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  • Talking about the working principle and instructions of ultraviolet germicidal lamp

Talking about the working principle and instructions of ultraviolet germicidal lamp

2022.09.30 Edit: Juguang Read:7041

1、 Working principle of ultraviolet germicidal lamp

Ultraviolet is an invisible light wave, which exists outside the ultraviolet end of the spectrum, so it is called ultraviolet. According to different wavelength ranges, it is divided into three bands: A, B and C. The wavelength of ultraviolet in band C is 240-260nm, which is the most effective sterilization band. The strongest point in the band is 253.7nm.

Modern ultraviolet disinfection technology is based on modern epidemic prevention, optics, biology and physical chemistry, and uses specially designed high-efficiency, high-intensity and long-life C-band ultraviolet light generator to irradiate running water (air or solid surface) with strong ultraviolet C-light. When various bacteria, viruses, parasites, algae and other pathogens in water (air or solid surface) are exposed to a certain dose of ultraviolet C-light, The DNA structure in its cells is destroyed, so as to kill bacteria, viruses and other pathogens in water without using any chemical drugs, so as to achieve the purpose of disinfection and purification.

2、 Instructions for use of ultraviolet germicidal lamp:

Ultraviolet germicidal lamp has strong germicidal efficacy. It is suitable for sterilization in health, medical, biological research, pharmaceutical industry and food industry, as well as photochemical reaction, food storage and room air disinfection. This product is easy to use, simple to operate, long life and reliable.

1. The wiring method and accessories are the same as those of fluorescent lamps of the same power.

2. When loading and unloading the lamp tube, try to avoid directly touching the surface of the lamp tube with hands, so as not to cause leakage and affect the germicidal efficacy.

3. Ultraviolet rays are harmful to organic cells. People's skin and eyes will be burned when exposed to ultraviolet rays. Pay attention to protection.

4. The lamp tube shall be kept in a dry and non corrosive gas environment.

5. Specifications: 40W, 30W, 20W, 15W, etc.

Glass, ultraviolet ray can not penetrate, and can emit visible light after being absorbed by fluorescent powder; The germicidal lamp tube is made of transparent purple money glass or quartz glass. Ultraviolet rays are transmitted through the wall of the glass tube. Ultraviolet light with 254nm wavelength is easily absorbed by organisms, which acts on DNA, the genetic material of organisms, causing DNA damage and bacterial death. The interaction of 185 nm ultraviolet light with air can produce ozone with strong oxidation, which can effectively kill bacteria. Ultraviolet rays can concentrate high intensity to kill bacteria and viruses in a short time; As shown in Table 1, the killing efficiency of ultraviolet light on various bacteria and viruses is described. Ultraviolet disinfection belongs to pure physical disinfection method, without secondary pollution; According to the guidance of disinfection and sterilization technical standards, each microorganism has its own specific ultraviolet ray killing and death dose standard, and its dose is the product of irradiation intensity and irradiation time (K (sterilization dose)=I (irradiation intensity) t (irradiation time)). According to the formula, the effect of high intensity short time irradiation is the same as that of low intensity long time irradiation. Ultraviolet lamp tube is made of pure quartz glass tube made of natural crystal. At present, due to different cost and use, it is also replaced by high borax glass tube, and its characteristics and effects are quite different. The pure quartz tube made of natural crystal and the high borax glass tube made of high borax not only have a lot of difference in effect, but also have several times of difference in price. Therefore, different choices should be made depending on where they are used. The ultraviolet transmittance of pure quartz tube is more than 80%, and that of high borax glass tube is less than 50%.

According to the above data, unless the complete disinfection is considered as a non important factor and the service life is not considered as the key equipment, the ultraviolet disinfection lamp tube made of quartz glass tube should be considered. The penetration of ultraviolet rays is not as high as expected. Any paper, lead glass, or plastic will greatly reduce the exposure intensity. Therefore, the dust and oil stains on the lamp tube will directly affect its penetration ability. Therefore, the new lamp should be wiped with 75% alcohol gauze before use to remove oil stains, hand sweat and dust. The lamp tube and quartz tube in use shall be wiped and cleaned regularly to avoid affecting the ultraviolet ray transmittance and radiation intensity. Ultraviolet rays have a strong killing effect on bacteria and also cause certain harm to human body. The most vulnerable part of human body is the cornea of the eye. Therefore, you can not directly look at the lighted lamp tube with your eyes at any time to avoid injury. If you have to look, use ordinary glass (wear glasses) or transparent plastic sheets as protective masks. Never use quartz glass by mistake, because ordinary glass can hardly penetrate ultraviolet ray. Once injured, there is no need to panic. After facial burns, the skin will fall off after a few days, and it will heal without medicine. Eye injuries can cause redness, swelling, tears and tingling, which can take about three or four days to heal. In any case, it is still recommended to consult a doctor immediately in case of injury.

Ultraviolet germicidal lamp is widely used in the field of water treatment. Water treatment is classified by the method of using ultraviolet germicidal lamp. The lamp is directly put into water, which is called immersion type; The ultraviolet lamp is put into the casing for use, which is called over-current type. (At present, the over-current method is mainly used.) Compared with the overflow type, the submerged type has a simple structure. The ultraviolet germicidal lamp is directly placed in water. This method can be used for flowing dynamic water or static water. This treatment method should pay attention to the possibility that the lamp tube may break due to unexpected circumstances; After a long time of treatment, the surface of the lamp will be covered by pollutants such as algae in the water, which will seriously affect the UV transmission. The ultraviolet sterilizing lamp mainly applies its sterilizing function in water treatment. For example, the working principle of overflow type equipment is as follows: the water with a certain flow rate generated by the pressure of the water pump flows through the periphery of the quartz sleeve that can penetrate the ultraviolet, and the 254nm ultraviolet light generated by the ultraviolet lamp disinfects and sterilizes the water. Its characteristic is that the water flow rate is very fast, and the flow time in the quartz jacket is generally not more than 1 second, so the UV intensity of the germicidal lamp is required to be very high, and the surface intensity is generally required to exceed 30000 uw/cm2. To produce such high UV intensity, high intensity and high power UV germicidal lamp should be selected. If you still want to improve the disinfection effect by prolonging the time, you usually choose a longer lamp, make a longer device, or treat the outer wall into a vortex rotating structure to extend the time of water flow. The optimal surface temperature of the ultraviolet germicidal lamp is 40 ℃ when it works. Too high or too low temperature will affect the ultraviolet output effect.

Ultraviolet is easier to attenuate in water than in air, and its attenuation coefficient is much greater than that of visible light in water. The thickness of the water layer can only be allowed to be about 1cm. If it is thicker, more ultraviolet rays need to be wasted to achieve the same disinfection effect. That is, the application efficiency of ultraviolet lamp will be reduced. Problem collection: (First of all, the UV lamps used by the aquarium are all sealed, and you must not directly use the UV lamp to irradiate the fish tank!) 1: Won't using uv lamp to kill nitrifying bacteria in aquarium? No, the UV lamps used in the aquarium are all sealed, only the water flows through, killing only the bacteria carried in the water flow, while the digestive bacteria mainly grow on the filter material, with little impact. 2: Is it harmful to people, fish and grass when the aquarium uses the UV lamp? The penetration of ultraviolet rays is not as high as expected. Any paper, lead glass, or plastic will greatly reduce the exposure intensity. Therefore, the closed UV lamp is harmless to people, fish and grass. 3: UV is? Abbreviation for Ultraviolet rays.

Jiangsu Juguang Optoelectronic Technology Co., Ltd. has developed and produced a series of ultraviolet air disinfectors, plasma air disinfectors, mobile disinfectors, bed unit disinfectors, lamp racks and other products based on the core of ultraviolet disinfection lamps. With strong functions, multiple varieties and stable quality, they are used in hospitals, families, schools, government institutions and public places. The annual production and sales of air disinfectors reach more than 10000 sets. The company's products are in variety, output The quality has been continuously improved in many aspects, and is well received by users at home and abroad.