparatus can be suppressed to be small and downsized. Furthermore, by arranging the lamp horizontally, it is only necessary to provide a small-diameter outlet on the side of the spectroscopic analyzer as the lamp outlet, and it is possible to replace the lamp even when the devices are stacked on the spectroscopic analyzer. .

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a schematic configuration of a lamp unit according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of constituent blocks of a fluorescence detector according to an embodiment of the present invention.

FIG. 3 is an explanatory diagram of a schematic configuration of a lamp unit peripheral portion of the fluorescence detector according to the embodiment of the present invention.

FIG. 4 is a diagram illustrating the generation of electromagnetic force by a magnet used in the lamp unit according to the embodiment of the present invention.

FIG. 5 is an explanatory diagram of a schematic configuration of a general xenon lamp.

6 is an explanatory diagram in which the xenon lamp shown in FIG. 5 is vertically arranged in a lamp house.

FIG. 7 is an explanatory diagram in which the xenon lamp shown in FIG. 5 is horizontally placed in a lamp house.

[Explanation of symbols]

 10, 110 ... Xenon short arc type lamp 12, 112 ... Bulb 13, 113 ... Bulb bulb portion 14, 114 ... Electrode base 16, 116 ... Electrode mandrel 18, 118 ... Lamp house 20, 120 ... Arc 122 ... Fan 126 ... Exhaust port 128 ... Fins

Claims (4)

[Claims] 1. A lamp that is lit by an arc, a lamp house that houses the lamp, a fan that is provided at one end of the lamp house and that guides air into the lamp house, and exhausts the lamp house or a lamp house. A lamp unit, comprising: a vent for inhaling air into the lamp; and a protrusion provided on an inner wall of the lamp house, the protrusion being located near an arc portion of the lamp. 2. The lamp unit according to claim 1, wherein the lamp is formed into an elongated shape, and is a short arc type lamp in which an arc is generated in a central portion of the lamp. In the lamp house, a longitudinal direction of the lamp is A lamp unit characterized by being installed horizontally in a substantially horizontal position. 3. The lamp unit according to claim 2, wherein a magnet is provided in the vicinity of the lamp where the arc is generated, and an electromagnetic force is generated in a direction in which the arc is pushed down by an interaction between the magnetic force line generated around the arc and the magnetic force line generated from the magnet. The lamp unit is characterized in that the magnet is disposed at a position where 4. A spectral analyzer incorporating the lamp unit according to claim 2 or 3.