CN116705588A - Ultraviolet lamp and gas sensor - Google Patents

Ultraviolet lamp and gas sensor Download PDF

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Publication number
CN116705588A
CN116705588A CN202210173484.4A CN202210173484A CN116705588A CN 116705588 A CN116705588 A CN 116705588A CN 202210173484 A CN202210173484 A CN 202210173484A CN 116705588 A CN116705588 A CN 116705588A
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China
Prior art keywords
ultraviolet
ultraviolet light
output window
bifurcation
cavity
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CN202210173484.4A
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Chinese (zh)
Inventor
苏爱民
陈冰
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Shanghai Genkuai Technology Co ltd
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Shanghai Genkuai Technology Co ltd
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Priority to CN202210173484.4A priority Critical patent/CN116705588A/en
Publication of CN116705588A publication Critical patent/CN116705588A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/54—Igniting arrangements, e.g. promoting ionisation for starting
    • H01J61/545—Igniting arrangements, e.g. promoting ionisation for starting using an auxiliary electrode inside the vessel
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/62—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode
    • G01N27/64—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode using wave or particle radiation to ionise a gas, e.g. in an ionisation chamber
    • G01N27/66—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode using wave or particle radiation to ionise a gas, e.g. in an ionisation chamber and measuring current or voltage
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
    • G01N30/02—Column chromatography
    • G01N30/62—Detectors specially adapted therefor
    • G01N30/64—Electrical detectors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/025—Associated optical elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/24—Means for obtaining or maintaining the desired pressure within the vessel
    • H01J61/26—Means for absorbing or adsorbing gas, e.g. by gettering; Means for preventing blackening of the envelope
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J65/00—Lamps without any electrode inside the vessel; Lamps with at least one main electrode outside the vessel
    • H01J65/04—Lamps in which a gas filling is excited to luminesce by an external electromagnetic field or by external corpuscular radiation, e.g. for indicating plasma display panels
    • H01J65/042—Lamps in which a gas filling is excited to luminesce by an external electromagnetic field or by external corpuscular radiation, e.g. for indicating plasma display panels by an external electromagnetic field
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
    • G01N30/02—Column chromatography
    • G01N30/62—Detectors specially adapted therefor
    • G01N30/64—Electrical detectors
    • G01N2030/642—Electrical detectors photoionisation detectors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Pathology (AREA)
  • Engineering & Computer Science (AREA)
  • Immunology (AREA)
  • Plasma & Fusion (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • Electromagnetism (AREA)
  • Electrochemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Toxicology (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)

Abstract

The application provides an ultraviolet lamp, which comprises a glass lamp tube, an ultraviolet light output window and a metal bracket made of non-evaporable active metal, wherein the ultraviolet light output window is in sealing connection with one end of the glass lamp tube, the metal bracket is positioned in the glass lamp tube and comprises a first bifurcation and a second bifurcation which have elasticity, one ends of the first bifurcation and the second bifurcation are connected, and the other ends of the first bifurcation and the second bifurcation extend along the direction deviating from the ultraviolet light output window and are respectively contacted with different surfaces of the glass lamp tube. According to the application, the metal bracket with the bifurcation structure is additionally arranged in the glass lamp tube, so that a part of barrier charges generated by electrostatic action can be conducted, the working gas is broken down in advance under relatively low external excitation voltage, the collision probability among molecules of the working gas is improved, the working gas is more easily excited, the excitation voltage is reduced, most of impurity gases except inert working gas can be absorbed, the ultraviolet lamp is in a stable working state for a long time, and the device performance and the service life are improved.

Description

Ultraviolet lamp and gas sensor
Technical Field
The application relates to the technical field of gas detection, in particular to an ultraviolet lamp and a gas sensor.
Background
The gas sensor including PID (Photo Ionization Detectors, photoionization detector) sensor is internally provided with a high-voltage module for driving an ultraviolet lamp, the ultraviolet lamp and a detection module for detecting the concentration of gas, high-voltage alternating current generated by the high-voltage module is applied to a pair of metal electrodes outside the ultraviolet lamp glass lamp tube, an electric field formed between the metal electrodes acts on working gas inside the lamp tube to enable the working gas to break down and emit ultraviolet rays, the ultraviolet rays pass through an output window on the ultraviolet lamp, the detected gas is ionized, the ionized gas can be detected in a current mode when passing through the detection module, and the concentration value of the detected gas is obtained through conversion.
The vacuum ultraviolet lamp is mainly applied to a photo-ion detection sensor such as PID, GC (gas chromatography) and the like. The PID sensor is used as a professional sensor for detecting VOC (Volatile Organic Compounds ) in the fields of environmental protection and industrial safety, has the advantages of small volume, high response speed, high precision, continuous measurement and the like, and can detect VOC and other toxic and harmful gases from extremely low concentration of 1ppb to higher concentration of tens of thousands of ppm. Currently, PID sensors are widely used in detection of various organic chemicals, and particularly play an important role in disaster area accident leakage detection, accident area confirmation, leakage confirmation and the like. The performance and lifetime of the vacuum ultraviolet lamp have been the key factors in determining the quality of the PID sensor. Improving the performance and lifetime of ultraviolet lamps is also a continuing effort by PID sensor developers. In the prior art, the method for prolonging the service life of the gas sensor mainly changes the output light intensity by changing the driving voltage of the ultraviolet lamp so as to prolong the service life of parts around the ultraviolet lamp, but the ultraviolet lamp can not work normally and has limited adjustment range. In this regard, the inventors of the present application have made long-term studies and have proposed an improvement.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, an object of the present application is to provide an ultraviolet lamp and a gas sensor, which are used for solving the problems of the prior art that the service life of the components around the ultraviolet lamp is prolonged by changing the output light intensity by changing the driving voltage of the ultraviolet lamp, and thus the service life of the gas sensor is prolonged, which may cause the ultraviolet lamp to fail to work normally, and the adjustment range is limited.
To achieve the above and other related objects, the present application provides an ultraviolet lamp comprising a glass lamp tube, an ultraviolet light output window and a metal bracket made of a non-evaporable active metal, wherein the ultraviolet light output window is hermetically connected with one end of the glass lamp tube, the metal bracket is positioned in the glass lamp tube, the metal bracket comprises a first bifurcation and a second bifurcation having elasticity, one ends of the first bifurcation and the second bifurcation are connected, and the other ends extend in a direction away from the ultraviolet light output window and are respectively contacted with different surfaces of the glass lamp tube.
Optionally, the glass fluorescent tube includes interconnect's first cavity and second cavity, and the internal diameter of first cavity is greater than the internal diameter of second cavity, the ultraviolet light output window with the one end that first cavity deviates from the second cavity is connected, the metal support is located first cavity, and first bifurcation and second bifurcation extend to be adjacent with the junction surface of first cavity and second cavity.
Optionally, the connection surface of the first cavity and the second cavity is a conical surface, and the glass lamp tube and the ultraviolet light output window are hermetically connected through a sealing material.
Optionally, the material of the metal bracket comprises one or two of vanadium and vanadium alloy.
Optionally, the metal stent further comprises a third bifurcation and a fourth bifurcation having elasticity, the first bifurcation, the second bifurcation, the third bifurcation, and the fourth bifurcation are connected, and the third bifurcation and the fourth bifurcation extend in a direction away from the first bifurcation and the second bifurcation to contact with the ultraviolet light output window.
Optionally, the ultraviolet lamp further includes an ultraviolet light attenuation sheet made of a material incapable of transmitting ultraviolet light, the ultraviolet light attenuation sheet is located in the glass lamp tube and adjacent to the ultraviolet light output window, the metal support is abutted to one end of the ultraviolet light attenuation sheet, which is away from the ultraviolet light output window, a plurality of transmission holes are formed in the ultraviolet light attenuation sheet, and the total transmission area of the plurality of transmission holes is smaller than the transmission area of the ultraviolet light output window.
In an alternative scheme, the ultraviolet lamp further comprises an ultraviolet light filter, the ultraviolet light filter is located in the glass lamp tube and adjacent to the ultraviolet light output window, the metal support is abutted to one end of the ultraviolet light filter, which is away from the ultraviolet light output window, and ultraviolet light transmission capacity of the ultraviolet light filter is smaller than that of the ultraviolet light output window.
In another alternative, the ultraviolet lamp further comprises an ultraviolet filter, the ultraviolet filter and the ultraviolet attenuation sheet are stacked and then adjacent to the ultraviolet output window, and the ultraviolet transmission capacity of the ultraviolet filter is smaller than that of the ultraviolet output window.
Optionally, the material of the ultraviolet light output window comprises magnesium fluoride crystal, and the material of the ultraviolet light filter comprises one or two of calcium fluoride crystal and aluminum oxide crystal.
The application also provides a gas sensor comprising an ultraviolet lamp as described in any one of the above aspects.
As described above, the ultraviolet lamp and the gas sensor of the application have the following beneficial effects: the application creatively adds the metal bracket with the bifurcation structure in the glass lamp tube, the shaped metal bracket can be put into the glass lamp tube from the opening at the tail part of the glass lamp tube in the manufacturing process of the ultraviolet lamp, after being put into the glass lamp tube, the bifurcation part can be automatically opened under the action of elastic force and is automatically fixed in the glass lamp tube, equipment damage caused by sliding out of the tail part of the lamp tube in the subsequent manufacturing process can be avoided, on one hand, the metal bracket can conduct a part of barrier charge generated by electrostatic action, so that working gas is broken down in advance under relatively lower external excitation voltage, the lighting voltage of the ultraviolet lamp can be reduced, namely the ultraviolet lamp is easier to light, and the power consumption is less; on the other hand, the metal bracket is made of a metal material with relatively high secondary electron emission coefficient, so that a large amount of electrons can overflow from the surface of the material under the action of an external electric field and micro electrons, the collision probability among molecules of working gas is greatly improved, the working gas is more easily excited, and the excitation voltage is further reduced; in addition, the non-evaporable active metal selected for the metal bracket has stronger ion bombardment resistance, when the ultraviolet lamp is in a normal working state, the sputtering effect of plasma in the lamp tube on the ultraviolet lamp is relatively weaker, the evaporation rate of atoms on the surface of a metal material can be effectively reduced, the surface of the metal bracket has stronger metal activity after being bombarded by the plasma for a long time, most of impurity gases except inert working gas can be absorbed, and the ultraviolet lamp can be in a stable working state for a long time. Therefore, the service performance and the service life of the ultraviolet lamp provided by the application can be obviously improved, and the ultraviolet lamp is applied to the photo-ion gas sensor such as the PID sensor, thereby being beneficial to improving the performance and the service life of the gas sensor.
Drawings
Fig. 1 is a schematic structural diagram of a glass lamp tube of an ultraviolet lamp according to an embodiment of the application.
Fig. 2 is a schematic structural diagram of a metal bracket of an ultraviolet lamp according to an embodiment of the application.
Fig. 3 and 4 are schematic views illustrating an assembly process of an ultraviolet lamp according to a first embodiment of the application.
Fig. 5 is a schematic structural diagram of a metal bracket of an ultraviolet lamp according to a second embodiment of the application.
Fig. 6 is a schematic structural diagram of an ultraviolet light attenuation sheet of an ultraviolet lamp according to a third embodiment of the present application.
Fig. 7 to 9 are schematic views illustrating an assembling process of an ultraviolet lamp according to a third embodiment of the application.
Detailed Description
Other advantages and effects of the present application will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present application with reference to specific examples. The application may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present application. As described in detail in the embodiments of the present application, the cross-sectional view of the device structure is not partially enlarged to a general scale for convenience of explanation, and the schematic drawings are only examples, which should not limit the scope of the present application. In addition, the three-dimensional dimensions of length, width and depth should be included in actual fabrication.
For ease of description, spatially relative terms such as "under", "below", "beneath", "above", "upper" and the like may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that these spatially relative terms are intended to encompass other orientations of the device in use or operation in addition to the orientation depicted in the figures. Furthermore, when a layer is referred to as being "between" two layers, it can be the only layer between the two layers or one or more intervening layers may also be present.
In the context of the present application, a structure described as a first feature being "on" a second feature may include embodiments where the first and second features are formed in direct contact, as well as embodiments where additional features are formed between the first and second features, such that the first and second features may not be in direct contact.
It should be noted that, the illustrations provided in the present embodiment merely illustrate the basic concept of the present application by way of illustration, and only the components related to the present application are shown in the drawings and are not drawn according to the number, shape and size of the components in actual implementation, and the form, number and proportion of the components in actual implementation may be arbitrarily changed, and the layout of the components may be more complex. In order to make the illustration as concise as possible, not all structures are labeled in the drawings.
Please refer to fig. 1 to 9.
Example 1
As shown in fig. 1 to 4, the present application provides an ultraviolet lamp comprising a glass lamp tube 1, an ultraviolet light output window 2, and a metal bracket 3 made of a non-evaporable active metal, wherein the ultraviolet light output window 2 is hermetically connected with one end of the glass lamp tube 1 (or can also be described as closing the opening of the glass lamp tube 1 by the ultraviolet light output window 2) to form a vacuum closed space, and the closed space is generally filled with an inert gas as a working gas 5, and ultraviolet radiation with different energy values can be excited by selecting different working gases, thereby being capable of being used for ionizing and detecting different kinds of gases; the metal bracket 3 is located in the glass lamp tube 1, the metal bracket 3 comprises a first bifurcation 32 and a second bifurcation 33 which have elasticity, one end of the first bifurcation 32 and one end of the second bifurcation 33 are connected to form a joint part 31, the joint part 31 can be contacted with the ultraviolet light output window 2 or is abutted against the ultraviolet light output window 2, the other ends of the two parts extend along the direction away from the ultraviolet light output window 2 and are respectively contacted with different surfaces of the glass lamp tube 1, and preferably, the first bifurcation 32 and the second bifurcation 33 are distributed opposite to each other along the axial center line of the glass lamp tube 1; the first and second prongs 32 and 33 are elastically folded by an external force, and are restored to their original shapes after the external force is released. The existing ultraviolet lamp is internally provided with no metal bracket, and the excitation voltage of the ultraviolet lamp is relatively high, because when the electrodeless ultraviolet lamp is excited by a high-voltage electric field outside the lamp tube, a large amount of barrier charges can be induced on the inner wall of the lamp tube due to electrostatic action, and the barrier charges can form a reverse high-voltage electric field inside to break down working gas so that the lamp bulb emits light; the inventor of the application creatively adds a metal bracket with a bifurcation structure in the glass lamp tube through a great deal of creative labor, the metal bracket with the shape can be put into the glass lamp tube from an opening at the tail part of the glass lamp tube in the manufacturing process of the ultraviolet lamp, after the metal bracket is put into the glass lamp tube, the bifurcation part can be automatically opened under the action of elastic force, and the metal bracket is automatically fixed in the glass lamp tube, so that equipment is prevented from being damaged due to the fact that the metal bracket slides out from the tail part of the lamp tube in the subsequent manufacturing process, on one hand, a part of barrier charge generated by electrostatic effect can be conducted by the metal bracket, so that working gas is broken down in advance under relatively lower external excitation voltage, the lighting voltage of the ultraviolet lamp can be reduced, namely the ultraviolet lamp is easier to light, and the power consumption is less; on the other hand, the metal bracket is made of a metal material with relatively high secondary electron emission coefficient, so that a large amount of electrons can overflow from the surface of the material under the action of an external electric field and micro electrons, the collision probability among molecules of working gas is greatly improved, the working gas is more easily excited, and the excitation voltage is further reduced; in addition, the non-evaporable active metal selected for the metal bracket has stronger ion bombardment resistance, when the ultraviolet lamp is in a normal working state, the sputtering effect of plasma in the lamp tube on the ultraviolet lamp is relatively weaker, the evaporation rate of atoms on the surface of a metal material can be effectively reduced, the surface of the metal bracket has stronger metal activity after being bombarded by the plasma for a long time, most of impurity gases except inert working gas can be absorbed, and the ultraviolet lamp can be in a stable working state for a long time. Therefore, the service performance and the service life of the ultraviolet lamp provided by the application can be obviously improved, and the ultraviolet lamp is applied to the photo-ion gas sensor such as the PID sensor, thereby being beneficial to improving the performance and the service life of the gas sensor.
The glass lamp 1 is usually made of lead-free glass, such as a quartz glass shell, and the shape of the glass lamp can be set according to needs, in a preferred example, the glass lamp 1 comprises a first cavity 11 and a second cavity 12 which are connected with each other, the non-connecting surface of the first cavity 11 and the second cavity 12 is the end surface of the glass lamp 1, one end surface 13 is a surface which is in sealing connection with the end surface 21 of the ultraviolet light output window 2, the other end surface 14 is close to the tail tip 16 of the ultraviolet light, when the ultraviolet light is assembled, the elasticity of the metal bracket 3 can be utilized, the metal bracket 3 can be pushed into the first cavity 11 sealed with the ultraviolet light output window 2 from one side of the end surface 14 by using a tool, after entering the first cavity 11, the first bifurcation 32 and the second bifurcation 33 are automatically sprung out, and cannot slide out of the second cavity 12 any more, and the huge risk of equipment damage caused by the metal bracket 3 falling into an exhaust table is avoided. Preferably, the first cavity 11 and the second cavity 12 are integrally formed and connected, for example, the first cavity 11 and the second cavity 12 can be formed by die machining, the inner diameter of the first cavity 11 is larger than the inner diameter of the second cavity 12, the ultraviolet light output window 2 is connected with one end of the first cavity 11 facing away from the second cavity 12, the metal bracket 3 is positioned in the first cavity 11, and the first bifurcation 32 and the second bifurcation 33 extend to be adjacent to the connecting surface of the first cavity 11 and the second cavity 12; in a further example, the first cavity 11 and the second cavity 12 are cylindrical and tubular, and the connection surface 15 of the first cavity 11 and the second cavity 12 is a conical surface, which facilitates smooth transition of the two cavities and improves the strength of the glass lamp tube. The material of the uv light output window 2 may be determined according to the output requirement, and in a preferred example, the material of the uv light output window 2 is magnesium fluoride crystal, which can be used to output uv light with ionization energy of 10.6 eV.
In one example, the glass tube 1 and the ultraviolet light output window 2 are sealingly connected by means of a sealing material, for example by means of a transparent UV glue. In other examples, an annular groove matched with the opening of the glass lamp tube 1 is formed on the ultraviolet light output window 2, the glass lamp tube is embedded in the annular groove to realize the sealing connection of the two, or the two modes are adopted simultaneously, namely the annular groove is formed simultaneously, and then the opening edge of the glass lamp tube is fixed in the annular groove through a sealing material such as UV glue to realize the reliable sealing of the two. In the preferred example, the uv light output window 2 is slightly larger in size than the face sealed to the glass tube 1, and thus appears as shown in fig. 1, the uv light output window 2 being formed with an outer rim (not shown) extending outwardly along the sealing face with the glass tube 1. The glass lamp tube is provided with a plurality of outer edge surfaces, and the outer edge surfaces are provided with a plurality of outer edge surfaces.
The material of the metal bracket 3 may be any material as long as it can satisfy the above-mentioned ion bombardment resistance, has a strong capability of absorbing impurity gas, and has a high secondary electron emission coefficient. In a preferred example, the metal bracket 3 may be made of one or two of vanadium and a vanadium alloy, but not limited thereto, and may be made of other noble metal materials, which is not strictly limited thereto. The number of the branches of the metal bracket 3 is not limited to two, but three or more branches can be provided, but 2 branches are arranged, so that the processing and the assembly are convenient, and meanwhile, the space in the glass lamp tube is prevented from being crowded.
An exemplary assembly process for the ultraviolet lamp provided in this embodiment is as follows:
1. the glass lamp tube 1 and the ultraviolet light output window 2 are mutually fixed through a sealing material 4;
2. pushing the metal bracket 3 into the glass lamp tube 1 from the tail end opening of the glass lamp tube 1 by using a tool, and referring to FIG. 3;
3. the glass lamp tube 1 is filled with working gas 5, the opening where the end face 14 is positioned is closed, a closed tail tip 16 is formed, and the assembled structure is shown in fig. 4.
Other structures, such as electrodes, of the ultraviolet lamp provided in this embodiment are substantially the same as those of the prior art, and are not developed in detail because the content of the portion is not the focus of the present application.
Example two
The main difference between the ultraviolet lamp provided in the present embodiment and the ultraviolet lamp provided in the first embodiment is that the metal bracket of the ultraviolet lamp in the first embodiment is only bifurcated on one side, and the other side is connected with each other to form a joint portion; in the ultraviolet lamp provided in this embodiment, the structure of the metal bracket 7 is shown in fig. 5, the metal bracket 7 not only has the first branch 72 and the second branch 73 connected with each other, but also includes the third branch 74 and the fourth branch 75 having elasticity, the first branch 72, the second branch 73, the third branch 74 and the fourth branch 75 are connected to form the joint portion 71, and the third branch 74 and the fourth branch 75 extend along the direction away from the first branch 72 and the second branch 73 until contacting the ultraviolet light output window 2, i.e. the metal bracket has an elastic structure with two ends split and combined in the middle, like an X-shape. The structure of the ultraviolet lamp provided in this embodiment is the same as that of the first embodiment except that the structure of the metal bracket is different from that of the first embodiment, and the installation method of the metal bracket is similar to that of the first embodiment, and the two ends of the metal bracket 7 are pushed into the first cavity 11 through the second cavity 12 after being split and compressed by using a tool, so that the two ends of the metal bracket are split again and cannot slide out of the second cavity 12.
The ultraviolet lamp provided in this embodiment also has all the advantages of the ultraviolet lamp of the first embodiment by adding the metal bracket in the glass lamp tube.
For further description of the ultraviolet lamp, reference is made to the foregoing, and details are omitted for brevity.
Example III
The present embodiment provides an ultraviolet lamp with another structure, where the ultraviolet lamp provided in this embodiment includes, in addition to the overall structure of the ultraviolet lamp in the first or second embodiment, an ultraviolet light attenuation sheet 6 made of a material that cannot transmit ultraviolet light (the specific material is not limited, as long as it is a material that is resistant to ultraviolet sputtering and does not transmit ultraviolet light, for example, a quartz material), and is located in the glass lamp tube 1 and adjacent to the ultraviolet light output window 2, the metal bracket is abutted against one end of the ultraviolet light attenuation sheet 6 facing away from the ultraviolet light output window 2, and a plurality of transmission holes 62 are provided on the ultraviolet light attenuation sheet 6, where the total transmission area of the plurality of transmission holes 62 is smaller than the transmission area of the ultraviolet light output window 2; the ultraviolet light attenuation sheet 6 is made of a material with zero ultraviolet light transmittance, and a small amount of ultraviolet light is allowed to transmit to the outside of the window through a small hole on the attenuation sheet in a punching mode, so that the aim of controlling the output light intensity of the ultraviolet lamp is fulfilled. The structure of the uv light attenuation sheet 6 may be shown in fig. 6, the shape of the uv light attenuation sheet is matched with the shapes of the glass lamp tube 1 and the uv light output window 2, for example, the uv light output window 2 is generally circular, so that the uv light attenuation sheet 6 is correspondingly a circular structure, a plurality of transmission holes 62 which can transmit uv light, for example, are formed on the circular surface, the outer diameter of the cylindrical surface 61 is generally slightly smaller than the inner diameter of the first cavity 11, so that the uv light attenuation sheet 6 can be assembled movably in the first cavity 11, and after the assembly, the uv light attenuation sheet 6 is always attached to the uv light output window 2 under the elastic support of a metal bracket (for example, the metal bracket in the second embodiment) to play a role of limiting the intensity of the output uv light. The ultraviolet lamp provided in this embodiment further adds an ultraviolet attenuation sheet with a transmission hole under the condition that the metal bracket is provided (thus, the ultraviolet lamp provided in this embodiment has all the advantages of the ultraviolet lamps in the first and second embodiments), and can set the required aperture and/or number of transmission holes according to the ultraviolet light intensity required to be output without adjusting the voltage, thereby solving the problem that the ultraviolet light intensity of the ultraviolet lamp is too high in certain application occasions, and being beneficial to further prolonging the service life of the ultraviolet lamp.
An exemplary assembly process for the ultraviolet lamp provided in this embodiment is as follows (based on the ultraviolet lamp provided in embodiment two):
1. placing the ultraviolet light attenuation sheet 6 into the first cavity 11 of the glass lamp tube 1;
2. sealing the glass lamp tube 1 with the ultraviolet light output window 2, and referring to FIG. 7;
3. the glass lamp tube assembly which is sealed by inversion is arranged so that the opening is upward, and the ultraviolet light attenuation sheet 6 is attached to the ultraviolet light output window 2 under the action of gravity;
4. pushing the metal bracket 7 into the first cavity 11 by a tool, opening the bifurcation, and always attaching the support ultraviolet light attenuation sheet 6 to the ultraviolet light output window 2 to play a role in limiting the intensity of the output ultraviolet light, as shown in reference to fig. 8;
5. the glass tube is filled with working gas 5 and the filling is closed, resulting in a closed tail tip 16, as shown with reference to fig. 9.
For further description of the ultraviolet lamp, reference is made to the foregoing, and details are omitted for brevity.
Example IV
The ultraviolet lamp of another structure is provided in this embodiment, and the ultraviolet lamp provided in this embodiment further includes an ultraviolet filter (not shown) in the glass lamp tube 1 and adjacent to the ultraviolet output window 2, where the metal bracket is abutted to one end of the ultraviolet filter, which is away from the ultraviolet output window, i.e. one surface of the ultraviolet filter is tightly attached to the ultraviolet output window, and the other surface is supported by the metal bracket and is in a relatively fixed state; the ultraviolet light transmission capacity of the ultraviolet light filter is smaller than that of the ultraviolet light output window, the ultraviolet light filter can have different transmission capacities on ultraviolet light according to the material characteristics of the ultraviolet light filter, and a part of ultraviolet light spectrum is filtered, so that the output spectrum of the ultraviolet lamp is changed. The ultraviolet filter may be made of different crystals, such as calcium fluoride crystal with an output ionization energy of 9.8eV, or aluminum oxide crystal with an output ionization energy of 9.6eV, or a combination of materials including the above materials, without limitation. In addition to all the advantages of the first and second embodiments, the ultraviolet lamp provided in this embodiment may further be provided with filters having different transmittance to ultraviolet light, so as to obtain ultraviolet lamps having different output ionization energies, thereby developing photoionization sensors having specific detection ranges.
For further description of the ultraviolet lamp, reference is made to the foregoing, and details are omitted for brevity.
Example five
The present embodiment provides an ultraviolet lamp with another structure, which has, in addition to the overall structure of the ultraviolet lamp described in the first or second embodiment, an ultraviolet light attenuation sheet described in the third embodiment and an ultraviolet light filter described in the fourth embodiment, wherein the ultraviolet light filter is located in the glass lamp tube, the ultraviolet light filter and the ultraviolet light attenuation sheet are adjacent to the ultraviolet light output window after being stacked, and the order of the ultraviolet light attenuation sheet and the ultraviolet light filter is not strictly limited, for example, the ultraviolet light filter may be adjacent to the ultraviolet light output window, and the ultraviolet light attenuation sheet is located at one end of the ultraviolet light filter away from the ultraviolet light output window, and the ultraviolet light transmission capability of the ultraviolet light filter is smaller than the ultraviolet light transmission capability of the ultraviolet light output window. The ultraviolet light filter and the ultraviolet light attenuation sheet can be stably fixed in the glass lamp tube under the support of the metal bracket. The ultraviolet light filter and the ultraviolet light attenuation sheet are additionally arranged at the same time, so that the ultraviolet light output intensity can be flexibly adjusted. For further description of the ultraviolet lamp, reference is made to the foregoing, and details are omitted for brevity.
The application also provides a gas sensor, which is a photo-ion sensor including but not limited to any one of a PID sensor and a GC sensor, and comprises the ultraviolet lamp described in any one of the above schemes, so the description of the ultraviolet lamp can be cited here in its entirety, and is not repeated for the sake of brevity. The gas sensor provided by the application has the advantages that the structure is not quite different from the prior art except the ultraviolet lamp provided by the application, and the structure is not developed in detail because the content is not the key point of the application. By adopting the ultraviolet lamp provided by the application, the performance and the service life of the gas sensor provided by the application can be obviously improved.
In summary, the present application provides an ultraviolet lamp, including a glass lamp tube, an ultraviolet light output window and a metal support made of non-evaporable active metal, where the ultraviolet light output window is connected with one end of the glass lamp tube in a sealing manner, the metal support is located in the glass lamp tube, the metal support includes a first bifurcation and a second bifurcation with elasticity, one ends of the first bifurcation and the second bifurcation are connected, and the other ends extend along a direction away from the ultraviolet light output window and are respectively in contact with different surfaces of the glass lamp tube. The application creatively adds the metal bracket with the bifurcation structure in the glass lamp tube, the shaped metal bracket can be put into the glass lamp tube from the opening at the tail part of the glass lamp tube in the manufacturing process of the ultraviolet lamp, after being put into the glass lamp tube, the bifurcation part can be automatically opened under the action of elastic force and is automatically fixed in the glass lamp tube, equipment damage caused by sliding out of the tail part of the lamp tube in the subsequent manufacturing process can be avoided, on one hand, the metal bracket can conduct a part of barrier charge generated by electrostatic action, so that working gas is broken down in advance under relatively lower external excitation voltage, the lighting voltage of the ultraviolet lamp can be reduced, namely the ultraviolet lamp is easier to light, and the power consumption is less; on the other hand, the metal bracket is made of a metal material with relatively high secondary electron emission coefficient, so that a large amount of electrons can overflow from the surface of the material under the action of an external electric field and micro electrons, the collision probability among molecules of working gas is greatly improved, the working gas is more easily excited, and the excitation voltage is further reduced; in addition, the non-evaporable active metal selected for the metal bracket has stronger ion bombardment resistance, when the ultraviolet lamp is in a normal working state, the sputtering effect of plasma in the lamp tube on the ultraviolet lamp is relatively weaker, the evaporation rate of atoms on the surface of a metal material can be effectively reduced, the surface of the metal bracket has stronger metal activity after being bombarded by the plasma for a long time, most of impurity gases except inert working gas can be absorbed, and the ultraviolet lamp can be in a stable working state for a long time. Therefore, the service performance and the service life of the ultraviolet lamp provided by the application can be obviously improved, and the ultraviolet lamp is applied to the photo-ion gas sensor such as the PID sensor, thereby being beneficial to improving the performance and the service life of the gas sensor. Therefore, the application effectively overcomes various defects in the prior art and has high industrial utilization value.
The above embodiments are merely illustrative of the principles of the present application and its effectiveness, and are not intended to limit the application. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the application. Accordingly, it is intended that all equivalent modifications and variations of the application be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.

Claims (10)

1. The ultraviolet lamp is characterized by comprising a glass lamp tube, an ultraviolet light output window and a metal support made of non-evaporable active metal, wherein the ultraviolet light output window is in sealing connection with one end of the glass lamp tube, the metal support is positioned in the glass lamp tube and comprises a first bifurcation and a second bifurcation which are elastic, one ends of the first bifurcation and the second bifurcation are connected, and the other ends of the first bifurcation and the second bifurcation extend along the direction deviating from the ultraviolet light output window and are respectively in contact with different surfaces of the glass lamp tube.
2. The ultraviolet lamp of claim 1, wherein the glass tube comprises a first cavity and a second cavity connected to each other, the first cavity has an inner diameter greater than an inner diameter of the second cavity, the ultraviolet light output window is connected to an end of the first cavity facing away from the second cavity, the metal bracket is located in the first cavity, and the first bifurcation and the second bifurcation extend to be adjacent to a connection surface of the first cavity and the second cavity.
3. The ultraviolet lamp of claim 2, wherein the connection surface of the first cavity and the second cavity is a conical surface, and the glass lamp tube and the ultraviolet light output window are hermetically connected by a sealing material.
4. The ultraviolet lamp of claim 1, wherein the metal support comprises one or both of vanadium and a vanadium alloy.
5. The ultraviolet lamp of claim 1, wherein the metal bracket further comprises a third prong and a fourth prong having elasticity, the first prong, the second prong, the third prong, and the fourth prong being connected, the third prong and the fourth prong extending in a direction away from the first prong and the second prong into contact with the ultraviolet light output window.
6. The ultraviolet lamp according to any one of claims 1 to 5, further comprising an ultraviolet light attenuation sheet made of a material incapable of transmitting ultraviolet light, wherein the ultraviolet light attenuation sheet is positioned in the glass lamp tube and adjacent to the ultraviolet light output window, the metal support is abutted to one end of the ultraviolet light attenuation sheet, which is away from the ultraviolet light output window, a plurality of transmission holes are formed in the ultraviolet light attenuation sheet, and the total transmission area of the plurality of transmission holes is smaller than the transmission area of the ultraviolet light output window.
7. The ultraviolet lamp of claim 1, further comprising an ultraviolet filter positioned within the glass tube and adjacent to the ultraviolet output window, wherein the metal bracket is abutted to an end of the ultraviolet filter facing away from the ultraviolet output window, and wherein the ultraviolet light transmission capacity of the ultraviolet filter is less than the ultraviolet light transmission capacity of the ultraviolet output window.
8. The ultraviolet lamp of claim 6, further comprising an ultraviolet filter positioned within the glass tube, the ultraviolet filter and the ultraviolet attenuation sheet being positioned adjacent to the ultraviolet output window after being stacked, the ultraviolet filter having an ultraviolet light transmission capacity less than an ultraviolet light transmission capacity of the ultraviolet output window.
9. The ultraviolet lamp of claim 8, wherein the ultraviolet light output window comprises magnesium fluoride crystals and the ultraviolet light filter comprises one or both of calcium fluoride crystals and aluminum oxide crystals.
10. A gas sensor comprising an ultraviolet lamp according to any one of claims 1-9.
CN202210173484.4A 2022-02-24 2022-02-24 Ultraviolet lamp and gas sensor Pending CN116705588A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210173484.4A CN116705588A (en) 2022-02-24 2022-02-24 Ultraviolet lamp and gas sensor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210173484.4A CN116705588A (en) 2022-02-24 2022-02-24 Ultraviolet lamp and gas sensor

Publications (1)

Publication Number Publication Date
CN116705588A true CN116705588A (en) 2023-09-05

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Family Applications (1)

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CN202210173484.4A Pending CN116705588A (en) 2022-02-24 2022-02-24 Ultraviolet lamp and gas sensor

Country Status (1)

Country Link
CN (1) CN116705588A (en)

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