Double-coating ultraviolet lamp tube

Abstract

The utility model discloses a double-coating ultraviolet lamp tube, which comprises a tube body, a sealing piece and an electrode stem, and a metal coating and a ceramic coating are arranged at the position of the tube body corresponding to the front end of the electrode stem. According to the utility model, the metal coating has higher reflectivity, can reflect infrared radiation, and reduces heat loss; the ceramic coating forms a protective heat insulation layer, can protect volatilization of the metal coating at high temperature, reduces conduction of internal heat to the outside, reduces heat loss, has certain heat capacity, can absorb and store part of heat, delays the speed of temperature change, and keeps temperature stability of electrode parts at two ends of the lamp tube. The double coatings cooperate with each other and jointly play a role in heat preservation, the temperature stability of electrode parts at the two ends of the ultraviolet lamp tube is effectively improved, the starting speed of the ultraviolet lamp tube is increased, it is guaranteed that the ultraviolet lamp tube still keeps the voltage stability under the working condition of excessive ventilation and exhaust, and the ultraviolet lamp tube has excellent performance.

Description

Technical Field

[0001] The utility model relates to the technical field of light source equipment, in particular to a double-coated ultraviolet lamp tube. Background Art

[0002] Ultraviolet lamps are usually used in printing, disinfection, sterilization, curing and other fields. In some specific occasions, the working environment may need to take into account the environmental protection requirements of ozone emissions. Usually, in order to eliminate the potential impact of ozone generated by ultraviolet light on the environment and operators, the working environment of the ultraviolet lamp needs to be ventilated and exhausted.

[0003] However, this excessive ventilation may cause the temperature of the lamp end and the electrode to be too low, which will have an adverse effect on the performance and life of the UV lamp. Specifically, low temperature will affect the working gas pressure inside the lamp and the heating effect of the electrode, causing the light source output of the UV lamp to weaken and affecting its lighting performance; too low electrode temperature will also affect the electron emission efficiency, accelerate the oxidation and loss of the electrode surface, and thus shorten the service life of the UV lamp; in a low temperature environment, the voltage stability of the UV lamp may be affected, causing the device to automatically turn off the light or report an error.

[0004] Therefore, it is necessary to make improvements to improve the working performance and stability of UV lamps in excessive ventilation environments to ensure their normal operation and environmentally friendly use. Utility Model Content

[0005] In order to improve the working performance of the ultraviolet lamp tube under ventilation and exhaust conditions, the utility model provides a double-coated ultraviolet lamp tube.

[0006] The technical solution adopted by the utility model is as follows: a double-coated ultraviolet lamp tube, comprising: a tube body, which is composed of a straight tube section, a closing section and a sealing section from the center to both ends, and is filled with an inert gas; a sealing member, which is tightly sealed on the outside of the sealing section; an electrode rod, which is tightly sealed in the sealing member, and the end extends inward to the closing section; a metal coating and a ceramic coating, which are sequentially coated on the outer wall of the closing section.

[0007] Preferably, the metal coating and the ceramic coating cover the front end of the electrode rod in the axial direction.

[0008] Preferably, the width of the ceramic coating is greater than the width of the metal coating, and the ceramic coating completely covers the metal coating.

[0009] Preferably, the thickness of the metal coating is 0.001-0.01 mm.

[0010] Preferably, the thickness of the ceramic coating is 0.05-0.3 mm.

[0011] Preferably, the gaps between the sealing section, the sealing member and the electrode rod are sealed with glass powder to form a dense seal.

[0012] Preferably, the tube body is made of a quartz glass tube.

[0013] Preferably, the electrode rod is a tungsten rod, a tungsten alloy rod, a molybdenum rod or a molybdenum alloy rod.

[0014] The utility model has the following beneficial effects: the utility model is provided with a double coating of metal coating and ceramic coating at the position of the tube body corresponding to the front end of the electrode rod; the metal coating has a higher reflectivity, can reflect infrared radiation, and reduce heat loss; the ceramic coating forms a heat-insulating layer, protects the metal coating from volatilization at high temperature, and reduces the conduction of internal heat to the outside, reduces heat loss, and has a certain heat capacity, can absorb and store part of the heat, slow down the speed of temperature change, and maintain the stability of the temperature inside the tube body; the double coatings cooperate with each other to play a role of heat preservation, effectively improve the temperature stability of the electrode parts at both ends of the ultraviolet lamp tube, and ensure that the ultraviolet lamp tube has excellent performance under excessive ventilation and exhaust conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a cross-sectional schematic diagram of an embodiment of the utility model.

[0016] Figure 2 It is an enlarged schematic diagram of point A of an embodiment of the utility model.

[0017] Tube body 1, straight tube section 101, closing section 102, sealing section 103; sealing component 2; electrode rod 3; metal coating 4; ceramic coating 5; glass powder 6. DETAILED DESCRIPTION

[0018] The utility model is further described below in conjunction with the embodiments and drawings.

[0019] In the embodiment, Figure 1 , 2As shown, a double-coated ultraviolet lamp tube includes: a tube body 1, which is composed of a straight tube section 101, a closing section 102 and a sealing section 103 from the center to both ends, and is filled with an inert gas; a sealing member 2, which is tightly sealed on the outside of the sealing section 103; an electrode rod 3, which is tightly sealed in the sealing member 2, and the end extends inward to the closing section 102; a metal coating 4 and a ceramic coating 5, which are sequentially coated on the outer wall of the closing section 102. In this embodiment, a double coating of a metal coating 4 and a ceramic coating 5 is provided at the position of the tube body 1 corresponding to the front end of the electrode rod 3; the metal coating 4 has a high reflectivity, can reflect infrared radiation, and reduce heat loss; and the ceramic coating 5 forms a heat-insulating layer to protect the metal coating from volatilization at high temperature, and reduce the conduction of internal heat to the outside, reduce heat loss, and has a certain heat capacity, can absorb and store part of the heat, slow down the rate of temperature change, and maintain the stability of the internal temperature of the tube body 1; the double coatings work together to play a role in heat preservation, effectively improving the stability of the temperature of the electrode parts at both ends of the ultraviolet lamp tube, and ensuring that the ultraviolet lamp tube has excellent performance under excessive ventilation and exhaust conditions.

[0020] In the embodiment, Figure 1 , 2 As shown, the metal coating 4 and the ceramic coating 5 cover the front end of the electrode rod 3 in the axial direction. This structure can ensure the temperature of the front end of the electrode rod 3 and avoid

[0021] The phenomenon of reduced electron emission efficiency due to low electrode temperature ensures the luminous performance of the ultraviolet lamp.

[0022] In the embodiment, Figure 1 , 2 As shown, the width of the ceramic coating 5 is greater than the width of the gold coating 4, and the ceramic coating 5 completely covers the metal coating 4. In addition to heat insulation, the ceramic coating 5 also acts as a protective layer for the metal coating 4, preventing the expensive metal coating 4 from volatilizing and falling off, and ensuring the firmness and stability of the double coating.

[0023] In the embodiment, the gaps between the sealing section 103, the sealing member 2 and the electrode rod 3 are sealed with glass powder 6 to form a dense seal. Glass powder has good stable chemical properties and is resistant to high temperatures. The sealing effect of glass powder is better and more stable.

[0024] In the embodiment, the tube body 1 is made of a quartz glass tube, which has the advantages of high temperature resistance, corrosion resistance, good thermal stability, good light transmittance, good electrical insulation performance, etc., and is more suitable for ultraviolet light. The electrode rod 3 is a tungsten rod, a tungsten alloy rod, a molybdenum rod or a molybdenum alloy rod. Tungsten has the characteristics of high melting point, corrosion resistance, and excellent mechanical properties, and is suitable for use as an electrode material for ultraviolet lamps. Molybdenum has the characteristics of high melting point, corrosion resistance, good electrical conductivity and thermal conductivity, and is suitable for use in high temperature and high current environments. Tungsten, molybdenum or their alloys can be selected to make the electrode rod 3 according to different needs.

[0025] In the embodiment, the processing process of the metal coating 4 is as follows:

[0026] First, metal solution is prepared using raw materials such as gold, silver, rhodium, chromium, camphor oil, cyclohexanone, pine oil, rosin and resin;

[0027] Then, use a hot air gun to preheat the location to be applied, i.e. the closing section 102;

[0028] Next, use a brush to dip a proper amount of the metal solution and evenly apply it on the outside of the closing section 102;

[0029] Finally, high temperature baking is used to make the coating bright golden in color, and the thickness of the metal coating 4 is controlled within the range of 0.001-0.01 mm.

[0030] In the embodiment, the processing process of the ceramic coating 5 is as follows:

[0031] First, a ceramic solution is prepared using raw materials such as aluminum phosphate, aluminum silicate, mica and silicon;

[0032] Then, use a hot air gun to preheat the position to be sprayed, that is, the closing section 102;

[0033] Then, the ceramic solution is evenly sprayed on the outer surface of the completed metal coating 4 using a spray gun;

[0034] Finally, high temperature baking is used to control the thickness of the ceramic coating 5 to be within the range of 0.05-0.3 mm.

[0035] Obviously, the above embodiments of the present invention are only examples for explaining the present invention, and are not intended to limit the implementation methods of the present invention. Other obvious changes or modifications derived from the essence of the present invention still fall within the protection scope of the present invention.

Claims

1. A double-coated ultraviolet lamp tube, characterized in that: include: The tube body (1) comprises, from the center to the two ends, a straight tube section (101), a closing section (102) and a sealing section (103), and is filled with an inert gas; A sealing member (2) tightly sealed on the outside of the sealing section (103); An electrode rod (3) is tightly sealed in the sealing member (2), with its end extending inwardly to the closing section (102); The metal coating (4) and the ceramic coating (5) are sequentially coated on the outer wall of the closing section (102).

2. The double-coated ultraviolet lamp tube according to claim 1, characterized in that: The metal coating (4) and the ceramic coating (5) cover the front end of the electrode rod (3) in the axial direction.

3. The double-coated ultraviolet lamp tube according to claim 1, characterized in that: The width of the ceramic coating (5) is greater than the width of the metal coating (4), and the ceramic coating (5) completely covers the metal coating (4).

4. The double-coated ultraviolet lamp tube according to claim 1, characterized in that: The thickness of the metal coating (4) is 0.001-0.01 mm.

5. The double-coated ultraviolet lamp tube according to claim 1, characterized in that: The thickness of the ceramic coating (5) is 0.05-0.3 mm.

6. The double-coated ultraviolet lamp tube according to claim 1, characterized in that: The gap between the sealing section (103), the sealing member (2) and the electrode rod (3) is sealed with glass powder (6) to form a dense seal.

7. The double-coated ultraviolet lamp tube according to claim 1, characterized in that: The tube body (1) is made of a quartz glass tube.

8. The double-coated ultraviolet lamp tube according to claim 1, characterized in that: The electrode rod (3) is a tungsten rod, a tungsten alloy rod, a molybdenum rod or a molybdenum alloy rod.

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