JP2520949Y2 - UV lamp - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to an ultraviolet lamp, and more particularly to an ultraviolet lamp which can be suitably used in fields closely related to daily life such as sterilization of drinking water and food. .

[Prior art and its problems]

Light in the wavelength range of 240 nm to 400 nm emitted from ultraviolet lamps such as low-pressure mercury lamps and flash lamps has been used in various industrial fields. It causes reactions, biological reactions, etc. to maintain food hygiene and freshness, washing, generation of chemical substances,
It has come to be widely used for treatment of the human body. In other words, it has been widely used in fields that are closely related to daily life, but the UV lamp may be damaged due to mistakes when installing or replacing the UV lamp. When it is a fluid such as liquid or ozone gas for food sterilization, it may be damaged by fluid impact (water hammer etc.) when the liquid collides with the ultraviolet lamp. And, if the UV lamp is damaged, fragments of the glass bulb and mercury, which is the encapsulating substance for light emission, will scatter in and around the irradiated object, inducing a dangerous state in the human body, and a great deal of labor for cleaning after the fact. It is mentioned as one of the problems of the ultraviolet irradiation system using the ultraviolet lamp.

[Purpose of device]

Therefore, the present invention has been made in view of the problems of the prior art, and an object of the present invention is to break the glass bulb of the ultraviolet lamp or to make mercury as a light emission encapsulating material even if the glass bulb of the ultraviolet lamp is damaged. It is to provide a safe UV lamp that does not scatter.

[Constitution of the device and its use]

The ultraviolet lamp of the present invention has a glass bulb that transmits at least light with a wavelength of 240 nm or more, and 50% of the required light in the wavelength range of 240 nm to 400 nm is provided on the outer surface of the glass bulb.
It is characterized in that it is coated with a thin film made of a fluororesin having a thickness of 0.1 mm or more for transmitting light.

That is, the resin thin film that coats the outer surface of the glass bulb allows 50% or more of the light in the wavelength range of 240 nm to 400 nm to be transmitted, and thus the performance as an ultraviolet lamp can be sufficiently maintained, but if the glass bulb is damaged, However, the thickness of the thin film is 0.1m
Since the thickness is m or more, the strength is high, and the thin film prevents the fragments of the glass bulb and the emission encapsulating material such as mercury from scattering, thus ensuring the safety. Also, 240nm ~ 400
UV rays in the wavelength range of nm are said to be in the UVC range, but ordinary resin thin films deteriorate in a short time when they receive UV in this range, but the thin film of the present invention is made of fluorine resin. Even if it receives ultraviolet rays in this region, it is hardly deteriorated and has an advantage that it can be used stably for a long time.

〔Example〕

Hereinafter, the present invention will be specifically described based on embodiments shown in the drawings.

FIG. 1 shows an example in which the present invention is applied to a low-pressure mercury lamp that has a total lamp length of 500 mm, power consumption of 25 W, and mainly emits light with a wavelength of 254 nm. A glass bulb with an outer diameter of 15 mm and a quartz glass that transmits light with a wavelength of 254 nm 1
Bases 11 are attached to both ends of 0, and lead wires 12 extend from the bases 11, respectively. Then, on the outer surface of the glass bulb 10, a resin thin film 13 indicated by a dotted line is shown for convenience.
Is coated. This thin film 13 uses a tube made of tetrafluoroethylene resin, which is a fluorine-based resin, and has a wall thickness of
The transmittance of 254 nm light at 0.2 mm was 72%. Further, since the thin film 13 is made of a fluorine-based resin, it is hardly deteriorated even when it receives ultraviolet rays in the wavelength range of 240 nm to 400 nm, which is said to be in the UVC region, and can be used stably for a long period of time.
Then, when the low-pressure mercury lamp was forcibly damaged, if the thickness of the thin film 13 was 0.1 mm or more, the glass bulb 1
Fragments of 0 and mercury as an inclusion did not scatter out of the thin film 13.

FIG. 2 shows an example in which the present invention is applied to a fluorescent lamp which has a total lamp length of 500 mm, power consumption of 25 W, and mainly emits light with a wavelength of 370 nm. The outer diameter is 15 mm and the wavelength is
Glass bulb made of soft glass that transmits 370 mm light 1
Bases 11 are attached to both ends of 0, and connecting pins 14 extend from the bases 11. And the glass bulb 10
Similarly, the outer surface of the is covered with a thin film 13 made of resin. This thin film 13 uses a resin tube made of a copolymer of fluorine tetrafluoride ethylene and propylene hexafluoride, which has a transmittance of 370 nm light when the wall thickness is 0.2 mm. 88
%Met. Even if this fluorescent lamp was broken in the same manner, if the thin film 13 had a thickness of 0.1 mm or more, the fragments of the glass bulb 10 did not scatter out of the thin film 13.

As described above, when the thickness of the thin film 13 is 0.1 mm or more, it is possible to achieve the purpose of preventing the scattering of fragments of the glass bulb 10 and mercury that is an enclosed material, and to use it in fields that are closely related to life. You can ensure safety in the case as well,
If the wall thickness becomes large, the intensity of transmitted ultraviolet rays will decrease, and the irradiation time will become longer, and the number of lamps will increase, so the wall thickness of the thin film 13 is preferably about 0.1 mm to 0.3 mm.

As the material of the thin film 13, other than the above-mentioned resin,
For example, tetrafluoroethylene-ethylene copolymer resin (ETFE),
Fluorine-based resins such as ethylene trifluoride resin (PCTF) and chlorotrifluoro-ethylene copolymer resin (ECTFE) can be used, but in any case, these resins are tough even in a thin film form, and It has the characteristics of high transparency and deterioration resistance of ultraviolet rays.

[Effect of device]

As described above, in the ultraviolet lamp of the present invention, the outer surface of the glass bulb is coated with a resin thin film having a thickness of 0.1 mm or more that transmits 50% or more of the required light in the wavelength range of 240 nm to 400 nm. Therefore, even if the glass bulb is damaged, the fragments and mercury as the enclosed material do not scatter, and the reliability of the ultraviolet irradiation system using the ultraviolet lamp can be improved.

[Brief description of drawings]

FIG. 1 is an illustration of a low-pressure mercury lamp according to the present invention, and FIG. 2 is an illustration of a fluorescent lamp. 10 …… Glass bulb, 11 …… Base 12 …… Lead wire, 13 …… Thin film 14 …… Connecting pin

Claims (1)

(57) [Scope of utility model registration request] 1. A glass bulb which transmits at least light having a wavelength of 240 nm or more is provided, and an outer surface of the glass bulb has:
An ultraviolet lamp characterized by being coated with a thin film made of a fluororesin having a thickness of 0.1 mm or more, which transmits 50% or more of necessary light in the wavelength range of 240 nm to 400 nm.