A ceramic glass vacuum electrodeless ultraviolet lamp

Abstract

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 to openings at both ends of the ceramic lamp tube to form a chamber, and a getter is located in the chamber. On the one hand, the electrodeless ultraviolet lamp of the present invention is not made of pure glass material, and the ceramic lamp tube and the glass tube together form the main structure of the chamber. Compared with the traditional electrodeless lamp in which the main structure of the chamber is formed by pure glass material, the setting 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 the inner wall of the ceramic lamp tube has a higher reflectivity than that of the glass tube, which will improve the light intensity of the electrodeless lamp.

Description

Technical Field

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

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

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

[0004] Due to its inherent principle, UV lamps stimulate vacuum ultraviolet light. A pure glass lamp body transmits approximately 80% of the UV light, but the light intensity transmitted through the window does not reach the ideal intensity, leaving significant room for improvement. Existing vacuum inorganic UV lamps consist of a glass lamp body, a fluoride window, and a getter within the glass body. The fluoride window is designed to transmit high levels of vacuum ultraviolet light and seal the glass body, while the getter absorbs any impurity gases that may be present within the lamp body. The glass lamp body corrodes and is damaged by UV light, causing a large release of gases within the glass body, severely impacting the UV lamp's signal. Consequently, most UV lamps have a short lifespan, especially small bulbs. Due to the low amount of rare gases (such as krypton) within, even a small amount of impurities can significantly affect the glow reaction, resulting in poor performance and lifespan, typically lasting only one 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 become ineffective 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 increases the service life of the ultraviolet lamp.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] 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 to the openings at both ends of the ceramic lamp tube to form a cavity. The getter is located in the cavity.

[0008] As a further improvement of the above technical solution:

[0009] The getter is stuck or bonded in the ceramic lamp tube.

[0010] 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.

[0011] The inner hole diameter of the clamping portion is smaller than the inner hole diameter of the lamp tube body, and the getter is clamped in the clamping portion.

[0012] The getter is in sheet form.

[0013] The getter is folded and clamped in the clamping portion.

[0014] The clamping portion 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.

[0015] The lamp tube body is sealed and connected to the glass tube through a sealing agent.

[0016] The window piece is a fluoride crystal disc.

[0017] The clamping portion and the lamp body are respectively in the shape of hollow cylinders, or the clamping portion is in the shape of a hollow truncated cone, and the lamp body is in the shape of a hollow cylinder.

[0018] The getter is stuck or bonded in the glass tube.

[0019] The ceramic lamp tube is made of metal oxide or forsterite.

[0020] Compared with the prior art, the advantages of the present invention are:

[0021] The present invention relates to a ceramic glass vacuum electrodeless ultraviolet lamp, in which a window piece and a glass tube are respectively sealed and connected to 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 traditional electrodeless lamp with the main structure of the chamber formed by pure glass material, the setting 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 improve the service life of the ultraviolet lamp. In addition, the inner wall of the ceramic lamp tube has a higher reflectivity than the glass tube, which will improve the light intensity of the electrodeless lamp. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural diagram of embodiment 1 of the present invention.

[0023] Figure 2 It is a structural schematic diagram of a ceramic lamp tube according to an embodiment of the present invention. Figure 2 (a) and Figure 2 (b) Different viewing directions respectively.

[0024] 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.

[0025] Figure 4 It is a structural diagram of embodiment 2 of the present invention.

[0026] Figure 5 It is an exploded schematic diagram of the structure of the molten glass tube after necking in Example 2 of the present invention.

[0027] The numbers in the figure represent:

[0028] 1. Glass tube; 2. Window piece; 3. Ceramic lamp tube; 31. Lamp tube body; 32. Clamping part; 4. Getter. DETAILED DESCRIPTION

[0029] The present invention will be described in further detail below. Unless otherwise specified, the instruments and materials used in the present invention are commercially available.

[0030] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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.

[0031] In the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," "fixed," etc. should be understood in a broad sense. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0032] Example 1

[0033] like Figures 1 to 3 As shown, the ceramic glass vacuum electrodeless UV lamp of this embodiment (the ceramic glass vacuum electrodeless UV lamp in this invention refers to the bulb and does not include other components such as the high-frequency generator and coupler) comprises a glass tube 1, a window 2, a ceramic lamp tube 3, and a getter 4. The ceramic lamp tube 3 is opaque and has openings at both ends (meaning that ultraviolet rays cannot pass through the side walls of the ceramic lamp tube 3). The window 2 and the glass tube 1 are 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. The electrodeless UV lamp of the present invention is not made of pure glass. Instead, the ceramic lamp tube 3 and the glass tube 1 together form the main structure of the chamber (the chamber is filled with a rare gas, eliminating the need for fluorescent material, and the interior of the ceramic lamp tube 3 can be polished to varying degrees as needed). Compared to traditional electrodeless lamps with a main structure formed of pure glass, the opaque ceramic lamp tube 3 of the present invention reduces the area of ​​the glass portion exposed to ultraviolet light, significantly reducing the amount of gas generated during operation and extending the service life of the UV lamp. In addition, the ceramic lamp tube has an inner wall with a higher reflectivity than the glass tube 1, which improves the light intensity of the electrodeless lamp.

[0034] The getter 4 is stuck or bonded in the ceramic lamp tube 3, which can prevent most of the getter 4 material from being irradiated by ultraviolet light without affecting the getter 4's air absorption, thereby reducing the probability of the getter 4 failing and increasing the service life of the ultraviolet lamp.

[0035] In this embodiment, the ceramic lamp 3 includes a lamp body 31 and a snap-fit ​​portion 32 at one end of the lamp body 31. The snap-fit ​​portion 32 is located near one side of the glass tube 1. The getter 4 is folded and securely snapped into the snap-fit ​​portion 32 with a certain degree of resilience. The getter 4 is located at the snap-fit ​​portion 32, away from the window 2, to prevent it from affecting the transmission of vacuum ultraviolet light through the window 2 and significantly reduce ultraviolet light exposure to the getter.

[0036] The inner diameter of the engaging portion 32 is smaller than that of the lamp body 31, and the getter 4 is locked in the engaging portion 32. The locking arrangement of the getter 4 not only facilitates the secure placement of the getter 4 and prevents it from moving around in the chamber, but also eliminates the need for additional parts to secure the getter 4 in this small-sized electrodeless lamp.

[0037] The getter 4 is in sheet form and can be more easily engaged in the engaging portion 32 after being folded.

[0038] The getter 4 is folded and locked in the locking portion 32. After being folded, the getter 4 has a certain degree of resilience and is fixed by the friction generated by the resilience and the inner wall of the locking portion 32. Generally, metal materials such as stainless steel and titanium are used as the base material of the getter.

[0039] The engaging portion 32 is embedded in the glass tube 1 . One end of the lamp body 31 is connected to the glass tube 1 , and the other end is connected to the window piece 2 .

[0040] In this embodiment, the ceramic lamp tube 3 also includes a frustum 33, which is located between the lamp tube body 31 and the engaging portion 32. The inner diameter of the frustum 33 is between the inner diameters of the engaging portion 32 and the inner diameter of the lamp tube body 31. The outer wall of the frustum 33 mates with the inner wall of the glass tube 1, and one end face of the lamp tube body 31 is sealed to one end face of the glass tube 1. Because the getter 4 is relatively small, the engaging portion 42 is also small to facilitate the engagement of the getter 4. When the glass tube 1 melts, it can be coated on the outer wall of the frustum 33. The frustum 33 can thus improve the sealing between the glass tube 1 and the ceramic lamp tube 3.

[0041] The lamp tube body 31 is sealed and connected to the glass tube 1 through a sealing agent.

[0042] Window 2 is a fluoride sheet with extremely short wavelength vacuum ultraviolet light (wavelength 100~200nm) and extremely high transmittance.

[0043] In this embodiment, the engaging portion 32 and the lamp body 31 are each hollow cylindrical. In other embodiments, the engaging portion 32 may be hollow truncated cone-shaped, and the lamp body 31 may be hollow cylindrical. This facilitates the connection between the glass tube 1 and the ceramic lamp tube 3.

[0044] The ceramic lamp tube 3 is a metal oxide or forsterite ceramic lamp tube 3, and its interior can be polished (depending on the light intensity requirements). In this embodiment, the ceramic is made of a metal oxide material (such as forsterite (2MgO·SiO2) ceramic or zirconium oxide) with an extremely dense and porous base. It has the same thermal expansion coefficient as fluoride crystals and remains essentially unchanged under ultraviolet light. After vacuum high-temperature degassing, the ceramic's outgassing rate is far superior to that of glass.

[0045] 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 inner wall of the ceramic (the reflectivity of the ceramic increases as the wavelength of the ultraviolet light decreases). At this time, except for a very small part at the locking portion 32 that can pass through, most of the other ultraviolet light will pass through the fluoride window through direct transmission or reflection, and the intensity of the ultraviolet light is greatly improved.

[0046] The glass tube 1 is a glass tube with a narrowed end (such as Figure 3 As shown, after the parts are assembled and rare gas is injected, flame fusion is performed at the constricted area. As the glass tube 1 fuses, the constricted area is sealed. After this sealing, the bottom of the bulb (the junction between the glass tube 1 and the ceramic tube 3) is continuously fused. The glass melts at high temperatures and shrinks in the vacuum chamber. Firing continues until the glass shrinks to the engagement portion 32 of the ceramic tube 3, where it bonds to the tube and seals the bulb. In the UV lamp, only a small portion of glass is present at the base of the bulb (at the exhaust duct). The rest of the glass is ceramic.

[0047] The present invention includes a ceramic lamp tube 3 and a glass tube 1. Compared with traditional pure glass tubes, which require an extra sealing layer, there is actually only one layer after the glass is sintered. Under the same sealing technology, the airtightness of the sealing part is unchanged compared with traditional light bulbs. 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 a single vacuum layer, the permeability is reduced to increase the service life.

[0048] Example 2

[0049] 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:

[0050] The ceramic lamp tube 3 of the present invention does not include the engaging portion 32, and the getter 4 is located within the glass tube 1 outside the ceramic lamp tube 3. This structure also reduces the area of ​​the glass tube 1 exposed to ultraviolet light, thereby reducing the amount of gas generated during operation. Furthermore, the ceramic lamp tube 3 has an inner wall with a higher reflectivity than the glass tube 1, which increases the illumination intensity of the electrodeless lamp and is not difficult to manufacture. Compared to the first embodiment, since the getter 4 is placed within the glass tube 1, to avoid affecting the getter 4, a small amount of glass cannot be used to seal the ceramic lamp tube 3 after melting when the glass tube 1 is molten.

[0051] 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 .

[0052] Although the present invention has been disclosed above with reference to preferred embodiments, this is not intended to limit the present invention. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, utilize the technical content disclosed above to make many possible changes and modifications to the technical solution of the present invention, or modify it into an equivalent embodiment with equivalent changes. Therefore, any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the scope of protection of the technical solution of the present invention.

Claims

1. A ceramic glass vacuum electrodeless ultraviolet lamp, characterized by: The invention comprises a glass tube (1), a window piece (2), a ceramic lamp tube (3) and an absorbent (4), wherein the ceramic lamp tube (3) is opaque and has openings at both ends, the window piece (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 absorbent (4) is located in the chamber; 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), the absorbent (4) is clamped or bonded in the clamping portion (32), and the inner wall of the ceramic lamp tube (3) has a higher reflectivity than that of the glass tube, which will increase the light intensity of the electrodeless lamp.

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 1, 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).

4. The ceramic glass vacuum electrodeless ultraviolet lamp according to claim 1, characterized in that: The getter (4) is folded and clamped in the clamping portion (32).

5. The ceramic glass vacuum electrodeless ultraviolet lamp according to claim 1, 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 piece (2).

6. The ceramic glass vacuum electrodeless ultraviolet lamp according to claim 1, 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.

7. 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).

8. The ceramic glass vacuum electrodeless ultraviolet lamp according to any one of claims 1 to 7, characterized in that: The window piece (2) is a fluoride crystal disc.

9. The ceramic glass vacuum electrodeless ultraviolet lamp according to any one of claims 1 to 7, characterized in that: The ceramic lamp tube (3) is a ceramic lamp tube (3) made of metal oxide or forsterite.

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