Ceramic glass vacuum electrodeless ultraviolet lamp

Abstract

The invention discloses a ceramic glass vacuum electrodeless ultraviolet lamp, a window sheet and a glass tube are respectively connected with openings at two ends of a ceramic lamp tube in a sealing manner to form a cavity, and a getter is located in the cavity, on one hand, the electrodeless ultraviolet lamp is not made of pure glass materials, and is a main body structure of the cavity formed by the ceramic lamp tube and the glass tube together, and on the other hand, the glass tube is not made of pure glass materials; compared with a traditional electrodeless lamp with a main body structure of a cavity formed by pure glass materials, the non-transparent ceramic lamp tube is arranged, the area of the glass part irradiated by ultraviolet light is reduced, the amount of gas generated in the working period is greatly reduced, the inner wall of the ceramic lamp tube is provided with the inner wall with higher reflectivity than that of the glass tube, and the illumination intensity of the electrodeless lamp is improved.

Description

Technical Field

[0001] The invention relates to the technical field of vacuum electrodeless lamps, and in particular to a ceramic glass vacuum electrodeless ultraviolet lamp. Background Art

[0002] In the prior art, most vacuum electrodeless ultraviolet lamps are manufactured by using a pure glass lamp body to seal a fluoride window, using a high vacuum system to exhaust and fill with rare gas, and finally manually sintering the glass to form a bulb. Therefore, most manufacturers use pure glass as the material.

[0003] The principle of ultraviolet photoionization technology is: using radio frequency electric field to stimulate a vacuum electrodeless ultraviolet lamp to emit vacuum ultraviolet light (wavelength 100~200nm). High-energy vacuum ultraviolet light can ionize VOC gas molecules. The ionized gas molecules will form ions. Electrode plates specially used to collect ions are used to collect ions and then introduce them into the circuit to form a current signal. After a series of circuit processing, the current signal is input into a voltage signal related to the VOC concentration, thus forming a relationship between the voltage signal and the VOC concentration signal. Using this relationship, the gas concentration of VOC can be measured. The most critical core technology is the vacuum electrodeless ultraviolet lamp.

[0004] Due to the influence of its own principle, the ultraviolet lamp will excite vacuum ultraviolet light. The pure glass lamp body will transmit about 80% of the ultraviolet light, and the light intensity transmitted from the window cannot reach the ideal light intensity, which has a large room for improvement. The existing vacuum inorganic ultraviolet lamp includes a glass lamp body, a fluoride window and a getter located in the glass lamp body. The fluoride window is used to highly transmit vacuum ultraviolet light and seal the glass lamp body. The getter is used to absorb impurity gases that may exist in the lamp body. The glass lamp body will be corroded and damaged when exposed to ultraviolet light, resulting in a large amount of gas released from the glass lamp body, which seriously affects the signal of the ultraviolet lamp. Therefore, the life of most ultraviolet lamps is relatively low, especially small bulbs. Due to the small amount of rare gas (such as krypton) inside, a small amount of impurities will have a great impact on the glow reaction, and the performance life is poor, generally 1 year. On the other hand, the getter in the UV lamp is placed on the inner wall of the glass tube. The transparent glass tube allows ultraviolet light to pass through, resulting in a lower light intensity passing through the fluoride window. After the getter is exposed to ultraviolet light for a long time, the getter will fail or the getter material will sublime and condense on the fluoride window, resulting in reduced performance of the UV lamp and shortened service life of the UV lamp. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a ceramic glass vacuum electrodeless ultraviolet lamp which can prolong the service life of the ultraviolet lamp.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions: A ceramic glass vacuum electrodeless ultraviolet lamp comprises a glass tube, a window piece, a ceramic lamp tube and a getter. The ceramic lamp tube is opaque and has openings at both ends. The window piece and the glass tube are respectively sealed and connected with the openings at both ends of the ceramic lamp tube to form a chamber. The getter is located in the chamber.

[0007] As a further improvement of the above technical solution: The getter is stuck or bonded in the ceramic lamp tube.

[0008] The ceramic lamp tube comprises a lamp tube body and a clamping portion located at one end of the lamp tube body, the clamping portion is arranged close to one side of the glass tube, and the getter is clamped or bonded in the clamping portion.

[0009] The inner hole diameter of the clamping part is smaller than the inner hole diameter of the lamp tube body, and the getter is clamped in the clamping part.

[0010] The getter is in the form of a sheet.

[0011] The getter is folded and clamped in the clamping part.

[0012] The clamping part is embedded in the glass tube, one end of the lamp tube body is connected to the glass tube, and the other end is connected to the window piece.

[0013] The lamp tube body is sealed and connected to the glass tube via a sealing agent.

[0014] The window piece is a fluoride crystal disc.

[0015] The clamping part and the lamp body are respectively in the shape of hollow cylinders, or the clamping part is in the shape of a hollow truncated cone, and the lamp body is in the shape of a hollow cylinder.

[0016] The getter is stuck or bonded in the glass tube.

[0017] The ceramic lamp tube is a ceramic lamp tube made of metal oxide or forsterite.

[0018] Compared with the prior art, the advantages of the present invention are: The present invention discloses a ceramic glass vacuum electrodeless ultraviolet lamp, in which a window piece and a glass tube are respectively sealed and connected with openings at both ends of the ceramic lamp tube to form a chamber, and a getter is fixed in the chamber. On the one hand, the electrodeless ultraviolet lamp of the present invention is not made of pure glass material, but the ceramic lamp tube and the glass tube together form the main structure of the chamber. Compared with the electrodeless lamp with the main structure of the chamber formed by traditional pure glass material, the arrangement of the opaque ceramic lamp tube reduces the area of ​​the glass part irradiated by ultraviolet light, which will greatly reduce the amount of gas generated during operation and increase the service life of the ultraviolet lamp, and the inner wall of the ceramic lamp tube has a higher reflectivity than the glass tube, which will increase the illumination intensity of the electrodeless lamp. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural diagram of embodiment 1 of the present invention.

[0020] Figure 2 It is a schematic structural diagram of a ceramic lamp tube according to a first embodiment of the present invention. Figure 2 (a) and Figure 2 (b) Different viewing directions respectively.

[0021] Figure 3 It is an exploded schematic diagram of the structure of a molten glass tube before shrinkage in Example 1 of the present invention.

[0022] Figure 4 It is a structural diagram of embodiment 2 of the present invention.

[0023] Figure 5 It is an exploded schematic diagram of the structure of the molten glass tube after shrinkage in Example 2 of the present invention.

[0024] The symbols in the figure represent: 1. Glass tube; 2. Window piece; 3. Ceramic lamp tube; 31. Lamp tube body; 32. Clamping part; 4. Getter. DETAILED DESCRIPTION

[0025] The present invention will be described in further detail below. Unless otherwise specified, the instruments or materials used in the present invention are commercially available.

[0026] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “top”, “bottom”, “inside” and “outside” are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0027] In the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] Embodiment 1 like Figures 1 to 3As shown, the ceramic glass vacuum electrodeless ultraviolet lamp of this embodiment (the ceramic glass vacuum electrodeless ultraviolet lamp in the present invention refers to the bulb, and does not involve other parts such as high-frequency generators and couplers) includes a glass tube 1, a window piece 2, a ceramic lamp tube 3 and a getter 4. The ceramic lamp tube 3 is opaque and has openings at both ends (referring to the side wall of the ceramic lamp tube 3 that ultraviolet rays cannot penetrate), the window piece 2 and the glass tube 1 are respectively sealed and connected with the openings at both ends of the ceramic lamp tube 3 to form a chamber, and the getter 4 is located in the chamber. The electrodeless ultraviolet lamp of the present invention is not made of pure glass material, but the ceramic lamp tube 3 and the glass tube 1 together form a main structure of the chamber (the chamber is filled with rare gas, and there is no need to set fluorescent materials, and the inside of the ceramic lamp tube 3 can be polished to different degrees as needed). Compared with the electrodeless lamp with a main structure of the chamber formed by traditional pure glass material, the setting of the opaque ceramic lamp tube 3 of the present invention reduces the area of ​​the glass part irradiated by ultraviolet light, which will greatly reduce the amount of gas generated during operation, and improve the service life of the ultraviolet lamp, and the ceramic lamp tube has an inner wall with a higher reflectivity than the glass tube 1, which will improve the illumination intensity of the electrodeless lamp.

[0029] The getter 4 is stuck or bonded in the ceramic lamp tube 3, which can prevent most of the getter 4 materials from being irradiated by ultraviolet light without affecting the getter 4's air intake, thereby reducing the probability of the getter 4 failing and increasing the service life of the ultraviolet lamp.

[0030] In this embodiment, the ceramic lamp tube 3 includes a lamp tube body 31 and a clamping portion 32 located at one end of the lamp tube body 31, the clamping portion 32 is arranged close to one side of the glass tube 1, and the getter 4 is fixedly clamped in the clamping portion 32 by folding with a certain resilience. The getter 4 is located at the clamping portion 32 away from the window sheet 2, so as to avoid the getter 4 affecting the vacuum ultraviolet light transmittance at the window sheet 2 and greatly reduce the irradiation of the ultraviolet light on the getter.

[0031] The inner diameter of the clamping part 32 is smaller than the inner diameter of the lamp body 31, and the getter 4 is clamped in the clamping part 32. The getter 4 is arranged by clamping, which is convenient for fixing the getter 4 and preventing the getter 4 from moving freely in the chamber. On the other hand, for this small-sized electrodeless lamp, there is no extra space to add additional parts to fix the getter 4.

[0032] The getter 4 is in sheet form and can be more easily engaged in the engaging portion 32 after being folded.

[0033] The getter 4 is folded and clamped in the clamping part 32. After being folded, the getter 4 has a certain rebound, and is fixed by the rebound and the friction generated by the inner wall of the clamping part 32. Generally, metal materials such as stainless steel and titanium are used as the base material of the getter.

[0034] The engaging portion 32 is embedded in the glass tube 1 . One end of the lamp tube body 31 is connected to the glass tube 1 , and the other end is connected to the window piece 2 .

[0035] In this embodiment, the ceramic lamp tube 3 further includes a truncated cone portion 33, which is located between the lamp tube body 31 and the clamping portion 32, and the inner diameter of the truncated cone portion 33 is between the inner diameter of the clamping portion 32 and the inner diameter of the lamp tube body 31. The outer wall of the truncated cone portion 33 cooperates with the inner wall of the glass tube 1, and one end face of the lamp tube body 31 is sealed and connected with one end face of the glass tube 1. Since the getter 4 is small in size, the clamping portion 42 is not large in size to facilitate the clamping of the getter 4. When the glass tube 1 is melted, it can be covered on the outer wall of the truncated cone portion 33. The truncated cone portion 33 can make the sealing between the glass tube 1 and the ceramic lamp tube 3 better.

[0036] The lamp tube body 31 is sealed and connected to the glass tube 1 through a sealing agent.

[0037] Window 2 is a fluoride sheet with extremely short wavelength vacuum ultraviolet light (wavelength 100~200nm) and extremely high transmittance.

[0038] In this embodiment, the clamping portion 32 and the lamp body 31 are hollow cylindrical shapes. In other embodiments, the clamping portion 32 may be hollow truncated cone shaped, and the lamp body 31 may be hollow cylindrical. In this way, the glass tube 1 and the ceramic lamp tube 3 can be easily connected.

[0039] The ceramic lamp tube 3 is a metal oxide or forsterite ceramic lamp tube 3, and the inside can be polished (according to the light intensity requirements). In this embodiment, the ceramic is made of a metal oxide material with an extremely good density and porosity base (such as forsterite (2MgO·SiO2) ceramic, zirconium oxide), and has the same thermal expansion coefficient as fluoride crystals, and basically does not change under the irradiation of ultraviolet light. After the ceramic is vacuum-degassed at high temperature, the degassing rate of the ceramic is much better than that of the glass material.

[0040] The ceramic inside the ceramic lamp tube 3 is made of a material with strong ultraviolet light reflectivity, and the inside of the ceramic is polished. When the ultraviolet lamp is working to excite vacuum ultraviolet light, most of the ultraviolet light is reflected by the polished ceramic inner wall (the ceramic reflectivity increases with the decrease of the ultraviolet light wavelength). At this time, except for a very small part at the locking portion 32 that can be transmitted, most of the other ultraviolet light will be transmitted directly or reflected from the fluoride window, and the intensity of the ultraviolet light is greatly improved.

[0041] The glass tube 1 is a glass tube with a narrowed end (such as Figure 3As shown in the figure, after the parts are assembled and filled with rare gas, flame melting is performed at the necking; when the glass tube 1 is melted, the necking is melted and sealed; after melting and sealing, the bottom of the bulb (referring to the connection between the glass tube 1 and the ceramic lamp tube 3) is continuously melted, and the glass melts at high temperature and shrinks under the condition of internal vacuum and external air. The melting is continued until the glass shrinks to the clamping part 32 of the ceramic lamp tube 3 and is bonded to the ceramic lamp tube 3, and finally the sealing is completed. In fact, only a very small part of the glass is at the bottom clamping part 32 (exhaust pipe) of the ultraviolet lamp, and the rest is ceramic material.

[0042] The present invention includes a ceramic lamp tube 3 and a glass tube 1. Compared with the traditional pure glass tube, it needs one more sealing layer. After the glass is sintered, there is actually only one layer. Under the same sealing technology, the airtightness of the sealing part is unchanged compared with the traditional light bulb. The ultraviolet lamp has an additional double vacuum layer at the bottom (the ceramic lamp tube 3 is filled with rare gas, and the glass tube 1 is also filled with rare gas). Compared with the single-layer vacuum, the permeability is reduced to increase the service life.

[0043] Embodiment 2 like Figure 4 and Figure 5 As shown, the ceramic glass vacuum electrodeless ultraviolet lamp of the first embodiment is substantially the same as that of the second embodiment, except that: The ceramic lamp tube 3 of the present invention does not include the clamping portion 32, and the getter 4 is located in the glass tube 1 outside the ceramic lamp tube 3. This structure can also reduce the area of ​​the glass tube 1 irradiated by ultraviolet light, reduce the amount of gas generated during operation, and the ceramic lamp tube 3 has an inner wall with a higher reflectivity than the glass tube 1, which will increase the illumination intensity of the electrodeless lamp, and is not difficult to manufacture. Compared with the first embodiment, since the getter 4 is placed in the glass tube 1, in order to avoid affecting the getter 4, when the glass tube 1 is melted, a small amount of glass cannot be used to seal the ceramic lamp tube 3 after melting.

[0044] Specifically, the getter 4 is stuck or bonded to the inner wall of the glass tube 1 . In this embodiment, the getter 4 is in a curled or ring shape, has a certain resilience, and is stuck in the glass tube 1 .

[0045] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any technician familiar with the art can make many possible changes and modifications to the technical solution of the present invention by using the technical content disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention should fall within the scope of protection of the technical solution of the present invention.

Claims

1. A ceramic glass vacuum electrodeless ultraviolet lamp, characterized in that: The invention comprises a glass tube (1), a window sheet (2), a ceramic lamp tube (3) and a getter (4); the ceramic lamp tube (3) is opaque and has openings at both ends; the window sheet (2) and the glass tube (1) are respectively sealed and connected to the openings at both ends of the ceramic lamp tube (3) to form a chamber; and the getter (4) is located in the chamber.

2. The ceramic glass vacuum electrodeless ultraviolet lamp according to claim 1, characterized in that: The getter (4) is stuck or bonded inside the ceramic lamp tube (3).

3. The ceramic glass vacuum electrodeless ultraviolet lamp according to claim 2, characterized in that: The ceramic lamp tube (3) comprises a lamp tube body (31) and a clamping portion (32) located at one end of the lamp tube body (31); the clamping portion (32) is arranged close to one side of the glass tube (1); and the getter (4) is clamped or bonded in the clamping portion (32).

4. The ceramic glass vacuum electrodeless ultraviolet lamp according to claim 3, characterized in that: The inner hole diameter of the clamping portion (32) is smaller than the inner hole diameter of the lamp tube body (31), and the getter (4) is clamped in the clamping portion (32).

5. The ceramic glass vacuum electrodeless ultraviolet lamp according to claim 3, characterized in that: The getter (4) is folded and clamped in the clamping portion (32).

6. The ceramic glass vacuum electrodeless ultraviolet lamp according to claim 3, characterized in that: The clamping portion (32) is embedded in the glass tube (1); one end of the lamp tube body (31) is connected to the glass tube (1), and the other end is connected to the window sheet (2).

7. The ceramic glass vacuum electrodeless ultraviolet lamp according to claim 3, characterized in that: The clamping portion (32) and the lamp tube body (31) are respectively in the shape of a hollow cylinder; or the clamping portion (32) is in the shape of a hollow truncated cone, and the lamp tube body (31) is in the shape of a hollow cylinder.

8. The ceramic glass vacuum electrodeless ultraviolet lamp according to claim 1, characterized in that: The getter (4) is stuck or bonded inside the glass tube (1).

9. The ceramic glass vacuum electrodeless ultraviolet lamp according to any one of claims 1 to 8, characterized in that: The window piece (2) is a fluoride crystal disc.

10. The ceramic glass vacuum electrodeless ultraviolet lamp according to any one of claims 1 to 8, characterized in that: The ceramic lamp tube (3) is a ceramic lamp tube (3) made of metal oxide or forsterite.

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