CN217009120U - Ultraviolet lamp and gas sensor - Google Patents

Abstract

The utility model provides an ultraviolet lamp which comprises 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 hermetically connected with one end of the glass lamp tube, the metal support is positioned in the glass lamp tube, the metal support comprises a first branch and a second branch which are elastic, one end of the first branch is connected with one end of the second branch, the other end of the first branch extends along the direction departing from the ultraviolet light output window, and the first branch and the second branch are respectively contacted with different surfaces of the glass lamp tube. This application adds the metal support that has the bifurcation structure inside the glass lamp, can conduct partly because of the barrier charge that electrostatic action produced, make working gas broke down in advance under the outside excitation voltage lower relatively, promote the collision probability between the working gas molecule, gaseous is aroused more easily, reduce excitation voltage, can also absorb most impurity gas except that inert working gas, make the ultraviolet lamp be in stable operating condition for a long time, improve device performance and life.

Description

Ultraviolet lamp and gas sensor

Technical Field

The utility model 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) sensor is internally provided with a high voltage module for driving an ultraviolet lamp, the ultraviolet lamp and a detection module for detecting gas concentration, high voltage alternating current generated by the high voltage module is applied to a pair of metal electrodes outside a glass lamp tube of the ultraviolet lamp, an electric field formed between the metal electrodes applies energy to working gas inside the lamp tube to break down the working gas and emit ultraviolet rays, the ultraviolet rays pass through an output window on the ultraviolet lamp to ionize detected gas, and the ionized gas can be detected in a current mode when passing through the detection module and is converted to obtain the concentration value of the detected gas.

The vacuum ultraviolet lamp is mainly applied to light ion detection sensors such as PID (proportion integration differentiation), 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 of 1ppb with extremely low concentration to tens of thousands of ppm with higher concentration and other toxic and harmful gases. At present, the PID sensor is widely applied to detection of various organic chemicals, and plays an important role in detection of accident leakage in disaster areas, confirmation of accident areas, confirmation of leaked substances and the like. The performance and life of the vacuum ultraviolet lamp have been key factors in determining the quality of the PID sensor. Improving the performance and the life of the ultraviolet lamp are also the direction in which researchers of PID sensors continuously strive. 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 components around the ultraviolet lamp, but the ultraviolet lamp can not work normally and the adjustment amplitude is limited. In view of the above, the inventors of the present application have made a long-term study and have proposed an improvement.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned shortcomings of the prior art, the present invention is directed to an ultraviolet lamp and a gas sensor, which are used to solve the problems of the prior art, such as the failure of the ultraviolet lamp due to the possibility of the increase of the service life of the gas sensor, limited adjustment range, etc., caused by the change of the driving voltage of the ultraviolet lamp to change the output light intensity.

In order to achieve the above and other related objects, the present invention provides an ultraviolet lamp, which includes 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 hermetically connected to one end of the glass lamp tube, the metal support is located in the glass lamp tube, the metal support includes a first branch and a second branch having elasticity, one end of the first branch is connected to one end of the second branch, and the other end of the first branch extends in a direction away from the ultraviolet light output window and is in contact with different surfaces of the glass lamp tube.

Optionally, the glass lamp tube includes a first cavity and a second cavity connected to each other, the inner diameter of the first cavity is larger than that of the second cavity, the ultraviolet light output window is connected to an end of the first cavity away from the second cavity, the metal bracket is located in the first cavity, and the first branch and the second branch extend to be adjacent to a connecting surface of the first cavity and the second cavity.

Optionally, the connecting 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 metal stent comprises one or both of a vanadium stent and a vanadium alloy stent.

Optionally, the metal support further comprises a third branch and a fourth branch having elasticity, the first branch, the second branch, the third branch and the fourth branch are connected, and the third branch and the fourth branch extend to contact with the ultraviolet light output window along a direction departing from the first branch and the second branch.

Optionally, the ultraviolet lamp further comprises an ultraviolet attenuation sheet made of a material incapable of transmitting ultraviolet light, the ultraviolet attenuation sheet is located in the glass lamp tube and adjacent to the ultraviolet light output window, the metal support abuts against one end, deviating from the ultraviolet light output window, of the ultraviolet attenuation sheet, a plurality of transmission holes are formed in the ultraviolet attenuation sheet, and the total transmission area of the transmission holes is smaller than the light transmission area of the ultraviolet light output window.

In an alternative, 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, deviating from the ultraviolet light output window, of the ultraviolet light filter, and the 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 light filter positioned in the glass lamp tube, the ultraviolet light filter and the ultraviolet light attenuation sheet are stacked and then adjacent to the ultraviolet light output window, and the ultraviolet light transmission capacity of the ultraviolet light filter is smaller than that of the ultraviolet light output window.

Optionally, the uv light output window comprises a magnesium fluoride crystal window, and the uv light filter comprises one or both of a calcium fluoride crystal filter and an alumina crystal filter.

The utility model also provides a gas sensor comprising an ultraviolet lamp as described in any of the above aspects.

As described above, the ultraviolet lamp and the gas sensor according to the present invention have the following advantageous effects: the metal support with the branched structure is creatively added in the glass lamp tube, the metal support can be placed 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 support is placed in the glass lamp tube, the branched part can automatically open under the action of elastic force and is automatically fixed in the glass lamp tube, the metal support can be prevented from sliding out of the tail part of the lamp tube in the subsequent manufacturing process to damage equipment, on one hand, the metal support can conduct a part of barrier charges generated due to electrostatic action, so that working gas is broken down in advance under relatively low external excitation voltage, the lighting voltage of the ultraviolet lamp can be reduced, namely, the ultraviolet lamp is easier to be lit, and the power consumption is less; on the other hand, the metal bracket is made of a metal material with a relatively high secondary electron emission coefficient, so that a large number 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 working gas molecules is greatly improved, the working gas is easier to excite, and the excitation voltage is further reduced; in addition, the non-evaporable active metal selected by the metal support has stronger ion bombardment resistance, when the ultraviolet lamp is in a normal working state, the sputtering effect of the plasma in the lamp tube on the ultraviolet lamp is relatively weaker, the evaporation rate of atoms on the surface of the metal material can be effectively reduced, and after the metal support is bombarded by the plasma for a long time, the surface of the metal support has stronger metal activity, can absorb most of impurity gases except inert working gases, and can enable the ultraviolet lamp to be in a stable working state for a long time. Therefore, the ultraviolet lamp provided by the utility model has the advantages that the service performance and the service life can be obviously improved, and the ultraviolet lamp is applied to the photo-ion gas sensor such as the PID sensor, and is beneficial to improving the performance and the service life of the gas sensor.

Drawings

Fig. 1 is a schematic structural view of a glass lamp tube of an ultraviolet lamp according to an embodiment of the present invention.

Fig. 2 is a schematic structural view of a metal support of an ultraviolet lamp according to an embodiment of the present invention.

Fig. 3 and 4 are schematic views illustrating an assembly process of a uv lamp according to an embodiment of the present invention.

Fig. 5 is a schematic structural view of a metal support of an ultraviolet lamp according to a second embodiment of the present invention.

Fig. 6 is a schematic structural view of an ultraviolet light attenuating sheet of an ultraviolet lamp according to a third embodiment of the present invention.

Fig. 7 to 9 are schematic views illustrating an assembly process of an ultraviolet lamp according to a third embodiment of the present invention.

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The utility model is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. As in the detailed description of the embodiments of the present invention, the cross-sectional views illustrating the device structure are not partially enlarged in general scale for convenience of illustration, and the schematic views are only examples, which should not limit the scope of the present invention. In addition, the three-dimensional dimensions of length, width and depth should be included in the actual fabrication.

For convenience in description, spatial relational terms such as "below," "beneath," "below," "under," "over," "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 terms of spatial relationship are intended to encompass other orientations of the device in use or operation in addition to the orientation depicted in the figures. Further, 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 this application, a structure described as having a first feature "on" a second feature may include embodiments in which the first and second features are formed in direct contact, and may also include embodiments in which additional features are formed in 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 drawings provided in this embodiment are only for schematically illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings and not drawn according to the number, shape and size of the components in actual implementation, and the form, quantity and proportion of each component in actual implementation may be arbitrarily changed, and the component layout may be more complicated. In order to keep the drawings as concise as possible, not all features of a single figure may be labeled in their entirety.

Please refer to fig. 1 to 9.

Example one

As shown in fig. 1 to 4, the present invention provides an ultraviolet lamp, which includes a glass lamp tube 1, an ultraviolet light output window 2 and a metal support 3 made of non-evaporable active metal, wherein the ultraviolet light output window 2 is hermetically connected to one end of the glass lamp tube 1 (or the ultraviolet light output window 2 can be described as closing an opening of the glass lamp tube 1) to form a vacuum enclosed space, and the enclosed space is usually filled with an inert gas as a working gas 5, and by selecting different working gases, ultraviolet light radiation with different energy values can be excited, so that the ultraviolet lamp can be used for ionizing and detecting different kinds of gases; the metal support 3 is located in the glass lamp tube 1, the metal support 3 includes a first branch 32 and a second branch 33 having elasticity, one end of the first branch 32 and one end of the second branch 33 are connected to form a combination portion 31, the combination portion 31 can be contacted with the ultraviolet light output window 2, or abutted against the ultraviolet light output window 2, the other ends of the first branch 32 and the second branch 33 extend along a direction departing from the ultraviolet light output window 2 and are respectively contacted with different surfaces of the glass lamp tube 1, preferably, the first branch 32 and the second branch 33 are distributed with an axial center line of the glass lamp tube 1; the first branch 32 and the second branch 33 can be folded under the action of external force due to elasticity, and the external force is released and then returns to the original shape of the branches. The ultraviolet lamp is characterized in that a metal support is not arranged in the existing ultraviolet lamp, and the excitation voltage of the ultraviolet lamp is relatively high because when the stepless 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 the electrostatic action, and the barrier charges can form a reverse high-voltage electric field inside the lamp tube to break down working gas so as to enable the lamp bulb to emit light; the inventor of the application creatively adds the metal bracket with the branched structure in the glass lamp tube through a large amount of creative labor, the shaped metal bracket can be placed 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 placed, the branched part can automatically open under the action of elastic force and is automatically fixed in the glass lamp tube, the metal bracket can prevent the metal bracket from sliding out of the tail part of the lamp tube in the subsequent manufacturing process to damage equipment, on one hand, the metal bracket can conduct part of barrier charges generated due to electrostatic action, so that the working gas is broken down in advance under relatively low external excitation voltage, the lighting voltage of the ultraviolet lamp can be reduced, namely, the ultraviolet lamp is more easily lighted, and the power consumption is less; on the other hand, the metal bracket is made of a metal material with a relatively high secondary electron emission coefficient, so that a large number 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 working gas molecules is greatly improved, the working gas is easier to excite, and the excitation voltage is further reduced; in addition, the non-evaporable active metal selected for the metal support has stronger ion bombardment resistance, when the ultraviolet lamp is in a normal working state, the plasma in the lamp tube has relatively weaker sputtering effect on the ultraviolet lamp, so that the evaporation rate of atoms on the surface of the metal material can be effectively reduced, and after the metal support is bombarded by the plasma for a long time, the surface of the metal support has stronger metal activity, so that 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 ultraviolet lamp provided by the utility model has the advantages that the service performance and the service life can be obviously improved, and the ultraviolet lamp is applied to the photo-ion gas sensor such as the PID sensor, and is beneficial to improving the performance and the service life of the gas sensor.

The glass lamp vessel 1 is usually made of lead-free glass, for example, a quartz glass envelope, which can be shaped as desired, in a preferred example, the glass lamp tube 1 comprises a first cavity 11 and a second cavity 12 connected with each other, the non-connection surface of the first cavity 11 and the second cavity 12 is the end surface of the glass lamp tube 1, one end face 13 is a face which is in sealing connection with the end face 21 of the ultraviolet light output window 2, the other end face 14 is close to the tail tip 16 of the ultraviolet lamp, when assembling the ultraviolet lamp, the metal holder 3 can be assembled from the end face 14 side by using a tool by utilizing the elasticity of the metal holder 3 itself, pushed into the first cavity 11 sealed with the ultraviolet light output window 2 through the second cavity 12, and enters the first cavity 11, the first branch 32 and the second branch 33 are automatically flicked and can not slide out of the second cavity 12, so that the huge risk of equipment damage caused by the fact that the metal bracket 3 falls into the exhaust table is avoided. Preferably, the first cavity 11 and the second cavity 12 are integrally formed and connected, for example, they may be formed by a mold, the inner diameter of the first cavity 11 is greater than the inner diameter of the second cavity 12, the ultraviolet light output window 2 is connected to one end of the first cavity 11 away from the second cavity 12, the metal bracket 3 is located in the first cavity 11, and the first branch 32 and the second branch 33 extend to be adjacent to the connection 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 output window 2 may be determined according to the output requirement, in a preferred example, the material of the uv 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 lamp vessel 1 and the UV output window 2 are sealingly connected by a sealing material, for example by means of a transparent UV glue. In other examples, an annular groove matching with the opening of the glass lamp tube 1 may be formed on the ultraviolet light output window 2, and the glass lamp tube is embedded in the annular groove to achieve the sealing connection therebetween, or the two methods are simultaneously adopted, that is, the annular groove is formed simultaneously, and then the edge of the opening of the glass lamp tube is fixed in the annular groove by using a sealing material such as UV glue to achieve the reliable sealing therebetween. In a preferred example, the size of the uv light output window 2 is slightly larger than the surface sealed with the glass lamp tube 1, so that it appears as shown in fig. 1 that the uv light output window 2 is formed with an outer edge surface (not labeled) extending outward along the sealing surface with the glass lamp tube 1. The glass lamp tube can be fully sealed, and the extended outer edge surface can also play a role in protecting the glass lamp tube from external impact to a certain extent.

The material of the metal support 3 may be determined as required, and any metal material having a high secondary electron emission coefficient may be used in the present invention as long as it satisfies the above-mentioned ion bombardment resistance, has a high ability to absorb impurity gases, and is suitable for the present invention. In a preferred example, the material of the metal bracket 3 may be one or two of vanadium and vanadium alloy, that is, the metal bracket may be one or two of vanadium bracket or vanadium alloy bracket (the same metal bracket is preferably made of the same material), but not limited thereto, and other noble metal brackets may also be used, and the material is not limited thereto. The number of the branches of the metal bracket 3 is not limited to two, but may be three or more, but the arrangement of 2 branches is not only convenient for processing and assembling, but also can avoid the space crowding in the glass lamp tube.

An exemplary assembly process for the uv lamp provided in this example is as follows:

1. fixing the glass lamp tube 1 and the ultraviolet light output window 2 with each other through a sealing material 4;

2. using a tool to push the metal bracket 3 into the glass lamp tube 1 from the opening at the tail end of the glass lamp tube 1, as shown in fig. 3;

3. the glass lamp tube 1 is filled with working gas 5, and the opening where the end face 14 is located is closed to form a closed tail tip 16, so that the assembly is completed, and the structure after the assembly is shown in fig. 4.

Other structures, such as electrodes, not mentioned in the ultraviolet lamp provided in this embodiment are substantially the same as those in the prior art, and since this part is not the focus of the present invention, this will not be developed in detail.

Example two

The present embodiment provides an ultraviolet lamp with another structure, and the main difference between the ultraviolet lamp provided in the present embodiment and the ultraviolet lamp provided in the first embodiment is that, in the ultraviolet lamp in the first embodiment, only one side of the metal support is bifurcated, and the other sides are connected to each other to form a combination portion; in the ultraviolet lamp provided in this embodiment, the structure of the metal support 7 is shown in fig. 5, the metal support 7 not only has a first branch 72 and a second branch 73 connected to each other, but also includes a third branch 74 and a fourth branch 75 with elasticity, the first branch 72, the second branch 73, the third branch 74 and the fourth branch 75 are connected to form a joint portion 71, and the third branch 74 and the fourth branch 75 extend in a direction away from the first branch 72 and the second branch 73 to contact with the ultraviolet light output window 2, that is, the metal support is an elastic structure with two branches and middle joint, and is similar to an X shape. The ultraviolet lamp provided by the embodiment has the same structure except that the structure of the metal support is different from that of the metal support in the first embodiment, the installation method of the metal support is similar to that of the first embodiment, the two ends of the metal support 7 are forked and compressed by using a tool and then pushed into the first cavity 11 through the second cavity 12, and the two ends of the metal support are forked and rebound again, so that the metal support cannot slide out of the second cavity 12.

The ultraviolet lamp provided by the embodiment also has all the advantages of the ultraviolet lamp provided by the first embodiment by additionally arranging the metal bracket in the glass lamp tube.

For further description of the ultraviolet lamp, please refer to the foregoing, and further description is omitted for brevity.

EXAMPLE III

An ultraviolet lamp with another structure is provided in this embodiment, the ultraviolet lamp provided in this embodiment includes, in addition to all the structures of the ultraviolet lamp in the first or second embodiment, an ultraviolet attenuation sheet 6 (specific material is not limited, any material may be used as long as it is resistant to ultraviolet sputtering and does not transmit ultraviolet light, for example, quartz material) made of a material that cannot transmit ultraviolet light, the ultraviolet attenuation sheet is located in the glass lamp tube 1 and adjacent to the ultraviolet light output window 2, the metal support abuts against one end of the ultraviolet attenuation sheet 6, which is away from the ultraviolet light output window 2, a plurality of transmission holes 62 are provided on the ultraviolet attenuation sheet 6, and 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 attenuation sheet 6 is made of a material with zero ultraviolet transmittance, and allows a trace amount of ultraviolet rays to be transmitted to the outside of the window through the small holes in the attenuation sheet in a punching mode, so that the purpose of controlling the output light intensity of the ultraviolet lamp is achieved. The structure of the ultraviolet light attenuation sheet 6 can be referred to as fig. 6, and the shape of the ultraviolet light attenuation sheet 6 is matched with the shapes of the glass lamp tube 1 and the ultraviolet light output window 2, for example, the ultraviolet light output window 2 is generally circular, so the ultraviolet light attenuation sheet 6 is correspondingly of a disc-shaped structure, a plurality of transmission holes 62 which can transmit ultraviolet light, for example, circular, are processed 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 ultraviolet light attenuation sheet can be assembled in the first cavity 11 in a movable manner, and after the assembly is completed, the ultraviolet light attenuation sheet 6 is always attached to the ultraviolet light output window 2 under the elastic support of a metal support (for example, the metal support in the second embodiment), so as to limit the intensity of the output ultraviolet light. The ultraviolet lamp provided by the embodiment is further additionally provided with the ultraviolet light attenuation sheet with the transmission holes under the condition that the metal support is arranged (so that the ultraviolet lamp provided by the embodiment has all the advantages of the ultraviolet lamps of the first embodiment and the second embodiment), and the transmission holes with the required apertures and/or the required number can be arranged according to the light intensity of the ultraviolet light required to be output under the condition that the voltage does not need to be adjusted, so that the problem that the light intensity of the ultraviolet light of the ultraviolet lamp in certain application occasions is too high is solved, and the service life of the ultraviolet lamp is further prolonged.

An exemplary assembly process for the uv lamp provided in this example is as follows (based on the uv lamp provided in example two):

1. placing the ultraviolet light attenuation sheet 6 into a first cavity 11 of the glass lamp tube 1;

2. sealing the glass lamp tube 1 with the ultraviolet light output window 2, as shown in reference to fig. 7;

3. inverting the sealed glass lamp tube assembly to make the opening upward, and attaching the ultraviolet light attenuation sheet 6 to the ultraviolet light output window 2 under the action of gravity;

4. a metal bracket 7 is pushed into the first cavity 11 by a tool, the fork is opened, and the ultraviolet attenuation sheet 6 is supported to be always attached to the ultraviolet output window 2, so as to play a role in limiting the light intensity of the output ultraviolet light, which is shown in reference to fig. 8;

5. the glass lamp tube is filled with the working gas 5 and the filling opening 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 description, and details are not repeated for the sake of brevity.

Example four

The present embodiment provides an ultraviolet lamp with another structure, and the ultraviolet lamp provided in this embodiment includes, in addition to all the structures of the ultraviolet lamp in the first or second embodiment, an ultraviolet light filter (not shown) located in the glass lamp tube 1 and adjacent to the ultraviolet light output window 2, and the metal support abuts against one end of the ultraviolet light filter departing from the ultraviolet light output window, that is, one surface of the ultraviolet light filter is tightly attached to the ultraviolet light output window, and the other surface is supported by the metal support and is in a relatively fixed state; the ultraviolet light filter has different ultraviolet light transmission capacities according to the characteristics of materials of the ultraviolet light filter, and filters a part of ultraviolet light spectrum, so that the output spectrum of the ultraviolet light is changed. The material of the ultraviolet light filter may be different crystal filters according to the requirement, for example, a calcium fluoride crystal filter may be selected, and the output ionization energy is 9.8eV, or an aluminum oxide crystal filter may be selected, and the output ionization energy is 9.6eV, or a combination of various filters including the above materials, which is not limited strictly. In addition to all the advantages of the first and second embodiments, the ultraviolet lamp provided in this embodiment may be configured with filters having different transmission capabilities for ultraviolet light, so as to obtain ultraviolet lamps having different output ionization energies, thereby developing a photoionization sensor having a specific detection range.

For further description of the ultraviolet lamp, please refer to the foregoing, and further description is omitted for brevity.

EXAMPLE five

This embodiment provides an ultraviolet lamp having another structure, which includes, in addition to all the structures of the ultraviolet lamp described in the first or second embodiment, an ultraviolet light attenuating sheet described in the third embodiment and an ultraviolet light filter described in the fourth embodiment, where the ultraviolet light filter is located in the glass lamp tube, the ultraviolet light filter and the ultraviolet light attenuating sheet are stacked and then adjacent to the ultraviolet light output window, and the front and rear order of the ultraviolet light attenuating sheet and the ultraviolet light filter is not strictly limited, for example, the ultraviolet light filter and the ultraviolet light output window may be adjacent to each other, and the ultraviolet light attenuating sheet is located at an end of the ultraviolet light filter away from the ultraviolet light output window, and the ultraviolet light transmittance of the ultraviolet light filter is smaller than the ultraviolet light transmittance of the ultraviolet light output window. Under the support of the metal support, the ultraviolet light filter and the ultraviolet light attenuation sheet can be stably fixed in the glass lamp tube. By adding the ultraviolet light filter and the ultraviolet light attenuation sheet at the same time, the output light intensity of the ultraviolet light can be adjusted more flexibly. For further description of the ultraviolet lamp, reference is made to the foregoing description, and details are not repeated for the sake of brevity.

The utility model further provides a gas sensor, wherein the gas sensor is a photo-ion sensor, and includes but is not limited to any one of a PID sensor and a GC sensor, and the gas sensor includes the ultraviolet lamp according to any one of the above schemes, so that the description of the ultraviolet lamp can be incorporated herein in its entirety, and is not repeated for brevity. Except for using the ultraviolet lamp provided by the utility model, other structures of the gas sensor provided by the utility model are not much different from the prior art, and because the content of the part is not the key point of the utility model, the detail development is not carried out. Due to the adoption of the ultraviolet lamp provided by the utility model, the performance and the service life of the gas sensor provided by the utility model can be obviously improved.

In summary, the present invention provides an ultraviolet lamp, which includes 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 hermetically connected to one end of the glass lamp tube, the metal support is located in the glass lamp tube, the metal support includes a first branch and a second branch having elasticity, one end of the first branch is connected to one end of the second branch, and the other end of the first branch extends in a direction away from the ultraviolet light output window, and the first branch and the second branch are respectively in contact with different surfaces of the glass lamp tube. The metal support with the branched structure is creatively added in the glass lamp tube, the metal support can be placed 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 support is placed in the glass lamp tube, the branched part can automatically open under the action of elastic force and is automatically fixed in the glass lamp tube, the metal support can be prevented from sliding out of the tail part of the lamp tube in the subsequent manufacturing process to damage equipment, on one hand, the metal support can conduct a part of barrier charges generated due to electrostatic action, so that working gas is broken down in advance under relatively low external excitation voltage, the lighting voltage of the ultraviolet lamp can be reduced, namely, the ultraviolet lamp is easier to be lit, and the power consumption is less; on the other hand, the metal bracket is made of a metal material with a relatively high secondary electron emission coefficient, so that a large number 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 working gas molecules is greatly improved, the working gas is easier to excite, and the excitation voltage is further reduced; in addition, the non-evaporable active metal selected by the metal support has stronger ion bombardment resistance, when the ultraviolet lamp is in a normal working state, the sputtering effect of the plasma in the lamp tube on the ultraviolet lamp is relatively weaker, the evaporation rate of atoms on the surface of the metal material can be effectively reduced, and after the metal support is bombarded by the plasma for a long time, the surface of the metal support has stronger metal activity, can absorb most of impurity gases except inert working gases, and can enable the ultraviolet lamp to be in a stable working state for a long time. Therefore, the ultraviolet lamp provided by the utility model can obviously improve the service performance and the service life, and is applied to the photo-ion gas sensor such as a PID sensor, and the like, thereby being beneficial to improving the performance and the service life of the gas sensor. Therefore, the utility model effectively overcomes various defects in the prior art and has high industrial utilization value.

The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the utility model. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

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 connected with one end of the glass lamp tube in a sealing manner, the metal support is positioned in the glass lamp tube, the metal support comprises a first fork and a second fork which are elastic, one end of the first fork is connected with one end of the second fork, the other end of the first fork extends in the direction departing from the ultraviolet light output window, and the first fork and the second fork are respectively in contact with different surfaces of the glass lamp tube.

2. The uv lamp according to claim 1, wherein the glass tube comprises a first cavity and a second cavity connected to each other, the first cavity having an inner diameter greater than an inner diameter of the second cavity, the uv light output window being connected to an end of the first cavity facing away from the second cavity, the metal support being located within the first cavity, and the first and second prongs extending adjacent to a connecting surface of the first and second cavities.

3. The uv lamp according to claim 2, wherein the junction surface of the first chamber and the second chamber is a conical surface, and the glass tube and the uv output window are hermetically sealed by a sealing material.

4. The uv lamp according to claim 1, wherein the metal support comprises one or both of a vanadium support and a vanadium alloy support.

5. The uv lamp according to claim 1, wherein the metal support further comprises resilient third and fourth prongs connected to each other, the third and fourth prongs extending away from the first and second prongs into contact with the uv light output window.

6. The ultraviolet lamp according to any one of claims 1 to 5, further comprising an ultraviolet light attenuating sheet made of a material incapable of transmitting ultraviolet light, the ultraviolet light attenuating sheet being located inside the glass lamp tube and adjacent to the ultraviolet light output window, the metal support abutting against an end of the ultraviolet light attenuating sheet facing away from the ultraviolet light output window, the ultraviolet light attenuating sheet being provided with a plurality of transmission holes, a total transmission area of the plurality of transmission holes being smaller than a light transmission area of the ultraviolet light output window.

7. The uv lamp according to claim 1, further comprising an uv filter positioned within the glass tube adjacent to the uv output window, wherein the metal support abuts an end of the uv filter facing away from the uv output window, and wherein the uv filter has a uv transmission capacity less than the uv transmission capacity of the uv output window.

8. The UV lamp of claim 6, further comprising an UV filter positioned within said glass tube, said UV filter and UV attenuator being positioned adjacent said UV output window after lamination, said UV filter having a UV transmission capability less than that of said UV output window.

9. The ultraviolet lamp of claim 8, wherein the ultraviolet light output window comprises a magnesium fluoride crystal window and the ultraviolet light filter comprises one or both of a calcium fluoride crystal filter and an alumina crystal filter.

10. A gas sensor comprising an ultraviolet lamp according to any one of claims 1 to 9.

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