JP2007287515A - Ultraviolet lamp, and ultraviolet lamp device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ozone-cleaning low-pressure mercury lamp easily carried even if it is an ultraviolet lamp having a long light emitting part, and increased in size, and capable of preventing large stress from being applied to the lamp in lighting it to break it. <P>SOLUTION: A straight-tube type arc tube 1 having metal bases 2 at both ends is held to sockets 3 attached to a top plate 4 by the metal bases 2. The sockets 3 are each provided with a cooling mechanism, and the coldest part at an end of the arc tube 1 is kept at an optimum temperature. Each socket 3 can be moved only in the lamp axis direction by a spring 5 arranged between the socket 3 and the top plate 4. Thereby, when the top plate 4 is expanded by the heat of the lamp 1, stress applied to a contact point between the socket 3 and the top plate 4 is relaxed by the spring 5. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to a base for a low-pressure mercury lamp for ozone cleaning and a mounting structure to an ozone cleaning apparatus.

Low-pressure mercury lamps are used for fluorescent lamps, liquid sterilization, surface sterilization of substances, etc. by utilizing ultraviolet light emission of mercury, which is a luminescent substance. Also, as a use other than fluorescent lamps and sterilization, a cleaning method (hereinafter referred to as ozone) that decomposes organic pollutants into volatile substances by the action of active oxygen separated by the action of ultraviolet light from ozone generated by the action of ultraviolet light. Cleaning). As this light source, a low pressure mercury lamp for cleaning ozone is used for cleaning the surface of a liquid crystal panel.

In order to reduce the initial cost by reducing the number of lamps, a low-pressure mercury lamp for ozone cleaning with a long light emission length and a single-sided base such as a U-shaped tube or M-shaped tube is used in the ozone cleaning device for liquid crystal panels. It was.

The lamp for this application has many parts similar to a general fluorescent lamp and a sterilization lamp used for water sterilization as a light emission principle. However, fluorescent lamps and sterilizers do not have a special cooling mechanism for controlling the coldest part temperature. In fluorescent lamps, the coldest part temperature is determined by the outside air. The coldest part temperature is controlled by the temperature. The ozone cleaning low-pressure mercury lamp has a special structure for controlling the temperature of the coldest part of the arc tube in order to efficiently extract short-wavelength ultraviolet rays generated by discharge in mercury vapor. This is very different from fluorescent and germicidal lamps. Patent Document 1 discloses a coldest part cooling structure for increasing the output of ultraviolet rays.

As an example of controlling the coldest part temperature of the registered utility model No. 3059348, the heat generated by the discharge is cooled by lighting the metal base made of aluminum in contact with the end of the arc tube, and the lighting Control the temperature of the part of the arc tube inside. And it adjusts so that short wavelength ultraviolet rays may be radiated efficiently. In some cases, the short wavelength ultraviolet rays are adjusted by heating the metal base.

There is also a method that does not use a metal base to control the coldest part temperature of the arc tube. For example, in the method of controlling the temperature of the coldest part by directly bringing the arc tube into contact with the cooling plate, the dimensional variation of the glass forming the arc tube is large, so the contact area with the cooling plate also varies, and in some cases contact Since the area is reduced and it is necessary to spend extra cold water for cooling for temperature control, the ultraviolet light emission efficiency of the entire apparatus is poor and the running cost is high.

Therefore, the effect of UV output control of the ozone cleaning low pressure mercury lamp when the metal base is used to control the coldest part temperature of the arc tube is extremely large. At present, the ozone cleaning low pressure mercury lamp is provided with a metal base, The cleaning apparatus has a cooling plate including the metal base mounting structure.

Also, by using a metal base, the cooling board and the metal base can be mechanically stopped with screws, etc., and by increasing the adhesion between the metal base and the cooling board, the temperature of the cooling board can be more easily transmitted to the metal base. The temperature can be controlled efficiently.

By the way, low pressure mercury lamps for ozone cleaning are also increasing in size in response to the recent increase in size of liquid crystal panels, and ozone cleaning with an effective light emission length of 2.4 M is particularly required for large size lamps in order to support liquid crystal panels called eighth generation. Development of low-pressure mercury lamps for industrial use and ozone cleaning equipment is required.

Conventionally, the ozone cleaning lamp for liquid crystal up to 1800 × 2000 [mm] size called the sixth generation is a U lamp having a long light emission length with one lamp for the purpose of reducing the number of low pressure mercury lamps and ballasts for ozone cleaning. A low-pressure mercury lamp having a shape of a metal base of one side of a letter tube or an M letter has been used in many cases. Further, since the number of lamps is small, it is excellent in maintenance such as lamp replacement.

However, when a single-side base such as a U-shaped tube or an M-shaped tube is adopted due to an increase in the size of a low-pressure mercury lamp for ozone cleaning, a problem concerning carrying has arisen. In other words, when carrying with a base on one side, the light emitting part is long, especially in the U-shaped tube or M-shaped tube. As a result, a large moment was applied to the arc tube and it was broken. Of course, it is conceivable to support the light emitting part as a support when the base is held. In the U-shaped tube and M-shaped tube, the straight tube portion of the arc tube is arranged in parallel, so if only one of the arc tube straight tube portions is gripped and supported, Depending on the weight balance, the light emitting part may be twisted and cracked. Moreover, it was lacking in stability when only the entire light emitting part was touched. Further, similarly, a problem arises that the arc tube breaks during lamp production.

Therefore, in consideration of portability and lamp productivity, we decided to adopt a straight tube type ozone-cleaning low-pressure mercury lamp with metal bases attached to both ends, but a new problem has arisen.

As described above, the ozone-cleaning low-pressure mercury lamp cools the coldest part in order not to make the coldest part temperature higher than the set temperature. The coldest part is provided near the base, and as a cooling method, a water cooling mechanism is generally provided in the socket, and the coldest part near the base can be cooled by firmly fixing the socket and the base. It was.

In order to perform UV output control (temperature control of the coldest part) in the configuration of the conventional U-shaped tube and M-shaped tube, and to fix the lamp, the metal base and the apparatus-side cooling panel are closely fixed with screws, and The metal base was cooling. However, when the base and socket were firmly fixed and installed in the device, the low pressure mercury lamp for ozone cleaning during lighting caused damage. The reason is that the top plate that forms part of the device is made of metal, and its thermal expansion coefficient is higher than that of the synthetic quartz glass that forms the arc tube for low-pressure mercury lamps for ozone cleaning. The top plate expands more than the low pressure mercury lamp for ozone cleaning. FIG. 3 shows a schematic diagram of the entire apparatus. Reference numeral 6 denotes a box made of a top plate, which is omitted in FIG. 3, but a low-pressure mercury lamp for ozone cleaning is arranged inside. Further, the box 6 is supported by a base 7.
FIG. 1 is a cross-sectional view of FIG. 3 and shows an internal mechanism. That is, the lower part of the box in FIG. 3 shows the top plate 4 in FIG. A part of the top plate forming the box 6, particularly a portion near the lamp at the bottom of the box, expands due to the heat of the lamp, but the base 7 does not move, so that the top plate of the expanded part Will be deformed. FIG. 3 (a) shows a device that has not been modified, but in FIG. 3 (b), the expanded portion is lowered and bent by its own weight. Then, as shown in FIG. 4 (a), the socket 3 is inclined in the direction of arrow A, and the conventional base 2 is fixed to the socket 3 and the top plate. . In addition, the top plate may be twisted as shown in FIG. In this case, the socket 3 is twisted in the direction indicated by the arrow B in FIG. 4B, and the base 2, the socket 3, and the top plate are also fixed, so that a large stress is applied to the lamp, resulting in damage. It was. In particular, low pressure mercury lamps for ozone cleaning are used at a high wattage, so the amount of heat generated by the lamps is large and has a large effect on the top plate. .

In view of the above problems, an object of the present invention is to provide a low-pressure mercury lamp for ozone cleaning that is easy to carry and prevents stress from being applied to the low-pressure mercury lamp for ozone cleaning during lighting and damage.

In an ultraviolet lamp apparatus comprising a straight tube type ultraviolet lamp having bases at both ends, a base to which the ultraviolet lamp is attached, and a cooling block connected to the base and holding the lamp in the base part, the base and the A stress buffering mechanism is provided between the lamp and the ultraviolet lamp.

The socket is configured to be rotatable with respect to the base.

The surface of the base that contacts the socket has a convex or concave curved surface, and the surface that contacts the base of the socket is a concave or convex curved surface so as to coincide with the surface of the base.

The socket is installed on the base, and the movable direction of the socket is allowed only in the lamp axis direction by a member having a spring property.

If the configuration of the present invention is used, even a large-sized ozone-cleaning low-pressure mercury lamp with a total length (light emission length) exceeding 2 m is a straight tube type. The weight of the end is not large, so a large moment is not applied. Further, since it is a straight tube type, it is easy to carry without twisting like a U-shaped tube. Further, fixing with a screw or the like is not required for mounting / removing the low pressure mercury lamp for ozone cleaning to / from the apparatus, and mounting / removing can be performed easily. Furthermore, the stress applied to the low pressure mercury lamp for ozone cleaning due to the difference in thermal expansion between the device and the low pressure mercury lamp for ozone cleaning, which is generated by the heat from the low pressure mercury lamp for ozone cleaning while the low pressure mercury lamp for ozone cleaning is lit, is broken. It is also possible to prevent this.

An embodiment of the present invention will be described with reference to FIG.
FIG. 1 shows the internal mechanism of the box in FIG. Reference numeral 1 denotes a straight tube type arc tube having a length of 2.7 m and a diameter of 28.5 mm, which is lit at a rated power of 800 W. At both ends, a metal base 2 having a height of 50 mm and a width of 30 mm is provided. The ozone cleaning low-pressure mercury lamp is held by a socket 3 attached to the top plate by the metal base 2. The socket 3 is equipped with a cooling mechanism, and keeps the coldest part at the end of the arc tube at an optimum temperature. Further, the socket 3 can be moved only in the lamp axis direction by a spring 5 provided between the socket 3 and the top plate 4.

The attachment of the base 2 and the socket 3 will be described with reference to FIG. As shown in (a), the metal base shape has a curved surface with convex ends. The socket 3 also has a concave curved surface that matches the base shape. In this way, the surfaces where the metal base and the socket are in contact with each other are curved surfaces, and as shown in FIG. Further, since the base 2 is not fixed to the socket 3, the top plate 4 expands due to the heat of the lamp, and the top plate (box) is deformed as shown in FIGS. Therefore, the base 2 and the socket 3 are detached as shown in FIG. 4, but the socket 3 is rotatable with respect to the base 2 as shown in FIG. Incidentally, as shown in FIG. 2, the shape of the end of the metal base is not limited to a semispherical tip of the cylinder, but may be formed in a substantially spherical shape.

The ozone cleaning low-pressure mercury lamp can output a large wavelength of ultraviolet light at 254 nm by setting the coldest part temperature to about 40 degrees. Generally, the coldest part is the arc tube end, and the coldest part approaches 40 degrees, so the socket is cooled and the heat is transferred to the base to cool the arc tube end. . That is, the coldest part temperature is kept at the optimum temperature by cooling. Unlike the conventional configuration, since the base and the socket are not closely fixed, there may be a problem of insufficient cooling. However, since the adhesion between the base and the socket is increased due to the characteristics of the spring 5 on the socket side, when the lamp is actually lit and measured, the coldest part can be cooled and the ultraviolet radiation output has no problem.

The socket 5 and the top plate 4 are not fixed by the spring 5, and are configured to be movable only in the lamp axis direction. The movement is restricted by the spring 5 again. Therefore, when the top plate expands due to the heat of the lamp, conventionally, stress is applied to the contact point between the socket and the top plate, but in this configuration, the stress is relieved by the spring. Further, since it is a straight tube lamp, it is easy to mount the socket 3 by providing a spring property.

The present invention is used for a surface sterilization apparatus, an ozone cleaning apparatus, and the like using a straight tube type ultraviolet lamp.

Schematic diagram of equipment using straight tube lamp Diagram showing base and socket mounting structure Schematic diagram of UV lamp device A diagram showing the base and socket mounting structure of the conventional configuration

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Arc tube 2 ... Base 3 ... Socket 4 ... Top plate 5 ... Spring member 6 ... Box 7 ... Base

Claims (4)

In an ultraviolet lamp apparatus comprising a straight tube type ultraviolet lamp having bases at both ends, a base to which the ultraviolet lamp is attached, and a cooling block connected to the base and holding the lamp in the base part, the base and the An ultraviolet lamp device comprising a stress buffering mechanism between the ultraviolet lamp and the ultraviolet lamp. The ultraviolet lamp device according to claim 1, wherein the socket is configured to be rotatable with respect to the base. The surface of the base that contacts the socket has a convex or concave curved surface, and the surface that contacts the socket base so as to match the surface of the base has a concave or convex curved surface. Item 3. An ultraviolet lamp device according to item 1 or 2. 4. The ultraviolet lamp device according to claim 1, wherein the socket is installed on the table, and the movable direction of the socket is allowed only in the lamp axis direction by a member having springiness.

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